Quick clamping device

Abstract

A quick clamping device for positioning an accessory device on a hand-held power tool such as an angle grinder. The quick clamping device includes a drive output unit for moving the accessory device about a drive output axis of the drive output unit. The quick clamping device further includes a retaining unit for retaining the accessory device on the hand-held power tool. The retaining unit has a retaining element. The retaining unit has a retaining parameter which changes in a retaining state, in particular in the event of a transition from a retaining state to a clamping state.

Claims

1. A quick clamping device for arranging an accessory device on a hand-held power tool, comprising: an output unit configured to move the accessory device about an output axis of the output unit, and a retaining unit having a retaining element configured to retain the accessory device on the hand-held power tool, wherein the quick clamping device has a retaining state, in which the retaining unit is configured to retain the accessory device on the output unit and the retaining element is rotationally movable relative to the output shaft, and a clamping state, in which the retaining unit is configured to fix the accessory device to the output unit and the retaining unit is translationally movable relative to the output shaft, wherein, (i) in the retaining state, the retaining element is configured to exhibit a rotational movement relative to the output shaft about the output axis that is greater than the rotational movement of the retaining element relative to the output shaft about the output axis in the clamping state, and (ii) in the clamping state, the retaining element is configured to exhibit a translational movement relative to the output shaft about the output axis that is greater than the translational movement of the retaining element relative to the output shaft about the output axis in the retaining state.

2. The quick clamping device as claimed in claim 1, wherein, in the retaining state, the retaining element is disabled from movement relative to the output unit along the output axis.

3. The quick clamping device as claimed in claim 1, wherein, in the clamping state, the retaining element is disabled from movement relative to the output unit about the output axis.

4. The quick clamping device as claimed in claim 1, wherein the retaining element is configured to engage through the accessory device and to clamp the accessory device.

5. A hand-held power tool comprising: the quick clamping device as claimed in claim 1.

6. The quick clamping device as claimed in claim 1, wherein the hand-held power tool is an angle grinder.

7. The quick clamping device as claimed in claim 1, wherein; the retaining element has a releasing state in which the accessory device is released and removable from the retaining element, the retaining element has a transition point at which the retaining element transitions between the retaining state and the clamping state, the retaining element has a clamped-in-place position at which the accessory device is clamped in place by the retaining element, and the retaining element is configured such that the translational movement of the retaining element with respect to the output unit along the output axis from the transition point to the clamped-in-place state is greater than the translational movement of the retaining element from the releasing state to the transition point.

8. The quick clamping device as claimed in claim 1, wherein; the retaining element has a releasing state in which the accessory device is released and removable from the retaining element, the retaining element has a transition point at which the retaining element transitions between the retaining state and the clamping state, the retaining element has a clamped-in-place position at which the accessory device is clamped in place by the retaining element, and the retaining element is configured such that the rotational movement of the retaining element with respect to the output unit about the output axis from the releasing state to the transition point is greater than the rotational movement of the retaining element from the transition point to the clamped-in-place state.

9. The quick clamping device as claimed in claim 1, further comprising a preloading element configured to control the retaining parameter of the retaining unit.

10. The quick clamping device as claimed in claim 9, further comprising a spring element configured to preload the retaining element with respect to the preloading element.

11. The quick clamping device as claimed in claim 1, further comprising a cam mechanism configured to move the retaining element relative to the output unit in a direction of rotation about the output axis.

12. The quick clamping device as claimed in claim 11, wherein the cam mechanism has a guide unit configured to control rotary movement of the retaining element with respect to a spindle element.

13. The quick clamping device as claimed in claim 12, further comprising a spring element configured to preload the retaining element with respect to the spindle element.

14. The quick clamping device as claimed in claim 1, further comprising a clamping unit configured to move the retaining element along the output axis.

15. The quick clamping device as claimed in claim 14, wherein: the clamping unit includes a clamping element, and the clamping element is formed in one piece with the retaining element or the clamping element is in the form of a separate clamping ring coupled to the retaining element.

16. The quick clamping device as claimed in claim 14, wherein the clamping unit has a first sloping element.

17. The quick clamping device as claimed in claim 16, wherein the first sloping element has a first sloping portion and a second sloping portion, the second sloping portion being angled with respect to the first sloping portion.

18. The quick clamping device as claimed in claim 16, wherein the clamping unit has a second sloping element configured to cooperate indirectly or directly with the first sloping element.

19. The quick clamping device as claimed in claim 18, wherein the first sloping element includes a first thread or ramp element, the second sloping element includes a second thread or ramp element, and the first thread or ramp element is configured to cooperate indirectly or directly with the second thread or ramp element.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Further advantages will become apparent from the following description of the drawing. In the drawing, exemplary embodiments of the disclosure are illustrated. The drawings, the description and the claims contain numerous features in combination. A person skilled in the art will expediently also consider the features individually and combine them to form useful further combinations. In the drawing:

(2) FIG. 1 shows a perspective view of a hand-held power tool with a quick clamping device according to the disclosure,

(3) FIGS. 2 and 3 each show a section through the hand-held power tool,

(4) FIG. 4 shows two states of the quick clamping device,

(5) FIG. 5 shows a section through the quick clamping device,

(6) FIG. 6 shows an exploded view of the quick clamping device from FIG. 5,

(7) FIGS. 7 to 9 show a plurality of states of the quick clamping device,

(8) FIG. 10 shows a development of the quick clamping device,

(9) FIGS. 11 to 14 show a development of the quick clamping device.

DETAILED DESCRIPTION

(10) In the following figures, identical components are provided with the same reference signs.

(11) FIG. 1 shows a power tool system having a hand-held power tool 13 with a housing 15 and an accessory device 17. The hand-held power tool 13 is in the form of an angle grinder. The accessory device 17 is in the form of a grinding wheel and/or of a cut-off wheel. The accessory device 17 has a connection device 19 (cf. FIG. 4). The connection device 19 is in the form of a continuous receiving cutout 21.

(12) The hand-held power tool 13 has a quick clamping device 23, which is intended to arranged the accessory device 17 on the hand-held power tool 13. The hand-held power tool 13 has an actuation means 25 for opening and closing the quick clamping device 23. The actuation means 25 is in the form of a pull lever 54. The pull lever 54 has an eccentric 27. The actuation means 25 is intended, in particular by means of the eccentric 27, to move an unlocking bolt 29 (cf. FIGS. 2 and 3) of the quick clamping device 23 in an axial direction. The unlocking bolt 29 is intended to unlock the quick clamping device 23 when the unlocking bolt 29 moves into the housing 15 of the power tool 12. When the quick clamping device 23 is locked, the unlocking bolt 29 moves out of the housing 15 of the power tool 12. The actuation means 25 shown in FIG. 1 is in a closed state. The power tool 12 has a drive unit 31, which is intended to provide kinetic energy in order to move, in particular to rotate, the accessory device 17. The drive unit 31 is arranged in the housing 15. The drive unit 31 is in the form of an electric motor and embodied in particular as an EC motor.

(13) The quick clamping device 23 has an output unit 33 for moving the accessory device 17 about an output axis A of the output unit 33. The drive unit 31 drives the output unit 33 in order to move the accessory device 17 about an output axis A. The output unit 33 is intended to transmit a rotational and/or oscillatory movement about the output axis A to an accessory device 17 retained on the output unit 33 by means of the retaining unit 37. The output unit 33 is operatively connected via a drive pinion of the drive unit 31. The output unit 33 comprises a spindle element 47 in the form of a hollow shaft, in particular of a hollow spindle.

(14) The quick clamping device 23 also has a retaining unit 37, having a retaining element 39, for retaining the accessory device 17 on the hand-held power tool 13. The retaining unit 37 is settable such that a retaining parameter is changed in a retaining state, in particular during a transition from a retaining state into a clamping state, of the retaining unit 37.

(15) As a result of a change to the retaining parameter, the accessory device 17 can be transferred particularly easily from a retaining state into a clamping state. The retaining parameter of the retaining unit 37 is set such that the retaining unit 37 is transferred from a releasing state into a retaining state by means of a rotational movement (FIG. 10; FIG. 11 et seq.) or by means of a rotational movement and movement in translation (FIGS. 2 to 9), in order to retain the accessory device 17 on the quick clamping device 23. The retaining unit 37, or the retaining element 39, is in this case mounted, or forcibly actuated, so as to be movable in rotation (FIG. 10; FIG. 11 et seq.) or in rotation and translation (FIGS. 2 to 9) in a retaining state.

(16) Furthermore, the retaining parameter of the retaining unit 37 is settable or variable such that the retaining unit 37 is transferred from a retaining state into a clamping state by means of a movement in translation, in order to clamp the accessory device 17 to the quick clamping device 23. The retaining unit 37, or the retaining element 39, is in this case mounted, or forcibly actuated, so as to be movable in translation (FIGS. 2 to 9; FIG. 10) or in rotation and translation (FIG. 11 et seq.) in a clamping state. Particularly advantageously, a separation of functions can be achieved as a result in that a retaining parameter of the retaining unit 37 is changed in a retaining state and so a direction of movement of the retaining element 39 of the retaining unit 37 can be changed, in particular prevented or enabled. For example, during a transition from a retaining state into a clamping state, a rotational relative movement about the output axis A and a relative movement in translation along the output axis A of the retaining element can be changed into a relative movement in translation along the output axis A (FIGS. 2 to 9). For example, during a transition from a retaining state into a clamping state, a rotational relative movement about the output axis A of the retaining element 39 can be changed into a relative movement in translation along the output axis A (FIG. 10). For example, during a transition from a retaining state into a clamping state, a rotational relative movement about the output axis A of the retaining element 39 can be changed into a rotational relative movement about the output axis A and a relative movement in translation along the output axis A (FIG. 11 et seq.).

(17) A retaining parameter should be understood as meaning a degree of freedom of movement of the retaining element 39.

(18) The retaining element 39 is intended to retain the accessory device 17 on the quick clamping device 23 by way of a form fit.

(19) In addition to the retaining element 39, the retaining unit 37 has a spindle element 47. The retaining element 39 is mounted so as to be movable with respect to the spindle element 47 in one state. The retaining element 39 and the spindle element 47 are arranged with respect to one another such that the accessory device 17 is retained on the quick clamping device 23 in an axial direction along the output axis A. The retaining element 39 and the spindle element 47 are intended to transmit a clamping force to the accessory device 17 by means of a clamping unit 51. The clamping force corresponds preferably at least to a retaining force which is intended to retain the accessory device 17 on the quick clamping device 23 in an operating state of the quick clamping state 23 or of the hand-held power tool 13. The retaining element 39 and the spindle element 47 are mounted so as to be movable with respect to one another in an axial direction along the output axis A, in order to clamp the accessory device 17 in an axial direction.

(20) The spindle element 47 engages around the retaining element 39 along a circumferential direction which lies in a plane, the surface normal of which extends at least substantially parallel to the output axis A. The spindle element 47 is in the form of a hollow shaft, in order to at least partially receive the retaining element 39.

(21) The retaining element 39 is intended to engage through a receiving cutout 21 of the accessory device 17 and to retain the accessory device 17 on the quick clamping device 23 by way of a form fit. The retaining element 39 has a plurality of, in particular four, retaining wings 53, which extend outwardly in a radial direction with respect to the output axis A. The retaining element 39 has a retaining contour 55, which corresponds approximately to a receiving contour 57 of a receiving cutout 21 of the accessory device 17. The retaining contour 55 is outlined by contours of the retaining wings 53. The retaining contour 55 is formed approximately so as to correspond to the receiving contour and so as to be smaller than the receiving contour 57, in order to allow the retaining wings 53 to engage through the receiving cutout 21. The retaining element 39 is configured such that the retaining contour 55 fits through the receiving contour 57 in order for it to be possible to plug the retaining element 39 through the receiving cutout 21 of the accessory device 17. To this end, the retaining element 39 is intended to engage through the receiving cutout 21 of the accessory device 17 by means of the retaining wings 53 and to retain the accessory device 17. The retaining element 39 is rotatable with respect to the receiving cutout 21 such that the retaining wings 53 form a form fit with the accessory device 17. The retaining contour 55 is able to oriented with respect to the receiving contour 57 such that, in a first rotary position (FIG. 13), the retaining contour 55 covers the receiving contour 57 such that the retaining element 39 is able to be plugged through the receiving cutout 21, and upon rotation about the output axis A into a second rotary position (FIG. 14), the retaining contour 55 overlaps the receiving contour 57 of the receiving cutout 21. The retaining element 39 is able to be plugged through the accessory tool depending on a rotary position of the retaining element 39 and, in the event of a change in the rotary position, forms a form fit, in particular in an axial direction along the output axis A, with the accessory device 17.

(22) The retaining element 39 is connected to the quick clamping device 23, in particular so as to be unable to be removed, in a releasing state (FIG. 9), a retaining state (FIG. 8) and a clamping state, in particular a clamped-in-place state, (FIG. 7). The retaining element 39 is mounted so as to be movable in translation in an axial direction along the output axis A and/or in rotation about the output axis A in relation to the spindle element 47, wherein an axis of movement, in particular an axis of rotation, of the retaining element 39 coincides at least substantially with the output axis A. In FIG. 9, the quick clamping device is in a releasing state and passes into a retaining state upon movement of the retaining element 39. The releasing state in FIG. 9 forms a bottom dead center of the retaining element. When the quick clamping device moves from a position in FIG. 9 to a position in FIG. 8, the quick clamping device is in a retaining state. In FIG. 8, the quick clamping device is transitioning from a retaining state into a clamping state. When the quick clamping device moves from a position in FIG. 8 to a position in FIG. 7, the quick clamping device is in a clamping state and, in FIG. 7, reaches a clamped-in-place state, in which the retaining element reaches a top dead center.

(23) The retaining element 39 is mounted so as to be rotatable substantially about the output axis A in the retaining state and/or mounted so as to be movable substantially along the output axis A in a/the clamping state. In the retaining state, the retaining element 39 is mounted so as to be rotatable about the output axis A and/or to be movable along the output axis A. In the clamping state, the retaining element 39 is mounted so as to be rotatable about the output axis A and/or to be movable along the output axis A. The retaining element 39 may be mounted so as not to be movable along the output axis A in the retaining state (FIG. 10; FIG. 11 et seq.). The retaining element 39 may be mounted so as not to be rotatable about the output axis A in the clamping state (FIGS. 2 to 9; FIG. 10). Separation of the functions can be achieved in that the retaining element 39, during a transition from the retaining state into the clamping state, is switched from being mounted so as to be rotatable about the output axis A to being mounted so as to be movable along the output axis A. Separation of the functions can also be achieved in that the retaining unit 37 is mounted, for example in a clamping state, so as to be movable in translation along the output axis A or mounted so as to be movable in translation along the output axis A and to be rotatable about the output axis A.

(24) In FIG. 10 and FIG. 11 et seq., a movement of the retaining element with respect to the spindle element along the output axis from the releasing state as far as a transition from the retaining state into the clamping state of the retaining unit is prevented. In FIGS. 2 to 9, a movement of the retaining element with respect to the spindle element about the output axis from a transition from the retaining state into the clamping state as far as a clamped-in-place state of the retaining unit is prevented.

(25) To fix the accessory device, the retaining element is rotatable through an angle about the output axis with respect to the spindle element from a releasing state (bottom dead center) as far as a clamped-in-place state (top dead center). The angle may comprise a range from 0 to 40 with a tolerance of +20 to 10 (FIGS. 2 to 9; FIG. 10). The angle may comprise a range from 0 to 48 with a tolerance of +/16 (FIG. 11 et seq.).

(26) A change in the retaining parameter can take place by changing a degree of freedom of the retaining unit 37, in particular of the retaining element 39, in that, for example, a rotational movement is prevented and a movement in translation is enabled.

(27) The retaining element 39 is intended to engage through the accessory device 17 and to clamp the accessory device 17. The retaining element 39 is intended to extend through the accessory device 17 in a releasing state and to rotate about the output axis A with respect to the accessory device 17 by means of a rotary movement in a retaining state, in order to hold the accessory device 17 by way of a form fit. Depending on a rotary position of the retaining element 39, the retaining element 39 is able to be plugged through the accessory tool (FIG. 13) and, in the event of a change in the rotary position, forms a form fit in an axial direction along the output axis A with the accessory device 17 (FIG. 14). The retaining element 39 has a retaining wing 53 which extends in a radial direction with respect to an output axis A and is intended to engage at least partially around the accessory device 17. The retaining wing 53 is intended to exert a clamping force on the accessory device 17. The retaining wing 53 has a retaining face 54 which extends in a radial direction with respect to the output axis A in a radial plane of the output axis A.

(28) The retaining element 39 is intended to transfer the accessory device 17 from a releasing state into a retaining state (FIGS. 2 to 9; FIG. 10) and/or a clamping state (FIG. 11 et seq.) by means of a rotary movement of the retaining element 39 about the output axis A with respect to the spindle element 47.

(29) The quick clamping device 23 has a clamping unit 51, having a clamping element 61, which is intended to move the retaining element 39 axially along the output axis A. The clamping unit 51 is coupled to the retaining unit 37. The clamping element 61 is intended to transfer the accessory device 17 from a retaining state into a clamping state in an axial direction by means of the retaining unit 37. The clamping element 61 is intended to transmit a clamping force axially along the output axis A to the accessory device 17 in order to brace the accessory device 17. The clamping element 61 is intended to control an axial movement of the retaining element 39. The clamping element 61 is intended to brace the accessory device 17 in an axial direction along the output axis A by means of a relative movement or a rotary movement of the clamping element 61 about the output axis A with respect to the spindle element 47.

(30) The clamping element 61 has a sloping element 65 in the form of a thread element (FIGS. 2 to 9) or of a ramp element (FIG. 10; FIG. 11 et seq.). The sloping element 65 is configured in the manner of a wedge element which is intended to convert a movement of the retaining element 39 in the circumferential direction about the output axis A into a movement of the retaining element 39 in an axial direction along the output axis A. The sloping element 65 may have a varying or constant slope. The sloping element may be configured with a monotonic, in particular strictly monotonic slope. The sloping element 65 may form a threaded portion.

(31) The clamping unit 51 has a plurality of sloping elements 65, which follow one another in a circumferential direction. The sloping elements 65 may be arranged in series with one another in a circumferential direction (FIG. 10). The sloping elements 65 may be spaced apart from one another in a circumferential direction (FIG. 11 et seq.). The sloping elements 65 are delimited by two radial planes, which extend radially with respect to the output axis A and/or are arranged parallel to one another. The two radial planes delimit each first sloping element 65. A spacing of the two radial planes is delimited by a maximum axial extent of the sloping elements 65. The two radial planes may be at a spacing from one another, which corresponds substantially to a maximum axial movement of the retaining element 39 along the output axis A from a releasing state into a clamping state.

(32) The sloping element 65 has a first sloping portion 71 and a second sloping portion 73 that is angled with respect to the first sloping portion 71. The first sloping portion 71 extends in a radial plane of the output axis A. The first sloping portion 71 is formed in a planar manner. The first sloping portion 71 is embodied so as to be flat in a circumferential direction about the output axis A and does not have a slope. It is conceivable for the first sloping portion 71 to be angled with respect to a radial plane of the output axis A. The second sloping portion 73 is angled with respect to a radial plane of the output axis A. By means of the first sloping portion 71 and the second sloping portion 73 of the sloping element 65, the retaining parameter of the retaining unit 37 can be changed.

(33) The further sloping element 67 may be configured analogously to the sloping element 65.

(34) The clamping unit 51 has a further sloping element 67 which is assigned to the sloping element 65 and is intended to cooperate indirectly or directly with the sloping element 65. The further sloping element 67 comes into contact with the sloping element 65. The further sloping element 67 is mounted so as to be movable in a circumferential direction about the output axis A and/or in an axial direction along the output axis A relative to the sloping element 65. The further sloping element 67 is mounted so as to slide with respect to the sloping element 65. The sloping element 65 and the further sloping element 67 may each form a thread element (FIGS. 2 to 9) or a ramp element (FIG. 10; FIG. 11 et seq.) which cooperate with one another. The further sloping element 67 is arranged on a further clamping element 63.

(35) The clamping element 61 may be formed in one piece with the retaining element 39 (FIGS. 2 to 9). The clamping element 61 may be configured as a separate clamping ring coupled to the retaining element 39 (FIG. 10; FIG. 11 et seq.).

(36) The clamping element 61 delimits the retaining element 39 in a radial direction with respect to the output axis A. The clamping element 61 is integrated with the retaining element 39. The clamping element 61 surrounds the retaining element 39 in at least one plane through 360 and is arranged concentrically with the retaining element 39. The clamping element 61 is in the form of a separate component which is able to be connected to the retaining element 39 for conjoint rotation (FIG. 10; FIG. 11 et seq.). The clamping element 61 is in the form of a separate component which is connected to the retaining element 39 by a fastening means 75 in the form of a fastening screw. The clamping element 61 is substantially in the form of a disk. The clamping element 61 is substantially annular. The clamping element 61 is connected fixedly to the retaining element 39 such that a relative movement (rotary movement, movement in translation) of the two elements is prevented. The clamping element 61 is connected to the retaining element 39 for conjoint rotation. The clamping element 61 is intended to clamp the retaining unit 37 by means of a rotary movement of the clamping element 61 with respect to a further clamping element 61, 63 of the clamping unit 51. The clamping element 61 is arranged on a side of the retaining element 39 that faces away from the accessory device 17. The clamping element 61 is placed on the retaining element 39.

(37) The clamping unit 51 has a further clamping element 63, which is intended to cooperate indirectly or directly with the clamping element 61. The further clamping element 63 may be formed on the spindle element 47 or on a preloading element 77.

(38) In FIGS. 2 to 9, the further clamping element 63 is arranged on the spindle element 47 and intended to cooperate with the clamping element 61, formed in one piece with the retaining element 39, indirectly or by means of a preloading element 77 in the form of a preloading sleeve. The clamping element 61 is formed integrally with the retaining element 39. The further clamping element 63 delimits a radial extent of the spindle element 47. The further clamping element 63 is formed in one piece or integrally with the retaining element 39. In this case, the preloading element 77 has two intermediate clamping elements 81, 83 that correspond to the clamping element 61 and the further clamping element 63. The intermediate clamping elements 81, 83 are arranged on the preloading element 77 and formed in one piece therewith. A first intermediate clamping element 81 is arranged on an inner side of the preloading element 77 and is in the form of an internal thread. A second intermediate clamping element 83 is arranged on an outer side of the preloading element 77 and is in the form of an external thread. The first intermediate clamping element 81 is intended to cooperate with the clamping element 61 in the form of an external thread. The second intermediate clamping element 83 is intended to cooperate with the further clamping element 63, in the form of an internal thread, of the spindle element 47. The intermediate clamping elements 81, 83 delimit the preloading element 77 in a radial direction with respect to the output axis A. The further clamping element 63 is formed in one piece with the preloading element 77.

(39) In FIG. 10, the further clamping element 63 is arranged on a preloading element 77 in the form of a preloading sleeve, and is intended to cooperate directly with the clamping element 61 in the form of a clamping ring. The clamping element 61 is in the form of a separate component. The clamping element 61 is in the form of a separate clamping ring coupled to the retaining element 39. The clamping element 61 and the further clamping element 63 are in the form of ramp elements (FIG. 10; FIG. 11 et seq.). The further clamping element 63 delimits the preloading element 77 in an axial direction along the output axis A. The further clamping element 63 is formed in one piece with the preloading element 77. Depicted at the bottom left in FIG. 10 is a development of the preloading element 77, which has a further clamping element 63 which delimits an axial extent of the preloading element 77. The further clamping element 63 extends in this case annularly on an end face of the preloading element 77 and/or protrudes radially with respect to the output axis A. At the bottom left in FIG. 10, the further clamping element 63 is arranged in an inner region of the preloading element 77. The further clamping element 63 is delimited in a radial direction by a hollow-cylindrical wall extending in an axial direction along the output axis A.

(40) In FIG. 11 et seq., the further clamping element 63 is arranged on the spindle element 47 in the form of a spindle sleeve and is intended to cooperate directly with the clamping element 61 in the form of a clamping ring. The further clamping element 63 delimits the spindle element 47 in an axial direction along the output axis A. The further clamping element 63 is formed in one piece with the spindle element 47. The further clamping element 63 is coupled to the clamping element 61 and comes into direct contact therewith.

(41) The clamping element 61 and the further clamping element 63 each have at least one sloping element 65, 67, which forms the thread element or the ramp element. It goes without saying that it is also possible for only the clamping element 61 or the further clamping element 63 to have a sloping element 65, 67. For example, it is possible for one of the clamping elements 61, 63 not to have a sloping element 65, 67 but to be formed for example as a kind of elevation which is intended to cooperate with sloping element 65, 67 corresponding to the elevation.

(42) The retaining element 39 has a spindle element 47, which is intended to cooperate with the retaining element 39 by means of the clamping unit 51 and to drive the accessory device 17 about the output axis A. The spindle element 47 comes into indirect contact with the accessory device 17 in that the spindle element 47 has a contact element 85 having a contact face 87, said contact element 85 serving as a support for the accessory device 17 in an axial direction along the output axis A. The spindle element 47 is in the form of a spindle sleeve and surrounds the retaining element in a plane through 360. The spindle element 47 is intended to mount the accessory device 17 for conjoint rotation in a circumferential direction about the output axis A, at least in a clamping state, and to drive it in an operating state. To this end, the spindle element 47 has a driving element 89 which is intended to set the accessory device 17 in rotation about the output axis A. The driving element 89 is in the form of a rotary driving element. The driving element 89 is intended to engage through the accessory device 17 and/or to form a form fit with the accessory device 17.

(43) The quick clamping device 23 has a preloading element 77, which is intended to control a/the retaining parameter of the retaining unit 37. The preloading element 77 is intended to cooperate with the retaining element 39 and the spindle element 47. The preloading element 77 has the further clamping element 61, 63 with a further sloping element 65, 67, which is in the form of a thread element or an external thread.

(44) In particular, a movement of the retaining element 39 in translation with respect to the spindle element along the output axis A from a transition from the retaining state into the clamping state as far as the clamped-in-place state (top dead center) is greater than from the releasing state as far as the transition from the retaining state into the clamping state of the retaining element 39. Preferably, a movement of the retaining element 39 in translation between the releasing state and the transition from the retaining state into the clamping state is prevented and from the transition from the retaining state into the clamping state or the clamped-in-place state is enabled. In order to move from a releasing state as far as the transition from the retaining state into the clamping state, the retaining element 39 may be movable only by means of a rotational movement such that the accessory device is retained on the hand-held power tool 13.

(45) In particular, a rotational movement of the retaining element 39 with respect to the spindle element about the output axis A from the releasing state as far as a transition from the retaining state into the clamping state is greater than a rotational movement from the transition from the retaining state into the clamping state as far as a clamped-in-place state of the retaining element 39. Preferably, a rotational movement of the retaining element 39 from the transition from the retaining state into the clamping state is prevented and from the releasing state as far as the transition from the retaining state into the clamping state is enabled.

(46) The preloading element 77 surrounds the retaining element 39 in a circumferential direction about the output axis A. The preloading element 77 is substantially hollow-cylindrical and forms a preloading sleeve. The preloading element 77 is mounted so as to be movable with respect to the retaining element 39 and/or the spindle element 47 in a retaining state and is preloaded in an axial direction with respect to the retaining element 39. The preloading element 77 is arranged on the retaining element 39 and coupled thereto. The preloading element 77 is formed so as to be rotationally fixed with respect to the retaining element 39 and is surrounded by the spindle element 47. The preloading element 77 is preloaded in a circumferential direction about the output axis A with respect to the spindle element 47 and has a main extent which extends along the output axis A. By means of the preloading element 77, separation of the functions can be achieved in that the preloading element 77 transfers the retaining element 39 by means of a rotary movement from a releasing state into a retaining state, for the one part, and by means of a movement in translation from a retaining state into a clamping state, for the other part.

(47) The retaining unit 37 has a spindle element 47 and a retaining element 39, wherein the preloading element 77 is arranged between the spindle element 47 and the retaining element 39. The preloading element 77 encases the retaining element 39 and is encased by the spindle element 47. The preloading element 77 is arranged concentrically with the spindle element 47 and the retaining element 39.

(48) The preloading element 77 is coupled to the retaining element 39 and to the spindle element 47 and is intended to cooperate with the spindle element 47 and the retaining element 39. To this end, the preloading element 77 is intended to brace the retaining element 37 in an axial direction along the output axis A with respect to the spindle unit in a clamping state.

(49) The quick clamping device 23 has a cam mechanism 91 which is intended to move the retaining element 39 in a direction of rotation about the output axis A. The cam mechanism 91 is intended to move the retaining element 39 back and forth between two end positions (FIGS. 7 to 9). The cam mechanism 91 is intended to convert a linear movement of the unlocking bolt 29 of the quick clamping device 23 at least partially into a rotational movement, in particular of the retaining element 39. To this end, the cam mechanism 91 has a guide unit 95, which is intended to control a rotary movement of the retaining element 39 with respect to the spindle element 47. The guide unit 95 is intended to transfer the retaining element 39 from a releasing state into a clamping state and vice versa. The guide unit 95 has a plurality of guide cutouts 99, which are intended to guide a clamping pin 97 connected transversely to the unlocking bolt 29 axially along the output axis A. The unlocking bolt 29 is connected to the clamping pin 97 by way of a form fit. The unlocking bolt 29 is arranged coaxially with the output axis A. The clamping pin 97 is in the form of a clamping bolt and intended to delimit a movement of the retaining element 39 in an axial direction along the output axis A and/or in a circumferential direction about the output axis A with respect to the spindle element 47. The guide cutouts 99 partially have a path curve having a course that is angled with respect to the output axis A. The clamping pin 97 is guided in the guide cutout 99 such that the clamping pin 97 controls the retaining element 39 with respect to the spindle element 47. A movement of the clamping pin 97 in an axial direction along the guide cutouts 99 results in a forced movement of the retaining element 39 with respect to the spindle element 47. The clamping pin 97 is intended to slide in an axial direction along the output axis A, in particular along the guide cutout(s) 99, with respect to the spindle element 47 and the retaining element 39. As a result, by means of the cam mechanism 91, the retaining element 39 can be forced to move relative to the spindle element 47. The guide unit 95 has a plurality of guide cutouts 99, which have in particular a straight course, a helical course or a course that is curved in some other way. A movement of the retaining element 39 with respect to the spindle element 47 can be controlled depending on the orientations of the guide cutouts 99.

(50) The cam mechanism 91 has a plurality of cam mechanism elements 93, which are formed by the retaining element 39, the preloading element 77 and/or the spindle element 47. The cam mechanism elements 93 each have a guide cutout 99. The guide cutouts 99 are intended to guide a clamping pin 97 and to control a rotary movement of the retaining unit 37 about the output axis A. By means of the guide cutouts 99, a movement of the cam mechanism element 93 can be coupled.

(51) Preferably, the preloading element 77 has a preloading guide element 101, in particular a preloading guide groove.

(52) Preferably, the spindle element 47 has a spindle guide element 102, in particular a spindle guide groove. Particularly preferably, the retaining element 39 has a retaining guide element 103, in particular a retaining guide groove. More preferably, the respective guide cutouts 99 are coupled to the clamping pin 97. In particular, the guide cutouts 99 are intended to control an axial movement of the retaining element and/or of the preloading element (FIG. 10) with respect to the spindle element 47 by means of the clamping pin 97 guided in or on the guide cutouts 99. In particular, the guide cutouts 99 are each in the form of slots. The slots can each be formed at least partially in a rectilinear and/or curved manner. At least one guide cutout 99 may have an extent along the output axis A which is intended to delimit an axial movement of the retaining element 39. In particular, the clamping pin 97 is intended to be guided along the guide cutouts 99 such that a movement of the retaining element 39 with respect to the preloading element 77 and the spindle element 47 is allowed, in order to move the quick clamping device 23 from a clamping state into a releasing state and vice versa.

(53) In particular, an interaction of the guide unit 95 and the clamping unit 51 has the effect that the retaining element 39 is controlled from a releasing state into a clamping state or from a releasing state into a retaining state or a clamping state and vice versa.

(54) In FIGS. 2 to 9, the clamping pin is intended to be plugged through the preloading guide element 101, the spindle guide element 102 and the retaining guide element 103 and to be guided in an axial direction along the guide element, in order to allow a forced movement of the retaining element with respect to the spindle element. In addition, an axial movement of the retaining element with respect to the spindle element is delimited by the clamping element 61 and the further clamping element 63. The two clamping elements 61, 63 form two threads with the two intermediate clamping elements 81, 83. The guide elements 99, 101, 102, 103 are formed in a curved manner, in particular at least partially rectilinear and/or curved manner, such that, during a transition from a releasing state into a retaining state, a thread is blocked and further thread is released, and during a transition from a retaining state into a clamping state, both threads are released.

(55) The quick clamping device 23 has a spring element 105 which is intended to preload the retaining element 39 in a releasing state with respect to the preloading element 77 and/or the spindle element 47. The spring element 105 is in the form of a tension/compression spring. The spring element 105 is mounted in a cavity of the retaining element 39. The spring element 105 is intended to preload the clamping pin 97 or the unlocking bolt 29. The spring element 105 is preloaded to a greater extent in a releasing state than in a clamping state.

(56) The quick clamping device 23 may have a further spring element 107 which is intended to preload the preloading element 77 in a circumferential direction about the output axis A with respect to the spindle element 47 (FIG. 10). The further spring element 107 is in the form of a torsion spring. The torsion spring surrounds the retaining element 39 in a plane through 360. The further spring element 107 may follow the preloading element 77 in an axial direction. The further spring element 107 is intended to preload the preloading element 77 in a clamping state with respect to the spindle element 47. The further spring element 107 is in this case tensioned to a greater extent in a clamping state than in a releasing state. The torsion spring is preloaded or relaxed with respect to the spindle element 47 depending on a rotational movement of the retaining element 39. The torsion spring has two legs. A first leg is connected to the preloading element 77 by way of a form fit and is arranged in an axially extending shaped cutout 109 in the preloading element 77. A second leg is connected indirectly or directly to the spindle element 47 by way of a form fit, in particular for conjoint rotation, and is arranged in an axially extending further shaped cutout.