Quick clamping device

Abstract

The invention relates to a quick clamping device for arranging an accessory device (17) on a hand-held power tool (13), in particular an angle grinder, having an output unit (33) for moving the accessory device (17) about an output axis (A) of the output unit (33) and a holding unit (37), in particular having a holding element (39), for holding the accessory device (17) on the hand-held power tool (13). The invention proposes that the holding unit (37) has a holding parameter which changes in the holding state, in particular when transitioning from the holding state into a clamping state.

Description

Technical Field

[0001] The present invention relates to a quick clamping device as described in the preamble of claim 1. Background Technology

[0002] DE 10 2012 007 926 A1 relates to a force-driven handheld tool having a housing with a spindle head; a tool spindle capable of being driven about its longitudinal axis, particularly by rotational oscillation, wherein the tool spindle has a tool-side end having a holding section for the tool to be driven; and having a clamping device and a fastening element, wherein the clamping device has a clamping mode and a releasing mode, in which the tool can be fixed to the tool spindle by means of the fastening element, and in which the tool can be released, and wherein the clamping device can switch between the clamping mode and the releasing mode by means of an actuating motion in the same direction. Summary of the Invention

[0003] The objective of this invention is to improve the quick clamping device using simple structural design measures.

[0004] This task is accomplished by a quick clamping device for arranging the accessory device on a handheld machine tool, particularly an angle grinder, the clamping device having an output unit for moving the accessory device about the output axis A of the output unit, and a holding unit for holding the accessory device on the handheld machine tool, the holding unit having a holding element.

[0005] Ideally, the holding unit should have holding parameters that change during the holding state, especially during the transition from the holding state to the clamping state.

[0006] The holding unit can be configured such that the holding parameters are changed in the holding state of the holding unit, especially when transitioning from the holding state to the clamping state.

[0007] The quick-clamping device according to the invention can receive and hold accessory devices on a handheld machine tool with particular reliability and speed. Particularly preferably, it can reliably receive and clamp accessory devices with receiving areas of different thicknesses. It can also ensure that accessory devices of different thicknesses are held on the quick-clamping device with approximately uniform clamping force.

[0008] Furthermore, exceptionally high operational comfort is achieved through the ability to easily assemble and / or disassemble attachments on quick-clamping devices or handheld machine tools. Additionally, attachments can be installed on quick-clamping devices and removed again with remarkable time-saving efficiency, without compromising reliable reception of the attachments.

[0009] In addition, the accessory device can be held particularly reliably on the quick clamping device, thereby securing the accessory device against voluntary and / or accidental release.

[0010] By changing the holding parameters, the accessory device can be transferred from a holding state to a clamping state very easily. The holding parameters of the holding unit can be set to transfer the holding unit from a released state to a holding state, for example by rotational movement, particularly to hold the accessory device in a quick-clamping device or handheld machine tool. Furthermore, the holding parameters of the holding unit can be set to transfer the holding unit from a holding state to a clamping state, for example by translational movement along the output axis, particularly to clamp the accessory device onto the quick-clamping device or handheld machine tool. It is particularly advantageous to achieve functional separation here: by transferring the holding unit from a released state to a holding state, the accessory device is form-locked onto the quick-clamping device or handheld machine tool; and by transferring the holding unit from a holding state to a clamping state, the accessory device is clamped, particularly along the output axis. By changing the holding parameters of the holding unit in the holding state, the direction of movement of the holding unit, especially the holding element, can be changed.

[0011] The holding parameters should be understood in particular as degrees of freedom of motion, which preferably form multiple independent motion possibilities in a mechanical sense. The holding parameters can determine the motion of at least one holding element, especially the direction of motion. The holding parameters can determine rotational motion about the output axis. The holding parameters can determine translational motion along the output axis. Changes in the holding parameters can be achieved, for example, by preventing or stopping rotational motion about the output axis and / or releasing or initiating translational motion along the output axis. The holding unit is preferably configured to control the holding motion of the holding unit, especially the variation of the holding motion, particularly during the transition from a holding state to a clamping state. The holding parameters can be changed, especially, during the transition from a holding state to a clamping state.

[0012] The retaining unit can be configured to hold the accessory device in a form-locking and / or force-locking manner on a quick clamping device or hand-held machine tool.

[0013] The retaining unit may have at least two elements that are movably supported relative to each other in at least one state. These two elements may be arranged relative to each other such that the accessory device is held axially on the quick-clamping device. These two elements may be configured to transmit a clamping force to the accessory device via the clamping unit. Preferably, the clamping force corresponds to at least one retaining force configured to hold the accessory device on the clamping unit, particularly on the quick-clamping device, during operation on the quick-clamping device or handheld machine tool. These two elements may be movably supported relative to each other in the axial direction along the output axis to clamp the accessory device axially. The retaining unit may have a retaining element. The retaining element may be configured to engage through the accessory device, particularly a slotted part of the accessory device, and to form-lock and / or force-lock the accessory device on the quick-clamping device or output unit. The retaining element may have a retaining wing, which preferably extends outward in a direction radially relative to the output axis. The retaining element may be movably supported in the axial direction along the output axis to clamp or release the accessory device by means of axial movement. The retaining element may have a retaining profile that substantially corresponds to the receiving slot of the accessory device, particularly the receiving profile of the receiving slot. The retaining profile may be outlined by the profile of a retaining wing. The retaining profile may be constructed substantially corresponding to the receiving profile. The retaining profile may be constructed smaller than the receiving profile. The retaining element may be configured such that the retaining profile engages with the receiving profile to allow the retaining element to be inserted through the receiving slot of the accessory device. The retaining element may be configured to engage and retain the accessory device through the receiving slot by means of the retaining wing. In particular, the retaining element may be rotated relative to the receiving slot such that the retaining wing and the accessory device form a form-locking engagement. The retaining profile may be oriented relative to the receiving profile such that it covers the receiving profile in a first rotational position, allowing the retaining element to be inserted through the receiving slot, and that in a second rotational position about the output axis, the retaining profile overlaps with the receiving profile of the receiving slot.

[0014] The output unit is preferably configured to transmit rotational and / or oscillating motion about the output axis to an accessory device held on the output unit by means of a retaining unit. Preferably, the output unit is operatively connected to the drive unit of the hand-held machine tool in a manner known to those skilled in the art, particularly via at least one drive pinion of the drive unit. The output unit particularly includes at least one sleeve and / or at least one hollow shaft, particularly a hollow spindle. Preferably, the rotational and / or oscillating motion of the output unit can be generated based on the interaction between the output unit of the hand-held machine tool and the drive unit comprising at least one electric motor. In particular, the retaining element is non-removably mounted. This should be understood in particular as the components, particularly the retaining element, are arranged in a loss-proof manner on at least one additional component of the output unit, and / or preferably, cannot be separated from the output unit, especially in the functional and / or ready-to-operate state of the quick-clamping device, particularly in the released state (relaxed state) and in the clamped state (clamped state) of the quick-clamping device. Preferably, the retaining element is arranged in a loss-proof manner on the output unit. In particular, the retaining element and / or each additional component arranged on the output unit in a way that prevents loss are anti-loss connected to the output unit in a way that prevents loss, especially in the open and / or closed states of the quick-clamping device. Specifically, depending on the rotational position of the retaining element, the retaining element should be able to be inserted through the accessory device and form a form-lock with the accessory device, especially in the axial direction along the output axis, when the rotational position changes. The "released state" of the quick-clamping device should be understood in particular as a state of the quick-clamping device configured to release the accessory device arranged on the quick-clamping device for disassembly and / or release the quick-clamping device for mounting the accessory device on the quick-clamping device. The released state may constitute the bottom dead center of the quick-clamping device. The "retained state" of the quick-clamping device should be understood in particular as a state of the quick-clamping device in which the accessory device is form-locked onto the output unit of the quick-clamping device or handheld machine tool and is preferably secured against dislodgement. The "clamping state" of the quick-clamping device should be understood in particular as a state in which the accessory device is preferably transferred to a fixed position on the output unit by means of a clamping movement and / or is ready to be operated and fixed on the output unit. The clamping state can constitute the top dead center of the quick-clamping device, in which the accessory device is clamped on the output unit. Preferably, the accessory device can be ready to be operated and fixed on the output unit and / or cannot be removed from the output unit, especially without damage. In particular, the holding state can include the clamping state. In particular, the clamping state can form a special type of clamping state, by which the clamping state also includes the function of holding the accessory device. The holding element, especially in the clamping state of the quick-clamping device, is configured to generate force locking and / or form locking for holding the accessory device, especially the grinding disc, on the quick-clamping device.The clamping state should be understood in particular as the quick-clamping device generating a clamping motion to produce a force-locking and / or form-locking for retaining the accessory device. Preferably, the retaining element produces a form-locking, particularly axial, preferably by pressing at least a portion of the accessory device against at least a portion of the output unit. It is conceivable that the retaining element, in particular in addition to the axial form-locking, also produces a form-locking in the radial and / or circumferential direction, wherein the circumferential direction lies in a plane whose surface normal extends parallel to the output axis. In particular, the accessory device is fixed to the quick-clamping device without tools. "Fixed without tools" should be understood in particular as the arrangement process on the quick-clamping device and / or the switching between the release and clamping states can be achieved without relying on the use of external tools, such as wrenches, Allen wrenches, etc. The retaining element is particularly movably supported relative to the output unit by means of translation along and / or rotation about the output axis in the axial direction, wherein, preferably, the axis of motion, particularly the axis of rotation, of the retaining element is at least substantially coincident with the output axis. The output unit at least partially surrounds the retaining element, particularly along a circumferential direction in a plane whose surface normal extends at least substantially parallel to the output axis. Preferably, the output unit includes a hollow shaft for at least partially receiving the retaining element. In particular, this quick-clamping device can be advantageously implemented compactly, thereby enabling the assembly of small insert tools, such as those with a diameter of 100 mm or less.

[0015] The accessory device can be configured as a grinding disc and / or a dividing disc.

[0016] The dependent claims provide other suitable extensions of the quick-clamping device according to the invention.

[0017] It is desirable that the retaining unit, especially the retaining element, is supported substantially rotatably about the output axis in the retaining state and / or substantially movable along the output axis in the clamping state. Furthermore, it is desirable that the retaining unit, especially the retaining element, has a clamping state in which the retaining element is supported substantially movable along the output axis. In the retaining state, the retaining unit is rotatable about the output axis and / or movable along the output axis. In the clamping state, the retaining unit is rotatable about the output axis and / or movable along the output axis. In particular, the retaining unit cannot be rotatably supported about the output axis or cannot be movable along the output axis in either the retaining or clamping state. Functional separation can be achieved by, for example, the retaining unit being rotatably supported about the output axis in the retaining state or being rotatable about the output axis and movable along the output axis. Furthermore, functional separation can also be achieved by, for example, the retaining unit being movable along the output axis in the clamping state or being movable along the output axis and rotatable about the output axis. Here, the holding parameters can be changed by altering the degrees of freedom of the holding unit, particularly the holding element, for example, by preventing rotational motion and releasing translational motion. Ideally, in the holding state of the holding unit, the movement of the holding element, particularly the holding element, relative to the spindle element along the output axis is prevented. The holding element can be movably supported about the output axis from the released state to the clamping state, or even up to the clamping state. In the clamping state, the holding element can be movably supported along the output axis.

[0018] Furthermore, to achieve the desired effect, when the holding unit is clamped, the movement of the holding element, particularly the holding element relative to the spindle element about the output axis, is prevented. The holding element can be movably supported along the output axis from the released state to the transition from the holding state to the clamped state, or even up to the clamped state. In the holding state, the holding element can be movably supported about the output axis.

[0019] Preferably, the retaining element is movably supported relative to the spindle element so as to transfer the quick clamping device from the released state to the clamped state.

[0020] This ensures that the movement required for the function of the corresponding state is released and that unnecessary or forced movement is prevented.

[0021] To secure the accessory device, the retaining unit, particularly the retaining element, can rotate an angle about the output axis from the released state (bottom dead center) to the clamped state (top dead center). This angle can include a range of 0° to 25°, especially up to 30°, preferably up to 40°, advantageously up to 50°, particularly preferably up to 55°, more preferably up to 60°, and even more preferably up to 65°. For example, the angle can include a range of 0° to 40°, preferably with a tolerance of +20 to -10°. For example, the angle can include a range of 0° to 32°, preferably with a tolerance of + / -8°. For example, the angle can include a range of 0° to 48°, preferably with a tolerance of + / -16°.

[0022] Ideally, the retaining unit has a retaining element configured to engage and clamp the accessory device through it. The retaining element can extend through the accessory device, particularly in the released state, and can rotate relative to the accessory device, for example, by means of rotational movement about the output axis, in the retained state, to forcefully lock the accessory device in place. The retaining element can preferably have a retaining wing extending radially relative to the output axis. The retaining wing can be configured to surround the accessory device, at least in an inclined section. The retaining wing can be configured to apply a clamping force to the accessory device. The retaining wing can have a retaining surface extending along a radial plane of the output axis. Thus, the accessory device can be connected to the quick-clamping device, especially the output unit, in a particularly simple and reliable manner.

[0023] Furthermore, it is desirable that the retaining unit be configured to transfer the accessory device from a released state to a retained state or a clamped state by means of the rotational movement of the retaining unit, in particular the retaining element, relative to the spindle element about the output axis A.

[0024] Ideally, the quick-clamping device includes a clamping unit, particularly a clamping element, configured to move the holding unit, particularly the holding element, axially along the output axis A. The clamping unit may be coupled to the holding unit. The clamping unit may be configured to clamp the accessory device axially, particularly from a holding state to a clamped state.

[0025] The clamping unit can be configured to transmit clamping force, particularly axially along the output axis, to the accessory device. The clamping unit can have a clamping element configured to control the axial movement of the retaining unit, particularly the retaining element. The clamping unit can be configured to clamp the accessory device, particularly the clamping element, in the axial direction along the output axis by means of the movement or rotational movement of the clamping element about the output axis.

[0026] The clamping unit may have additional clamping elements configured to interact directly or indirectly with the clamping element. The clamping element and the additional clamping elements may form threads or bevels configured to transmit clamping force, particularly axially along the output axis, to the attachment device. The additional clamping elements may be movably supported relative to the clamping element. The additional clamping elements may be constructed on other elements of the clamping unit.

[0027] Furthermore, it is desirable for the clamping unit to have a ramp element, particularly constructed as a threaded element or a sloping element. A ramp element should be understood in particular as an element having a ramp, especially in the circumferential direction about the output axis. For example, the ramp element can form a thread or a threaded section. The ramp element can be constructed in the manner of a wedge element. The ramp element can be configured to convert, for example, movement along the ramp element or in the circumferential direction about the output axis into movement transverse to, especially perpendicular to, the ramp element or in the axial direction along the output axis. The ramp element can have a varying or constant slope. The ramp element can be constructed to rise monotonically, especially strictly monotonically.

[0028] The clamping unit may have a single ramp element or multiple ramp elements. Ramp elements may be connected to each other circumferentially. Ramp elements may be arranged in series circumferentially. Ramp elements may be arranged parallel to each other. Ramp elements may be spaced apart circumferentially. The ramp elements may be defined by two radial planes that extend radially relative to the output axis and / or are arranged parallel to each other. In particular, these two radial planes may define each first ramp element. Preferably, the spacing between the two radial planes may be defined by the maximum axial extension dimension of one or more ramp elements or by the ramp section of the ramp element. The two radial planes may have a spacing relative to each other that substantially corresponds to the maximum axial movement of the holding element along the output axis from the released state to the clamped state.

[0029] Furthermore, it is desirable that the ramp element has a first ramp section and a second ramp section angled to the first ramp section. The first ramp section can extend in the radial plane of the output axis. The first ramp section can be constructed flat. The first ramp section can preferably have no slope in the circumferential direction about the output axis. The first ramp section can extend particularly entirely along the radial plane of the output axis. It is conceivable that the first ramp section is angled to the radial plane of the output axis. The second ramp section can also be angled to the radial plane of the output axis. By means of the ramp element, especially the first and second ramp sections of the ramp element, the holding parameters of the holding unit can be changed.

[0030] Furthermore, it is desirable for the clamping unit to have an additional ramp element, particularly configured as a threaded element or a beveled element. This additional ramp element can be associated with the aforementioned ramp element. The additional ramp element can be substantially similar in construction to the aforementioned ramp element. The additional ramp element can be configured to interact directly or indirectly with the aforementioned ramp element. The additional ramp element can be configured to contact the aforementioned ramp element. The additional ramp element can be movably supported relative to the aforementioned ramp element in a circumferential direction about the output axis and / or in an axial direction along the output axis. The additional ramp element can be configured to be slidably supported relative to the aforementioned ramp element.

[0031] The ramp element and the other ramp element can form a thread or a ramp.

[0032] The ramp element can be arranged on the clamping element. The ramp element can be integrally constructed with the clamping element. Additional ramp elements can be arranged on additional clamping elements. Additional ramp elements can be integrally constructed with additional clamping elements. This allows for targeted adjustment of the desired clamping force.

[0033] Ideally, the clamping element and the retaining element should be constructed integrally. The clamping element can be constructed as a separate clamping ring coupled to the retaining element. The clamping element can limit the retaining element in a radial direction relative to the output axis. The clamping element can be constructed integrated with the retaining element. The clamping element can surround the retaining element 360° in at least one plane. The clamping element can be arranged concentrically relative to the retaining element. The clamping element can be arranged on the retaining element. The clamping element can be constructed as a separate component capable of being connected to the retaining element, particularly in a torsional manner. The clamping element can be constructed as a separate component connected to the retaining element by means of fastening devices such as, for example, fastening screws. The clamping element can be constructed in a disc shape. The clamping element can be fixedly connected to the retaining element, thereby preventing relative movement (rotational movement, translational movement) between the two elements. The clamping element can be connected to the retaining element in a torsional manner. The clamping element can be configured to clamp the retaining unit by means of the relative rotational movement of the clamping element relative to another element of the clamping unit, such as another clamping element. The clamping element can be arranged on the side of the retaining element away from the accessory device, and the clamping element can limit the axial extension dimension of the retaining element along the output axis. As a result, the clamping unit can be constructed in a particularly compact manner.

[0034] Furthermore, it is desirable that the quick-clamping device, particularly the retaining unit, has a spindle element configured to interact with the retaining element, especially by means of the clamping unit. The spindle element can be configured to drive the accessory device about the output axis. The spindle element can contact the accessory device directly or indirectly. The spindle element can have a support element, particularly a support surface, which serves as a support for the accessory device in the axial direction along the output axis. The spindle element can be constructed as a spindle sleeve. The spindle element can surround the retaining element 360° in a plane. The spindle element can be configured to provide torsional support for the accessory device, at least in the clamped state, in the circumferential direction about the output axis.

[0035] The spindle element may have an additional clamping element associated with the clamping element. This additional clamping element may be integrally constructed with the spindle element. The additional clamping element may be constructed as a threaded element or a beveled element. The additional clamping element may limit the radial extension dimension of the spindle element.

[0036] The retaining unit, particularly the spindle element, may have a carrying element configured to drive or rotate the accessory device, particularly about the output axis. The carrying element may be configured as a rotary carrying element. The carrying element may be configured to engage through the accessory device and / or form a form lock with it.

[0037] Furthermore, it is desirable that the quick-clamping device has a cam drive configured to move the retaining unit, particularly the retaining element, in a rotational direction about the output axis. The cam drive can be configured to move the retaining unit, particularly the retaining element, back and forth between two end positions. In particular, one of the end positions can preferably be a position that can be secured by a locking unit. Advantageous force transmission and / or force conversion can be achieved in particular. User-friendliness can be advantageously improved, especially by converting simple operating actions, such as pressing a button and / or adjusting a lever, into more complex movements of the retaining element, such as rotational movements. In particular, the cam drive is configured to at least partially convert the linear movement of the unlocking bolt of the quick-clamping device, particularly, into rotational movement of the retaining element, particularly. "End position" should be understood in particular as a position in an open state and / or a position in a closed state. "Position that can be secured by a locking unit" should be understood in particular as a position in an open state. Preferably, the "cam drive" is configured to convert linear movement into movement at least partially different from linear movement, such as rotational movement, or to convert movement at least partially different from linear movement into linear movement.

[0038] Furthermore, to achieve the desired effect, the cam drive includes a guide unit configured to control the movement, particularly rotational movement, of the retaining unit, especially the retaining element, relative to the spindle element. The guide unit has a guide slot configured to guide a locating pin, particularly axially along the output axis. The guide slot may have a trajectory curve with an angled course relative to the output axis. A clamping pin can be guided in the guide slot such that it controls the clamping unit or retaining unit. This allows for advantageous force transmission and / or force conversion. Advantageously, a component can be forced to move relative to the output unit using this cam drive. The guide unit may have multiple guide slots, which may have straight, helical, or other curved courses.

[0039] A cam drive mechanism can have multiple cam drive elements. Each of these cam drive elements can have a guide slot. These guide slots can be configured with guide pins. The guide slots can be used to control the rotational movement of the retaining unit about the output axis. The movement of the cam drive elements can be coupled using the guide slots.

[0040] In particular, the interaction between the guiding unit and the clamping unit causes the holding unit to be controlled, especially from the released state to the clamping state, preferably from the holding state to the clamping state.

[0041] To achieve the desired effect, the clamping unit may have an additional ramp element, particularly configured as a threaded element or a beveled element. The additional ramp element may be configured spaced apart from the stated ramp element. The additional ramp element may be configured as a threaded element.

[0042] Additional ramp elements can be arranged on the preload element. Additional ramp elements can be integrally constructed with the preload element. Additional ramp elements can surround the preload element, especially in a 360° plane.

[0043] Ideally, the quick-clamping device should have a preload element configured to control the holding parameters of the holding unit. The preload element is configured to interact with the holding unit, particularly with the holding element and the spindle element. The preload element may have one or more clamping elements. The preload element may also have an additional ramp element, which is particularly constructed as a threaded element or a beveled element.

[0044] The clamping element ensures that the accessory device is securely and quickly locked onto the retaining unit. The retaining parameters can be controlled particularly reliably, especially with the aid of a cam drive and clamping unit. Furthermore, the combination of the cam drive and clamping unit results in adjustable adaptability of the retaining unit.

[0045] Ideally, the translational movement of the retaining unit, particularly the retaining element, along the output axis from the holding state to the clamping state and then to the holding state should be greater than the translational movement of the retaining unit from the releasing state to the clamping state. Preferably, the translational movement of the retaining unit between the releasing and clamping states can be prevented and released in the clamping state. In this case, the movement should be understood in particular as the movement of the retaining unit, particularly the retaining element, relative to the spindle element. To move from the releasing state to the clamping state, the retaining element can move solely by rotational movement, thus holding the accessory tool on the handheld machine tool. This allows for particularly reliable holding and clamping of the accessory device.

[0046] Furthermore, it is desirable that the rotational movement of the retaining element about the output axis from the released state to the transition from the retained state to the clamped state is greater than the rotational movement from the retained state to the clamped state of the retaining unit. Preferably, the rotational movement of the retaining element can be prevented in the clamped state and released from the released state to the transition from the retained state to the clamped state.

[0047] Ideally, the preload element surrounds the retaining element, particularly circumferentially around the output axis. Furthermore, ideally, the preload element is constructed as a substantially hollow cylinder. The preload element can form a preload sleeve. The preload element can be movably supported relative to the retaining element and / or the spindle element, particularly in the retained state. The preload element can be preloaded axially relative to the retaining element. The preload element can be arranged on the retaining element. The preload element can be constructed to be non-rotatable relative to the retaining element. The preload element can be surrounded by the spindle element. The preload element can be preloaded circumferentially relative to the spindle element around the output axis. The preload element can have a main extension dimension extending along the output axis. The retaining parameters of the retaining unit can be controlled in a particularly advantageous manner by means of the preload element. Furthermore, functional separation can be achieved by the preload element causing the retaining element, particularly by rotational movement, to move from the retained state to the retained state on one hand, and particularly by translational movement on the other hand, to move from the retained state to the clamped state.

[0048] Ideally, the retaining unit has a spindle element and a retaining element, wherein a preload element is arranged between the spindle element and the retaining element. The preload element may surround the retaining element. The preload element may be surrounded by the spindle element. The preload element may be arranged concentrically relative to the spindle element and / or the retaining element. This allows for the formation of a particularly compact, quick-clamping device.

[0049] Furthermore, it is desirable that the preload element is coupled to the retaining element and the spindle element. The preload element can be configured to interact with the spindle element and the retaining element. The preload element can be configured to clamp the retaining unit relative to the spindle unit in a clamped state in the axial direction along the output axis. Furthermore, it is desirable that the quick-clamping device has a clamping element configured to move the retaining unit, particularly the retaining element, axially along the output axis A. The clamping element can have a threaded element or a chamfered element. The preload element can have a corresponding clamping element. This corresponding clamping element can be integrally constructed with the preload element. The corresponding clamping element can be constructed as a threaded element, particularly an internal thread, and / or a chamfered element. The corresponding clamping element can limit the preload element in the radial direction relative to the output axis and / or in the axial direction along the output axis.

[0050] Furthermore, it is desirable for the preload element to have an additional clamping element integrally constructed with it. This additional clamping element may have a threaded element, particularly an external thread or a beveled element. The additional clamping element may be coupled to the spindle element. The spindle element may have an additional clamping element corresponding to the aforementioned additional clamping element. This corresponding additional clamping element may be integrally constructed with the spindle element. The corresponding additional clamping element may be constructed as a threaded element, particularly an internal thread. The corresponding additional clamping element may limit the spindle element in the radial direction relative to the output axis and / or in the axial direction along the output axis. This enables a particularly simple coupling between the retaining element and the spindle element.

[0051] Furthermore, it is proposed that the quick-clamping device has a spring element configured to preload the clamping unit, particularly the retaining element, relative to the preload element and / or the spindle element. The spring element can be configured as a tension / compression spring. The spring element can be configured as a torsion spring. The spring element surrounds the retaining element 360° in a plane. The spring element can be configured to place the handheld machine tool in a tensioned state. This allows for a particularly simple reset. This allows for a constant preload force.

[0052] The quick-clamping device may have a spring element configured to preload the retaining element relative to a preload element and / or a spindle element in the released state. The spring element may be configured as a tension / compression spring. The spring element may be supported within a cavity of the retaining element. The spring element may be configured to preload a clamping pin or unlocking pin. The spring element may be preloaded more forcefully in the released state than in the clamped state.

[0053] The quick-clamping device may have another spring element configured to preload the preload element relative to the spindle element in a circumferential direction about the output axis. This other spring element may be constructed as a torsion spring. The torsion spring may surround the retaining element 360° in a plane. The other spring element may be configured to tension the preload element relative to the spindle element in the clamped state. The other spring element may be tensioned more strongly in the clamped state than in the released state. The torsion spring may be preloaded or relaxed according to the rotational movement of the retaining element relative to the spindle element.

[0054] In the clamped state, the preload element can be preloaded by means of a spring element, especially a torsion spring, in the axial direction along the output unit or in the circumferential direction around the output axis. Furthermore, it is desirable to preload the preload element in the released and / or held and / or clamped states by means of a spring element, especially a torsion spring, in the circumferential direction around the output axis.

[0055] The present invention also relates to a handheld machine tool, particularly an angle grinder, having a quick clamping device for operating attachments. Attached Figure Description

[0056] Further advantages are illustrated in the following figures. Embodiments of the invention are shown in the figures. The figures, description, and claims comprise combinations of multiple features. Those skilled in the art will also consider these features individually and summarize them into other meaningful combinations. This is shown here:

[0057] Figure 1 A perspective view of a handheld machine tool having a quick clamping device according to the present invention;

[0058] Figure 2 , 3 Cross sections of the handheld machine tool are shown respectively;

[0059] Figure 4 Two states of the quick-clamping device;

[0060] Figure 5 Cross-section of the quick-clamping device;

[0061] Figure 6 Show Figure 5 Exploded view of the quick-clamping device;

[0062] Figures 7 to 9 Multiple states of the quick-clamping device;

[0063] Figure 10 An expansion scheme for the quick-clamping device;

[0064] Figures 11 to 14 An extension scheme for the quick clamping device.

[0065] In the following figures, the same components are given the same reference numerals. Detailed Implementation

[0066] Figure 1 A machine tool system with a handheld machine tool 13 is shown, the handheld machine tool having a housing 15 and an accessory device 17. The handheld machine tool 13 is configured as an angle grinder. The accessory device 17 is configured as a grinding disc and / or a dividing disc. The accessory device 17 has a connecting device 19 (see...). Figure 4 The connecting device 19 is configured as a continuous receiving slot 21.

[0067] The handheld power tool 13 has a quick-clamping device 23, which is configured to arrange the accessory device 17 on the handheld power tool 13. The handheld power tool 13 has an operating device 25 for opening and closing the quick-clamping device 23. The operating device 25 is constructed as a lever 54. The lever 54 has an eccentric wheel 27. The operating device 25 is configured, in particular by means of the eccentric wheel 27, to move the unlocking bolt 29 of the quick-clamping device 23 in the axial direction (see...). Figure 2 , 3 The unlocking bolt 29 is configured to unlock the quick-clamping device 23 when it moves into the housing 15 of the machine tool 12. When the quick-clamping device 23 is locked, the unlocking bolt 29 moves out of the housing 15 of the machine tool 12. Figure 1 The operating device 25 shown is in the off state. The machine tool 12 has a drive unit 31, which is configured to provide kinetic energy to move, in particular rotate, the accessory device 17. The drive unit 31 is arranged in the housing 15. The drive unit 31 is constructed as an electric motor, and more particularly as an EC motor.

[0068] The quick-clamping device 23 has an output unit 33 for moving the accessory device 17 about the output axis A of the output unit 33. A drive unit 31 drives the output unit 33 to move the accessory device 17 about the output axis A. The output unit 33 is configured to transmit rotational and / or oscillating motion about the output axis A to the accessory device 17 held on the output unit 33 by means of a holding unit 37. The output unit 33 is connected via a drive pinion of the drive unit 31. The output unit 33 includes a spindle element 47 constructed as a hollow shaft, particularly a hollow spindle.

[0069] Furthermore, the quick clamping device 23 has a holding unit 37 with a holding element 39 for holding the accessory device 17 on the handheld machine tool 13. The holding unit 37 can be adjusted such that the holding parameters can be changed when the holding unit 37 is in the holding state, especially when transitioning from the holding state to the clamping state.

[0070] By changing the holding parameters, the accessory device 17 can be transferred from the holding state to the clamping state very easily. The holding parameters of the holding unit 37 are set such that the holding unit 37, by means of rotational movement ( Figure 10 , Figure 11 (and below) or by means of rotation and translation ( Figures 2 to 9 The device transitions from the released state to the holding state to retain the accessory device 17 on the quick-clamping device 23. Here, the holding unit 37, or holding element 39, is rotatable in the holding state. Figure 10 , Figure 11 (and below) or rotatable and translatable ( Figures 2 to 9 )Motion support or forced guidance.

[0071] Furthermore, the holding parameters of the holding unit 37 can be adjusted or changed in such a way that the holding unit 37 can be transferred from a holding state to a clamping state by means of translational movement, so as to clamp the accessory device 17 onto the quick clamping device 23. Here, the holding unit 37, or the holding element 39, can be translated in the clamping state ( Figures 2 to 9 ; Figure 10 ) or can be rotated and translated ( Figure 11 (and below) is supported or forcibly guided by movement. Functional separation can be particularly advantageously achieved by changing the holding parameters of the holding unit 37 in the holding state, which can change, in particular, the direction of movement of the holding element 39 of the holding unit 37, preventing or releasing movement. For example, when transitioning from the holding state to the clamping state, the relative rotational movement of the holding element about the output axis A and the relative translational movement along the output axis A can be changed to a relative translational movement along the output axis A. Figures 2 to 9 For example, during the transition from the holding state to the clamping state, the relative rotational motion of the holding element 39 about the output axis A can be changed to a relative translational motion along the output axis A. Figure 10 For example, during the transition from the holding state to the clamping state, the relative rotational motion of the holding element 39 about the output axis A can be changed to a relative rotational motion about the output axis A and a relative translational motion along the output axis A. Figure 11 (and below).

[0072] The parameter should be understood as maintaining the degree of freedom of motion of element 39.

[0073] The retaining element 39 is configured to hold the accessory 17 in a form-locking manner on the quick clamping device 23.

[0074] In addition to the retaining element 39, the retaining unit 37 also has a spindle element 47. The retaining element 39 is movably supported relative to the spindle element 47 in one state. The retaining element 39 and the spindle element 47 are arranged relative to each other such that the accessory device 17 is held on the quick clamping device 23 in the axial direction along the output axis A. The retaining element 39 and the spindle element 47 are configured to transmit a clamping force to the accessory device 17 by means of the clamping unit 51. The clamping force preferably corresponds to at least one retaining force configured to hold the accessory device 17 on the quick clamping device 23 in the operating state of the quick clamping device 23 or the handheld machine tool 13. The retaining element 39 and the spindle element 47 are movably supported relative to each other in the axial direction along the output axis A so as to clamp the accessory device 17 in the axial direction.

[0075] The spindle element 47 surrounds the retaining element 39 in a circumferential direction, which lies in a plane whose surface normal extends at least substantially parallel to the output axis A. The spindle element 47 is constructed as a hollow shaft so as to at least partially receive the retaining element 39.

[0076] The retaining element 39 is configured to engage through the receiving slot 21 of the accessory device 17 and form-lockedly hold the accessory device 17 onto the quick-clamping device 23. The retaining element 39 has a plurality of, particularly four, retaining wings 53 that extend radially outward relative to the output axis A. The retaining element 39 has a retaining profile 55 that substantially corresponds to the receiving profile 57 of the receiving slot 21 of the accessory device 17. The retaining profile 55 is outlined by the profiles of the retaining wings 53. The retaining profile 55 is constructed substantially corresponding to and smaller than the receiving profile 57 so that the retaining wings 53 can engage through the receiving slot 21. The retaining element 39 is configured such that the retaining profile 55 engages through the receiving profile 57 so that the retaining element 39 can be inserted through the receiving slot 21 of the accessory device 17. The retaining element 39 is configured to engage and hold the accessory device 17 through the receiving slot 21 of the accessory device 17 by means of the retaining wings 53. The retaining element 39 can rotate relative to the receiving slot 21 such that the retaining wing 53 forms a form-locking engagement with the accessory device 17. The retaining profile 55 can be oriented relative to the receiving profile 57 such that in the first rotational position ( Figure 13 The retaining contour 55 covers the receiving contour 57, allowing the retaining element 39 to be inserted through the receiving slot 21 and rotated about the output axis A to a second rotational position. Figure 14 When the receiving profile 55 overlaps with the receiving profile 57 of the receiving slot 21, the retaining element 39 can be inserted through the accessory tool according to the rotational position of the retaining element 39, and form a form lock with the accessory device 17, especially in the axial direction along the output axis A, when the rotational position changes.

[0077] Keep element 39 in the released state ( Figure 9 ), in the state of ( Figure 8 ) and in the clamping state, especially in the clamping state ( Figure 7 It is non-detachably connected to the quick-clamping device 23. The retaining element 39 is supported relative to the spindle element 47 in an axial direction, translating and / or rotating about the output axis A, wherein the axis of motion, particularly the axis of rotation, of the retaining element 39 is at least substantially coincident with the output axis A. Figure 9 In the middle, the quick-clamping device is in the released state and transitions to the holding state when the holding element 39 moves. Figure 9 The release state forms the bottom dead center of the retaining element. In the quick-clamping device... Figure 9 Position moved to Figure 8 When in the specified position, the quick-clamping device is in the holding state. Figure 8 During this process, the quick-clamping device is in the transition from the holding state to the clamping state. The quick-clamping device is transitioning from... Figure 8 The position in the middle moves to Figure 7 When in the middle position, the quick clamping device is in the clamping state and reaches the desired position. Figure 7 The clamping state in which the holding element is held at the top dead center.

[0078] The retaining element 39 is rotatably supported about the output axis A in the retained state and / or movably supported along the output axis A in the clamped state. In the retained state, the retaining element 39 is rotatably supported about the output axis A and / or movably supported along the output axis A. In the clamped state, the retaining element 39 is rotatably supported about the output axis A and / or movably supported along the output axis A. In the retained state, the retaining element 39 can be fixedly supported along the output axis A. Figure 10 , Figure 11 (and below). In the clamped state, the retaining element 39 can support the output axis A non-rotatably. Figures 2 to 9 ; Figure 10 Functional separation can be achieved by the following method: when transitioning from a holding state to a clamping state, the holding element 39 changes from a support rotatable about the output axis A to a support movable along the output axis A. Functional separation can also be achieved by the following method: the holding unit 37 is supported, for example, translatably along the output axis A in the clamping state, or translatably along the output axis A and rotatably about the output axis A.

[0079] exist Figure 10 and Figure 11In the following cases, the movement of the retaining element relative to the spindle element along the output axis from the released state to the transition of the retaining unit from the holding state to the clamping state is prevented. Figures 2 to 9 In this process, the movement of the holding element relative to the spindle element around the output axis from the holding state of the holding unit to the clamping state is stopped.

[0080] To secure the accessory assembly, the retaining element is allowed to rotate an angle relative to the spindle element from the released state (bottom dead center) to the clamped state (top dead center) about the output axis. This angle can range from 0° to 40° with a tolerance of +20° to -10°. Figures 2 to 9 ; Figure 10 This angle can include a range from 0° to 48° with a tolerance of + / - 16°. Figure 11 (and below).

[0081] The holding parameters can be changed by altering the degrees of freedom of the holding unit 37, and especially the holding element 39, for example by preventing rotational motion and releasing translational motion.

[0082] The retaining element 39 is configured to engage and clamp the accessory device 17 through it. The retaining element 39 is configured to be inserted through the accessory device 17 in the released state, and to rotate relative to the accessory device 17 in the retained state by means of rotational movement about the output axis A, so as to form-lock the accessory device 17. The retaining element 39 can be inserted through the accessory tool depending on its rotational position. Figure 13 ), and when the rotational position changes, it forms a form-locking engagement with the accessory device 17 in the axial direction along the output axis A. Figure 14 The retaining element 39 has a retaining wing 53 that extends in a radial direction relative to the output axis A and is configured to at least partially surround the accessory device 17. The retaining wing 53 is configured to apply a clamping force to the accessory device 17. The retaining wing 53 has a retaining surface 54 that extends in a radial plane relative to the output axis A.

[0083] The retaining element 39 is configured to transfer the accessory device 17 from a released state to a retained state by means of the rotational movement of the retaining element 39 relative to the spindle element 47 about the output axis A. Figures 2 to 9 ; Figure 10 Neutralized / or clamped state ( Figure 11 (and below)

[0084] The quick-clamping device 23 has a clamping unit 51 with a clamping element 61, the clamping unit being configured 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 configured to transfer the accessory device 17 axially from a holding state to a clamped state via the retaining unit 37. The clamping element 61 is configured to transmit a clamping force axially along the output axis A to the accessory device 17 to clamp it. The clamping element 61 is configured to control the axial movement of the retaining element 39. The clamping element 61 is configured to clamp the accessory device 17 relative to the spindle element 47 in the axial direction along the output axis A by means of the relative movement or rotational movement of the clamping element 61 about the output axis A.

[0085] Clamping element 61 has a configuration as a threaded element ( Figures 2 to 9 ) or constructed as a beveled element ( Figure 10 ; Figure 11 The ramp element 65 (and below) is constructed as a wedge element and is configured to convert the circumferential movement of the retaining element 39 about the output axis A into axial movement of the retaining element 39 along the output axis A. The ramp element 65 may have a varying or constant slope. The ramp element 65 may be constructed to increase monotonically, especially strictly monotonically. The ramp element 65 may form a threaded section.

[0086] The clamping unit 51 has a plurality of ramp elements 65 connected to each other in the circumferential direction. The ramp elements 65 can be arranged in series with each other in the circumferential direction. Figure 10 The ramp elements 65 can be spaced apart from each other in the circumferential direction. Figure 11 (and below). The ramp element 65 is defined by two radial planes that extend radially relative to the output axis A and / or are arranged relatively parallel to each other. Each of the two radial planes defines the first ramp element 65. The spacing between the two radial planes is limited by the maximum axial extension dimension of the ramp element 65. The two radial planes may have a spacing relative to each other that substantially corresponds to the maximum axial movement of the retaining element 39 along the output axis A from the released state to the clamped state.

[0087] The ramp element 65 has a first ramp section 71 and a second ramp section 73 at an angle to the first ramp section 71. The first ramp section 71 extends in a radial plane of the output axis A. The first ramp section 71 is planar in construction. The first ramp section 71 is implemented flat in a circumferential direction about the output axis A. It is conceivable that the first ramp section 71 is at an angle relative to the radial plane of the output axis A. The second ramp section 73 is at an angle relative to the radial plane of the output axis A. The holding parameters of the holding unit 37 can be changed by means of the first ramp section 71 and the second ramp section 73 of the ramp element 65.

[0088] The additional ramp element 67 can be constructed similarly to ramp element 65.

[0089] The clamping unit 51 has an additional ramp element 67 associated with the ramp element 65, configured to interact directly or indirectly with the ramp element 65. The additional ramp element 67 contacts the ramp element 65. The additional ramp element 67 is movably supported relative to the ramp element 65 in a circumferential direction about the output axis A and / or in an axial direction along the output axis A. The additional ramp element 67 is slidably supported relative to the ramp element 65. The ramp element 65 and the additional ramp element 67 can each form a threaded element (…). Figures 2 to 9 ) or inclined element ( Figure 10 ; Figure 11 (and below), they interact with each other. An additional ramp element 67 is arranged on an additional clamping element 63.

[0090] Clamping element 61 can be integrally constructed with retaining element 39. Figures 2 to 9 Clamping element 61 can be configured as a separate clamping ring coupled to retaining element 39. Figure 10 ; Figure 11 (and below). The clamping element 61 is radially limited to retaining element 39 relative to the output axis A. The clamping element 61 and retaining element 39 are integrally constructed. The clamping element 61 is arranged concentrically with retaining element 39 around retaining element 39 at least 360° in at least one plane. The clamping element 61 is constructed as a separate component that is torsionally connected to retaining element 39. Figure 10 ; Figure 11(and below). The clamping element 61 is constructed as a separate component, which is connected to the retaining element 39 by means of a fastening device 75 configured as a fastening screw. The clamping element 61 is constructed in a substantially disc shape. The clamping element 61 is constructed in a substantially annular shape. The clamping element 61 is connected to the retaining element 39 in a torsion-resistant manner, thereby preventing relative movement (rotational movement, translational movement) between the two elements. The clamping element 61 is connected to the retaining element 39 in a torsion-resistant manner. The clamping element 61 is configured to clamp the retaining unit 37 by means of the rotational movement of the clamping element 61 relative to the other clamping elements 61, 63 of the clamping unit 51. The clamping element 61 is arranged on the side of the retaining element 39 opposite to the accessory device 17. The clamping element 61 is fitted onto the retaining element 39.

[0091] The clamping unit 51 has an additional clamping element 63, which is configured to interact directly or indirectly with the clamping element 61. The additional clamping element 63 may be constructed on the spindle element 47 or the preload element 77.

[0092] exist Figures 2 to 9 In this configuration, an additional clamping element 63 is arranged on the spindle element 47 and configured to interact indirectly or via a preload element 77 constructed as a preload sleeve with the clamping element 61, which is integrally constructed with the retaining element 39. The clamping element 61 and the retaining element 39 are integrally constructed. The additional clamping element 63 limits the radial extension dimension of the spindle element 47. The additional clamping element 63 and the retaining element 39 are integrally or in one piece. Here, the preload element 77 has two intermediate clamping elements 81, 83 corresponding to the clamping element 61 and the additional clamping element 63. The intermediate clamping elements 81, 83 are arranged on the preload element 77 and integrally constructed therewith. The first intermediate clamping element 81 is arranged on the inner side of the preload element 77 and is configured as an internal thread. The second intermediate clamping element 83 is arranged on the outer side of the preload element 77 and is configured as an external thread. The first intermediate clamping element 81 is configured to interact with the externally threaded clamping element 61. The second intermediate clamping element 83 is configured to interact with the additional clamping element 63, which has an internal thread, on the spindle element 47. The intermediate clamping elements 81 and 83 are preloaded with respect to the output axis A in the radial direction. The additional clamping element 63 is integrally constructed with the preload element 77.

[0093] exist Figure 10 In this configuration, an additional clamping element 63 is arranged on the preload element 77, which is configured as a preload sleeve, and is configured to interact directly with the clamping element 61, which is configured as a clamping ring. The clamping element 61 is configured as a separate component. The clamping element 61 is configured as a separate clamping ring coupled to the retaining element 39. The clamping element 61 and the additional clamping element 63 are configured as inclined elements (…). Figure 10 , Figure 11(and below). An additional clamping element 63 is positioned above the preload element 77 in the axial direction along the output axis A. The additional clamping element 63 is integrally constructed with the preload element 77. Figure 10 The lower left shows an extension of the preload element 77, which has an additional clamping element 63 that limits the axial extension of the preload element 77. Here, the additional clamping element 63 extends in a ring shape on one end side of the preload element 77 and / or protrudes radially relative to the output axis A. Figure 10 To the lower left, another clamping element 63 is arranged in the internal region of the preload element 77. The other clamping element 63 is limited in the radial direction by a hollow cylindrical wall extending in the axial direction along the output axis A.

[0094] exist Figure 11 In the following configuration, an additional clamping element 63 is arranged on the spindle element 47, which is configured as a spindle sleeve, and is configured to interact directly with the clamping element 61, which is configured as a clamping ring. The additional clamping element 63 limits the spindle element 47 in the axial direction along the output axis A. The additional clamping element 63 is integrally constructed with the spindle element 47. The additional clamping element 63 is coupled to and in direct contact with the clamping element 61.

[0095] Clamping element 61 and the other clamping element 63 each have at least one ramp element 65, 67, which constitutes a threaded element or a bevel element. Of course, only clamping element 61 or only the other clamping element 63 may have ramp elements 65, 67. For example, one of the clamping elements 61, 63 may not have ramp elements 65, 67, but may be constructed as a raised portion configured to interact with the ramp elements 65, 67 corresponding to the raised portion.

[0096] The retaining element 39 has a spindle element 47 configured to interact with the retaining element 39 via a clamping unit 51 and drive the accessory device 17 about the output axis A. The spindle element 47 indirectly contacts the accessory device 17 and has a support element 85 with a support surface 87, which serves as a support for the accessory device 17 in the axial direction along the output axis A. The spindle element 47 is configured as a spindle sleeve and surrounds the retaining element 39 in a plane at 360°. The spindle element 47 is configured to provide torsional support in the circumferential direction about the output axis A, at least in the clamped state, and to drive the accessory device 17 in the operating state. For this purpose, the spindle element 47 has a drive element 89 configured to rotate the accessory device 17 about the output axis A. The drive element 89 is configured to engage through the accessory device 17 and / or form a form lock with the accessory device.

[0097] The quick-clamping device 23 has a preload element 77 configured to control the holding parameters of the holding unit 37. The preload element 77 is configured to cause the holding element 39 to interact with the spindle element 47. The preload element 77 includes additional clamping elements 61 and 63 with additional ramp elements 65 and 67, which are configured as threaded elements or external threads.

[0098] In particular, the translational movement of the retaining element 39 relative to the spindle element along the output axis A from the holding state to the clamping state (top dead center) is greater than the translational movement from the release state to the transition of the retaining element 39 from the holding state to the clamping state. Preferably, the translational movement of the retaining element 39 between the release state and the transition from the holding state to the clamping state is prevented, and the translational movement during the transition from the holding state to the clamping state, or the clamping state, is released. In order to move from the release state to the transition from the holding state to the clamping state, the retaining element 39 can be moved only by rotational movement, so that the accessory device is held on the handheld machine tool 13.

[0099] In particular, the rotational movement of the retaining element 39 relative to the spindle element about the output axis A from the released state to the transition from the retained state to the clamped state is greater than the rotational movement from the retained state to the clamped state to the holding state of the retaining element 39. Preferably, the rotational movement of the retaining element 39 from the retained state to the clamped state is prevented and the rotational movement from the released state to the transition from the retained state to the clamped state is released.

[0100] The preload element 77 surrounds the retaining element 39 in the circumferential direction around the output axis A. The preload element 77 is constructed substantially hollowly cylindrically and forms a preload sleeve. In the retained state, the preload element 77 is movably supported relative to the retaining element 39 and / or the spindle element 47 and is preloaded relative to the retaining element 39 in the axial direction. The preload element 77 is arranged on and coupled to the retaining element 39. The preload element 77 is constructed torsionally against the retaining element 39 and is surrounded by the spindle element 47. The preload element 77 is preloaded relative to the spindle element 47 in the circumferential direction around the output axis A and has a main extension extending along the output axis A. Functional separation can be achieved by means of the preload element 77, which on the one hand transfers the retaining element 39 from a released state to a retained state by rotational movement, and on the other hand transfers it from a retained state to a clamped state by translational movement.

[0101] The retaining unit 37 has a spindle element 47 and a retaining element 39, wherein a preload element 77 is arranged between the spindle element 47 and the retaining element 39. The preload element 77 surrounds the retaining element 39 and is surrounded by the spindle element 47. The preload element 77 is arranged concentrically with respect to the spindle element 47 and the retaining element 39.

[0102] The preload element 77 is coupled to the retaining element 39 and the spindle element 47 and is configured to interact with the spindle element 47 and the retaining element 39. The preload element 77 is configured to clamp the retaining unit 37 relative to the spindle unit in the clamped state in the axial direction along the output axis A.

[0103] The quick-clamping device 23 has a cam drive 91 configured to move the retaining element 39 in a rotational direction about the output axis A. The cam drive 91 is configured to move the retaining element 39 back and forth between two end positions. Figures 7 to 9 The cam drive 91 is configured to at least partially convert the linear motion of the unlocking bolt 29 of the quick clamping device 23 into rotational motion, particularly of the retaining element 39. For this purpose, the cam drive 91 has a guide unit 95 configured to control the rotational motion of the retaining element 39 relative to the spindle element 47. The guide unit 95 is configured to transfer the retaining element 39 from a released state to a clamped state and vice versa. The guide unit 95 has a plurality of guide slots 99 configured to axially guide a clamping pin 97 laterally connected to the unlocking bolt 29 along the output axis A, the unlocking bolt 29 being form-locked to the clamping pin 97. The unlocking bolt 29 is arranged coaxially with the output axis A. The clamping pin 97 is constructed as a clamping bolt and configured to limit the movement of the retaining element 39 relative to the spindle element 47 in the axial direction along the output axis A and / or in the circumferential direction about the output axis A. The guide slots 99 partially have a trajectory curve having a trend angled to the output axis A. The clamping pin 97 is guided in the guide slot 99 such that it controls the movement of the retaining element 39 relative to the spindle element 47. The axial movement of the clamping pin 97 along the guide slot 99 results in a forced movement of the retaining element 39 relative to the spindle element 47. The clamping pin 97 is configured to slide axially along the output axis A, particularly along the guide slot 99, relative to the spindle element 47 and the retaining element 39. Thus, the retaining element 39 can be forced to move relative to the spindle element 47 by means of a cam drive 91. The guide unit 95 has a plurality of guide slots 99, which in particular have a straight, spiral, or other curved orientation. The movement of the retaining element 39 relative to the spindle element 47 can be controlled according to the orientation of the guide slots 99.

[0104] The cam drive mechanism 91 has multiple cam drive elements 93, which are composed of a retaining element 39, a preload element 77, and / or a spindle element 47. Each cam drive element 93 has a guide slot 99. These guide slots 99 are configured to guide the clamping pin 97 and control the rotational movement of the retaining unit 37 about the output axis A. The movement of the cam drive elements 93 can be coupled via the guide slots 99.

[0105] The preload element 77 preferably has a preload guide element 101, especially a preload guide groove. The spindle element 47 preferably has a spindle guide element 102, especially a spindle guide groove. The retaining element 39 particularly preferably has a retaining guide element 103, especially a retaining guide groove. More preferably, each guide slot 99 is coupled to a clamping pin 97. In particular, the guide slot 99 is configured to control the axial movement of the retaining element and / or the preload element 77 relative to the spindle element 47 by means of the clamping pin 97 guided in or on the guide slot. Figure 10 In particular, the guide slots 99 are respectively constructed as elongated holes. These elongated holes may be constructed, at least partially, in a straight line and / or in a curved manner. At least one guide slot 99 may have an extension along the output axis A, which is configured to restrict the axial movement of the retaining element 39. In particular, the clamping pin 97 is configured to be guided along the guide slot 99 so as to enable movement of the retaining element 39 relative to the preload element 77 and the spindle element 47, so as to move the quick clamping device 23 from a clamped state to a released state, and vice versa.

[0106] In particular, the interaction between the guide unit 95 and the clamping unit 51 causes the holding element 39 to be controlled from the released state to the clamped state or from the released state to the holding state or the clamped state, and vice versa.

[0107] exist Figures 2 to 9 In this configuration, a clamping pin is inserted through the preload guide element 101, the spindle guide element 102, and the retaining guide element 103, and guided axially along these guide elements to enable forced movement of the retaining element relative to the spindle element. Furthermore, the axial movement of the retaining element relative to the spindle element is restricted by clamping element 61 and additional clamping element 63. These two clamping elements 61 and 63 form two threads with two intermediate clamping elements 81 and 83. The guide elements 99, 101, 102, and 103 are constructed in a curved, particularly at least partially straight and / or curved manner, such that the threads are prevented during the transition from the released state to the retaining state, and the two threads are released during the transition from the retaining state to the clamping state.

[0108] The quick-clamping device 23 has a spring element 105 configured to preload the retaining element 39 relative to the preload element 77 and / or the spindle element 47 in the released state. The spring element 105 is constructed as a tension / compression spring. The spring element 105 is supported within a cavity of the retaining element 39. The spring element 105 is configured to preload the clamping pin 97 or the unlocking bolt 29. The spring element 105 is preloaded more strongly in the released state than in the clamped state.

[0109] The quick-clamping device 23 may have another spring element 107, which is configured to preload the preload element 77 relative to the spindle element 47 in the circumferential direction about the output axis A. Figure 10 Another spring element 107 is constructed as a torsion spring. This torsion spring surrounds the retaining element 39 360° in a plane. The other spring element 107 may be axially connected to the preload element 77. The other spring element 107 is configured to tension the preload element 77 relative to the spindle element 47 in the clamped state. Here, the other spring element 107 is more tensioned in the clamped state than in the released state. The torsion spring is preloaded or relaxed according to the rotational movement of the retaining element 39 relative to the spindle element 47. The torsion spring has two legs. The first leg is form-locked to the preload element 77 and arranged in an axially extending shaped slot 109 of the preload element 77. The second leg is form-locked directly or indirectly to the spindle element 47, especially in a torsion-resistant manner, and arranged in another axially extending shaped slot.

Claims

1. A quick clamping device for arranging an accessory device (17) on a handheld machine tool (13), comprising: Output unit (33) for moving the accessory device (17) about the output axis (A) of the output unit (33), and A retaining unit (37) having a retaining element (39) for retaining the accessory device (17) on the handheld machine tool (13). in, The quick clamping device has a holding state and a clamping state. In the holding state, the holding unit (37) is configured to hold the accessory device (17) on the output unit (33) and the holding element (39) is rotatably movable relative to the output axis (A). In the clamping state, the holding unit (37) is configured to fix the accessory device (17) on the output unit (33) and the holding element (39) is translatably movable relative to the output axis (A), wherein: i) In the holding state, the rotational movement of the holding element (39) relative to the output unit (33) about the output axis (A) is stronger than the rotational movement of the holding element (39) relative to the output unit (33) about the output axis (A) in the clamping state; ii) In the clamped state, the translational movement of the retaining element (39) relative to the output unit (33) along the output axis (A) is stronger than the translational movement of the retaining element (39) relative to the output unit (33) along the output axis (A) in the holding state.

2. The quick clamping device according to claim 1, characterized in that, The holding unit (37) is rotatably supported about the output axis (A) in the holding state and / or movably supported along the output axis (A) in the clamping state.

3. The quick clamping device according to claim 1 or 2, characterized in that, In the holding state of the holding unit (37), the movement of the holding element (39) along the output axis (A) is prevented.

4. The quick clamping device according to claim 1 or 2, characterized in that, When the retaining unit (37) is clamped, the movement of the retaining element (39) around the output axis (A) is prevented.

5. The quick clamping device according to claim 1 or 2, characterized in that, The retaining unit (37) has a retaining element (39) configured to engage and clamp the accessory device (17) through it.

6. The quick clamping device according to claim 1 or 2, characterized in that... A clamping unit (51) is provided, which is configured to move the holding unit (37) along the output axis (A).

7. The quick clamping device according to claim 1 or 2, characterized in that... A clamping element (61) is provided, which is configured to move the retaining element (39) along the output axis (A).

8. The quick clamping device according to claim 6, characterized in that, The clamping unit (51) has a ramp element (65).

9. The quick clamping device according to claim 8, characterized in that, The clamping unit (51) has an additional ramp element (67) configured to interact directly or indirectly with the ramp element (65).

10. The quick clamping device according to any one of claims 1, 2, 8 and 9, characterized in that... A preload element (77) is provided, which is configured to control the holding parameters of the holding unit (37).

11. The quick clamping device according to claim 8 or 9, characterized in that, The ramp element (65) has a first ramp section (71) and a second ramp section (73) at an angle to the first ramp section (71).

12. The quick clamping device according to claim 7, characterized in that, The clamping element (61) is integrally constructed with the retaining element (39), or the clamping element (61) is constructed as a separate clamping ring coupled to the retaining element (39).

13. The quick clamping device according to claim 10, characterized in that... A cam drive (91) is provided, which is configured to move the holding unit (37) in a rotational direction about the output axis (A).

14. The quick clamping device according to claim 13, characterized in that, The cam drive (91) has a guide unit (95) configured to control the movement of the holding unit (37) relative to the spindle element (47).

15. The quick clamping device according to claim 14, characterized in that... A spring element (105, 107) is provided, which is configured to preload the retaining element (39) relative to the preload element (77) and / or the spindle element (47).

16. The quick clamping device according to claim 1, characterized in that, The handheld power tool (13) is an angle grinder.

17. The quick clamping device according to claim 2, characterized in that, The retaining element (39) is rotatably supported about the output axis (A) in the retaining state and / or movably supported along the output axis (A) in the clamping state.

18. The quick clamping device according to claim 8, characterized in that, The ramp element (65) is constructed as a threaded element or a ramp element.

19. The quick clamping device according to claim 9, characterized in that, The additional ramp element (67) is constructed as a threaded element or a ramp element.

20. The quick clamping device according to claim 13, characterized in that, The cam drive (91) is configured to move the holding element (39) in a rotational direction about the output axis (A).

21. The quick clamping device according to claim 14, characterized in that, The guide unit (95) is configured to control the rotational movement of the holding element (39) relative to the spindle element (47).

22. A handheld machine tool having a quick clamping device (23) according to any one of claims 1 to 21.

23. The handheld machine tool according to claim 22, characterized in that, The handheld machine tool mentioned is an angle grinder.

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