Quick clamping device
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.
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.