Hand-held machine tool comprising a clamping collar

Abstract

The disclosure relates to a hand-held machine tool, comprising a housing and a drive unit, a gearbox unit which is provided to convert a rotary motion of the drive unit into an oscillating motion and has an output shaft, and a tool holder for fastening at least one tool, said tool holder being drivable in an oscillating manner via the output shaft the gearbox unit. According to the disclosure, the hand-held machine tool comprises a clamping collar, which extends in a circumferential direction at least partially around the output shaft.

Claims

1. Accessory mounting device of a hand-held machine tool, comprising: a fastening unit including a cylindrical clamping ring having a circumference and defining a radial direction extending to and intersecting said circumference; and at least one accessory coupling unit integral with said clamping ring at the intersection of said radial direction and said circumference of said clamping ring and including a holding element for receiving an accessory therethrough in a direction perpendicular to the radial direction at the intersection of said radial direction and said circumference and a fastening element for fastening the accessory to said holding element, wherein the hand-held machine tool includes (i) a housing including a machining-side-facing end in a direction of principal extent of the housing, (ii) a drive unit, (iii) a gearbox unit disposed within said housing and configured to convert a rotary motion of the drive unit into an oscillating motion, the gearbox unit having an output shaft extending perpendicular to the direction of principal extent of the housing, (iv) a tool holder configured to fasten at least one insert tool, and further configured to be driven in an oscillating manner via the output shaft of the gearbox unit, and (v) a cylindrical clamping collar extending from said housing and configured to extend away from the machining-side-facing end and at least partially around the output shaft in a peripheral direction, the clamping collar defining a continuous circumferential groove, wherein the accessory mounting device is configured to be fastened by the fastening unit to the clamping collar of the hand-held machine tool, wherein the clamping ring is sized to be received entirely within said continuous circumferential groove, and wherein the holding element and the fastening element are configured to permit adjustment of the accessory in said direction perpendicular to the radial direction at the intersection of said radial direction and said circumference.

2. Accessory mounting device according to claim 1, wherein the clamping collar, in a longitudinal direction of the output shaft, has a length of at least 3 mm.

3. Accessory mounting device according to claim 1, wherein: the clamping collar has a shell surface profiled in the peripheral direction, and the shell surface is configured to secure the accessory mounting device in a positive-locking manner in the peripheral direction.

4. Accessory mounting device according to claim 1, wherein: the clamping collar has a shell surface which is profiled in a longitudinal direction of the output shaft, and the shell surface is configured to secure the accessory mounting device in a positive-locking manner in the longitudinal direction.

5. Accessory mounting device according to claim 1, wherein the clamping ring is of resiliently elastic configuration.

6. Accessory mounting device according to claim 1, wherein the clamping ring is profiled in a peripheral direction.

7. Accessory mounting device according to claim 1, wherein the clamping ring is open in a radial direction.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Further advantages emerge from the following description of the drawing. In the drawing, two illustrative embodiments of the disclosure are represented. The drawing, the description and the claims contain numerous features in combination. The person skilled in the art will expediently view the features also in isolation and will combine them into sensible further combinations.

(2) FIG. 1 shows a hand-held machine tool in a perspective side view,

(3) FIG. 2 shows a sub-region of the hand-held machine tool in a partially sectioned, schematic representation,

(4) FIG. 3 shows an accessory mounting device in a schematic top view,

(5) FIG. 4 shows a sub-region of the hand-held machine tool in a partially sectioned, schematic representation with the mounting device in a mounted state,

(6) FIG. 5 shows a section along the line V-V in FIG. 4 in a schematic representation, and

(7) FIG. 6 shows a further illustrative embodiment of the mounting device in a mounted state on the hand-held machine tool in a schematic sectional view.

DETAILED DESCRIPTION

(8) FIG. 1 shows a hand-held machine tool, which has a switch 38 for switching the hand-held machine tool on and off, which switch is integrated in a housing 36 of the hand-held machine tool that serves as a handle. At a front, machining-side-facing end 74 of the housing 36 of the hand-held machine tool, a clamping collar 18 extends perpendicular to a direction of principal extent 40 of the hand-held machine tool. The clamping collar 18 is disposed in a peripheral direction 20 around an output shaft 12 of the hand-held machine tool, parallel to the output shaft 12 of the hand-held machine tool. The clamping collar 18 is of circular-cylindrical configuration. A development of a shell surface 24 of the clamping collar 18 is formed by a rectangle. The clamping collar 18 extends from a bottom side 76 of the housing 36, perpendicular to the direction of principal extent 40 of the hand-held machine tool, to a tool holder 14 for the fastening of an insert tool 16. The bottom side 76 of the housing 36 extends at least partially along a plane running perpendicular to an axial direction 22 of the output shaft 12. The bottom side 76 fully encloses the clamping collar 18. The clamping collar 18 is disposed at a distance from an edge 78 by which an end face 80 of the end 74 of the hand-held machine tool passes into the bottom side 76 of the housing 36, in a direction of principal extent 40 of the housing 36 which is facing away from the machining side. The bottom side 76 of the housing 36 of the hand-held machine tool is disposed between an end face 80 of one end 74 of the hand-held machine tool and at least one point of intersection S of a shell surface 24 of the clamping collar 18 and a vector 82 which, starting from a rotational axis 84 of the output shaft 12, runs in the direction of the end face 80 parallel to the principal direction of extent 40 of the hand-held machine tool (FIG. 5).

(9) At one end of the output shaft 12, which end protrudes from the housing 36 of the hand-held machine tool, is disposed the tool holder 14, with the insert tool 16 held therein. The tool holder can be driven in an oscillating manner by means of the output shaft 12 of the gearbox unit. In addition, the hand-held machine tool comprises a drive unit (not represented in detail), formed by an electric motor, and a gearbox unit (not represented in detail). The gearbox unit is designed to convert a rotary motion of the drive unit into an oscillating motion 10. The gearbox unit has the output shaft 12. In a region facing away from the tool holder 16 in the direction of principal extent 40 of the hand-held machine tool, the hand-held machine tool has a power cable 42 for supplying power to the drive unit.

(10) In FIG. 2, the front region of the hand-held machine tool is shown in a partially sectioned representation. The output shaft 12 is mounted rotatably in the housing 36 of the hand-held machine tool by means of a bearing 44. At one end of the output shaft 12, which end protrudes from the housing 36, is arranged the tool holder 14. The tool holder 14 comprises a supporting flange 46. The supporting flange 46 is pressed onto the output shaft 12. In a mounted state of the insert tool 16, the insert tool 16 is held by means of a fastening screw 48 in a non-positive locking manner on the supporting flange 46. The fastening screw 48 extends in the axial direction 22 of the output shaft 12 through an opening 50 in the insert tool 16 and is screwed into a threaded bore (not represented in detail) in the output shaft 12. The fastening screw 48 is supported in a mounted state, in the axial direction 22 on the insert tool 16, by means of a washer 52.

(11) Between the housing 36 of the hand-held machine tool and the tool holder 14, the clamping collar 18 is arranged in the axial direction 22. The clamping collar 18 extends in a peripheral direction 20 fully around the output shaft 12 and is closed in the peripheral direction 20 and is of regular configuration. The clamping collar 18 is formed integrally onto the housing 36 of the hand-held machine tool. The clamping collar 18 has a length in the axial direction 22 of 10 mm. A diameter of the clamping collar 18 substantially corresponds to a diameter of the supporting flange 46. By substantially should be understood, in particular, in this context that a relative difference between the diameters of the clamping collar 18 and of the supporting flange 46 amounts, in particular, to less than 15%, preferably to less than 10%, and particularly preferably to less than 5% of the largest diameter. In addition, the clamping collar 18 has a shell surface 24 which is profiled in the axial direction 22 and which is designed to secure an accessory mounting device in a positive-locking manner in the peripheral direction 20. The profiling of the shell surface 24 is formed by a groove 54, which extends in the peripheral direction 20 of the clamping collar 18.

(12) In FIG. 3, an accessory mounting device, with a thereto fastened accessory element 56 formed by a spacer, is represented. The accessory mounting device is designed to be fastened to the clamping collar 18 of the hand-held machine tool. The accessory mounting device has a fastening unit 26 and an accessory coupling unit 28. The fastening unit 26 comprises a clamping ring 30. The clamping ring 30 is configured open in a radial direction 34 of the clamping ring 30 and has a passage in the radial direction 34. The clamping ring 30 has two clamping extensions 58, which limit the passage of the clamping ring 30 in the peripheral direction 20. The clamping extensions 58 are formed integrally onto a circularly configured fastening region 60 of the clamping ring 30. The clamping extensions 58 extend in the radial direction 34 of the clamping ring 30 outwards from the fastening region 60. The two clamping extensions 58 are arranged parallel to each other. The clamping ring 30 is produced from a metallic material and is of resiliently elastic configuration.

(13) In addition, the accessory mounting device has the accessory coupling unit 28. The accessory coupling unit 28 is disposed on a side of the clamping ring 30 facing away from the clamping extensions 58 and is connected in an integrally bonded manner to the clamping ring 30. The accessory coupling unit 28 is formed by a holding element 62. The holding element 62 has a mounting recess 64, which extends tangentially to a peripheral direction 32 of the clamping ring 30 and perpendicular to the clamping extensions 58. Into the mounting recess 64 of the holding element 62 can be inserted the 64 accessory element 56. The accessory element 62 is then fastened in the holding element 62, in a non-positive and/or positive locking manner, with an accessory fastening screw 66.

(14) FIG. 4 shows the front region of the hand-held machine tool in a partially sectioned representation featuring the accessory mounting device fastened to the clamping collar 18 of the hand-held machine tool and featuring a thereto fastened accessory element 56. In an assembly operation, the clamping ring 30 of the fastening unit 26 of the accessory mounting device is expanded by the user of the hand-held machine tool in the peripheral direction 32 of the clamping ring 30 and, in the axial direction 22 from the tool holder 14 to the housing 36, is slipped onto the clamping collar 18 of the hand-held machine tool. The clamping ring 30 is slid on the clamping collar 18 of the hand-held machine tool in the axial direction 22 towards the housing 36. Once the clamping ring 30 reaches the groove 54, which is recessed in the peripheral direction 20 into the clamping collar 18 of the hand-held machine tool, the clamping ring 30 automatically snaps back into an original shape and engages in the groove 54 of the clamping collar 18. Once the clamping ring 30 is engaged in the groove 54 of the clamping collar 18, the user of the hand-held machine tool can rotate the accessory mounting device in the peripheral direction 20 into a chosen position. Once this position is reached, the user can fasten the clamping ring 30 of the accessory mounting device in the groove 54 of the clamping collar 18 in a non-positively locking manner. To this end, the clamping extensions 58 respectively have an opening 68, through which a user of the hand-held machine tool, in an engaged state of the accessory mounting device, can stick a clamping screw 70 in the axial direction 22. Onto an end of the clamping screw 70, which end is facing away from a screw head of the clamping screw 70, a corresponding clamping nut is now screwed and tightened. The clamping extensions 58 are pressed closer together by means of the clamping screw 70, and the clamping nut corresponding to the clamping screw, tangentially to the peripheral direction 20, 32 of the clamping collar 18 and of the clamping ring 30, so that the clamping ring 30, in the peripheral direction 20, 32, is clamped tightly into the groove 54 of the clamping collar 18 of the hand-held machine tool. A screw clamping joint of the clamping extensions 58 of the clamping ring 30 of the accessory mounting device, which screw clamping joint is formed by the clamping screw 70 and the clamping nut, is represented schematically in FIG. 3. After this, the insert tool is fastened in the tool holder 14.

(15) In FIG. 5, a part of the hand-held machine tool is shown in a sectional view along the line V-V. The clamping collar 18 is disposed at a distance from the machining-side-facing end 74 of the housing 36 in the direction of principal extent 40, facing away from the machining side, of the housing 36. The bottom side 76 of the housing 36 of the hand-held machine tool fully encloses the clamping collar 18 in a region lying on the outside in the radial direction 34. In a region of the clamping collar 18 which lies on the inside in the radial direction 34 is arranged the output shaft 12. The shell surface 24 of the clamping collar 18 runs in the peripheral direction 20 fully around the output shaft 12. The clamping collar 18 runs parallel to the output shaft 12.

(16) The clamping collar 18 is disposed at a distance from the machining-side-facing end 74 of the housing 36 in the direction of principal extent 40, facing away from the machining side, of the housing 36. The bottom side 76 of the housing 36 of the hand-held machine tool fully encloses the clamping collar 18 in a region lying on the outside in the radial direction 34. In a region of the clamping collar 18 which lies on the inside in the radial direction 34 is arranged the output shaft 12. The shell surface 24 of the clamping collar 18 runs in the peripheral direction 20 fully around the output shaft 12. The clamping collar 18 runs parallel to the output shaft 12.

(17) FIG. 6 shows an alternative embodiment of the accessory mounting device with an alternative, thereto fastened accessory element 56. Substantially mutually corresponding components and features are denoted basically with the same reference symbols, wherein, in order to differentiate between the illustrative embodiments, the letter a is in FIG. 6 added to the reference symbols. With respect to constant features and functions, furthermore, reference can be made to the description to the illustrative embodiments in FIGS. 1 to 5. The following description of FIG. 6 is substantially confined to the respective differences from the illustrative embodiment in FIGS. 1 to 5.

(18) In FIG. 6, an alternatively configured accessory mounting device is represented. The accessory mounting device has a fastening unit 26a and an accessory coupling unit 28a. The fastening unit 26a comprises a clamping ring 30a. The clamping ring 30a has a fastening region 60a, which, in a peripheral direction 32a, is polygonally configured. The polygonally configured fastening region 60a of the clamping ring 30a, which fastening region is profiled in the peripheral direction 32a, is fastened in a positive and non-positively locking manner to a likewise polygonal clamping collar 18a of a hand-held machine tool, having an, in the peripheral direction 20a, profiled shell surface 24a, which clamping collar is represented in a sectional representation. In a radially inner region of the clamping collar 18a (shown in sectioned representation) of the hand-held machine tool, an output shaft 12a (likewise shown in sectioned representation) of a gearbox unit (not represented in detail) of the hand-held machine tool is shown. The clamping ring 30a is produced from a metallic material and is of resiliently elastic configuration.

(19) The clamping ring 30a is configured open in a radial direction 34a of the clamping ring 30a. The clamping ring 30a has two clamping extensions 58a. The clamping extensions 58a are formed integrally onto the polygonally configured fastening region 60a of the clamping ring 30a. The clamping extensions 58a extend in the radial direction 34a of the clamping ring 30a outwards from the fastening region 60a. The clamping extensions 58a of the clamping ring 30a, in a first region facing the fastening region 60a of the clamping ring 30a, run parallel to each other. In a second region of the clamping extensions 58a, which region faces away from the fastening region 60a of the clamping ring 30a, the clamping extensions 58a run, diverging from each other, outwards in a curved line. This second region of the clamping extensions 58a forms a guide region 72a. In an assembly operation, the clamping ring 30a of the fastening unit 26a of the accessory mounting device can be slipped onto the clamping collar 18a of the hand-held machine tool in the radial direction 34a. A force in the radial direction 34a, which force is applied by a user, is diverted into a force running tangentially to a peripheral direction 20a. This force running tangentially to a peripheral direction 20a effects a resiliently elastic deflection of the clamping extensions 58a, and thus an expansion of the clamping ring 30a in the peripheral direction 32a. Extending through the first, mutually parallel running regions of the clamping extensions 58a, in a mounted state of the accessory mounting device on the clamping collar 18a of the hand-held machine tool, is a screw clamping joint (here represented schematically). By means of the screw clamping joint, the user can secure the clamping ring 30a of the accessory mounting device in a non-positive locking manner to the clamping collar 18a of the hand-held machine tool.

(20) The accessory mounting device further has an accessory coupling unit 28a. The accessory coupling unit 28a is disposed on a side of the clamping ring 30a that is facing away from the clamping extensions 58a and is connected in an integrally bonded manner to the clamping ring 30a. The accessory coupling unit 28a has a holding element 62a. The holding element 62a has a mounting recess 64a, which extends tangentially to the peripheral direction 32a of the clamping ring 30a and perpendicular to the clamping extensions 58a. Into the mounting recess 64a can be inserted an accessory element 56a, which is here alternatively formed by a guide slide. The accessory element 56a is then fastened in a non-positive locking manner in the holding element 62a with an accessory fastening screw 66a.