Abstract
A hand-held power tool, in particular an angle-grinding machine, includes a housing, a switching unit, a motor, and at least one first pivot unit and one second pivot unit. The switching unit includes a ratchet element arranged on the housing. The first and second pivot units are configured to mount the ratchet element on the housing so as to be movable. Each of the first and the second pivot units includes at least one housing-side bearing unit and one ratchet-side bearing unit. The hand-held power tool further includes a coupling unit configured to couple the first pivot unit with the one second pivot unit.
Claims
1. A hand-held power tool, comprising: a housing; a switching unit including a ratchet element arranged on the housing; a motor; at least one first pivot unit and one second pivot unit, the first and second pivot units configured to mount the ratchet element on the housing of the hand-held power tool so as to be movable; and a coupling unit configured to couple the first pivot unit with the second pivot unit, wherein each of the first and the second pivot units includes at least one housing-side bearing unit and one ratchet-side bearing unit.
2. The hand-held power tool according to claim 1, wherein: each of the first and the second pivot units includes a first arm configured to connect the housing-side bearing unit to the ratchet-side bearing unit, and the first arm of the first pivot unit and the first arm of the second pivot unit are configured such that first arm of the first pivot unit is always moved parallel to the first arm of the second pivot unit.
3. The hand-held power tool according to claim 1, wherein: each of the first and the second pivot units includes one second arm configured to connect the housing-side bearing unit to a further bearing unit, and the further bearing unit is configured to mount the coupling unit on the first and the second pivot units.
4. The hand-held power tool according to claim 1, wherein: an axial extent of the coupling unit corresponds to a distance between the housing-side bearing unit of the first pivot unit and the housing-side bearing unit of the second pivot unit.
5. The hand-held power tool according to claim 1, wherein: the coupling unit is one of: a rod element, a plastics material part, and a sheet metal bending part.
6. The hand-held power tool according to claim 1, wherein: the first and the second pivot units are rotatably mounted such that rotational movement of the first pivot unit follows rotational movement of the second pivot unit.
7. The hand-held power tool according to claim 1, wherein: at least one of the housing-side bearing units and/or at least one of the ratchet-side bearing unit of the first pivot unit and/or the second pivot unit includes a linear guide.
8. The hand-held power tool according to claim 1, wherein: the first pivot unit is spaced from the second pivot unit by at least a length of 25% of an axial extent of the ratchet element.
9. The hand-held power tool according to claim 1, wherein: in at least one state of the hand-held power tool, a switching element of the switching unit is actuated in a translatory manner by the ratchet element.
10. The hand-held power tool according to claim 1, wherein: the coupling unit includes a toothed wheel element.
11. The hand-held power tool according to claim 10, wherein: an angle between the first arm of the first pivot unit and a radial axis of the hand-held power tool is configured to be set to a value of between 60° and 120°.
12. The hand-held power tool according to claim 1, wherein: the coupling unit is a scissors lifting unit.
13. The hand-held power tool according to claim 12, wherein: an angle between the first arm of the first pivot unit and an axial axis of the hand-held power tool is configured to be set to a value of between 0° and 30°.
14. The hand-held power tool according to claim 1, further comprising: a resetting element configured to provide a resetting force in opposition to an actuating direction of the ratchet element, wherein the resetting element is arranged on at least one of the first pivot unit and the second pivot unit.
15. The hand-held power tool according to claim 14, wherein: the first and the second pivot units form one structural unit with the coupling unit and with the resetting element.
16. The hand-held power tool according to claim 1, wherein: the first and the second pivot units are rotatably mounted such that rotational movement of the first pivot is effected in an opposite direction as rotational movement of the second pivot unit.
17. The hand-held power tool according to claim 1, wherein: in at least one state of the hand-held power tool, a switching element of the switching unit is actuated in a rotational manner by at least one of the first pivot unit and the second pivot unit.
18. The hand-held power tool according to claim 11, wherein: the value is between 70° and 110°.
19. The hand-held power tool according to claim 13, wherein: the value is between 0° and 20°.
20. The hand-held power tool according to claim 14, wherein: the resetting element is a leg spring.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0033] Further advantages are produced from the following description of the drawings. Exemplary embodiments of the disclosure are shown in the drawings. The drawing, and the description include numerous features in combination. The person skilled in the art will also look expediently at the features individually and form them into sensible further combinations.
[0034] The drawings are as follows:
[0035] FIG. 1: shows a perspective view of a hand-held power tool,
[0036] FIG. 2: shows a longitudinal section of a hand-held power tool with a ratchet element in the non-actuated state,
[0037] FIG. 2a: shows an enlarged detail of the hand-held power tool according to FIG. 2,
[0038] FIG. 3: shows a longitudinal section of a hand-held power tool according to FIG. 2 with a ratchet element in the actuated state,
[0039] FIG. 4: shows a perspective view of a rod element,
[0040] FIG. 5: shows a perspective view of a ratchet element with a first and a second pivot unit, which units are connected together by means of a coupling unit,
[0041] FIG. 6: shows a perspective view of a resetting unit,
[0042] FIG. 7: shows a schematic part view of a hand-held power tool with a resetting element,
[0043] FIG. 8: shows a perspective view of a ratchet element with a first and a second pivot unit, which units are connected together by means of an alternative embodiment of a coupling unit,
[0044] FIG. 9: shows a schematic view of a hand-held power tool with an alternative embodiment of the coupling unit in the non-actuated state,
[0045] FIG. 10: shows a schematic part view of a hand-held power tool according to FIG. 9 with an alternative embodiment of the coupling unit in the actuated state,
[0046] FIG. 11: shows a schematic part view of a further alternative embodiment of the coupling unit in the non-actuated state,
[0047] FIG. 12: shows a schematic part view of a further alternative embodiment of the coupling unit according to FIG. 11 in the actuated state,
[0048] FIG. 13: shows a schematic part view of a fourth alternative embodiment of the coupling unit in the non-actuated state,
[0049] FIG. 14: shows a schematic part view of a fourth alternative embodiment of the coupling unit according to FIG. 13 in the non-actuated state,
[0050] FIG. 15: shows a top view of a bottom surface of a hand-held power tool with a ratchet element.
DETAILED DESCRIPTION
[0051] FIG. 1 shows a perspective view of a hand-held power tool 10 with a ratchet element 102. A longitudinal section of the hand-held power tool is shown in FIG. 2. The hand-held power tool 10 is realized, as an example, as an angle-grinding machine. The hand-held power tool 10 comprises a housing 12 which includes a gear head 20, a motor housing 30 and a handle housing 40. The gear head 20 can be produced from a metal and is fastened on the motor housing 30 by way of screws 21. An additional handle 23 is arranged, as an example, on the gear head 20. A receiving flange 22, on which a protective cover 24 is rotatably fastenable, is arranged on the bottom surface of the gear head 20. The receiving flange 22 comprises a central opening, through which an output spindle 26 is guided. The output spindle 26 is rotatably connectable or rather couplable with an insertion tool of the hand-held power tool 10, for example a cutting disk. The hand-held power tool 10 comprises an output side, the output spindle 26 emerging out of the housing 12 of the hand-held power tool 10 on the output side of the hand-held power tool 10.
[0052] The motor housing 30 includes, as an example, two portions. The first portion of the motor housing 30 is realized in the manner of a hollow cylinder. In particular, an electric motor 32 is arranged in the first portion of the motor housing 30. The first portion of the motor housing 30 is loosely connected to the gear head 20 on a first connecting region 31. A fan 34, which is realized for the purpose of generating a cooling air flow for cooling the electric motor 32, is arranged on the motor-housing-side in the first connecting region 31 of the motor housing 30. The electric motor 32 includes a drive shaft 38 which is coupled with the output spindle 26 by means of a crown wheel 28. The drive shaft 38 extends along the axial axis 1 of the hand-held power tool 10. In particular, the rotational axis of the drive shaft 38 corresponds to the axial axis 1 of the hand-held power tool 10. In the second connecting region 39 of the motor housing 30, the outside contour of the motor housing 30 merges into the outside contour of the handle housing 40. The handle housing 40 is realized as a housing cover or rather in a pot-shaped manner The handle housing 40 comprises lateral air inlet openings 45, through which the cooling air is able to enter into the housing 12 of the hand-held power tool 10. As an example, the handle housing 40 includes two housing half-shells which can be fastened together and to the motor housing by means of a fastening element, as an example screws. The second portion of the motor housing 30 is realized as a continuation which is encased by the handle housing 40. The second portion of the motor housing 30 is provided for the bearing arrangement or receiving of hand-held power tool components, in particular, the electronics 46, the switching unit 100 and the power supply unit 42. The hand-held power tool 10 is shown in the form of a mains-operated hand-held power tool which comprises a mains cable 44 for the power supply on the rear end 41 of the hand-held power tool 10. However, it is also conceivable for the power supply unit 42 to comprise a rechargeable battery pack interface which is connectable mechanically and electrically to a rechargeable battery pack interface of a rechargeable battery pack. A rechargeable battery pack is to be understood, in this case, as one or several battery cells which are connected together and are arranged in a housing. The housing of the rechargeable battery pack, in this case, comprises a rechargeable battery pack interface on its outside surface.
[0053] The switching unit 100 of the hand-held power tool 10 includes a ratchet element 102 and a switching element 104. The ratchet element 102 is arranged at least in part in a recess of the motor housing 30 and of the handle housing 40. The ratchet element 102 forms at least in part the outside contour 13 of the housing 12 of the hand-held power tool 10. The ratchet element 102 comprises a control surface 103, which is actuated by a user, in particular, by the fingertips of a hand of the user, for actuating the ratchet element 102. The transition from the outside contour 13 of the motor housing 30 to the outside contour 103 of the ratchet element 102, in particular of the control surface 103 of the ratchet element 102, is realized as a step. In an advantageous manner, the control surface 103 of the ratchet element 103 is realized so as to be identifiable by the hand of a user when it touches the step.
[0054] The ratchet element 102 is connected by means of a first pivot unit 110 and a second pivot unit 130 to the housing 12, in particular to the motor housing 30, of the hand-held power tool 10 so as to be movable.
[0055] The first and the second pivot units 110, 130 are connected to the housing 12, in particular to the motor housing 30, of the hand-held power tool in each case by means of a housing-side bearing unit 112, 113. The housing-side bearing unit 112, 132 comprises, as an example, a receiving bore 113, 133 which is provided for receiving a bolt or a pin 111, 131. The pin 111, 131 forms a housing-side rotational axis 114, 134 about which the first and the second pivot units 110, 130 are mounted in each case so as to be rotatable relative to the housing 12 of the hand-held power tool 10.
[0056] The first and the second pivot units 110, 130 are connected to the ratchet element 102 in each case by means of a ratchet-side bearing unit 118, 138. The ratchet-side bearing unit 118, 138 comprises, as an example, a receiving bore 119, 139 which is provided for receiving a bolt or a pin 117, 137. The pin 117, 137 forms a ratchet-side rotational axis 115, 135 about which the first and the second pivot units 110, 130 are mounted in each case so as to be rotatable relative to the ratchet element 102.
[0057] The housing-side rotational axis 114 of the first pivot unit 110 extends parallel to the housing-side rotational axis 134 of the second pivot unit 130. The ratchet-side rotational axis 115 of the first pivot unit 110 extends parallel to the ratchet-side rotational axis 135 of the second pivot unit 130. In particular, the housing-side rotational axes 114, 134 of the first and of the second pivot units 110, 130 extend parallel to the ratchet-side rotational axes 115, 135 of the first and of the second pivot units 110, 130.
[0058] The first and the second pivot units 110, 130 comprise in each case another further bearing unit 120, 140 which is realized for the purpose of mounting a coupling unit 150 at least in part. The coupling unit 150 is realized, as an example, as a rod element 152. As shown in FIG. 4, the rod element 152 is bent in an L-shaped manner at its ends. The L-shaped bent ends of the rod element 152 are mounted in the further bearing unit 120 of the first pivot unit 110 and in the further bearing unit 140 of the second pivot unit 130. The coupling unit 150 is realized for coupling the first pivot unit 110 with the second pivot unit 130. In particular, a rotational movement of the first pivot unit 110 about the housing-side rotational axis 114 is transmitted by the coupling unit 150 to a rotational movement of the second pivot unit 130 about the housing-side rotational axis 134.
[0059] The housing-side bearing units 112, 132 of the first and of the second pivot units 110, 130 are connected in each case to the ratchet-side bearing units 118, 138 of the first and of the second pivot units 110, 130 by means of a first arm 122, 142. The pivot units 110, 130 are formed, as an example, from a hard elastic plastics material. A second arm 124, 144 connects the housing-side bearing units 112, 132 of the first and of the second pivot units 110, 130 in each case to the further bearing units 120, 140 of the first and of the second pivot units 110, 130. The first 122, 142 arm is connected, as an example, to the second arm 124, 144, in particular is realized integrally or rather as one component.
[0060] The first arm 122, 142 and the second arm 124, 144 are arranged advantageously within an angular range of between 65° and 115° with respect to one another, as an example at an angle of substantially 90°. To calculate the angle, in this case, a straight line is produced through the first arm 122, 142, which line extends perpendicular from the housing-side rotational axis 114, 134 to the ratchet-side rotational axis 115, 135, and a straight line is produced through the second arm, which line extends perpendicular from the housing-side rotational axis 114, 134 to the rotational axis of the further bearing unit 120, 140.
[0061] The first arm 122 of the first pivot unit 110 is realized advantageously parallel to the first arm 142 of the second pivot unit 130. In addition, the distance between the housing-side bearing unit 112 of the first pivot unit 110 and the ratchet-side bearing unit 118 of the first pivot unit is realized so as to be substantially identical to the distance between the housing-side bearing unit 132 of the second pivot unit 130 and the ratchet-side bearing unit 138 of the second pivot unit 130, as a result of which a parallelogram arrangement is realized.
[0062] FIG. 2 and FIG. 3 show longitudinal sections of the hand-held power tool 10 in the non-actuated and the actuated state. An actuated state according to FIG. 3 is to be understood, in this case, as a state of the hand-held power tool 10 where the switching element 104 is actuated, whilst in the non-actuated state according to FIG. 2 the switching element 104 is not actuated. To actuate the switching element 104, the hand-held power tool 10 comprises, as an example, on the second pivot unit 130 an additional arm 146 which is realized for the purpose of actuating a push button 106 of the switching element 104 in the actuated state. A force is exerted onto the control surface 103 of the ratchet element 102 by a user of the hand-held power tool 10 to actuate the switching unit 100. The ratchet-side bearing units 118, 138 of the first and of the second pivot units 110, 130 are moved along an imaginary circular path which extends at a radius R about the housing-side rotational axes 114, 134 of the first and of the second pivot units 110, 130. The radius R corresponds, in this case, to the distance between the housing-side rotational axes 114, 134 and the ratchet-side rotational axes 115, 135 of the first and second pivot units 110, 310. When the ratchet element 102 is actuated, the first arms 122, 142 of the first and the second pivot units 110, 310 are moved parallel to one another and relative to the housing 12, in particular to the motor housing 30, of the hand-held power tool 10. As a result of said relative movement, the additional arm 146 of the second pivot unit 130 acts upon the push button 106 of the switching element. The force exerted as a result onto the push button 106 of the switching element 104 moves the switching unit 100 and consequently the hand-held power tool 10 into an actuated state.
[0063] The force to be expended to actuate the switching unit 100 is able to be advantageously reduced as a result of lever transmission. The force to be expended is produced from the ratio between the distance between the housing-side rotational axis 134 of the second pivot unit 130 and the ratchet-side rotational axis 135 of the second pivot unit 130, on the one side, and the distance between the housing-side rotational axis 134 of the second pivot unit 130 and the contact surface of the further arm 146 of the second pivot unit 130 on the push button 106 of the switching element 104, on the other side. A smaller engagement force is possible as a result of said transmission ratio. The two arms 142, 146 comprise, in particular, a length ratio of 12.7 mm to 16.5 mm with respect to one another. The stroke of the push button 106 of the switching element 104 is, as an example, 5 mm Consequently, a stroke of 6.6 mm is produced, as an example, on the ratchet 102.
[0064] The first pivot unit 110 is spaced, in particular, in an axial manner, from the second pivot unit 130 by at least 35% of the axial extent of the ratchet element 102. In an advantageous manner, a substantially constant movement of the ratchet element 102 can be realized as a result of the mounting of the ratchet element 102 on the first and the second pivot units 110, 130. In particular, during actuation, the control surface 103 of the ratchet element 102 is moved toward the axial axis 1 in a manner substantially parallel to the axial axis 1 of the hand-held power tool 10. The axial axis 1 of the hand-held power tool extends through the drive shaft 38 of the motor 32.
[0065] FIG. 5 shows a perspective view of the ratchet element 102 and of the first and the second pivot units 110, 130, which units are connected together by means of the coupling unit 150. Additionally shown is a resetting unit 160 which is realized for the purpose of effecting a resetting force onto the ratchet element 102 in the actuated state. As a result of the resetting unit 160 and of the resetting force connected thereto, it can be ensured that the switching unit 100 is automatically displaced again into the non-actuated state without the user exerting any force on the switching element 102. Consequently, the resetting unit 160 provides a safety function in which operation of the hand-held power tool without active actuation of the ratchet element 102 is prevented. Active actuation is to be understood, in this case, as active actuation of the ratchet element 102 by an operator of the hand-held power tool 10. The resetting unit 160 is mounted advantageously so as to be movable in the second pivot unit 130. As an alternative to this, it is also conceivable for the resetting unit to be arranged in the push button 106 of the switching element 104 or between the ratchet element 102 and the motor housing 30. The resetting unit is realized, as an example, as a spring element, in particular, a leg spring 166. A perspective view of the leg spring 166 is shown in FIG. 6. The leg spring 166 is wound in a helical manner and comprises a linear end and an end which is bent in an L-shaped manner. For the bearing arrangement of the leg spring 166 in the second pivot unit 130, the helical winding of the leg spring 166 surrounds a hollow cylindrical structural element on the housing-side bearing unit 138 of the second pivot unit 130. In addition, the second pivot unit 130 comprises a stop element 162 which is provided as a stop for the linear end of the leg spring. The L-shaped end of the leg spring 166 engages in an additional receiving means 164 in the second pivot unit 130.
[0066] FIG. 7 shows a schematic part view of a hand-held power tool 10 with a resetting unit 160 in the actuated state. The linear end of the leg spring 166 is detached from the stop element 162 of the second pivot unit 130 in the actuated state and acts upon a stop element 163 which is connected to the motor housing 30. The leg spring is tensioned in the actuated state as a result of the deformation of the leg spring 166 against the motor-housing-side stop element 163.
[0067] FIG. 8 shows an alternative embodiment of the coupling unit 250. The coupling unit 250 is realized, as an example, as a plastics material part 252. The plastics material part 252 is realized in a rectangular manner The plastics material part comprises at its ends receiving bores 254, 256 which are realized as regards their position and size in such a manner that they are connectable by means of a pin to the further bearing units 120, 140 of the first and of the second pivot units 110, 130.
[0068] FIG. 9 shows a schematic part view of a hand-held power tool 10 with an alternative embodiment of the coupling unit 350. The coupling unit 350 is realized, as an example, as a toothed wheel gear unit. The ratchet element 102 is connected to the housing 12 of the hand-held power tool 10 by means of a first pivot unit 310 and a second pivot unit 330. The first and second pivot units 310, 330 are rotatably connected, in an analogous manner to the embodiment from FIG. 2, to the housing 12 of the hand-held power tool 10 by means of a housing-side bearing unit 312, 332 and are rotatably connected to the ratchet element 102 of the switching unit 100 by means of a ratchet-side bearing unit 318, 338. In an analogous manner to the embodiment from FIG. 2, the first and second pivot units 310, 330 comprise a first arm 322, 342 which connects the housing-side bearing unit 312, 332 and the ratchet-side bearing unit 318, 338 together. A free end of the first arm 322, 342 of the first and of the second pivot units 310, 330 comprises in each case a toothed wheel element 351, 353. The toothed wheel elements 351, 353 are arranged, as an example, on the housing-side bearing units 312, 332 of the first and of the second pivot units 310, 330. In particular, the toothed wheel elements 351, 353 are arranged so as to be rotatable about the housing-side rotational axes 314, 334 of the first and of the second pivot units 310, 330. The toothed wheel elements 351, 353 are non-rotatably connected to the first arm 322, 342 of the first and of the second pivot units 310, 330. As an example, the toothed wheel elements 351, 353 are realized integrally with the first arm 322, 342. As an alternative to this, it is also conceivable for the toothed wheel elements 351, 353 to be arranged on the ratchet-side bearing units 318, 338 of the first and of the second pivot units 310, 330.
[0069] The coupling unit 350 comprises a coupling element 352 in the form of a toothed wheel which is arranged along the axial axis 1 of the hand-held power tool 10 between the first and the second pivot units 310, 330. In addition, the coupling unit 350 includes the toothed wheel elements 351, 353 of the first and of the second pivot units 310, 330. The coupling element 352 is rotatably connected, as an example, to the housing 12 of the hand-held power tool 10. The coupling element 352 is rotatably mounted, as an example, by means of a bolt 355 of the housing 12 of the hand-held power tool 10. The coupling element 352 is arranged in such a manner that the teeth of the coupling element 352 engage between the teeth of the toothed wheel elements 351, 353 of the first and second pivot units 310, 330. As an alternative to this, it is also conceivable for the coupling element 352 to be rotatably connected to the ratchet 102.
[0070] As an alternative to this, it is also conceivable for the coupling element 352 to be realized in the form of a toothed wheel which is formed in a flattened manner and comprises a toothing only in part along the circumference. This results in an advantageous manner in installation space being able to be saved.
[0071] As a result of actuating the ratchet element 102 of the switching unit 100, in a manner analogous to the embodiment according to FIG. 2, a movement of the ratchet element 102 is effected relative to the housing 12 of the hand-held power tool 10. As the distance between the ratchet element 102 and the housing 12 of the hand-held power tool 10 becomes smaller, a rotational movement of the toothed wheel element 351 of the first pivot unit 310 and/or of the toothed wheel element 353 of the second pivot unit 330 is effected in an anticlockwise manner (see FIGS. 9 and 10). As a result of the interlocking of the toothed wheel elements 351, 353 with the coupling element 352, a rotational movement of one of the toothed wheel elements 351, 353 is transmitted to the other toothed wheel element 351, 353 by means of the coupling element 352 which rotates in the opposite direction. The coupling element 352 couples the first and the second pivot units 310, 330 in such a manner that the first arm 322 of the first pivot unit 310 always rotates parallel to the first arm 342 of the second pivot unit 330. In particular, during actuation of the ratchet element 102, the axial distance between the housing-side bearing units 312, 332 always corresponds to the axial distance between the ratchet-side bearing units 318, 338.
[0072] FIG. 10 shows the coupling unit 350 from FIG. 9 in the actuated state. In the actuated state, a further arm 346 of the second pivot unit 330 acts upon the push button 106 of the switching element 104. In the actuated state, the outside contour of the housing 12 of the hand-held power tool 10 merges advantageously without a step into the outside contour of the control surface 103 of the ratchet element 102.
[0073] FIG. 11 shows a schematic view of a hand-held power tool with a further alternative embodiment of the coupling unit 450 in the non-actuated state and FIG. 12 shows the actuated state. The second pivot unit 430 is realized in a manner analogous to the embodiment according to FIG. 8. The first pivot unit 410 comprises a housing-side bearing unit 412, on which is arranged, analogously to FIG. 9, a toothed wheel element 451. The teeth of the toothed wheel element 451 of the first pivot unit 410 are arranged in such a manner that they engage in the spaces between the teeth of the toothed wheel element 453 of the second pivot unit 430. In contrast to the previous embodiment, the arms 422, 442 of the first and of the second pivot units 410, 430 are not arranged parallel to one another. In particular, the axial distance between the housing-side bearing units 412, 432 is smaller than the axial distance between the ratchet-side bearing units 418, 438. When the ratchet element 102 is actuated, the first arm 422 of the first pivot unit 410 carries out a rotational movement in the opposite direction to the first arm 442 of the second pivot unit 430. The coupling unit 450 includes the toothed wheel element 451 of the first pivot unit 410 and the toothed wheel element 453 of the second pivot unit 430. The coupling unit 450 is realized for the purpose of coupling the pivot units 410, 430 in such a manner that a rotational movement of the first or second pivot unit 410, 430 brings about a rotational movement of the other pivot unit 410, 430 in the opposite direction. As the arms 422, 442 of the first and of the second pivot units 410, 430 rotate in opposite directions to one another when the ratchet element 102 is actuated, the distance between the ratchet-side bearing units 418, 438 of the first and of the second pivot units 410, 430 is modified during actuation. The ratchet-side bearing unit 418 of the first pivot unit 410 comprises a linear guide 456 which is realized for the purpose of providing the ratchet-side bearing unit 418 of the first pivot unit 410 with a further degree of freedom, in particular along the axial axis 1. The linear guide 456 is realized, as an example, as an axial groove or rather an elongated hole, by means of which a bolt 411 is mounted so as to be axially movable. In the case of an embodiment of the hand-held power tool 10 with a linear guide, it is conceivable to arrange the resetting element in the linear guide, as a result of which, once again, it is advantageously possible to save space.
[0074] FIG. 13 shows a schematic view of a hand-held power tool with a fourth alternative embodiment of the coupling unit 550 in the non-actuated state and FIG. 14 shows the actuated state. The coupling unit 550 is realized, as an example, as a scissors lifting unit. The ratchet element 102 is connected to the housing 12 of the hand-held power tool 10 by means of a first pivot unit 510 and a second pivot unit 530. The housing-side bearing unit 512 of the first pivot unit 510 and the housing-side bearing unit 532 of the second pivot unit 530 are advantageously arranged substantially along a parallel line to the axial axis 1 of the hand-held power tool 10. The ratchet-side bearing unit 518 of the first pivot unit 510 and the housing-side bearing unit 532 of the second pivot unit 530 are advantageously arranged substantially along a parallel line to the radial axis 2 of the hand-held power tool 10. The first arm 522 of the first pivot unit 510 is mounted so as to be movable relative to the first arm 542 of the second pivot unit 510, 530 by means of a coupling element 552. The coupling element 552 is realized, as an example, as a bolt. The coupling element 552 is fastened, as an example, on the hand-held power tool 10. The coupling element 552, in particular the bolt, extends substantially perpendicular to the axial axis 1 and perpendicular to the radial axis 2 of the hand-held power tool 10. The housing-side bearing unit 532 of the second pivot unit 530 comprises a first linear guide 556. The ratchet-side bearing unit 518 of the first pivot unit 510 comprises a second linear guide 556.
[0075] When the ratchet element 102 is actuated, a rotational movement of the first and of the second pivot units 510, 530 is effected about the coupling element 552. In this case, the distance, in particular the distance along a parallel line to the radial axis 2 of the hand-held power tool, between the housing-side bearing unit 532 of the second pivot unit 530 and the ratchet-side bearing unit 518 of the first pivot unit 510 is continuously reduced. In the actuated state, the two bearing units can overlap in a radial manner.
[0076] When the ratchet element 102 is actuated, the angle c between the first arm of the first pivot unit 510 and the first arm of the second pivot unit 530 decreases, as an example, from a value of 50° in the non-actuated state (see FIG. 13) to a value of 0° in the actuated state (see FIG. 14). In particular, the first arms 522, 542 of the first and second pivot units 510, 530 are arranged side by side in the actuated state. In the embodiment shown of the coupling unit 550 as a scissors lifting unit, at least one housing-side bearing unit 532 is mounted so as to be linearly movable relative to the housing 12 of the hand-held power tool 10. In addition, at least one ratchet-side bearing unit 518 is also mounted so as to be linearly movable relative to the ratchet 102. As an example, the ratchet element 102 has associated therewith a resetting element 566. In actuated state, the resetting element 560 acts upon the push button 106 of the switching element 104. The resetting element 560 is realized, as an example, from an elastic material in the form of a protruding lug.
[0077] FIG. 15 shows a top view of a bottom surface of a hand-held power tool 10 with a ratchet element 102. The ratchet element 102 comprises a substantially rectangular control surface 103. The control surface 103 has a length of approximately 45% of the axial length 3 of the hand-held power tool 10. The width of the control surface 103 is, as an example, 55% of the width of the hand-held power tool 10. Ratchet elements 102 of this size can be advantageously mounted by means of the coupling unit according to the disclosure so as to be rotatable or pivotable in such a manner that a substantially constant movement of the ratchet element is realized. As a result, the ratchet element 102 is operable equally in each grip position. In particular, there is no difference to the operator in the operation irrespective of whether he/she encompasses and operates the housing 12 of the hand-held power tool 10 on the rear end or in the front region. As a result, there is advantageously a gain in safety and comfort. The ratchet element 102 can advantageously comprise a length of at least 140 mm and at most 180 mm and a width of at least 32 mm and at most 55 mm.
