SCRUBBER

Abstract

A scrubber includes: a drive assembly that includes a motor that rotates about a motor rotation axis extending in an up-and-down direction; a tool that faces a cleaning target and is rotated by the motor; a guard portion having at least a part disposed around the tool; and an attaching/detaching mechanism that includes a hook member and attaches and detaches the drive assembly and the guard portion to and from each other.

Claims

1. A scrubber comprising: a drive assembly that includes a motor that rotates about a motor rotation axis extending in an up-down direction; a tool that faces a cleaning target and is rotated by the motor; a guard portion that is disposed at least partially around the tool; and an attaching/detaching mechanism that includes a hook member and is configured to attach and detach the drive assembly and the guard portion to and from each other.

2. The scrubber according to claim 1, wherein the attaching/detaching mechanism is provided on one or both of the drive assembly and the guard portion.

3. The scrubber according to claim 2, wherein the hook member is movably supported by the drive assembly.

4. The scrubber according to claim 3, wherein the hook member includes: a first hook member; and a second hook member that is connected to at least a part of the first hook member and moves in synchronization with the first hook member.

5. The scrubber according to claim 4, wherein the first hook member includes: a main body portion disposed around a rotation shaft that connects the motor with the tool; and a first hook portion that is disposed below a front portion of the main body portion and hooked on the guard portion.

6. The scrubber according to claim 5, wherein the first hook member includes an operation button portion that is provided on the front portion of the main body portion and that protrudes forward from a head housing of the drive assembly.

7. The scrubber according to claim 5, wherein the first hook member includes a connecting hole which is provided in a rear portion of the main body portion and into which at least a part of the second hook member is inserted.

8. The scrubber according to claim 7, wherein the second hook member includes: an insertion portion that is inserted into the connecting hole; and a second hook portion that is disposed below the insertion portion and that is hooked on the guard portion.

9. The scrubber according to claim 8, wherein the second hook member includes a pivoting portion disposed between the insertion portion and the second hook portion in the up-down direction.

10. The scrubber according to claim 9, Wherein, when viewed from above, an extension line of a pivot axis of the pivoting portion passes an upper surface of the second hook portion.

11. The scrubber according to claim 4, wherein the drive assembly includes a hook cover to be inserted into an opening provided in the guard portion, and the hook cover supports the first hook member and the second hook member.

12. The scrubber according to claim 11, wherein the hook cover includes: a cylindrical portion to be inserted into the opening; and a slide portion that is provided on an outer surface of the cylindrical portion and guided by a guide portion provided on the guard portion.

13. The scrubber according to claim 12, wherein the cylindrical portion include: a first hook hole in which a first hook portion of the first hook member is movably disposed; and a second hook hole in which a second hook portion of the second hook member is movably disposed.

14. The scrubber according to claim 3, wherein the attaching/detaching mechanism includes a biasing member that biases the hook member such that the hook member approaches the guard portion.

15. The scrubber according to claim 14, wherein the hook member includes: a first hook member; and a second hook member that is connected to at least a part of the first hook member and that moves in synchronization with the first hook member, the biasing member is disposed between the first hook member and at least a part of a hook cover that supports the first hook member to be movable, the biasing member biases the first hook member such that the first hook member approaches the guard portion; and the biasing member biases the second hook member via the first hook member such that the second hook member approaches the guard portion.

16. The scrubber according to claim 15, wherein the drive assembly includes a hook cover to be inserted into an opening provided in the guard portion, the hook cover supports the hook member to be movable, when the biasing member biases the first hook member and the second hook member with the hook cover being inserted into the opening, an engaged state is established in which a first hook portion of the first hook member and a second hook portion of the second hook member are hooked on the guard portion, and when an operation button portion provided on the first hook member is operated against biasing force of the biasing member, a released state is established in which the first hook portion and the second hook portion are separated from the guard portion.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0008] FIG. 1 illustrates a scrubber according to a first embodiment as viewed from the upper-right front;

[0009] FIG. 2 illustrates the scrubber according to the first embodiment as viewed from above;

[0010] FIG. 3 illustrates the scrubber according to the first embodiment as viewed from below;

[0011] FIG. 4 illustrates the scrubber according to the first embodiment as viewed from the right;

[0012] FIG. 5 illustrates the scrubber according to the first embodiment as viewed from the left;

[0013] FIG. 6 illustrates the scrubber according to the first embodiment as viewed from the front;

[0014] FIG. 7 illustrates the scrubber according to the first embodiment as viewed from the rear;

[0015] FIG. 8 is a cross-sectional view illustrating the scrubber according to the first embodiment;

[0016] FIG. 9 illustrates a main body assembly according to the first embodiment as viewed from above;

[0017] FIG. 10 illustrates the main body assembly according to the first embodiment as viewed from the right;

[0018] FIG. 11 illustrates the operation of a battery cover according to the first embodiment;

[0019] FIG. 12 illustrates a battery pack released from a battery mounting portion according to the first embodiment;

[0020] FIG. 13 illustrates an example of a method of temporarily placing the scrubber according to the first embodiment;

[0021] FIG. 14 illustrates the example of the method of temporarily placing the scrubber according to the first embodiment;

[0022] FIG. 15 illustrates the example of the method of temporarily placing the scrubber according to the first embodiment;

[0023] FIG. 16 illustrates the front portion of the scrubber according to the first embodiment as viewed from the upper-right front;

[0024] FIG. 17 is a cross-sectional view illustrating the front portion of the scrubber according to the first embodiment;

[0025] FIG. 18 is a cross-sectional view illustrating the front portion of the scrubber according to the first embodiment;

[0026] FIG. 19 is an exploded view illustrating the front portion of the scrubber according to the first embodiment as viewed from the upper-right front;

[0027] FIG. 20 illustrates a drive assembly according to the first embodiment as viewed from the upper-right front;

[0028] FIG. 21 illustrates the drive assembly according to the first embodiment as viewed from the upper-left rear;

[0029] FIG. 22 illustrates the drive assembly according to the first embodiment as viewed from the lower-right front;

[0030] FIG. 23 is an exploded view illustrating the drive assembly according to the first embodiment as viewed from the upper-right front;

[0031] FIG. 24 illustrates an adapter and a cover according to the first embodiment as viewed from the right;

[0032] FIG. 25 is a cross-sectional view illustrating the adapter and the cover according to the first embodiment;

[0033] FIG. 26 illustrates a tool according to the first embodiment as viewed from the upper-right front;

[0034] FIG. 27 is an exploded view illustrating the tool according to the first embodiment as viewed from the upper-right front;

[0035] FIG. 28 is a cross-sectional view illustrating the tool according to the first embodiment;

[0036] FIG. 29 illustrates the tool connected to the drive assembly according to the first embodiment as viewed from the upper-right front;

[0037] FIG. 30 illustrates the tool connected to the drive assembly according to the first embodiment as viewed from below;

[0038] FIG. 31 illustrates the drive assembly and the guard portion according to the first embodiment as viewed from the upper-right front;

[0039] FIG. 32 illustrates the guard portion according to the first embodiment as viewed from the upper-right front;

[0040] FIG. 33 illustrates the guard portion according to the first embodiment as viewed from the right;

[0041] FIG. 34 illustrates the guard portion according to the first embodiment as viewed from the front;

[0042] FIG. 35 is a cross-sectional view illustrating the guard portion according to the first embodiment;

[0043] FIG. 36 is an exploded view illustrating the guard portion according to the first embodiment as viewed from the upper-right front;

[0044] FIG. 37 illustrates an attaching/detaching mechanism according to the first embodiment as viewed from the upper-left front;

[0045] FIG. 38 illustrates the attaching/detaching mechanism according to the first embodiment as viewed from the upper-right rear;

[0046] FIG. 39 illustrates the attaching/detaching mechanism according to the first embodiment as viewed from above;

[0047] FIG. 40 is a cross-sectional view illustrating the attaching/detaching mechanism according to the first embodiment;

[0048] FIG. 41 is an exploded view illustrating the attaching/detaching mechanism according to the first embodiment as viewed from the upper-left front;

[0049] FIG. 42 is an exploded view illustrating the attaching/detaching mechanism according to the first embodiment as viewed from the upper-right rear;

[0050] FIG. 43 illustrates a second hook member according to the first embodiment as viewed from above;

[0051] FIG. 44 illustrates the attaching/detaching mechanism according to the first embodiment as viewed from the upper-left front;

[0052] FIG. 45 illustrates the attaching/detaching mechanism according to the first embodiment as viewed from the upper-right rear;

[0053] FIG. 46 illustrates the attaching/detaching mechanism according to the first embodiment as viewed from above;

[0054] FIG. 47 is a cross-sectional view illustrating the attaching/detaching mechanism according to the first embodiment;

[0055] FIG. 48 is an exploded view illustrating an adjustment mechanism according to the first embodiment as viewed from the upper-right front;

[0056] FIG. 49 illustrates the front portion of the scrubber according to the first embodiment as viewed from the upper-right front;

[0057] FIG. 50 illustrates guard portion having heights adjusted by the adjustment mechanism according to the first embodiment;

[0058] FIG. 51 illustrates an attaching/detaching mechanism according to a second embodiment as viewed from the upper-left front;

[0059] FIG. 52 illustrates the attaching/detaching mechanism according to the second embodiment as viewed from the upper-right rear;

[0060] FIG. 53 illustrates the attaching/detaching mechanism according to the second embodiment as viewed from above;

[0061] FIG. 54 illustrates the attaching/detaching mechanism in an engaged state and a released state according to the second embodiment as viewed from above;

[0062] FIG. 55 illustrates the attaching/detaching mechanism in the engaged state and the released state according to the second embodiment as viewed from the right;

[0063] FIG. 56 illustrates an attaching/detaching mechanism according to a third embodiment as viewed from the upper-left front;

[0064] FIG. 57 illustrates the attaching/detaching mechanism according to the third embodiment as viewed from the upper-right rear;

[0065] FIG. 58 illustrates the attaching/detaching mechanism according to the third embodiment as viewed from above;

[0066] FIG. 59 illustrates the attaching/detaching mechanism in an engaged state and a released state according to the third embodiment as viewed from above;

[0067] FIG. 60 illustrates the attaching/detaching mechanism in the engaged state and the released state according to the third embodiment as viewed from the right;

[0068] FIG. 61 illustrates an adjustment mechanism according to a fourth embodiment as viewed from the upper-right front;

[0069] FIG. 62 is an exploded view illustrating the adjustment mechanism according to the fourth embodiment as viewed from the upper-right front;

[0070] FIG. 63 is an exploded view illustrating the adjustment mechanism according to the fourth embodiment as viewed from the upper-right front;

[0071] FIG. 64 illustrates the adjustment mechanism according to the fourth embodiment as viewed from the upper-right front;

[0072] FIG. 65 illustrates a guard portion having a height adjusted by the adjustment mechanism according to the fourth embodiment;

[0073] FIG. 66 illustrates an adjustment mechanism according to a fifth embodiment as viewed from the upper-right front;

[0074] FIG. 67 is an exploded view illustrating the adjustment mechanism according to the fifth embodiment as viewed from the upper-right front;

[0075] FIG. 68 is an exploded view illustrating the adjustment mechanism according to the fifth embodiment as viewed from the upper-right front; and

[0076] FIG. 69 illustrates a guard portion having a height adjusted by the adjustment mechanism according to the fifth embodiment.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

[0077] In one or more embodiments, a scrubber may include: a drive assembly that includes a motor that rotates about a motor rotation axis extending in the up-down direction; a tool that faces a cleaning target and is rotated by the motor; a guard portion that is disposed at least partially around the tool; and an attaching/detaching mechanism that includes a hook member and is configured to attach and detach the drive assembly and the guard portion to and from each other.

[0078] In the above-described configuration, the guard portion of the scrubber can be smoothly attached and detached by the attaching/detaching mechanism including the hook member.

[0079] In one or more embodiments, the attaching/detaching mechanism may be provided on one or both of the drive assembly and the guard portion.

[0080] In the above-described configuration, the attaching/detaching mechanism is provided on one or both of the drive assembly and the guard portion, which inhibits an increase in size of the scrubber.

[0081] In one or more embodiments, the hook member may be movably supported by the drive assembly.

[0082] In the above-described configuration, the guard portion of the scrubber can be smoothly attached and detached by the hook member movably supported by the drive assembly.

[0083] In one or more embodiments, the hook member may include: a first hook member; and a second hook member that is connected to at least a part of the first hook member and that moves in synchronization with the first hook member.

[0084] In the above-described configuration, the second hook member moves in synchronization with the first hook member by operating the first hook member, so that the guard portion of the scrubber can be attached and detached with good operability.

[0085] In one or more embodiments, the first hook member may include: a main body portion disposed around a rotation shaft that connects the motor with the tool; and first hook portion disposed below the front portion of the main body portion and hooked on the guard portion.

[0086] In the above-described configuration, the main body portion is disposed around the rotation shaft, which inhibits an increase in size of the attaching/detaching mechanism. The guard portion of the scrubber can be smoothly attached and detached by the first hook member.

[0087] In one or more embodiments, the first hook member may include an operation button portion that is provided on the front portion of the main body portion and that protrudes forward from a head housing of the drive assembly.

[0088] In the above-described configuration, the guard portion of scrubber can be easily attached and detached only by operating the operation button portion.

[0089] In one or more embodiments, the first hook member may have a connecting hole which is provided at the rear portion of the main body portion and into which at least a part of the second hook member is inserted.

[0090] In the above-described configuration, the first hook member and the second hook member are connected via the connecting holes.

[0091] In one or more embodiments, the second hook member may include: the insertion portion that is inserted into the connecting hole; and the second hook portion that is disposed below the insertion portion and is hooked on the guard portion.

[0092] In the above-described configuration, the first hook member and the second hook member are connected via the connecting hole and the insertion portion to be inserted into the connecting hole. The guard portion of the scrubber can be smoothly attached and detached by the second hook member.

[0093] In one or more embodiments, the second hook member may include a pivoting portion disposed between the insertion portion and the second hook portion in the up-down direction.

[0094] In the above-described configuration, when the first hook member moves in the front-rear direction, the second hook member pivots, so that the second hook portion can be moved.

[0095] In one or more embodiments, when viewed from above, the extension line of the pivot axis of the pivoting portion may pass the upper surface of the second hook portion.

[0096] In the above-described configuration, force by which the guard portion is about to be released from the drive assembly inhibits the second hook member from pivoting.

[0097] In one or more embodiments, the drive assembly may include the hook cover to be inserted into an opening provided in the guard portion. The hook cover may support the first hook member and the second hook member.

[0098] In the above-described configuration, the hook cover to be inserted into the opening of the guard portion supports the first hook member and the second hook member, so that the guard portion of the scrubber can be smoothly attached and detached.

[0099] In one or more embodiments, the hook cover may include: a cylindrical portion to be inserted into the opening; and a slide portion provided on the outer surface of the cylindrical portion and guided by the guide portion provided on the guard portion.

[0100] In the above-described configuration, the hook cover is guided by the guide portion, so that the hook cover can be smoothly inserted into the opening.

[0101] In one or more embodiments, the cylindrical portion may include: a first hook hole in which a first hook portion of the first hook member is movably disposed in the first hook hole; and a second hook holes in which a second hook portion of the second hook member is movably disposed.

[0102] In the above-described configuration, the first hook portion can move between an engagement position and an release position in a state of being supported by the hook cover. The second hook portion can move between the engagement position and the release position in a state of being supported by the hook cover.

[0103] In one or more embodiments, the attaching/detaching mechanism may include a biasing member that biases the hook member such that the hook member approaches the guard portion.

[0104] In the above-described configuration, the hook member and the guard portion are stably engaged with each other.

[0105] In one or more embodiments, the hook member may include: a first hook member; and a second hook member that is connected to at least a part of the first hook member and that moves in synchronization with the first hook member. The biasing member may be disposed between the first hook member and at least a part of the hook cover that supports the first hook member to be movable. The biasing member may bias the first hook member such that the first hook member approaches the guard portion. The biasing member may bias the second hook member via the first hook member such that the second hook member approaches the guard portion.

[0106] In the above-described configuration, the hook member and the guard portion are stably engaged with each other. Furthermore, the second hook member moves in synchronization with the first hook member by operating the first hook member, so that the guard portion of the scrubber can be attached and detached with good operability.

[0107] In one or more embodiments, the drive assembly includes the hook cover to be inserted into the opening provided in the guard portion. The hook cover may support the hook member to be movable. When the biasing member biases the first hook member and the second hook member with the hook cover being inserted into the opening, an engaged state is established in which the first hook portions of the first hook member and the second hook portions of the second hook member are hooked on the guard portion. When the operation button portion provided on the first hook member is operated against the biasing force of the biasing member, a released state is established in which the first hook portions and the second hook portions are separated from the guard portion.

[0108] In the above-described configuration, the user of the scrubber can attach and detach the guard portion with a single touch.

[0109] Although embodiments according to the present disclosure will be described below with reference to the drawings, the present disclosure is not limited to the embodiments. Components of the embodiments described below can be appropriately combined. Furthermore, some components are not used in some cases.

[0110] In the embodiments, the positional relation between portions will be described by using terms of left, right, front, rear, up, and down. These terms indicate the relative position or direction with respect to the center of a scrubber 1.

First Embodiment

[0111] A first embodiment will be described.

Outline of Scrubber

[0112] FIG. 1 illustrates the scrubber 1 according to the first embodiment as viewed from the upper-right front. FIG. 2 illustrates the scrubber 1 according to the first embodiment as viewed from above. FIG. 3 illustrates the scrubber 1 according to the first embodiment as viewed from below. FIG. 4 illustrates the scrubber 1 according to the first embodiment as viewed from the right. FIG. 5 illustrates the scrubber 1 according to the first embodiment as viewed from the left. FIG. 6 illustrates the scrubber 1 according to the first embodiment as viewed from the front. FIG. 7 illustrates the scrubber 1 according to the first embodiment as viewed from the rear. FIG. 8 is a cross-sectional view illustrating the scrubber 1 according to the first embodiment.

[0113] The scrubber 1 is used for cleaning a cleaning target. Examples of the cleaning target include a floor. The scrubber 1 is an example of a floor cleaning machine. The scrubber 1 is also called a polisher.

[0114] The scrubber 1 includes a drive assembly 2, a tool 3, a guard portion 4, a main body assembly 5, a pole 6, a pole accommodating portion 7, a front grip 8, lights 9, a pivoting portion 10, an attaching/detaching mechanism 11, and an adjustment mechanism 12.

[0115] The drive assembly 2 includes a head housing 13, a motor 14, and a power transmission mechanism 15. The motor 14 is an inner rotor type DC brushless motor. The motor 14 rotates about a motor rotation axis AX extending in the up-down direction. The power transmission mechanism 15 transmits rotational force generated by the motor 14 to the tool 3.

[0116] The tool 3 is a cleaning rotating body that cleans the cleaning target. The tool 3 faces the cleaning target, and is rotated by the motor 14. The tool 3 rotates while being in contact with the cleaning target, so as to scrub or polish the cleaning target. In the embodiment, the tool 3 includes a brush 48 (e.g., see FIG. 26). Note that the tool 3 may include a polishing pad.

[0117] The guard portion 4 is attached to the drive assembly 2. The guard portion 4 can be attached to or detached from the drive assembly 2. At least a part of the guard portion 4 is disposed around the tool 3. When the scrubber 1 cleans the cleaning target, cleaning liquid may be sprinkled on the cleaning target. When the cleaning liquid is sprinkled on the cleaning target, the guard portion 4 is disposed around the tool 3 in order to inhibit scattering of the cleaning liquid.

[0118] The pole 6 is elongated in the front-rear direction. The pole 6 connects the pole accommodating portion 7 with the pivoting portion 10. The pole accommodating portion 7 is fixed to the front portion of a main body housing 16. The pole accommodating portion 7 has a cylindrical shape. As illustrated in FIG. 1, a sleeve 90 is disposed around the pole 6. The rear portion of the sleeve 90 is disposed inside the pole accommodating portion 7. The front portion of the sleeve 90 is disposed on the front side of the pole accommodating portion 7. The sleeve 90 is fixed to the pole accommodating portion 7. At least a part of the pole 6 is disposed inside the pole accommodating portion 7 and inside the sleeve 90. The pole 6 and the pole accommodating portion 7 have a telescopic structure. The pole 6 can move in the front-rear direction with respect to the pole accommodating portion 7 and the sleeve 90. A fastening mechanism capable of fastening the pole 6 is provided at the front portion of the sleeve 90. A fixing lever 23 is disposed at the front portion of the sleeve 90. When the fixing lever 23 is operated, the fastening mechanism of the sleeve 90 is operated, the pole 6 is fastened, and the position of the pole 6 is fixed with respect to the pole accommodating portion 7. When the fixing through the fixing lever 23 is released, the pole 6 can move with respect to the pole accommodating portion 7. When the pole 6 moves, the position of the pole 6 is adjusted with respect to the pole accommodating portion 7. When the position of the pole 6 is adjusted with respect to the pole accommodating portion 7, the length of the pole 6 between the pole accommodating portion 7 and the pivoting portion 10 is adjusted. When the pole 6 moves inside the pole accommodating portion 7 such that a spring pin (not illustrated) provided on the pole 6 comes in contact with the rear end of the sleeve 90, the pole 6 is adjusted to have the longest length between the pole accommodating portion 7 and the pivoting portion 10. When the pole 6 moves such that the front end of the sleeve 90 comes in contact with the rear end of the pivoting portion 10, the pole 6 is adjusted to have the shortest length between the pole accommodating portion 7 and the pivoting portion 10.

[0119] A user of the scrubber 1 grips the front grip 8. The front grip 8 is fixed to the pole accommodating portion 7. The front grip 8 has a substantially annular shape. The front grip 8 protrudes upward from the pole accommodating portion 7.

[0120] The front grip 8 includes a fixing mechanism 24. The fixing mechanism 24 fixes the front grip 8 to the pole accommodating portion 7. The fixing mechanism 24 includes a fastening mechanism disposed around the pole accommodating portion 7. When a dial 24A of the fixing mechanism 24 is rotated in one direction, the fastening mechanism operates to fasten the pole accommodating portion 7. When the fastening mechanism fastens the pole accommodating portion 7, the front grip 8 is fixed to the pole accommodating portion 7. When the dial 24A is rotated in the other direction, the fastening of the pole accommodating portion 7 through the fastening mechanism is released, and the fixing of the fixing mechanism 24 to the pole accommodating portion 7 is released. When the fixing of the fixing mechanism 24 is released, the front grip 8 can rotate around the pole accommodating portion 7, can move in the front-rear direction with respect to the pole accommodating portion 7, and can tilt in the front-rear direction.

[0121] The pivoting portion 10 supports the drive assembly 2 to be pivotable. The pivoting portion 10 includes a base 10A and a pair of support portions 10B. The base 10A is attached to the pole 6. The pair of support portions 10B are respectively disposed on the left and right sides of the drive assembly 2. The pivoting portion 10 supports the drive assembly 2 to be pivotable about a first assembly pivot axis NX extending in the front-rear direction. The pivoting portion 10 supports the drive assembly 2 to be pivotable about a second assembly pivot axis BX extending in the left-right direction. The pivoting portion 10 can pivot about the second assembly pivot axis BX between a first pivot position and a second pivot position. At the first pivot position, a longitudinal axis (not illustrated) of the pole 6 is perpendicular to the motor rotation axis AX. The pivoting portion 10 pivots forward by 90 degrees from the first pivot position to reach the second pivot position. The pivoting portion 10 can pivot about the first assembly pivot axis NX between a third pivot position and a fourth pivot position. The pivoting portion 10 pivots leftward by 30 degrees from the position where the second assembly pivot axis BX is perpendicular to the motor rotation axis AX to reach the third pivot position, and pivots rightward by 30 degrees to reach the fourth pivot position. A fixing mechanism 25 that restricts pivoting of the drive assembly 2 is provided between the drive assembly 2 and the pivoting portion 10. A lever 25A of the fixing mechanism 25 is operated to switch the drive assembly between pivoting about the first assembly pivot axis NX and fixing. A lever 25B of the fixing mechanism 25 is operated to switch the drive assembly 2 between pivoting about the second assembly pivot axis BX and fixing.

[0122] The lights 9 illuminate the cleaning target. Two lights 9 are provided in the pivoting portion 10. One light 9 is disposed on the left support portion 10B. The other light 9 is disposed on the right support portion 10B. The lights 9 emit illumination light in front of the scrubber 1.

[0123] The attaching/detaching mechanism 11 attaches and detaches the drive assembly 2 and the guard portion 4 to and from each other. The adjustment mechanism 12 adjusts the height of the guard portion 4 with respect to the drive assembly 2. The attaching/detaching mechanism 11 and the adjustment mechanism 12 will be described later.

Main Body Assembly

[0124] FIG. 9 illustrates the main body assembly 5 according to the first embodiment as viewed from above. FIG. 10 illustrates the main body assembly 5 according to the first embodiment as viewed from the right. In FIG. 10, a virtual line indicates a battery cover 22.

[0125] The main body assembly 5 includes the main body housing 16, a trigger lever 17, an interface panel 18, a controller 19, and a battery mounting portion 20. A battery pack 21 is mounted on the battery mounting portion 20. The battery cover 22 is attached to the lower portion of the main body housing 16.

[0126] The main body housing 16 accommodates at least the controller 19. The main body housing 16 includes a body portion 16A, a grip portion 16B, a controller accommodating portion 16C, a battery holder 16D, and a rubber portion 16E. The body portion 16A has a cylindrical shape and is elongated in the front-rear direction. The grip portion 16B extends rearward from the rear portion of the body portion 16A. The grip portion 16B has a substantially annular shape. The user of the scrubber 1 grips the grip portion 16B. The controller accommodating portion 16C accommodates the controller 19. The controller accommodating portion 16C is connected to the lower portion of the rear portion of the body portion 16A. The controller accommodating portion 16C is connected to the front portion of the lower portion of the grip portion 16B. The battery holder 16D holds the battery pack 21 via the battery mounting portion 20. The battery mounting portion 20 is disposed on the battery holder 16D. The battery holder 16D is disposed at the lower portion of the body portion 16A. The rubber portion 16E is disposed at the lower portion of the rear portion of the grip portion 16B.

[0127] The trigger lever 17 is disposed on the grip portion 16B. The user operates the trigger lever 17 in order to activate the motor 14. The controller 19 controls the motor 14 based on an operation signal generated by operating the trigger lever 17. The controller 19 drives or stops the motor 14 based on the operation signal from the trigger lever 17. The trigger lever 17 is operated to switch the motor between driving and stopping. The trigger lever 17 is disposed so as to face the inner space of the annular grip portion 16B. The trigger lever 17 protrudes downward from the upper portion of the grip portion 16B.

[0128] The user operates the interface panel 18. The interface panel 18 is disposed on the upper surface of the body portion 16A. The interface panel 18 is operated to change the setting of the motor 14. The interface panel 18 is operated to change the rotation speed of the motor 14. The interface panel 18 is operated to change the rotation direction of the motor 14. The controller 19 changes the setting of the motor 14 based on an operation signal generated by operating the interface panel 18.

[0129] As illustrated in FIG. 9, the interface panel 18 includes a rotation speed change button 18A and a reverse rotation button 18B. When the rotation speed change button 18A is long-pressed with the main power source of the scrubber 1 being off, the main power source of the scrubber 1 is switched to a state of on. When the rotation speed change button 18A is long-pressed with the main power source of the scrubber 1 being on, the main power source of the scrubber 1 is switched to a state of off. Each time the rotation speed change button 18A is short-pressed, the rotation speed of the motor 14 changes. When the rotation speed change button 18A is short-pressed once, the rotation speed of the motor 14 is set to a first rotation speed. When the rotation speed change button 18A is short-pressed once more, the rotation speed of the motor 14 is set to a second rotation speed higher than the first rotation speed. When the rotation speed change button 18A is short-pressed once more, the rotation speed of the motor 14 is set to a third rotation speed higher than the second rotation speed. When the rotation speed change button 18A is short-pressed once more, the rotation speed of the motor 14 is set to the first rotation speed. When the trigger lever 17 is operated with the rotation speed of the motor 14 being set by an operation of the rotation speed change button 18A, the motor 14 rotates at the set rotation speed. When the rotation speed change button 18A is short-pressed with the trigger lever 17 being operated, the rotation speed of the motor 14 changes with the motor 14 being driven.

[0130] When the rotation speed change button 18A is operated and the trigger lever 17 is then operated, the motor 14 rotates forward. When the reverse rotation button 18B is operated and the trigger lever 17 is then operated, the motor 14 reversely rotates only for a specified time, and then stops. The specified time is, for example, 0.1 seconds or more and 1 second or less.

[0131] The controller 19 controls at least the motor 14. The controller 19 includes a circuit board and a plurality of electronic components mounted on the circuit board. Examples of the electronic components include a microcomputer and a switching element. The controller 19 is disposed in the controller accommodating portion 16C.

[0132] The battery mounting portion 20 is disposed at the lower portion of the battery holder 16D. The battery mounting portion 20 is disposed forward of the grip portion 16B and rearward of the front grip 8. The battery mounting portion 20 is disposed forward of the trigger lever 17.

[0133] The battery mounting portion 20 is connected to the battery pack 21. The battery pack 21 is mounted on the battery mounting portion 20. The battery pack 21 can be attached to and detached from the battery mounting portion 20. In the embodiment, one battery mounting portion 20 is provided. One battery pack 21 is mounted on the battery mounting portion 20.

[0134] The battery pack 21 supplies power to the motor 14. The battery pack 21 is a general-purpose battery that can be used as a power source of various electric devices. The battery pack 21 can be used as a power source of a power tool. The battery pack 21 can be used as a power source of an electric device other than the power tool. The battery pack 21 includes a lithium-ion battery. The battery pack 21 is a rechargeable battery that can be charged. The battery pack 21 may be a battery pack for a power tool.

[0135] The rated voltage of the battery pack 21 is not particularly limited. The rated voltage of the battery pack 21 may be 18 V, 36 V, or 72 V. The rated voltage of the battery pack 21 may be less than 18 V, for example, 10.8 V or 14.4 V.

[0136] The battery cover 22 covers the battery pack 21 mounted on the battery mounting portion 20. The battery cover 22 protects the battery pack 21 mounted on the battery mounting portion 20. When cleaning liquid is sprinkled on the cleaning target, the battery cover 22 inhibits the cleaning liquid from adhering to the battery pack 21. The battery cover 22 is made of a material that is resistant to the cleaning liquid and that has a small specific gravity. In the embodiment, the battery cover 22 is formed of, for example, polypropylene resin.

[0137] When the battery pack 21 is mounted on the battery mounting portion 20, a bottom surface 21A of the battery pack 21 is substantially parallel to a bottom surface 22A of the battery cover 22, and a rear surface 21B of the battery pack 21 is substantially parallel to a rear surface 22B of the battery cover 22.

[0138] Each of the bottom surface 22A and the rear surface 22B is substantially flat. The bottom surface 22A is substantially orthogonal to the rear surface 22B.

[0139] FIG. 11 illustrates the operation of the battery cover 22 according to the first embodiment. FIG. 12 illustrates the battery pack 21 released from the battery mounting portion 20 according to the first embodiment.

[0140] The front portion of the battery cover 22 is pivotably supported on the lower portion of the main body housing 16 via a hinge mechanism 22C. The rear portion of the battery cover 22 is detachably attached to the lower portion of the main body housing 16 via a latch mechanism 22D.

[0141] As illustrated in FIG. 11, when a latch lever 22E is operated, the fixing of the battery cover 22 to the main body housing 16 through the latch mechanism 22D is released. When the fixing of the battery cover 22 is released, the battery cover 22 can pivot about the hinge mechanism 22C. When the battery cover 22 pivots, the battery pack 21 appears. As illustrated in FIG. 12, when removed from the battery mounting portion 20 to the lower rear side, the battery pack 21 is released from the battery mounting portion 20. The battery pack 21 is attached to the battery mounting portion 20 by being inserted into the battery mounting portion 20 from the lower rear side of the battery mounting portion 20.

[0142] When mounted on the battery mounting portion 20, the battery pack 21 can supply power to the motor 14. The power from the battery pack 21 is supplied to the motor 14 via a cable. As illustrated in FIG. 1 etc., a tube 26 that accommodates a cable is disposed between the pivoting portion 10 and the drive assembly 2. The tube 26 is flexible. The tube 26 protects the cable. The motor 14 is driven based on the power supplied from the battery pack 21.

Method of Temporarily Placing Scrubber

[0143] FIG. 13 illustrates an example of a method of temporarily placing the scrubber according to the first embodiment. The battery cover 22 is connected to the battery holder 16D in the lower portion of the body portion 16A. Here, the battery cover 22 is disposed forward of the grip portion 16B and rearward of the front grip 8. The battery cover 22 is disposed forward of the trigger lever 17. Each of the bottom surface 22A and the rear surface 22B is substantially flat. The bottom surface 22A is substantially orthogonal to the rear surface 22B. As illustrated in FIG. 13, the user of the scrubber 1 can use the battery cover 22 to stand the scrubber 1 on the top surface of a structure (e.g., a top surface of desk).

[0144] FIG. 14 illustrates the example of the method of temporarily placing the scrubber 1 according to the first embodiment. As illustrated in FIG. 14, the rubber portion 16E is disposed at the rear portion of the grip portion 16B. The rubber portion 16E includes a rubber plate attached to the rear portion of the grip portion 16B. The user can lean the scrubber 1 against a wall of a structure such that the rubber portion 16E is in contact with the wall of the structure. The rubber portion 16E inhibits the structure from being damaged.

[0145] FIG. 15 illustrates the example of the method of temporarily placing the scrubber 1 according to the first embodiment. When cleaning a cleaning target by using the scrubber 1, the user may move together with a building maintenance cart 27. As illustrated in FIG. 15, the user can hook the front grip 8 on a building maintenance cart 27. The front grip 8 protrudes from the pole accommodating portion 7. The user can adjust the angle formed by the front grip 8 and the pole accommodating portion 7 with the fixing through the fixing mechanism 24 being released. Therefore, the front grip 8 is easily hooked on at least a part of the building maintenance cart 27.

Drive Assembly

[0146] FIG. 16 illustrates the front portion of the scrubber 1 according to the first embodiment as viewed from the upper-right front. FIGS. 17 and 18 are cross-sectional views illustrating the front portion of the scrubber 1 according to the first embodiment. FIG. 17 is a cross-sectional arrow view taken along line A-A in FIG. 16. FIG. 18 is a cross-sectional arrow view taken along line B-B in FIG. 16. FIG. 19 is an exploded view illustrating the front portion of the scrubber 1 according to the first embodiment as viewed from the upper-right front. FIG. 20 illustrates the drive assembly 2 according to the first embodiment as viewed from the upper-right front. FIG. 21 illustrates the drive assembly 2 according to the first embodiment as viewed from the upper-left rear. FIG. 22 illustrates the drive assembly 2 according to the first embodiment as viewed from the lower-right front. FIG. 23 is an exploded view illustrating the drive assembly 2 according to the first embodiment as viewed from the upper-right front.

[0147] The drive assembly 2 includes: the motor 14; the power transmission mechanism 15; a motor case 28 that accommodates the motor 14; a gear case 29 that accommodates the power transmission mechanism 15; the head housing 13 that accommodates the motor case 28 and the gear case 29; a hook member 30; a hook cover 33; and an adapter 34.

[0148] The head housing 13 has a so-called half-split structure. The head housing 13 includes a pair of half-split housings. The head housing 13 includes a left housing 13L and a right housing 13R disposed on the right side of the left housing. The left housing 13L and the right housing 13R constitute the pair of half-split housings. A plurality of screws 35 fixes the left housing 13L and the right housing 13R to each other.

[0149] The motor 14 is an inner rotor type DC brushless motor. The motor 14 includes a stator 36, a rotor 37, and a rotor shaft 38. The stator 36 is disposed around the rotor 37. The rotor 37 is disposed around the rotor shaft 38. The rotor shaft 38 is fixed to the rotor 37. The rotor 37 and the rotor shaft 38 rotate about the motor rotation axis AX. As illustrated in FIG. 17, the stator 36 includes a stator core 36A, an insulator 36B, and coils 36C. The rotor 37 includes a rotor core 37A and a magnet 37B.

[0150] The stator core 36A is disposed outside the rotor 37 in the radial direction of the motor rotation axis AX. The stator core 36A includes a plurality of laminated steel plates. The steel plates are made of an iron-based metal. The stator core 36A has an annular shape. The stator core 36A includes a plurality of teeth that respectively support the coils 36C. The stator core 36A is held on the inner surface of the motor case 28.

[0151] The insulator 36B is fixed to the stator core 36A. The insulator 36B is interposed between the stator core 36A and the coils 36C. The insulator 36B is an electric insulation member made of synthetic resin.

[0152] The coils 36C are mounted on the stator core 36A via the insulator 36B. The coils 36C are respectively disposed around the teeth of stator core 36A via the insulator 36B. The stator core 36A and the coils 36C are electrically insulated from each other by the insulator 36B.

[0153] The rotor core 37A is made of steel. The rotor core 37A has a substantially cylindrical shape. The magnet 37B is disposed inside the rotor core 37A. The rotor 37 is an interior permanent magnet (IPM) type rotor.

[0154] The rotor shaft 38 is elongated in the up-down direction. The rotor shaft 38 is disposed inside the rotor core 37A. The rotor core 37A and the rotor shaft 38 are fixed to each other. The rotor 37 and the rotor shaft 38 rotate about the motor rotation axis AX extending in the up-down direction.

[0155] The upper end portion of the rotor shaft 38 is rotatably supported by a bearing 38A. The lower portion of the rotor shaft 38 is rotatably supported by a bearing 38B. The bearing 38A and the bearing 38B are held by the motor case 28.

[0156] A sensor substrate 39 is disposed at the upper portion of the stator 36. The sensor substrate 39 detects rotation of the rotor 37. The sensor substrate 39 is fixed to the insulator 36B. The sensor substrate 39 includes an annular circuit board and a magnetic sensor mounted on the circuit board. The magnetic sensor detects the position of the rotor 37 in the rotation direction by detecting the magnetic field of the magnet 37B of the rotor 37. Detection data of the sensor substrate 39 is transmitted to the controller 19. The controller 19 controls the motor 14 based on the detection data of the sensor substrate 39.

[0157] A fan 40 is fixed to the lower portion of the rotor shaft 38. In the up-down direction, the fan 40 is disposed between the stator 36 and the bearing 38B. When the fan 40 rotates, air flows into the head housing 13 from an air-intake port 13A provided at the upper portion of the left housing 13L. The air flowing in from the air-intake port 13A flows into the interior of the motor case 28 via an inflow port provided in the motor case 28, and flows around the motor 14. The air flows around the motor 14 to cool the motor 14. The air that has flowed around the motor 14 flows out to the exterior of an outflow port provided in the motor case 28. The air that has flowed out from the motor case 28 flows out to the exterior of the head housing 13 via an exhaust port 13B provided at the upper portion of the left housing 13L.

[0158] The power transmission mechanism 15 includes a planetary gear mechanism. The power transmission mechanism 15 includes a first-stage planetary gear mechanism 151 and a second-stage planetary gear mechanism 152. The gear case 29 accommodates the power transmission mechanism 15. As illustrated in FIG. 18, a pinion gear 15A is provided at the lower end of the rotor shaft 38. The pinion gear 15A meshes with planetary gears 15B of the first-stage planetary gear mechanism 151. An internal gear 15C of the first-stage planetary gear mechanism 151 is disposed around the planetary gears 15B. The internal gear 15C is fixed to the inner surface of the gear case 29. A carrier 15D of the first-stage planetary gear mechanism 151 is connected to the planetary gears 15B. The carrier 15D meshes with planetary gears 15E of the second-stage planetary gear mechanism 152. An internal gear 15F of the second-stage planetary gear mechanism 152 is disposed around the planetary gears 15E. The internal gear 15F is fixed to the inner surface of the gear case 29. A carrier 15G of the second-stage planetary gear mechanism 152 is connected to the internal gear 15F.

[0159] The power transmission mechanism 15 includes a rotation shaft 41 fixed to the carrier 15G. The rotation shaft 41 is rotatably supported by a bearing 42. The bearing 42 is held by a gear case 2. The lower end portion of the rotation shaft 41 is fixed to the adapter 34 via an intermediate member 44 by a screw 43. A cover 45 is fixed to the lower surface of the adapter 34. The cover 45 is disposed so as to cover the screw 43 from below. The cover 45 is fixed to the adapter 34 by three screws 46.

[0160] The hook cover 33 is fixed to the gear case 29. The hook cover 33 is fixed to the gear case 29 by four screws 47. Screw bosses 29A are provided on an outer peripheral surface of the gear case 29. At least a part of the gear case 29 including the screw bosses 29A is disposed inside the hook cover 33. Screw openings 33D (e.g., see FIG. 41) into which the screws 47 are to be inserted are provided at the bottom portion of the hook cover 33. The screws 47 are inserted into the screw openings 33D from below the lower surface of the hook cover 33, and then inserted into screw holes of the screw bosses 29A.

[0161] FIG. 24 illustrates the adapter 34 and the cover 45 according to the first embodiment as viewed from the right. FIG. 25 is a cross-sectional view illustrating the adapter 34 and the cover 45 according to the first embodiment. The adapter 34 is connected to the tool 3. The tool 3 is connected to the drive assembly 2 via the adapter 34.

[0162] The adapter 34 includes a main body portion 34A, a projection 34D, claw portions 34B, and connection portions 34C. The projection 34D protrudes downward from the central portion of the main body portion 34A. The claw portions 34B are provided below the main body portion 34A. The connection portions 34C connect ends of the claw portions 34B with the lower surface of the main body portion 34A in the circumferential direction. The claw portions 34B are disposed around the projection 34D. Three claw portions 34B are provided at equal intervals around the projection 34D. At least a part of the tool 3 is inserted into space 34E between the lower surface of the main body portion 34A and the upper surfaces of the claw portions 34B. As illustrated in FIG. 25, upper surfaces 34F of the claw portions 34B are inclined upward toward the outside in the radial direction of the motor rotation axis AX.

Tool

[0163] FIG. 26 illustrates the tool 3 according to the first embodiment as viewed from the upper-right front. FIG. 27 is an exploded view illustrating the tool 3 according to the first embodiment as viewed from the upper-right front. FIG. 28 is a cross-sectional view illustrating the tool 3 according to the first embodiment. The tool 3 includes the brush 48, a base plate 49, an adapter 50, and screws 51.

[0164] The base plate 49 includes an annular base portion 49A, an annular connection portion 49B, and a plurality of screw holes 49C. The connection portion 49B protrudes radially inward from the base portion 49A. The plurality of screw holes 49C is provided in the connection portion 49B. The brush 48 is attached to the lower surface of the base portion 49A.

[0165] The adapter 50 is connected to the adapter 34. The adapter 50 includes an annular body portion 50A, a peripheral wall portion 50B, claw portions 50C, and a plurality of screw openings 50D. The peripheral wall portion 50B protrudes upward from the central portion of the body portion 50A. The claw portions 50C protrude radially inward from the peripheral wall portion 50B. The screw openings 50D are provided at the peripheral edge of the body portion 50A.

[0166] Three screw holes 49C are provided at equal intervals in the circumferential direction of the connection portion 49B. Three screw openings 50D are provided at equal intervals in the circumferential direction of the body portion 50A. The adapter 50 and the base plate 49 are fixed by the three screws 51. The screws 51 are inserted into the screw openings 50D from above the adapter 50, and then inserted into the screw holes 49C of the base plate 49.

[0167] The claw portions 50C are hooked on the claw portions 34B. When the claw portions 50C are hooked on the claw portions 34B, the tool 3 is fixed to the drive assembly 2.

Connection Between Drive Assembly and Tool

[0168] FIG. 29 illustrates the tool 3 connected to the drive assembly 2 according to the first embodiment as viewed from the upper-right front. FIG. 30 illustrates the tool 3 connected to the drive assembly 2 according to the first embodiment as viewed from below. As illustrated in FIG. 22 etc., three claw portions 34B are provided at equal intervals in the circumferential direction in the lower portion of the adapter 34. As illustrated in FIG. 26 etc., three claw portions 50C are provided at equal intervals in the circumferential direction in the upper portion of the adapter 50. When the claw portions 50C are hooked on the claw portions 34B, the claw portions 50C are disposed between respective pairs of adjacent claw portions 34B. After the claw portions 50C are disposed between respective pairs of adjacent claw portions 34B, the drive assembly 2 and the tool 3 are relatively rotated in a first direction so that the claw portions 50C are inserted into the space 34E between the lower surface of the main body portion 34A of the adapter 34 and the upper surface of the claw portion 34B. The drive assembly 2 and the tool 3 are relatively rotated, so that the claw portion 50C is inserted into the space of the adapter 34. The claw portions 50C are sandwiched between the main body portion 34A of the adapter 34 and the claw portions 34B, so that the tool 3 is fixed to the drive assembly 2. As described above, the upper surfaces 34F of the claw portions 34B are inclined upward toward the outside in the radial direction of the motor rotation axis AX. Therefore, the claw portions 50C are sandwiched between the main body portion 34A and the radially outside ends of the upper surfaces 34F of the claw portions 34B. The front portions of the upper surfaces 34F of the claw portions 34B do not come in contact with the claw portions 50C, and only the radially outside ends of the upper surfaces 34F of the claw portions 34B come in contact with the claw portions 50C. The adapter 34 can thus fix the claw portions 50C with appropriate sandwiching force. The drive assembly 2 and the tool 3 are relatively rotated in a second direction opposite to the first direction, so that the claw portions 50C are removed from the space 34E, and the tool 3 is released from the drive assembly 2.

Guard Portion

[0169] FIG. 31 illustrates the drive assembly 2 and the guard portion 4 according to the first embodiment as viewed from the upper-right front. In FIG. 31, a virtual line indicates a part of the guard portion 4. FIG. 32 illustrates the guard portion 4 according to the first embodiment as viewed from the upper-right front. FIG. 33 illustrates the guard portion 4 according to the first embodiment as viewed from the right. FIG. 34 illustrates the guard portion 4 according to the first embodiment as viewed from the front. FIG. 35 is a cross-sectional view illustrating the guard portion 4 according to the first embodiment. FIG. 36 is an exploded view illustrating the guard portion 4 according to the first embodiment as viewed from the upper-right front.

[0170] The guard portion 4 is attachable to or detachable from the drive assembly 2. The guard portion 4 is disposed at least partially around the tool 3. The guard portion 4 includes a brush 52, a brush support 53, a support member 54, and a cover 55.

[0171] The brush support 53 has an annular shape. The brush support 53 is disposed around the tool 3. The brush 52 is attached to the lower surface of the brush support 53.

[0172] The support member 54 has an annular shape. At least a part of the support member 54 is disposed inside the brush support 53. At least a part of the support member 54 is disposed upward of the brush support 53. The support member 54 supports the cover 55 from below.

[0173] The cover 55 has a disk shape. The cover 55 is fixed to the support member 54. An opening 59 is provided at the central portion of the cover 55.

[0174] The brush support 53 and the brush 52 are connected to the cover 55 via a floating mechanism 57. The brush support 53 is an example of a moving member movably connected to the cover 55. The floating mechanism 57 includes coil springs 58 disposed between the cover 55 and the brush support 53. The coil springs 58 bias the brush support 53 and the brush 52 downward.

[0175] The support member 54 and the cover 55 are fixed by screws 56. Six screws 56 are provided. The six screws 56 are arranged at equal intervals in the circumferential direction of the support member 54. The screws 56 are inserted into screw openings 54A provided in the support member 54 from below the support member 54. Screw portions of the screws 56 are inserted into screw holes provided in the cover 55. The screws 56 are coupled to the screw holes of the cover 55 with the screws 56 being inserted into the screw openings 54A of the support member 54, so that the support member 54 and the cover 55 are fixed to each other by the screws 56.

[0176] The coil springs 58 are disposed between the cover 55 and the brush support 53. Six coil springs 58 are provided. The six coil springs 58 are arranged at equal intervals in the circumferential direction of the brush support 53. The coil springs 58 are disposed between respective pairs of adjacent screws 56 in the circumferential direction. The lower ends of the coil springs 58 are connected to the brush support 53. The upper ends of the coil springs 58 are connected to the cover 55.

[0177] The brush support 53 and the brush 52 are supported by the cover 55 via the floating mechanism 57 including the coil springs 58. The brush support 53 and the brush 52 are movable with respect to the cover 55 in the up-down direction parallel to the motor rotation axis AX. The brush support 53 and the brush 52 are movable with respect to the cover 55 in the rotation direction about a front-rear axis orthogonal to the motor rotation axis AX. The brush support 53 and the brush 52 are movable with respect to the cover 55 in the rotation direction about a left-right axis orthogonal to the motor rotation axis AX. The front-rear axis refers to an axis passing through the motor rotation axis AX and extending in the front-rear direction. The left-right axis refers to an axis passing through the motor rotation axis AX and extending in the left-right direction. That is, the brush support 53 and the brush 52 are movable in the up-down direction, rotate or incline in the rotation direction about the front-rear axis, and pivot or incline in the rotation direction about the left-right axis.

[0178] As illustrated in FIG. 35, the brush support 53 includes a support portion 53A and an engaging portion 53B. The brush 52 is attached to the support portion 53A. The engaging portion 53B protrudes to the inside of the brush support 53 in the radial direction from the upper end of the support portion 53A. The support member 54 includes a lower stopper portion 54S disposed below the engaging portion 53B. The cover 55 includes an upper stopper portion 55S disposed above the engaging portion 53B. In the up-down direction, the engaging portion 53B is movable between the lower stopper portion 54S and the upper stopper portion 55S. Movable ranges of the brush support 53 and the brush 52 in the up-down direction are specified by the lower stopper portion 54S and the upper stopper portion 55S. The brush support 53 and the brush 52 are movable between a lower end position and an upper end position. At the lower end position, the lower surface of the engaging portion 53B is in contact with the upper surface of the lower stopper portion 54S. At the upper end position, the upper surface of the engaging portion 53B is in contact with the lower surface of the upper stopper portion 55S. The movable ranges of the brush support 53 and the brush 52 in the up-down direction are specified between the lower end position and the upper end position. In the embodiment, the movable range (movable distance) of the brush support 53 and the brush 52 in the up-down direction is, for example, 7 mm.

[0179] At least a part of the drive assembly 2 is inserted into the opening 59 of the cover 55. The drive assembly 2 is fixed to the cover 55. In the embodiment, the hook cover 33 is inserted into the opening 59. The hook cover 33 and the cover 55 are fixed to each other.

[0180] The cover 55 has a protruding portion 60 disposed around the opening 59. The protruding portion 60 has an annular shape in a plane orthogonal to the motor rotation axis AX. The upper surface of the protruding portion 60 includes first support surfaces 61 and second support surfaces 62 having heights different from those of the first support surfaces 61. The second support surfaces 62 are disposed at positions lower than those of the first support surfaces 61. In the circumferential direction of the motor rotation axis AX, the first support surfaces 61 are disposed at positions different from those of the second support surfaces 62. In the plane orthogonal to the motor rotation axis AX, the first support surfaces 61 and the second support surfaces 62 have arc shapes. Two first support surfaces 61 are provided at intervals around the opening 59. Two second support surfaces 62 are provided at intervals around the opening 59. The second support surfaces 62 are provided between two adjacent first support surfaces 61. That is, the first support surfaces 61 and the second support surfaces 62 are alternately arranged in the circumferential direction. The pair of first support surfaces 61 are disposed so as to face each other across the motor rotation axis AX. External shapes and areas of the pair of first support surfaces 61 are equal to each other. The pair of second support surfaces 62 is disposed so as to face each other across the motor rotation axis AX. External shapes and areas of the pair of second support surfaces 62 are equal to each other.

[0181] Guide portions 63 are provided so as to be connected to the first support surfaces 61. The guide portions 63 are provided on the inner surface of the cover 55 connected to the opening 59. Each of the guide portions 63 include a pair of vertical ribs 63A provided on the inner surface of the cover 55. The vertical ribs 63A extend in the up-down direction.

[0182] Guide portions 64 are provided so as to be connected to the second support surfaces 62. The guide portion 64 is provided on the inner surface of the cover 55 connected to the opening 59. The guide portion 64 includes a pair of vertical ribs 64A provided on the inner surface of the cover 55. The vertical ribs 64A extend in the up-down direction.

Attaching/Detaching Mechanism

[0183] FIG. 37 illustrates the attaching/detaching mechanism 11 according to the first embodiment as viewed from the upper-left front. FIG. 38 illustrates the attaching/detaching mechanism 11 according to the first embodiment as viewed from the upper-right rear. FIG. 39 illustrates the attaching/detaching mechanism 11 according to the first embodiment as viewed from above. FIG. 40 is a cross-sectional view illustrating the attaching/detaching mechanism 11 according to the first embodiment. FIG. 41 is an exploded view illustrating the attaching/detaching mechanism 11 according to the first embodiment as viewed from the upper-left front. FIG. 42 is an exploded view illustrating the attaching/detaching mechanism 11 according to the first embodiment as viewed from the upper-right rear.

[0184] The attaching/detaching mechanism 11 attaches and detaches the drive assembly 2 and the guard portion 4 to and from each other. The attaching/detaching mechanism 11 is provided on one or both of the drive assembly 2 and the guard portion 4. In the embodiment, at least a part of the attaching/detaching mechanism 11 is provided in the drive assembly 2. The attaching/detaching mechanism 11 includes the hook member 30 provided on the drive assembly 2. The hook member 30 is movably supported by the drive assembly 2.

[0185] In the embodiment, the attaching/detaching mechanism 11 includes a hook member 30, a hook cover 33, and a biasing member 68. The hook member 30 is movably supported by the hook cover 33. The hook cover 33 is inserted into the opening 59 provided in the cover 55 of the guard portion 4. The hook cover 33 is inserted into the opening 59 and the hook member 30 is hooked on a hooked portion (recess) provided on the inner surface of the cover 55, so that the drive assembly 2 and the guard portion 4 are fixed to each other. The hook member 30 is released from the cover 55, so that the fixing of the drive assembly 2 and the guard portion 4 to each other is released. When the hook member 30 is in an engaged state in which the hook member 30 is hooked on the cover 55, the drive assembly 2 and the guard portion 4 are fixed to each other. When the hook member 30 is in a released state in which the hook member 30 is released from the cover 55, the fixing of the drive assembly 2 and the guard portion 4 to each other is released.

[0186] FIGS. 37 to 42 illustrate the attaching/detaching mechanism 11 in the engaged state.

[0187] In the embodiment, the hook member 30 includes a first hook member 31 and a second hook member 32. The first hook member 31 and the second hook member 32 are movably supported by the hook cover 33. The second hook member 32 is connected to at least a part of the first hook member 31. When the first hook member 31 moves, the second hook member 32 moves in synchronization with the first hook member 31.

[0188] The first hook member 31 includes a main body portion 31A, first hook portions 31B, an operation button portion 31C, connecting holes 31D, release holes 31E, and a base portion 31G.

[0189] The main body portion 31A has an annular shape. The main body portion 31A is disposed around the rotation shaft 41 that connects the motor 14 with the tool 3. As illustrated in FIGS. 17 and 18, parts of the rotation shaft 41 and the gear case 29 are inserted into the main body portion 31A.

[0190] Protrusions 31F are provided on the left portion and the right portion of the main body portion 31A, respectively. A protrusion 31F in the left portion of the main body portion 31A protrudes leftward from the left end of the main body portion 31A. A protrusion 31F in the right portion of the main body portion 31A protrudes rightward from the right end of the main body portion 31A. The protrusions 31F widen the width of the main body portion 31A in the left-right direction. The protrusions 31F improve the strength of the main body portion 31A.

[0191] The first hook portions 31B are disposed below the main body portion 31A. The first hook portions 31B are hooked on first hooked portions of the cover 55 of the guard portion 4. The first hooked portions each include a recess provided on the inner surface of the cover 55. The base portion 31G protrudes downward from the front portion of the lower surface of the main body portion 31A. The first hook portions 31B protrude forward from the base portion 31G. Two first hook portions 31B are provided with a gap therebetween in the left-right direction.

[0192] The operation button portion 31C is provided at the front portion of the main body portion 31A. The operation button portion 31C protrudes forward from the front portion of the main body portion 31A. As illustrated in FIG. 18 etc., the operation button portion 31C protrudes forward from the head housing 13 of the drive assembly 2. The operation button portion 31C protrudes forward from the hook cover 33 of the drive assembly 2.

[0193] The connecting holes 31D are provided at the rear portion of the main body portion 31A. The connecting holes 31D penetrate the upper surface and the lower surface of the main body portion 31A. Two connecting holes 31D are provided at the rear portion of the main body portion 31A with a gap therebetween in the left-right direction. At least a part of the second hook member 32 is inserted into the connecting holes 31D.

[0194] The release holes 31E are provided forward of the connecting holes 31D at the rear portion of the main body portion 31A. The release holes 31E penetrate the upper surface and the lower surface of the main body portion 31A. Two release holes 31E are provided at the rear portion of the main body portion 31A with a gap therebetween in the left-right direction. At least a part of the second hook member 32 is inserted into the release holes 31E.

[0195] FIG. 43 illustrates the second hook member 32 according to the first embodiment as viewed from above. The second hook member 32 includes a base portion 32A, second hook portions 32B, a pivoting portion 32C, insertion portions 32D, and protrusions 32E.

[0196] The base portion 32A has a plate shape. The second hook portions 32B are hooked on the second hooked portions of the cover 55 of the guard portion 4. The second hooked portions each includes a recess provided on the inner surface of the cover 55. The second hook portions 32B protrude rearward from the base portion 32A. Two second hook portions 32B are provided with a gap therebetween in the left-right direction.

[0197] The pivoting portion 32C has a rod shape elongated in the left-right direction. In the up-down direction, the pivoting portion 32C is disposed between the insertion portions 32D and the second hook portions 32B. The second hook portions 32B are disposed downward of the insertion portions 32D. As illustrated in FIG. 43, a pivot axis CX of the pivoting portion 32C extends in the left-right direction. The pivoting portion 32C is pivotably supported by the hook cover 33.

[0198] FIG. 43 illustrates the second hook member 32 in the engaged state. As illustrated in FIG. 43, when viewed from above, the extension line of the pivot axis CX of the pivoting portion 32C passes the upper surface of the second hook portions 32B. In the engaged state, the extension line of the pivot axis CX of the pivoting portion 32C passes the upper surface of the second hook portions 32B when viewed from above.

[0199] The insertion portions 32D protrude upward from the upper surface of the base portion 32A. Two insertion portions 32D are provided with a gap therebetween in the left-right direction. The insertion portions 32D are inserted into the connecting holes 31D of the first hook member 31. The insertion portions 32D are inserted into the connecting holes 31D, so that the first hook member 31 and the second hook member 32 are connected to each other.

[0200] The protrusions 32E protrude forward from the front surface of the base portion 32A. Two protrusions 32E are provided with a gap therebetween in the left-right direction. A left protrusion 32E protrudes forward from an upper left region on the front surface of the base portion 32A. A right protrusion 32E protrudes forward from an upper right region on the front surface of the base portion 32A. The protrusions 32E can be inserted into the release holes 31E.

[0201] The hook cover 33 has a cup shape. The hook cover 33 includes a cylindrical portion 33A, a bottom portion 33B, a flange portion 33C, the screw openings 33D, first hook holes 33E, second hook holes 33F, support ribs 33G, support ribs 33H, a support rib 33J, and slide portions 67.

[0202] The cylindrical portion 33A is disposed around the motor rotation axis AX. As illustrated in FIGS. 17 and 18, parts of the rotation shaft 41 and the gear case 29 are inserted into the cylindrical portion 33A. The cylindrical portion 33A is inserted into the opening 59 of the guard portion 4.

[0203] The bottom portion 33B has a plate shape and is disposed inside the cylindrical portion 33A. The bottom portion 33B is connected to the inner surface of the cylindrical portion 33A so as to cover the lower portion of the cylindrical portion 33A.

[0204] The flange portion 33C is disposed at the upper end of the cylindrical portion 33A. The flange portion 33C protrudes outward in the radial direction of the motor rotation axis AX from the upper end of the cylindrical portion 33A.

[0205] The lower surface of the flange portion 33C includes first supported surfaces 65 and second supported surfaces 66 having heights different from those of the first supported surfaces 65. The second supported surfaces 66 are disposed at positions higher than those of the first supported surfaces 65. In the circumferential direction of the motor rotation axis AX, the first supported surfaces 65 are disposed at positions different from those of the second supported surfaces 66. In the plane orthogonal to the motor rotation axis AX, the first supported surfaces 65 and the second supported surfaces 66 have arc shapes. TWO first supported surfaces 65 are provided at intervals around the cylindrical portion 33A. Two second supported surfaces 66 are provided at intervals around the cylindrical portion 33A. The second supported surfaces 66 are provided between adjacent first supported surfaces 65. That is, the first supported surfaces 65 and the second supported surfaces 66 are alternately arranged in the circumferential direction. The pair of first supported surfaces 65 are disposed so as to face each other across the motor rotation axis AX. External shapes and areas of the pair of first supported surfaces 65 are equal to each other. A pair of second supported surfaces 66 are disposed so as to face each other across the motor rotation axis AX. External shapes and areas of the pair of second supported surfaces 66 are equal to each other.

[0206] The screw openings 33D penetrate the upper surface and the lower surface of the bottom portion 33B. Four screw openings 33D are provided in the bottom portion 33B. The screws 47 are inserted into the screw openings 33D. The screws 47 fix the hook cover 33 and gear case 29 to each other. The hook cover 33 is fixed to the gear case 29 by four screws 47. The screw bosses 29A are provided on the outer peripheral surface of the gear case 29. At least a part of the gear case 29 including the screw bosses 29A is disposed inside the hook cover 33. The screws 47 are inserted into the screw openings 33D from below the lower surface of the hook cover 33, and then inserted into the screw holes of the screw bosses 29A.

[0207] The first hook holes 33E are provided at the front portion of the cylindrical portion 33A. The first hook holes 33E penetrate the inner surface and the outer surface of the cylindrical portion 33A. The first hook portions 31B of the first hook member 31 are movably arranged in the first hook holes 33E. Two first hook holes 33E are provided at intervals in the left-right direction in accordance with the first hook portions 31B. The base portion 31G of the first hook member 31 is disposed inside the cylindrical portion 33A. The first hook portions 31B protruding forward from the base portion 31G are inserted into the first hook holes 33E from the inner surface side of the cylindrical portion 33A. The first hook portions 31B is movable between engagement positions and release positions. The engagement positions are located outside the outer surface of the cylindrical portion 33A. The release positions are located inside the outer surface of the cylindrical portion 33A. The first hook portions 31B are disposed at the engagement positions, so that the first hook portions 31B are brought into an engaged state in which the first hook portions 31B are hooked on the first hooked portions of the cover 55. When the first hook portions 31B are disposed at the release positions, the first hook portions 31B are brought into a released state in which the first hook portions 31B are released from the first hooked portions of the cover 55.

[0208] The second hook holes 33F are provided at the rear portion of the cylindrical portion 33A. The second hook holes 33F penetrate the inner surface and the outer surface of the cylindrical portion 33A. The second hook portions 32B of the second hook member 32 are movably arranged in the second hook holes 33F. Two second hook holes 33F are provided with a gap in the left-right direction in accordance with the second hook portions 32B. The base portion 32A of the second hook member 32 is disposed inside the cylindrical portion 33A. The second hook portions 32B protruding rearward from the base portion 32A are inserted into the second hook holes 33F from the inner surface side of the cylindrical portion 33A. The second hook portions 32B is movable between engagement positions and release positions. The engagement positions are placed outside the outer surface of the cylindrical portion 33A. The release positions are placed inside the outer surface of the cylindrical portion 33A. The second hook portions 32B are disposed at the engagement positions, so that the second hook portions 32B are brought into an engaged state in which the second hook portions 32B are hooked on the second hooked portions of the cover 55. The second hook portions 32B are disposed at the release positions, so that the second hook portions 32B are brought into a released state in which the second hook portions 32B are released from the second hooked portions of the cover 55.

[0209] The support ribs 33G protrude upward from the upper surface of the bottom portion 33B. Four support ribs 33G are provided at intervals. The first hook member 31 is supported on the upper surfaces of the support ribs 33G. The support ribs 33G support the first hook member 31 to be movable. The first hook member 31 is movable in the front-rear direction in a state of being supported by the support ribs 33G. Two support ribs 33G are arranged on the left side of the center of the cylindrical portion 33A in the left-right direction. Two support ribs 33G are arranged on the right side of the center of the cylindrical portion 33A in the left-right direction. The two left support ribs 33G are arranged at intervals in the front-rear direction. The two right support ribs 33G are arranged at intervals in the front-rear direction. The left support ribs 33G support the left region of the lower surface of the main body portion 31A. The right support ribs 33G support the right region of the lower surface of the main body portion 31A.

[0210] The support ribs 33H protrude upward from the upper surface of the bottom portion 33B. Two support ribs 33H are provided at intervals in the left-right direction at the rear portion of the bottom portion 33B. Recesses 33I provided at the upper portions of the support ribs 33H support the pivoting portion 32C of the second hook member 32. The support ribs 33H support the second hook member 32 to be pivotable. The second hook member 32 is pivotable about the pivot axis CX in a state of being supported by the support ribs 33H.

[0211] The support rib 33J protrudes upward from the upper surface of the bottom portion 33B. The support rib 33J is disposed at a position facing the base portion 31G of the first hook member 31.

[0212] The slide portions 67 are provided on the outer surface of the cylindrical portion 33A. The slide portions 67 are disposed below the first supported surfaces 65. The slide portions 67 are disposed between respective pairs of first hook holes 33E. The slide portions 67 each includes a pair of vertical ribs 67A provided on the outer surface of the cylindrical portion 33A. The vertical ribs 67A are provided so as to extend in the up-down direction. When the hook cover 33 is inserted into the opening 59 of the guard portion 4, the guide portion 63 or the guide portion 64 provided on the guard portion 4 guides the slide portions 67.

[0213] The biasing member 68 biases the hook member 30 such that the hook member 30 approaches the guard portion 4. The biasing member 68 performs biasing such that the first hook portions 31B of the first hook member 31 approach the first hooked portions of the cover 55 of the guard portion 4 and the second hook portions 32B of the second hook member 32 approach the second hooked portions of the cover 55 of the guard portion 4. That is, the biasing member 68 performs biasing such that the first hook portions 31B and the second hook portions 32B move to the engagement positions.

[0214] The biasing member 68 is disposed between the first hook member 31 and at least a part of the hook cover 33 that supports the first hook member 31 to be movable. In the embodiment, the biasing member 68 is disposed between the front surface of the support rib 33J of the hook cover 33 and the rear surface of the base portion 31G of the first hook member 31. The biasing member 68 is a coil spring. The front end of the biasing member 68 is connected to the base portion 31G of the first hook member 31. The rear end of the biasing member 68 is connected to the support rib 33J of the hook cover 33. A protrusion 31H is provided on the rear surface of the base portion 31G. The protrusion 31H is inserted into the front end of the biasing member 68. The protrusion 31H positions the front end of the biasing member 68.

[0215] The biasing member 68 biases the first hook member 31 such that the first hook member 31 approaches the guard portion 4. The first hook member 31 and the second hook member 32 are connected via the insertion portions 32D. The biasing member 68 biases the second hook member 32 via the first hook member 31 such that the second hook member 32 approaches the guard portion 4.

[0216] In a state in which the hook cover 33 is inserted into the opening 59 of the guard portion 4, when the first hook member 31 and the second hook member 32 are biased by the biasing member 68, an engaged state is established in which the first hook portions 31B of the first hook member 31 and the second hook portions 32B of the second hook member 32 are hooked on the guard portion 4.

[0217] In a state in which the hook cover 33 being inserted into the opening 59 of the guard portion 4, when the operation button portion 31C provided on the first hook member 31 is operated against biasing force of the biasing member 68 with, a released state is established in which the first hook portions 31B and the second hook portions 32B are separated from the guard portion 4.

[0218] FIG. 44 illustrates the attaching/detaching mechanism 11 according to the first embodiment as viewed from the upper-left front. FIG. 45 illustrates the attaching/detaching mechanism 11 according to the first embodiment as viewed from the upper-right rear. FIG. 46 illustrates the attaching/detaching mechanism 11 according to the first embodiment as viewed from above. FIG. 47 is a cross-sectional view illustrating the attaching/detaching mechanism 11 according to the first embodiment.

[0219] FIGS. 44 to 47 illustrate the attaching/detaching mechanism 11 in the released state.

[0220] In order to bring the attaching/detaching mechanism 11 from the engaged state to the released state, the user pushes the operation button portion 31C rearward. When the operation button portion 31C is pushed rearward, the first hook member 31 moves rearward against the biasing force of the biasing member 68. When the first hook member 31 moves rearward, the first hook portions 31B move rearward. That is, the first hook portions 31B move from the engagement positions to the release positions. The first hook portions 31B that have moved to the release positions are released from the first hooked portions provided on the cover 55 of the guard portion 4.

[0221] When the first hook member 31 moves rearward, the connecting holes 31D, into which the insertion portions 32D are inserted, move rearward. The insertion portions 32D are pushed rearward by the inner surfaces of the connecting holes 31D. When the insertion portions 32D move rearward, the second hook member 32 rotates about the pivoting portion 32C. The insertion portions 32D are arranged upward of the pivoting portion 32C. The second hook portions 32B are arranged downward of the pivoting portion 32C. When the insertion portions 32D move rearward and the second hook member 32 pivots about the pivoting portion 32C, the second hook portions 32B move forward. That is, the second hook portions 32B move from the engagement positions to the release positions. The second hook portions 32B that have moved to the release positions are released from the second hooked portions provided on the cover 55 of the guard portion 4.

[0222] As described above, in order to bring the attaching/detaching mechanism 11 from the engaged state to the released state, the operation button portion 31C is only pushed rearward to separate the first hook portions 31B and the second hook portions 32B from the guard portion 4. The attaching/detaching mechanism 11 thereby transitions from the engaged state to the released state.

[0223] To attach the guard portion 4 to the drive assembly 2 in a state in which the drive assembly 2 is separated from the guard portion 4, the user inserts the drive assembly 2 into the opening of the guard portion 4. When the hook cover 33 is inserted into the opening 59, the first hook portions 31B and the second hook portions 32B are pushed against the inner surface of the cover 55. That is, when pushed against the inner surface of the cover 55, the first hook portions 31B and the second hook portions 32B move from the engagement positions to the release positions against the biasing force of the biasing member 68. When the hook cover 33 is sufficiently inserted into the opening 59 and reaches a specified position, the first hook portions 31B and the second hook portions 32B face the hooked portions (first hooked portions and second hooked portions) provided on the inner surface of the cover 55. When the first hook portions 31B and the second hook portions 32B face the hooked portions, the first hook portions 31B and the second hook portions 32B are moved from the release positions to the engagement positions by the biasing force of the biasing member 68. When the first hook portions 31B and the second hook portions 32B are hooked on the hooked portions, the drive assembly 2 and the guard portion 4 are fixed to each other.

[0224] Note that, for example, when the first hook member 31 and the second hook member 32 are not properly connected with each other or when the hook cover 33 does not properly support at least one of the first hook member 31 and the second hook member 32, the protrusions 32E of the second hook member 32 are not inserted into the release holes 31E of the first hook member 31, and the protrusions 32E lift the first hook member 31. Therefore, for example, the hook cover 33 is prevented from being fixed to the gear case 29 in a state in which the first hook member 31 and the second hook member 32 are not properly connected with each other or in a state in which the hook cover 33 does not properly support at least one of the first hook member 31 and the second hook member 32.

Adjustment Mechanism

[0225] FIG. 48 is an exploded view illustrating the adjustment mechanism 12 according to the first embodiment as viewed from the upper-right front. FIG. 49 illustrates the front portion of the scrubber 1 according to the first embodiment as viewed from the upper-right front.

[0226] The adjustment mechanism 12 adjusts the height of the guard portion 4 with respect to the drive assembly 2 according to the attachment position of the drive assembly 2 with respect to the guard portion 4. The adjustment mechanism 12 adjusts the height of the guard portion 4 to a first height and a second height.

[0227] In the embodiment, the attachment position of the drive assembly 2 with respect to the guard portion 4 includes the attachment position in the circumferential direction of the motor rotation axis AX. When the drive assembly 2 is attached at a first attachment position of the guard portion 4 in the circumferential direction, the guard portion 4 is adjusted to the first height. When the drive assembly 2 is attached at a second attachment position of the guard portion 4 in the circumferential direction, the guard portion 4 is adjusted to the second height.

[0228] FIG. 16 illustrates a state in which the guard portion 4 is adjusted to the first height. FIG. 49 illustrates a state in which the guard portion 4 is adjusted to the second height.

[0229] The adjustment mechanism 12 is provided on one or both of the guard portion 4 and the drive assembly 2. In the embodiment, the adjustment mechanism 12 includes: a first adjustment portion 121 provided on the guard portion 4; and a second adjustment portion 122 provided on the drive assembly 2. The first adjustment portion 121 has the upper surface of the protruding portion 60. The second adjustment portion 122 has the lower surface of the flange portion 33C.

[0230] The first adjustment portion 121 has the first support surfaces 61 and the second support surfaces 62. The first support surfaces 61 support the second adjustment portion 122. The second support surfaces 62 are disposed at positions different from those of the first support surfaces 61 in the circumferential direction, and have heights different from those of the first support surfaces 61. The second support surfaces 62 are disposed at positions lower than those of the first support surfaces 61. The first support surfaces 61 and the second support surfaces 62 are disposed around the opening 59 of the guard portion 4. The first support surfaces 61 and the second support surfaces 62 are provided on the upper surface of the protruding portion 60 disposed around the opening 59.

[0231] The second adjustment portion 122 has the first supported surfaces 65 and the second supported surfaces 66. The first adjustment portion 121 supports the first supported surfaces 65. The second supported surfaces 66 are disposed at positions different from those of the first supported surfaces 65 in the circumferential direction, and have heights different from those of the first supported surfaces 65. The second supported surfaces 66 are disposed at positions higher than those of the first supported surfaces 65. The first supported surfaces 65 and the second supported surfaces 66 are provided at the upper end of the hook cover 33. The first supported surfaces 65 and the second supported surfaces 66 are provided on the lower surface of the flange portion 33C provided at the upper end of the hook cover 33.

[0232] As illustrated in FIG. 16, in a case where the guard portion 4 is adjusted to the first height, the attachment position of the drive assembly 2 in the circumferential direction with respect to the guard portion 4 is determined so that the second supported surfaces 66 face the second support surfaces 62 with the first supported surfaces 65 being supported by the first support surfaces 61. In a case where the drive assembly 2 is inserted into the opening 59 such that the guard portion 4 is located at the first height, the guide portion 63 guides the slide portions 67. The guide portion 63 is provided so as to be connected to the first support surfaces 61.

[0233] As illustrated in FIG. 48, in a case where the guard portion 4 is caused to transition from the first height to the second height, the user releases the guard portion 4 from the drive assembly 2, rotates the guard portion 4 by 90 degrees, and then inserts the drive assembly 2 into the opening 59 of the guard portion 4.

[0234] As illustrated in FIG. 49, in a case where the guard portion 4 is adjusted to the second height, the attachment position of the drive assembly 2 in the circumferential direction with respect to the guard portion 4 is determined so that the second supported surfaces 66 face the first support surfaces 61 with the first supported surfaces 65 being supported by the second support surfaces 62. In a case where the drive assembly 2 is inserted into the opening 59 such that the guard portion 4 is placed at the second height, the guide portion 64 guides the slide portions 67. The guide portion 64 is provided so as to be connected to the second support surfaces 62.

[0235] FIG. 50 illustrates the guard portion 4 having heights adjusted by the adjustment mechanism 12 according to the first embodiment. In FIG. 50, the guard portion 4 of the left scrubber 1 is adjusted to a first height H1, and the guard portion 4 of the right scrubber 1 is adjusted to a second height H2. In FIG. 50, the heights (first height H1 and second height H2) of the guard portion 4 indicate the distances in the up-down direction between the lower end of the head housing 13 and the upper surface of the guard portion 4. Note that the heights of guard portion 4 may be distances in the up-down direction between the surface of the cleaning target and the lower end of the guard portion 4.

[0236] As described above, the brush support 53 and the brush 52 are connected to the cover 55 via the floating mechanism 57. The brush support 53 and the brush 52 is movable in the up-down direction with respect to the cover 55. A difference H between the first height H1 and the second height H2 is determined as a movable distance of the brush support 53 and the brush 52 in the up-down direction. As described above, the movable distance of the brush support 53 and the brush 52 in the up-down direction is, for example, 7 mm. The difference H between the first height H1 and the second height H2 is, for example, 7 mm.

Operation

[0237] Next, the operation of the scrubber 1 will be described. The user grips the front grip 8 with one hand, and grips the grip portion 16B with the other hand. When the user operates the trigger lever 17 with the drive assembly 2 being attached to the guard portion 4, the motor 14 is driven, and the tool 3 rotates. When the tool 3 rotates with the brush 48 being in contact with the cleaning target, the cleaning target is cleaned. When the tool 3 rotates with cleaning liquid being sprinkled on the cleaning target, the cleaning liquid may scatter around the tool 3. The guard portion 4 disposed around the tool 3 inhibits the scattering of the cleaning liquid.

[0238] The drive assembly 2 and the pole 6 are connected to each other via the pivoting portion 10. The pole 6 and the main body assembly 5 can be adjusted to any angle with the tool 3 and the guard portion 4 being in contact with the cleaning target, so that the user can perform cleaning work with good workability.

[0239] When the tool 3 comes in partial contact with the cleaning target while rotating, the scrubber 1 may be shaken. The cover 55, to which the drive assembly 2 is attached, and the brush support 53 are connected via a floating mechanism 57. Even when the scrubber 1 is about to be shaken, the brush 52 attached to the brush support 53 can continue to be in contact with the cleaning target, which inhibits the scrubber 1 from being shaken.

[0240] Wear and deformation of the brush 48 may change the height of the lower end of the brush 48 that comes in contact with the cleaning target. In order to inhibit the scrubber 1 from being shaken, that is, in order to always bring the brush 52 of the guard portion 4 into contact with the cleaning target, the lower end of the brush 52 of the guard portion 4 is preferably disposed at a position lower than that of the lower end of the brush 48 of the tool 3. In the embodiment, the adjustment mechanism 12 that adjusts the height of the guard portion 4 is provided. When the height of the lower end of the brush 48 is changed by wear and deformation of the brush 48, the user can adjust the height of the guard portion 4 in accordance with the height of the lower end of the brush 48 so that the brush 52 of the guard portion 4 is always in contact with the cleaning target.

[0241] The difference H between the first height H1 and the second height H2 is determined as a movable distance of the brush support 53 in the up-down direction. This enables the brush 52 of the guard portion 4 to come in contact with the cleaning target even when the height of the lower end of the brush 48 changes.

[0242] To change the height of the guard portion 4 or to perform the maintenance for the guard portion 4, the guard portion 4 needs to be released from the drive assembly 2. The user can easily release the guard portion 4 from the drive assembly 2 only by operating the operation button portion 31C. The user can release the guard portion 4 from the drive assembly 2 in a single touch. Furthermore, when attaching the guard portion 4 to the drive assembly 2, the user can easily attach the guard portion 4 to the drive assembly 2 only by inserting the drive assembly 2 into the opening 59 of the guard portion 4. The user can attach the guard portion 4 to the drive assembly 2 in a single touch.

Effects

[0243] As described above, in the embodiment, the scrubber 1 includes: the drive assembly 2 that includes the motor 14 that rotates about the motor rotation axis AX extending in the up-down direction; the tool 3 that faces the cleaning target and is rotated by the motor 14; the guard portion 4 that is disposed at least partially around the tool 3; and the attaching/detaching mechanism 11 that includes the hook member 30 and is configured to attach and detach the drive assembly 2 and the guard portion 4 to and from each other.

[0244] In the above-described configuration, the guard portion 4 of the scrubber 1 can be smoothly attached and detached by the attaching/detaching mechanism 11 including the hook member 30.

[0245] In the embodiment, the attaching/detaching mechanism 11 is provided on one or both of the drive assembly 2 and the guard portion 4.

[0246] In the above-described configuration, the attaching/detaching mechanism 11 is provided on one or both of the drive assembly 2 and the guard portion 4, which inhibits an increase in size of the scrubber 1.

[0247] In the embodiment, the hook member 30 is movably supported by the drive assembly 2.

[0248] In the above-described configuration, the guard portion 4 of the scrubber 1 can be smoothly attached and detached by the hook member 30 movably supported by the drive assembly 2.

[0249] In the embodiment, the hook member 30 includes: the first hook member 31; and the second hook member 32 that is connected to at least a part of the first hook member 31 and that moves in synchronization with the first hook member 31.

[0250] In the above-described configuration, the second hook member 32 moves in synchronization with the first hook member 31 by operating the first hook member 31, so that the guard portion 4 of the scrubber 1 can be attached and detached with good operability.

[0251] In the embodiment, the first hook member 31 includes: the main body portion 31A disposed around the rotation shaft 41 that connects the motor 14 with the tool 3; and the first hook portions 31B disposed below the front portion of the main body portion 31A and hooked on the guard portion 4.

[0252] In the above-described configuration, the main body portion 31A is disposed around the rotation shaft 41, which inhibits an increase in size of the attaching/detaching mechanism 11. The guard portion 4 of the scrubber 1 can be smoothly attached and detached by the first hook member 31.

[0253] In the embodiment, the first hook member 31 includes the operation button portion 31C that is provided on the front portion of the main body portion 31A and that protrudes forward from the head housing 13 of the drive assembly 2.

[0254] In the above-described configuration, the guard portion 4 of scrubber 1 can be easily attached and detached only by operating the operation button portion 31C.

[0255] In the embodiment, the first hook member 31 has the connecting holes 31D which are provided at the rear portion of the main body portion 31A and into which at least a part of the second hook member 32 is inserted.

[0256] In the above-described configuration, the first hook member 31 and the second hook member 32 are connected via the connecting holes 31D.

[0257] In the embodiment, the second hook member 32 includes: the insertion portions 32D are inserted into the connecting holes 31D; and the second hook portions 32B that are disposed below the insertion portions 32D and that are hooked on the guard portion 4.

[0258] In the above-described configuration, the first hook member 31 and the second hook member 32 are connected via the connecting holes 31D and the insertion portions 32D to be inserted into the connecting holes 31D. The guard portion 4 of the scrubber 1 can be smoothly attached and detached by the second hook member 32.

[0259] In the embodiment, the second hook member 32 includes the pivoting portion 32C disposed between the insertion portions 32D and the second hook portion 32B in the up-down direction.

[0260] In the above-described configuration, when the first hook member 31 moves in the front-rear direction, the second hook member 32 pivots, so that the second hook portions can be moved.

[0261] In the embodiment, when viewed from above, the extension line of the pivot axis CX of the pivoting portion 32C passes the upper surface of the second hook portions 32B.

[0262] In the above-described configuration, force by which the guard portion 4 is about to be released from the drive assembly 2 inhibits the second hook member 32 from pivoting.

[0263] In the embodiment, the drive assembly 2 includes the hook cover 33 to be inserted into the opening 59 provided in the guard portion 4. The hook cover 33 supports the first hook member 31 and the second hook member 32.

[0264] In the above-described configuration, the hook cover 33 to be inserted into the opening 59 of the guard portion 4 supports the first hook member 31 and the second hook member 32, so that the guard portion 4 of the scrubber 1 can be smoothly attached and detached.

[0265] In the embodiment, the hook cover 33 includes: the cylindrical portion 33A to be inserted into the opening 59; and the slide portions 67 provided on the outer surface of the cylindrical portion 33A and guided by the guide portion 63 or the guide portion 64 provided on the guard portion 4.

[0266] In the above-described configuration, the hook cover 33 is guided by the guide portion 63 or the guide portion 64 guides, so that the hook cover 33 can be smoothly inserted into the opening 59.

[0267] In the embodiment, the cylindrical portion 33A includes: the first hook holes 33E in which the first hook portions 31B of the first hook member are movably disposed; and the second hook holes 33F in which the second hook portions 32B of the second hook member 32 are movably disposed.

[0268] In the above-described configuration, the first hook portions 31B can move between the engagement positions and the release positions in a state of being supported by the hook cover 33. The second hook portions 32B can move between the engagement positions and the release positions in a state of being supported by the hook cover 33.

[0269] In the embodiment, the attaching/detaching mechanism 11 includes the biasing member 68 that biases the hook member 30 such that the hook member 30 approaches the guard portion 4.

[0270] In the above-described configuration, the hook member 30 and the guard portion 4 are stably engaged with each other.

[0271] In the embodiment, the hook member 30 includes: the first hook member 31; and the second hook member 32 that is connected to at least a part of the first hook member 31 and that moves in synchronization with the first hook member 31. The biasing member 68 is disposed between the first hook member 31 and at least a part of the hook cover 33 that supports the first hook member 31 to be movable. The biasing member 68 biases the first hook member 31 such that the first hook member 31 approaches the guard portion 4. The biasing member 68 biases the second hook member 32 via the first hook member 31 such that the second hook member 32 approaches the guard portion 4.

[0272] In the above-described configuration, the hook member 30 and the guard portion 4 are stably engaged with each other. Furthermore, the second hook member 32 moves in synchronization with the first hook member 31 by operating the first hook member 31, so that the guard portion 4 of the scrubber 1 can be attached and detached with good operability.

[0273] In the embodiment, the drive assembly 2 includes the hook cover 33 to be inserted into the opening 59 provided in the guard portion 4. The hook cover 33 may support the hook member 30 to be movable. When the biasing member 68 biases the first hook member 31 and the second hook member 32 with the hook cover 33 being inserted into the opening 59, an engaged state is established in which the first hook portions 31B of the first hook member 31 and the second hook portions 32B of the second hook member 32 are hooked on the guard portion 4. When the operation button portion 31C provided on the first hook member 31 is operated against the biasing force of the biasing member 68, a released state is established in which the first hook portions 31B and the second hook portions 32B are separated from the guard portion 4.

[0274] In the above-described configuration, the user of the scrubber 1 can attach and detach the guard portion 4 with a single touch.

Second Embodiment

[0275] A second embodiment will be described. In the following description, the same or equivalent components as or to those of the above-described embodiment are denoted by the same reference signs, and the description of the components is simplified or omitted.

[0276] FIG. 51 illustrates an attaching/detaching mechanism 111 according to the second embodiment as viewed from the upper-left front. FIG. 52 illustrates the attaching/detaching mechanism 111 according to the second embodiment as viewed from the upper-right rear. FIG. 53 illustrates the attaching/detaching mechanism 111 according to the second embodiment as viewed from above. FIG. 54 illustrates the attaching/detaching mechanism 111 in an engaged state and a released state according to the second embodiment as viewed from above. FIG. 55 illustrates the attaching/detaching mechanism 111 in the engaged state and the released state according to the second embodiment as viewed from the right.

[0277] In the above-described first embodiment, an example has been described in which, when the operation button portion 31C of the first hook member 31 is operated, the second hook member 32 is interlocked with the first hook member 31. In the second embodiment, an example will be described in which a first hook member 131 and a second hook member 132 move independently.

[0278] A hook cover 133 movably supports the first hook member 131 and the second hook member 132 in the front-rear direction. The second hook member 132 is disposed behind the first hook member 131. The first hook member 131 includes two first hook portions 131B. The second hook member 132 includes two second hook portions 132B. The shape and size of the first hook member 131 are substantially equal to the shape and size of the second hook member 132.

[0279] First hook holes 133E are provided at the front portion of a cylindrical portion of the hook cover 133. The first hook portions 131B are movably disposed in the first hook holes 133E. Second hook holes 133F are provided at the rear portion of the cylindrical portion of the hook cover 133. The second hook portions 132B are movably disposed in the second hook holes 133F.

[0280] The hook cover 133 includes a pair of support ribs 133J. A first biasing member 168 is disposed between the first hook member 131 and one of the support ribs 133J. A second biasing member 168 is disposed between the second hook member 132 and the other of the support ribs 133J. The first biasing member 168 biases the first hook member 131 so that the first hook member 131 approaches the guard portion 4. The second biasing member 168 biases the second hook member 132 so that the second hook member 132 approaches the guard portion 4.

[0281] In the engaged state of the attaching/detaching mechanism 111, the first hook member 131 and the second hook member 132 are disposed at engagement positions by biasing force of the biasing members 168. When the attaching/detaching mechanism 111 transitions from the engaged state to the released state, the user moves the first hook member 131 and the second hook member 132 so that the first hook member 131 and the second hook member 132 approach each other in the front-rear direction. The user can cause the attaching/detaching mechanism 111 to transition from the engaged state to the released state by causing the first hook member 131 and the second hook member 132 to approach each other against the biasing force of the biasing members 168.

Third Embodiment

[0282] A third embodiment will be described. In the following description, the same or equivalent components as or to those of the above-described embodiment are denoted by the same reference signs, and the description of the components is simplified or omitted.

[0283] FIG. 56 illustrates an attaching/detaching mechanism 211 according to the third embodiment as viewed from the upper-left front. FIG. 57 illustrates the attaching/detaching mechanism 211 according to the third embodiment as viewed from the upper-right rear. FIG. 58 illustrates the attaching/detaching mechanism 211 according to the third embodiment as viewed from above. FIG. 59 illustrates the attaching/detaching mechanism 211 in an engaged state and a released state according to the third embodiment as viewed from above. FIG. 60 illustrates the attaching/detaching mechanism 211 in the engaged state and the released state according to the third embodiment as viewed from the right.

[0284] In the above-described first embodiment, the first hook member 31 and the second hook member 32 move in the front-rear direction. In the third embodiment, an example will be described in which a first hook member 231 and a second hook member 232 move in the left-right direction.

[0285] The attaching/detaching mechanism 211 includes an operation member 230, the first hook member 231, and the second hook member 232. A hook cover 233 movably supports the operation member 230 in the front-rear direction. The hook cover 233 movably supports the first hook member 231 and the second hook member 232 in the left-right direction. The second hook member 232 is disposed on the right of the first hook member 231.

[0286] A guide hole 230A is provided at the left portion of the operation member 230. A guide hole 230B is provided at the right portion of the operation member 230. The guide hole 230A is inclined leftward toward the rear. The guide hole 230B is inclined rightward toward the rear.

[0287] The first hook member 231 includes two first hook portions 231B. The second hook member 232 includes two second hook portions 232B. The shape and size of the first hook member 231 are substantially equal to the shape and size of the second hook member 232.

[0288] The first hook member 231 includes a slide portion 231G disposed in the guide hole 230A. The second hook member 232 includes a slide portion 232G disposed in the guide hole 230B.

[0289] First hook holes 233E are provided at the left portion of a cylindrical portion of the hook cover 233. The first hook portions 231B are movably disposed in the first hook holes 233E. Second hook holes 233F are provided at the rear portion of the cylindrical portion of the hook cover 233. The second hook portions 232B are movably disposed in the second hook holes 233F.

[0290] The hook cover 233 includes a pair of support ribs 233J. A first biasing member 268 is disposed between the first hook member 231 and one of the support ribs 233J. A second biasing member 268 is disposed between the second hook member 232 and the other of the support ribs 233J. The first biasing member 268 biases the first hook member 231 so that the first hook member 231 approaches the guard portion 4. The second biasing member 268 biases the second hook member 232 so that the second hook member 232 approaches the guard portion 4.

[0291] In the engaged state of the attaching/detaching mechanism 211, the first hook member 231 and the second hook member 232 are disposed at engagement positions by biasing force of the biasing members 268. In order to bring the attaching/detaching mechanism 211 from the engaged state to the released state, the user moves the operation member 230 rearward. When the operation member 230 moves backward, the slide portion 231G of the first hook member 231 disposed in the guide hole 230A is pushed by the inner surface of the guide hole 230A to move rightward, and the slide portion 232G of the second hook member 232 disposed in the guide hole 230B is pushed by the inner surface of the guide hole 230B to move leftward. When the slide portion 231G of the first hook member 231 disposed in the guide hole 230A moves rightward, the first hook member 231 moves from an engagement position to a release position. When the slide portion 232G of the second hook member 232 disposed in the guide hole 230B moves leftward, the second hook member 232 moves from an engagement position to a release position. This causes the attaching/detaching mechanism 211 to transition from the engaged state to the released state.

Fourth Embodiment

[0292] A fourth embodiment will be described. In the following description, the same or equivalent components as or to those of the above-described embodiment are denoted by the same reference signs, and the description of the components is simplified or omitted.

[0293] FIG. 61 illustrates an adjustment mechanism 112 according to the fourth embodiment as viewed from the upper-right front. FIG. 62 is an exploded view illustrating the adjustment mechanism 112 according to the fourth embodiment as viewed from the upper-right front. FIG. 63 is an exploded view illustrating the adjustment mechanism 112 according to the fourth embodiment as viewed from the upper-right front. FIG. 64 illustrates the adjustment mechanism 112 according to the fourth embodiment as viewed from the upper-right front. FIG. 65 illustrates a guard portion 104 having a height adjusted by the adjustment mechanism 112 according to the fourth embodiment.

[0294] A sleeve 70 is disposed around the lower portion of the drive assembly 2. A screw 71 is provided around the opening of the guard portion 104. When the sleeve 70 is coupled with the screw 71, the guard portion 104 is attached to the drive assembly 2.

[0295] A supported surface 165 is provided on the drive assembly 2. A first support surface 161 and second support surfaces 162 are provided around the opening of the guard portion 104. The second support surfaces 162 are disposed at positions lower than that of the first support surface 161.

[0296] As illustrated in FIG. 61, when the sleeve 70 is coupled with the screw 71 with the supported surface 165 being supported by the first support surface 161, the guard portion 104 is disposed at the first height H1.

[0297] When the guard portion 104 is changed from the first height H1 to the second height H2, the coupling between the sleeve 70 and the screw 71 is released as illustrated in FIG. 62, and then the guard portion 104 is rotated by 90 degrees as illustrated in FIG. 63. After inserting the drive assembly 2 into the opening of the guard portion 104 so that the second support surfaces 162 support the supported surface 165, the sleeve 70 is coupled with the screw 71, whereby the guard portion 104 is disposed at the second height H2 as illustrated in FIG. 64.

Fifth Embodiment

[0298] A fifth embodiment will be described. In the following description, the same or equivalent components as or to those of the above-described embodiment are denoted by the same reference signs, and the description of the components is simplified or omitted.

[0299] FIG. 66 illustrates an adjustment mechanism 212 according to the fifth embodiment as viewed from the upper-right front. FIG. 67 is an exploded view illustrating the adjustment mechanism 212 according to the fifth embodiment as viewed from the upper-right front. FIG. 68 is an exploded view illustrating the adjustment mechanism 212 according to the fifth embodiment as viewed from the upper-right front. FIG. 69 illustrates a guard portion 204 having a height adjusted by the adjustment mechanism 212 according to the fifth embodiment.

[0300] In the above-described first embodiment, an example has been described in which the adjustment mechanism 12 changes the height of the guard portion 4 by changing the attachment position of the drive assembly 2 in the circumferential direction with respect to the guard portion 4. In the fifth embodiment, an example will be described in which the height of the guard portion 204 is changed by changing the attachment position of the drive assembly 2 in the up-down direction with respect to the guard portion 204.

[0301] In the embodiment, the guard portion 204 is divided into a left guard portion 204L and a right guard portion 204R. The rear portion of the left guard portion 204L and the rear portion of the right guard portion 204R are coupled via a hinge mechanism 80. A fixture 81 fixes the front portion of the left guard portion 204L and the front portion of the right guard portion 204R to each other.

[0302] A first groove 265 and a second groove 266 are provided on the outer peripheral surface of the lower portion of the drive assembly 2. The first groove 265 has a first supported surface. The second groove 266 has a second supported surface. The first groove 265 and the second groove 266 are provided so as to surround the motor rotation axis AX. The second groove 266 is disposed at a position higher than that of the first groove 265. A protruding portion is provided on the inner peripheral surface of the opening of the guard portion 204. The protruding portion is inserted into one of the first groove 265 and the second groove 266.

[0303] As illustrated in FIG. 66, when the fixture 81 fixes the front portion of the left guard portion 204L and the front portion of the right guard portion 204R to each other with the protruding portion of the guard portion 204 being inserted into the first groove 265, the guard portion 204 is disposed at the first height H1.

[0304] When the guard portion 204 is changed from the first height H1 to the second height H2, as illustrated in FIG. 67, after the fixing performed by the fixture 81 is released to separate the left guard portion 204L and the right guard portion 204R from each other, the fixture 81 fixes the front portion of the left guard portion 204L and the front portion of the right guard portion 204R to each other so that the protruding portion of the guard portion 204 is inserted into the second groove 266. This causes the guard portion 204 to be disposed at the second height H2 as illustrated in FIG. 68.

[0305] Although the invention has been described with respect to specific embodiments for a complete and clear disclosure, the appended claims are not to be thus limited but are to be construed as embodying all modifications and alternative constructions that may occur to one skilled in the art that fairly fall within the basic teaching herein set forth.