US-12623315-B2 - 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.

Inventors

• Daniel Barth

Assignees

• ROBERT BOSCH GMBH

Dates

Publication Date

20260512

Application Date

20201210

Priority Date

20191223

Claims (19)

1. 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. 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. 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. 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. 5 . A hand-held power tool comprising: the quick clamping device as claimed in claim 1 .
6. 6 . The quick clamping device as claimed in claim 1 , wherein the hand-held power tool is an angle grinder.
7. 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. 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. 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. 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. 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. 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. 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. 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. 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. 16 . The quick clamping device as claimed in claim 14 , wherein the clamping unit has a first sloping element.
17. 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. 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. 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

This application is a 35 U.S.C. § 371 National Stage Application of PCT/EP2020/085579, filed on Dec. 10, 2020, which claims the benefit of priority to Serial No. DE 10 2019 220 539.9, filed on Dec. 23, 2019 in Germany, the disclosures of which are incorporated herein by reference in their entirety. The disclosure relates to a quick clamping device. BACKGROUND DE 10 2012 007 926 A1 relates to a power-driven hand tool having a housing having a spindle head, having a tool spindle that is drivable about its longitudinal axis, in particular that is drivable in rotational oscillation, wherein the tool spindle has a tool-side end with a retaining portion for a tool to be driven, and having a clamping device, having a fastening element, wherein the clamping device has a clamping configuration, in which the tool is able to be fixed to the tool spindle by means of the fastening element, and a releasing configuration, in which the tool is detachable, and wherein the clamping device is able to be switched over between the clamping configuration and the releasing configuration by means of a codirectional adjusting movement. SUMMARY The disclosure is based on the object of improving a quick clamping device with simple design measures. The object is achieved by a quick clamping device for arranging an accessory device on a hand-held power tool, in particular on an angle grinder, having an output unit for moving the accessory device about an output axis A of the output unit and having a retaining unit, having in particular a retaining element, for retaining the accessory device on the hand-held power tool. It may be expedient when the retaining unit has a retaining parameter which changes in a retaining state, in particular during a transition from a retaining state into a clamping state. The retaining unit may be 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. By way of the quick clamping device according to the disclosure, an accessory device can be received and retained on the hand-held power tool in a particularly reliable and quick way. Particularly preferably, accessory devices with different thicknesses of a receiving region can be reliably received and clamped. It is also possible to ensure that accessory devices with different thicknesses can be retained with in each case a more or less uniform clamping force on the quick clamping device. Furthermore, a particularly high level of operating comfort can be achieved in that easy mounting and/or removal of an accessory device on and/or from the quick clamping device or the hand-held power tool is allowed. In addition, the accessory device can be attached to the quick clamping device and removed therefrom again in a particularly time-saving manner without it being necessary to dispense with secure reception of the accessory device. Furthermore, the accessory device can be retained particularly reliably on the quick clamping device, such that the accessory device is secured against detaching by itself and/or unintentionally. As a result of a change in a retaining parameter, the accessory device can be transferred particularly easily from a retaining state into a clamping state. The retaining parameter of the retaining unit can be intended to transfer the retaining unit, for example by means of a rotary movement, from a releasing state into a retaining state, in particular in order to retain the accessory device on the quick clamping device or on the hand-held power tool. Furthermore, the retaining parameter of the retaining unit can be intended to transfer the retaining unit, for example by means of a movement in translation along the output axis, from a retaining state into a clamping state, in particular in order to clamp the accessory device to the quick clamping device or to the hand-held power tool. Particularly advantageously, separation of the functions can be achieved as a result, in that the retaining unit is transferred from a releasing state into a retaining state, in order to retain the accessory device on the quick clamping device or on the hand-held power tool by way of a form fit, and in that the retaining unit is transferred from a retaining state into a clamping state, in order to clamp the accessory device in particular along the output axis. As a result of a retaining parameter of the retaining unit being changed in a retaining state, a direction of movement of the retaining unit, in particular of the retaining element, can be changed. A retaining parameter should be understood as meaning in particular a degree of freedom of movement which preferably forms, in the mechanical sense, a number of the mutually independent possible movements. The retaining parameter can define a movement, in particular a direction of movement, of at least one retaining element. The retaining parameter can define a rotary movement about the output