Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
  • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
  • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
  • B24B23/022—Spindle-locking devices, e.g. for mounting or removing the tool
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
  • B24B45/00—Means for securing grinding wheels on rotary arbors
  • B24B45/006—Quick mount and release means for disc-like wheels, e.g. on power tools

Definitions

• the invention relates to a quick release device according to the preamble of claim 1.
• DE 102012 007926 Al relates to a power-driven hand tool with a housing with a spindle head, with a tool spindle that can be driven around its longitudinal axis, in particular with a rotationally oscillatory drive, the tool spindle having a tool-side end with a holding section for a tool to be driven, and with a clamping device with a Fastening element, wherein the clamping device has a clamping configuration in which the tool can be fixed to the tool spindle by means of the fastening element, and a release configuration in which the tool is detachable, and wherein the clamping device can be switched between the clamping configuration and the release configuration by means of an adjusting movement in the same direction.
• the invention is based on the object of improving a quick release device with simple structural measures.
• the object is achieved with a quick release device for an arrangement of an accessory device on a handheld power tool, in particular on an angle grinder, with an output unit for moving the accessory device about an output axis A of the output unit and with a, in particular, a holding unit having a holding element for holding the accessory device on the handheld power tool.
• the holding unit can have a holding parameter which changes in a holding state, in particular during a transition from a holding state to a clamping state.
• the holding unit can be adjustable in such a way that a holding parameter of the holding unit is changed in a holding state, in particular during a transition from a holding state to a clamping state.
• an accessory device can be picked up and held on the handheld power tool in a particularly reliable and fast manner.
• accessory devices with different thicknesses of a receiving area can be reliably received and clamped. It can also be ensured that accessory devices of different thicknesses can each be held on the quick-release device with an approximately uniform clamping force.
• the accessory device can be attached to the quick release device and removed again in a particularly second-saving manner, without having to forego a secure mounting of the accessory device.
• the accessory device can be held particularly reliably on the quick release device, so that the accessory device is secured against independent and / or unintentional loosening.
• the accessory device By changing a holding parameter, the accessory device can be moved from a holding state to a clamping state in a particularly simple manner.
• the holding parameter of the holding unit can be provided to the holding unit, for example by means of a rotary movement of a To put the release state in a hold state, in particular to hold the accessory device on the quick release device or the hand tool.
• the holding parameter of the holding unit can be provided to move the holding unit from a holding state to a clamping state, for example by means of a translational movement along the output axis, in particular to clamp the accessory device to the quick release device or the handheld power tool.
• a separation of the functions can thereby be achieved in a particularly advantageous manner in that the holding unit is switched from a release state to a holding state in order to hold the accessory device in a form-fitting manner on the quick-release device or the hand-held power tool and in that the holding unit is switched from a holding state to a clamping state in order to to tension the accessory device in particular along the output axis.
• a holding parameter is to be understood in particular as a degree of freedom of movement which, in the mechanical sense, preferably forms a number of mutually independent movement possibilities.
• the holding parameter can define a movement, in particular a direction of movement, of at least one holding element.
• the holding parameter can define a rotary movement around the output axis.
• the holding parameter can define a translational movement along the output axis.
• the holding parameter can be changed in that, for example, a rotary movement about the output axis is blocked or stopped and / or a translational movement along the output axis is enabled or started.
• the holding unit is preferably provided to control a holding movement, in particular a change in a holding movement, of the holding unit, in particular during a transition from a holding state to a clamping state.
• the holding parameter can change in the event of a transition from a holding state to a clamping state.
• the holding unit can be provided to hold the accessory device in a form-fitting and / or force-fitting manner on the quick-release device or the hand-held power tool.
• the holding unit can have at least two elements which are movably mounted relative to one another at least in one state.
• the two elements can be arranged opposite one another in such a way that the accessory device is held on the quick release device in the axial direction.
• the two elements can be provided to transmit a clamping force to the accessory device by means of a clamping unit.
• the clamping force preferably corresponds to at least one holding force which is provided to hold the accessory device on the holding unit, in particular on the quick release device, in an operating state of the quick release device or the handheld power tool.
• the two elements can be mounted so as to be movable relative to one another in the axial direction along the output axis in order to tension the accessory device in the axial direction.
• the holding unit can have a holding element.
• the holding element can be provided to reach through the accessory device, in particular a recess of the accessory device, and to hold the accessory device in a form-fitting and / or force-fitting manner on the quick-release device or the output unit.
• the holding element can have a holding wing which extends, preferably outward, in the radial direction with respect to the output axis.
• the holding element can be mounted movably in the axial direction along the output axis in order to tension or release the accessory device by means of the movement in the axial direction.
• the holding element can have a holding contour which corresponds approximately to a receiving recess, in particular a receiving contour of a receiving recess, of the accessory device.
• the holding contour can be outlined by contours of the holding wings.
• the holding contour can be configured approximately in accordance with the receiving contour.
• the holding contour can be made smaller than the receiving contour.
• the holding element can be designed such that the holding contour fits through the receiving contour in order to be able to push the holding element through the receiving recess of the accessory device.
• the retaining element can be provided to close by means of the retaining wing through the receiving recess of the accessory device grab and hold the accessory device. In particular, the retaining element can be rotated relative to the receiving recess in such a way that the retaining wing forms a form fit with the accessory device.
• the holding contour can be aligned with respect to the receiving contour in such a way that in a first rotational position the holding contour covers the receiving contour so that the holding element can be pushed through the receiving recess and when rotated about the output axis in a second rotational position, the holding contour overlaps the receiving contour of the receiving recess.
• the output unit is preferably provided to transmit a rotational and / or oscillating movement about the output axis to an accessory device held on the output unit by means of the holding unit.
• the output unit is preferably operatively connected to a drive unit of the handheld power tool in a manner already known to a person skilled in the art, in particular via at least one drive pinion of the drive unit.
• the output unit comprises in particular at least one sleeve and / or at least one hollow shaft, in particular a hollow spindle.
• the rotational and / or oscillating movement of the output unit can preferably be generated as a result of the output unit interacting with the drive unit of the hand-held power tool, which comprises at least one electric motor.
• the holding element is mounted in such a way that it cannot be removed.
• the component, in particular the retaining element is arranged captively on at least one further component, in particular the output unit, and / or preferably in the functional and / or ready-to-function state, in particular in a released state (relaxed state) of the quick release device and in a clamping state (clamped state) of the quick release device, in particular of the output unit, cannot be separated.
• the holding element is preferably arranged on the output unit in a captive manner.
• the captive retaining element arranged on the output unit and / or any further captive component arranged on the output unit, in particular in the open state and / or in the closed state of the quick release device, is captively connected to the output unit.
• the holding element should be able to be pushed through the accessory tool as a function of a rotational position of the holding element and in the case of a Change the rotational position to form a form fit, in particular one in the axial direction along the output axis, with the accessory device.
• a “release state” of the quick release device is to be understood in particular as a status of the quick release device which is provided to release an accessory device arranged on the quick release device for dismantling and / or to release the quick release device for mounting an accessory device on the quick release device.
• the release state can form a bottom dead center of the quick release device.
• a “holding state” of the quick release device is to be understood in particular as a status of the quick release device in which an accessory device is positively held on the output unit of the quick release device or the handheld power tool and is preferably secured against falling out.
• a “clamping state” of the quick release device is to be understood in particular as a state of the quick release device in which the accessory device is to be set into a state fixed on the output unit, preferably by means of a clamping movement, and / or is fixed to the output unit ready for operation.
• the clamping state can form a top dead center of the quick release device, in which the accessory device is in a state clamped to the output unit.
• the accessory device can preferably be fixed to the output unit in a ready-to-function manner and / or it can be impossible to dismantle an accessory device from the output unit, in particular non-destructively.
• the holding state can include the clamping state.
• the clamping state can form a special form of the holding state in that the holding state also includes a function that holds the accessory device.
• the holding element is provided, in particular in the clamping state of the quick release device, to generate a force fit and / or form fit for holding an accessory device, in particular a grinding wheel, on the quick release device.
• a clamping state is to be understood as meaning that the quick-release clamping device generates a clamping movement to generate the force and / or form fit for holding an accessory device.
• the holding element preferably produces an, in particular axial, form fit, preferably by means of pressing at least part of the accessory device against at least part of the output unit.
• the holding element in particular in addition to the axial form fit, generates a form fit in the radial direction and / or in the circumferential direction, the circumferential direction lying in a plane whose surface normal runs parallel to the output axis.
• the accessory device is fixed to the quick release device without tools. “Can be fixed without tools” is to be understood in particular to mean that a process of arranging an accessory device on the quick release device and / or switching between the release state and the clamping state independently of the use of an external tool, such as a wrench, an Allen key or the like, is possible is.
• the holding element is particularly movably supported in the axial direction in a translatory manner along the output axis and / or rotationally around the output axis, in particular in relation to the output unit, with an axis of movement, in particular an axis of rotation, of the holding element preferably coinciding at least substantially with the output axis.
• the output unit engages around the holding element at least partially, in particular along a circumferential direction which lies in a plane whose surface normal runs at least substantially parallel to the output axis.
• the output unit preferably comprises a hollow shaft for at least partially receiving the holding element.
• such a quick-release clamping device can advantageously be made compact, whereby in particular the assembly of small insert tools, for example insert tools with a diameter of 100 mm or less, can be made possible.
• the accessory device can be designed as a grinding wheel and / or a cutting wheel.
• the holding unit in particular the holding element, can be mounted in the holding state so as to be rotatable essentially about the output axis, and / or in a / the clamping state to be mounted so as to be movable essentially along the output axis.
• the holding unit, in particular the holding element has a clamping state in which the holding element is mounted movably essentially along the output axis. In the holding state, the holding unit can be mounted rotatably about the output axis and / or movably along the output axis. In the clamping state, the holding unit can be rotatably mounted about the output axis and / or movably along the output axis.
• the holding unit in the holding state or in the clamping state, can be mounted non-rotatably about the output axis or cannot be mounted so as to be movable along the output axis.
• a separation of the functions can be achieved in that the holding unit is, for example, in a holding state, rotatably movably mounted about the output axis or rotatably movably about the output axis and translationally along the output axis.
• a separation of the functions can also be achieved in that the holding unit, for example in a clamping state, is movably mounted in a translatory manner along the output axis or is movably mounted in a translatory manner along the output axis and rotatable about the output axis.
• the holding parameter can be changed by changing a degree of freedom of the holding unit, in particular the holding element, in that, for example, a rotary movement is blocked and a translational movement is enabled.
• the holding element can be mounted movably about the output shaft from a release state to a transition from the holding state to the clamping state or up to the clamping state.
• the holding element can be mounted movably along the output axis in a clamping state.
• the holding element can be mounted movably along the output shaft from a release state to a transition from the holding state to the clamping state or up to the clamping state. In a holding state, the holding element can be movably mounted about the output shaft.
• the holding element is preferably mounted movably with respect to a spindle element in order to move the quick-release clamping device from a release state into a clamping state.
• the holding unit in particular the holding element, can rotate through an angle around the output axis from a release state (below dead center) to a clamped clamping state (top dead center).
• the angle can encompass a range from 0 ° to 25 °, in particular up to 30 °, preferably up to 40 °, preferably up to 50 °, particularly preferably up to 55 °, more preferably up to 60 °, further preferably up to 65 °.
• the angle can encompass a range from 0 ° to 40 °, preferably with a tolerance of + 20 ° to -10 °.
• the angle can encompass a range from 0 ° to 32 °, preferably with a tolerance of +/- 8 °.
• the angle can encompass a range from 0 ° to 48 °, preferably with a tolerance of +/- 16 °.
• the holding unit can have a holding element which is provided to reach through the accessory device and to tension the accessory device.
• the holding element can extend through the accessory device, in particular in a released state, and, in particular in a holding state, rotate, for example, by means of a rotary movement about the output axis relative to the accessory device in order to hold the accessory device in a form-fitting manner.
• the holding element can preferably have a holding wing which extends in the radial direction with respect to an output shaft.
• the retaining wing can be provided to encompass the accessory device at least in sections of the incline.
• the retaining wing can be provided to exert a clamping force on the accessory device.
• the retaining bracket can have a retaining surface.
• the holding surface can extend along a radial plane of the output shaft. This allows the Accessory device can be connected to the quick release device, in particular the output unit, in a particularly simple and reliable manner.
• the holding unit is provided to move the accessory device from a release state to a holding state or a clamping state by means of a rotary movement of the holding unit, in particular the holding element relative to the spindle element, about the output axis A.
• the quick-release clamping device can have a clamping unit, in particular a clamping element, which is provided to move the holding unit, in particular the holding element, axially along the output axis A.
• the clamping unit can be coupled to the holding unit.
• the clamping unit can be provided to clamp the accessory device in the axial direction by means of the holding unit, in particular to move it from a holding state to a clamping state.
• the clamping unit can be provided to transmit a clamping force, in particular axially along the output axis, to the accessory device.
• the tensioning unit can have a tensioning element which is provided to control an axial movement of the holding unit, in particular the holding element.
• the clamping unit can be provided to clamp the accessory device by means of a movement or a rotary movement, in particular of the clamping element, about the output axis, in the axial direction along the output axis.
• the tensioning unit can have a further tensioning element which is provided to interact directly or indirectly with the tensioning element.
• the tensioning element and the further tensioning element can form a thread or a ramp which is provided to transmit a tensioning force, in particular axially along the output axis, to the accessory device.
• the further tensioning element can be mounted so as to be movable relative to the tensioning element.
• the further tensioning element can be formed on a further element of the tensioning unit.
• a slope element is to be understood in particular as an element which has a slope, in particular in the circumferential direction around the output axis.
• the pitch element can form a thread or a thread section.
• the incline element can be designed in the manner of a wedge element.
• the incline element can be provided to translate a movement, for example, along the incline element or in the circumferential direction around the output axis into a movement transverse, in particular perpendicular, to the incline element or in the axial direction along the output axis.
• the slope element can have a changing or a constant slope.
• the gradient element can be designed to increase monotonically, in particular in a strictly monotonically increasing manner.
• the tensioning unit can have a single pitch element or a plurality of pitch elements.
• the pitch elements can connect to one another in the circumferential direction.
• the pitch elements can be arranged in series with one another in the circumferential direction.
• the slope elements can be arranged parallel to one another.
• the pitch elements can be spaced apart from one another in the circumferential direction.
• the pitch elements can be limited by two radial planes which extend radially to the output axis and / or are arranged parallel to one another.
• the two radial planes can delimit each first incline element.
• a distance between the two radial planes can be limited by a maximum axial extent of the incline element or the incline elements or an incline section of the incline element (s).
• the two radial planes can be at a distance from one another which essentially corresponds to a maximum axial movement of the holding element along the output axis from a release state to a clamping state.
• the incline element can have a first incline section and a second incline section angled to the first incline section.
• the first slope section can be in a radial plane of the output axis extend.
• the first incline section can be flat.
• the first slope section can preferably have no slope in the circumferential direction around the output axis.
• the first slope section can extend, in particular completely, along a radial plane of the output shaft. It is conceivable that the first incline section is angled with respect to a radial plane of the output shaft.
• the second incline section can be angled with respect to a radial plane of the output axis.
• the holding parameter of the holding unit can be changed by means of the incline element, in particular the first incline section and the second incline section of the incline element.
• the tensioning unit can have a further incline element, in particular designed as a threaded element or a ramp element.
• the further incline element can be assigned to the incline element.
• the further incline element can be designed essentially analogously to the incline element.
• the further incline element can be provided to interact directly or indirectly with the incline element.
• the further incline element can be provided to contact the incline element.
• the further incline element can be mounted so as to be movable relative to the incline element in the circumferential direction around the output axis and / or in the axial direction along the output axis.
• the further incline element can be provided to be mounted in a sliding manner with respect to the incline element.
• the pitch element and the further pitch element can form a thread or a ramp.
• the incline element can be arranged on the tensioning element.
• the incline element can be formed in one piece with the tensioning element.
• the further incline element can be arranged on the further tensioning element.
• the further incline element can be designed in one piece with the further tensioning element.
• the tensioning element can be formed in one piece with the holding element.
• the clamping element can be designed as a separate clamping ring coupled to the holding element.
• the clamping element can limit the holding element in the radial direction to the output shaft.
• the tensioning element can be designed to be integrated with the holding element.
• the tensioning element can surround the holding element by 360 ° in at least one plane.
• the tensioning element can be arranged concentrically to the holding element.
• the tensioning element can be arranged on the holding element.
• the tensioning element can be designed as a separate component which can be connected to the holding element, in particular it can be rotated.
• the tensioning element can be designed as a separate component which is connected to the holding element by a fastening means such as a fastening screw.
• the clamping element can be designed in the form of a disk.
• the clamping element can be firmly connected to the holding element, so that a relative movement (rotary movement, translational movement) of the two elements is prevented.
• the tensioning element can be connected to the holding element in a rotationally fixed manner.
• the tensioning element can be provided to tension the holding unit by means of a relative rotational movement of the tensioning element with respect to a further element, such as for example a further tensioning element, of the tensioning unit.
• the clamping element can be arranged on a side of the holding element facing away from the accessory device.
• the clamping element can limit an axial extension of the holding element along the output axis. As a result, the clamping unit can be designed to be particularly compact.
• the quick-release clamping device in particular the holding unit, to have a spindle element which is provided to interact with the holding element, in particular by means of the clamping unit.
• the spindle element can be provided 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, in particular 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 designed as a spindle sleeve.
• the spindle element can around the holding element in one plane Surrounded 360 °.
• the spindle element can be provided to mount the accessory device in a rotationally fixed manner in the circumferential direction around the output axis, at least in a clamping state.
• the spindle element can have the further tensioning element assigned to the tensioning element.
• the further tensioning element can be designed in one piece with the spindle element.
• the further tensioning element can be designed as a threaded element or a ramp element.
• the further clamping element can limit a radial extension of the spindle element.
• the holding unit in particular the spindle element, can have a driving element which is provided to drive the accessory device or to set it in rotation, in particular about the output axis.
• the driving element can be designed as a rotary driving element.
• the entrainment element can be provided to grip through the accessory device and / or to form a form fit with the accessory device.
• the quick release device can have a cam gear which is provided to move the holding unit, in particular the holding element, in the direction of rotation about the output axis.
• the cam gear can be provided to move the holding unit, in particular the holding element, back and forth between two end positions.
• one of the end positions can be a position that can preferably be fixed by a securing unit.
• an advantageous power transmission and / or power conversion can be achieved. Ease of use can advantageously be increased, in particular by converting a simple operator handle, for example a push of a button and / or a lever adjustment, into a more complex movement, for example a rotational movement, of the holding element.
• the cam gear is provided to convert a linear movement, in particular of an unlocking bolt of the quick release device, at least partially into a rotational movement, in particular of the fixing element.
• An “end position” should in particular be understood to mean a position in the open state and / or a position in the closed state. Under a “fixable by the fuse unit Position ”is to be understood in particular as a position in the open state.
• a “cam gear” is preferably provided to convert a linear movement into a movement that is at least partially different from a linear movement, for example a rotational movement or to convert a movement that is at least partially different from a linear movement into a linear movement.
• the cam gear can have a guide unit which is provided to control a movement, in particular a rotary movement, of the holding unit, in particular of the holding element with respect to the spindle element.
• the guide unit has a guide recess which is provided to guide a dowel pin, in particular axially along the output axis.
• the guide recess can have a trajectory that is angled to the output axis.
• the clamping pin can be guided in the guide recess in such a way that the clamping pin controls the clamping unit or the holding unit.
• an advantageous power transmission and / or power conversion can be achieved.
• a movement of a component relative to the output unit can advantageously be forced by means of such a cam mechanism.
• the guide unit can have several guide recesses, which in particular have a straight course, a helical course or some other curved course.
• the cam gear can have several cam gear elements.
• the cam gear elements can each have a guide recess.
• the guide recesses can be provided to guide a dowel pin.
• the guide recesses can be provided to control a rotary movement of the holding unit about the output axis.
• a movement of the cam gear elements can be coupled by means of the guide recesses.
• an interaction of the guide unit and the tensioning unit causes the holding unit, in particular from a release state is controlled to a clamping state, preferably from a holding state to a clamping state.
• the tensioning unit can have a further incline element, in particular designed as a threaded element or a ramp element.
• the further incline element can be formed at a distance from the incline element.
• the further pitch element can be designed as a threaded element.
• the further incline element can be arranged on the prestressing element.
• the further incline element can be formed in one piece with the prestressing element.
• the further incline element can surround the prestressing element, in particular surround it in a plane of 360 °.
• the quick release device can have a prestressing element which is provided to control a / the holding parameter of the holding unit.
• the pretensioning element is provided to interact with the holding unit, in particular the holding element and the spindle element.
• the pretensioning element can have a / the further tensioning element.
• the pretensioning element can have a / the further incline element, which is designed in particular as a threaded element or a ramp element.
• a particularly reliable and quick securing of the accessory device to the holding unit can be ensured by means of the clamping element.
• the holding parameter can be controlled particularly reliably by means of the cam gear and the tensioning unit.
• a combination with the cam gear and the tensioning unit leads to an adapted adjustability of the holding unit.
• a translational movement of the holding unit, in particular the holding element, along the output axis from a transition from the holding state to the clamping state to the clamped state is greater than from the release state to the transition from the holding state to the clamping state of the holding unit .
• a Translational movement of the holding unit between the release state and the clamping state can be locked and released in the clamping state.
• a movement is to be understood in particular as a movement of the holding unit, in particular of the holding element with respect to the spindle element.
• the holding element can only be moved by means of a rotary movement in such a way that the accessory tool is held on the handheld power tool. In this way, particularly reliable holding and tensioning of the accessory device can be achieved.
• a rotational movement of the holding element about the output axis from the release state to a transition from the holding state to the clamping state is greater than a rotational movement from the transition from the holding state to the clamping state up to a clamped state of the holding unit.
• a rotational movement of the holding element can preferably be blocked in the clamping state and released from the release state to the transition from the holding state to the clamping state.
• the prestressing element can surround the holding element, in particular to surround it in the circumferential direction around the output shaft. It can furthermore be expedient for the prestressing element to be designed essentially as a hollow cylinder.
• the prestressing element can form a prestressing sleeve.
• the prestressing element can, in particular in a holding state, be movably mounted with respect to the holding element and / or the spindle element.
• the prestressing element can be prestressed in the axial direction with respect to the holding element.
• the prestressing element can be arranged on the holding element.
• the prestressing element can be designed to be non-rotatable with respect to the holding element.
• the pretensioning element can be surrounded by the spindle element.
• the pretensioning element can be pretensioned with respect to the spindle element in the circumferential direction about the output axis.
• the pretensioning element can have a main extension which extends along the output axis.
• a holding parameter of the holding unit can be controlled in a particularly advantageous manner by means of the pretensioning element.
• a separation of the functions can be achieved in that the biasing element moves the holding element, in particular by means of a rotary movement, from a release state to a holding state on the one hand and, in particular by means of a translational movement, from a holding state to a clamping state on the other hand.
• the holding unit can have a spindle element and a holding element, the pretensioning element being arranged between the spindle element and the holding element.
• the prestressing element can enclose the holding element.
• the pretensioning element can be enveloped by the spindle element.
• the prestressing element can be arranged concentrically to the spindle element and / or the holding element. In this way, a particularly compact quick release device can be formed.
• the prestressing element can be coupled to the holding element and the spindle element.
• the prestressing element can be provided to interact with the spindle element and the holding element.
• the prestressing element can be provided to clamp the holding unit with respect to the spindle unit in a clamping state in the axial direction along the output axis.
• the quick-release clamping device can have a clamping element which is provided to move the holding unit, in particular the holding element, axially along the output axis A.
• the tensioning element can have a threaded element or a ramp element.
• the prestressing element can have a clamping element that corresponds to the clamping element.
• the corresponding tensioning element can be designed in one piece with the pretensioning element.
• the corresponding tensioning element can be designed as a threaded element, in particular an internal thread, and / or as a ramp element.
• the corresponding clamping element can limit the prestressing element in the radial direction with respect to the output axis and / or in the axial direction along the output axis.
• the prestressing element can have a further clamping element which is formed in one piece with the prestressing element.
• the further clamping element can be a threaded element, in particular have an external thread or a ramp element.
• the further clamping element can be coupled to the spindle element.
• the spindle element can have a further clamping element corresponding to the further clamping element.
• the corresponding further tensioning element can be designed in one piece with the spindle element.
• the corresponding further tensioning element can be designed as a threaded element, in particular an internal thread.
• the corresponding further clamping element can limit the spindle element in the radial direction with respect to the output axis and / or in the axial direction along the output axis. This enables a particularly simple coupling of the holding element and the spindle element.
• the quick-release clamping device has a spring element which is provided to preload the clamping unit, in particular the holding element, with respect to the preloading element and / or the spindle element.
• the spring element can be designed as a tension / compression spring.
• the spring element can be designed as a torsion spring.
• the spring element surrounds the holding element in one plane by 360 °.
• the spring element can be provided to put the handheld power tool in a tensioned state. In this way, a reset can be achieved in a particularly simple manner. This enables a constant pretensioning force to be achieved.
• the quick release device can have a spring element which is provided to preload the holding element in a released state with respect to the preload element and / or the spindle element.
• the spring element can be designed as a tension / compression spring.
• the spring element can be mounted in a cavity of the holding element.
• the spring element can be provided to preload the dowel pin or the unlocking bolt.
• the spring element can be pretensioned more strongly in a released state than in a tensioned state.
• the quick release device can have a further spring element which is provided to prestress the prestressing element in the circumferential direction about the output axis with respect to the spindle element.
• the other The spring element can be designed as a torsion spring.
• the torsion spring can surround the holding element in one plane through 360 °.
• the further spring element can be provided to clamp the prestressing element in a clamping state with respect to the spindle element.
• the further spring element can be more strongly tensioned in a tensioned state than in a release state.
• the torsion spring can be pretensioned or relaxed as a function of a rotational movement of the holding element relative to the spindle element.
• the prestressing element can be prestressed in a clamping state by means of a spring element, in particular a torsion spring, in the axial direction along the output unit or in the circumferential direction about the output axis. It can furthermore be expedient for the preloading element to be preloaded in the circumferential direction about the output axis by means of a spring element, in particular a torsion spring, in the released state and / or in a holding state and / or in a clamping state.
• a spring element in particular a torsion spring
• the invention also relates to a handheld power tool, in particular an angle grinder, with a quick-release clamping device for operating an accessory device.
• FIG. 1 shows a perspective view of a hand machine tool with a quick release device according to the invention
• FIG. 2 each show a section through the handheld power tool
• FIG. 4 shows two states of the quick release device
• FIG. 5 shows a section through the quick release device
• FIG. 6 is an exploded view of the quick release device from FIG. 5,
• the hand machine tool 13 is designed as an angle grinder.
• the accessory device 17 is designed as a grinding wheel and / or as a cutting wheel.
• the accessory device 17 has a connection device 19 (cf. FIG. 4).
• the connection device 19 is designed as a continuous receiving recess 21.
• the handheld power tool 13 has a quick-release clamping device 23, which is provided to arrange the accessory device 17 on the handheld power tool 13.
• the handheld power tool 13 has an actuating means 25 for opening and closing the quick-release clamping device 23.
• the actuating means 25 is designed as a pull lever 54.
• the pull lever 54 has an eccentric 27.
• the actuating means 25 is provided, in particular by means of the eccentric 27, to move an unlocking bolt 29 (cf. FIGS. 2, 3) of the quick release device 23 in the axial direction.
• the unlocking bolt 29 is provided to unlock the quick release device 23 when the unlocking bolt 29 moves into the housing 15 of the machine tool 12. When the quick release device 23 is locked, the unlocking bolt 29 moves out of the housing 15 of the machine tool 12.
• the machine tool 12 has a drive unit 31 which is provided to provide kinetic energy in order to move the accessory device 17, in particular to rotate it.
• the drive unit 31 is arranged in the housing 15.
• the drive unit 31 is designed as an electric motor and in particular designed as an EC motor.
• the quick release device 23 has an output unit 33 for moving the accessory device 17 about an output axis A of the output unit 33.
• the drive unit 31 drives the output unit 33 in order to move the accessory device 17 about an output axis A.
• the output unit 33 is provided to transmit a rotational and / or oscillating movement about the output axis A to an accessory device 17 held on the output unit 33 by means of the holding unit 37.
• the output unit 33 is operatively connected to the drive unit 31 via a drive pinion.
• the output unit 33 comprises a spindle element 47 designed as a hollow shaft, in particular a hollow spindle.
• the quick release device 23 also has a holding unit 37, which has a holding element 39, for holding the accessory device 17 on the handheld power tool 13.
• the holding unit 37 is adjustable in such a way that a holding parameter of the holding unit 37 is changed in a holding state, in particular in the event of a transition from a holding state to a clamping state.
• the accessory device 17 can be moved from a holding state to a clamping state in a particularly simple manner.
• the holding parameter of the holding unit 37 is set in such a way that the holding unit 37 is moved from a release state to a holding state by means of a rotary movement (FIG. 10; FIG. 11 ff.) Or by means of a rotary and a translational movement (FIGS. 2 to 9) to hold the accessory device 17 on the quick release device 23.
• the holding unit 37 or the holding element 39 is rotatably mounted or positively guided in a holding state (FIG. 10; FIG. 11 ff.) Or rotatory and translational (FIGS. 2 to 9).
• the holding parameter of the holding unit 37 can be set or changed in such a way that the holding unit 37 is moved from a holding state to a clamping state by means of a translational movement in order to clamp the accessory device 17 to the quick-release clamping device 23.
• the holding unit 37 or the holding element 39 is in a tensioned state translationally (Fig. 2 to 9; Fig. 10) or rotatory and translationally (Fig. 11 ff.) movably mounted or positively guided.
• a separation of the functions can particularly advantageously be achieved in that a holding parameter of the holding unit 37 is changed in a holding state, a direction of movement of the holding element 39 of the holding unit 37 can be changed, in particular blocked or released.
• a rotational relative movement about the output axis A and a translational relative movement along the output axis A of the holding element can be changed into a translational relative movement along the output axis A (FIGS. 2 to 9).
• a rotational relative movement about the output axis A of the holding element 39 can be changed into a translational relative movement along the output axis A (FIG. 10).
• a relative rotational movement about the output axis A of the holding element 39 can be changed into a relative rotational movement about the output axis A and a relative translational movement along the output axis A (Fig. 11 ff.).
• a holding parameter should be understood to mean a degree of freedom of movement of the holding element 39.
• the holding element 39 is provided to hold the accessory device 17 in a form-fitting manner on the quick release device 23.
• the holding unit 37 has a spindle element 47.
• the holding element 39 is movably supported with respect to the spindle element 47 in one state.
• the holding element 39 and the spindle element 47 are arranged opposite one another in such a way that the accessory device 17 is held on the quick release device 23 in the axial direction along the output axis A.
• the holding element 39 and the spindle element 47 are provided to transmit a clamping force to the accessory device 17 by means of a clamping unit 51.
• the clamping force preferably corresponds to at least one holding force, which is provided to the accessory device 17 in an operating state of the quick release device 23 or the To hold the hand tool 13 on the quick release device 23.
• the holding element 39 and the spindle element 47 are mounted movably opposite one another in the axial direction along the output axis A in order to tension the accessory device 17 in the axial direction.
• the spindle element 47 engages around the holding element 39 along a circumferential direction which lies in a plane whose surface normal runs at least essentially parallel to the output axis A.
• the spindle element 47 is designed as a hollow shaft in order to at least partially accommodate the holding element 39.
• the holding element 39 is provided to reach through a receiving recess 21 of the accessory device 17 and to hold the accessory device 17 in a form-fitting manner on the quick release device 23.
• the holding element 39 has several, in particular four, holding wings 53, which extend outward in the radial direction with respect to the output axis A.
• the holding element 39 has a holding contour 55 which corresponds approximately to a receiving contour 57 of a receiving recess 21 of the accessory device 17.
• the holding contour 55 is outlined by the contours of the holding wings 53.
• the holding contour 55 is designed approximately in accordance with the receiving contour 57 and is smaller than the receiving contour 57 in order to enable the holding wings 53 to reach through the receiving recess 21.
• the holding element 39 is designed in such a way that the holding contour 55 fits through the receiving contour 57 in order to be able to push the holding element 39 through the receiving recess 21 of the accessory device 17.
• the holding element 39 is provided to grip through the receiving recess 21 of the accessory device 17 by means of the holding wings 53 and to hold the accessory device 17.
• the holding element 39 can be rotated with respect to the receiving recess 21 in such a way that the holding wings 53 form a form fit with the accessory device 17.
• the holding contour 55 can be aligned with respect to the receiving contour 57 in such a way that in a first rotational position (FIG.
• the holding contour 55 covers the receiving contour 57 so that the holding element 39 can be pushed through the receiving recess 21 and, when rotated about the output axis A, into a second Rotational position (FIG. 14) the holding contour 55 overlaps the receiving contour 57 of the receiving recess 21.
• the holding element 39 is dependent A rotational position of the holding element 39 can be pushed through the accessory tool and, when the rotational position changes, forms a positive fit, in particular in the axial direction along the output axis A, with the accessory device 17.
• the holding element 39 is connected to the quick release device 23, in particular in a non-removable manner.
• the holding element 39 is movably supported in the axial direction in a translatory manner along the output axis A and / or rotationally about the output axis A in relation to the spindle element 47, with an axis of movement, in particular an axis of rotation, of the holding element 39 at least substantially coinciding with the output axis A.
• the quick release device is in a release state and changes to a holding state when the holding element 39 is moved.
• FIG. 9 forms a bottom dead center of the holding element.
• the quick release device When the quick release device is moved from a position in FIG. 9 to a position in FIG. 8, the quick release device is in a holding state. In FIG. 8, the quick release device is in a transition from a holding state to a clamping state.
• the quick release device moves from a position in FIG. 8 to a position in FIG. 7, the quick release device is in a clamping state and in FIG. 7 reaches a clamped state in which the holding element reaches a top dead center.
• the holding element 39 In the holding state, the holding element 39 is mounted such that it can rotate essentially about the output axis A and / or in a / the clamping state is mounted such that it can be moved essentially along the output axis A. In the holding state, the holding element 39 is rotatably mounted about the output axis A and / or movably along the output axis A. In the tensioned state, the holding element 39 is rotatably mounted about the output axis A and / or movably along the output axis A. In the holding state, the holding element 39 cannot be mounted so as to be movable along the output axis A (FIG. 10; FIG. 11 ff.).
• a separation of the functions can be achieved in that the holding element 39 in a The transition from the holding state to the clamping state is switched from a bearing that is rotatable about the output axis A to a bearing that is movable along the output axis A.
• a separation of the functions can also be achieved in that the holding unit 37 is, for example in a clamping state, movably mounted in a translatory manner along the output axis A or movably mounted in a translatory manner along the output axis A and rotatable about the output axis A.
• FIGS. 10 and 11 et seq. A movement of the holding element relative to the spindle element along the output axis from the release state to a transition from the holding state to the clamping state of the holding unit is blocked.
• FIGS. 2 to 9 a movement of the holding element relative to the spindle element about the output axis from a transition from the holding state to the clamping state up to a clamped state of the holding unit is blocked.
• the holding element can be rotated by an angle about the output axis with respect to the spindle element from a release state (below dead center) to a clamped clamping state (top dead center).
• the angle can encompass a range from 0 ° to 40 ° with a tolerance of + 20 to -10 ° (FIGS. 2 to 9; FIG. 10).
• the angle can encompass a range from 0 ° to 48 ° with a tolerance of +/- 16 ° (FIG. 11 ff.).
• the holding parameter can be changed by changing a degree of freedom of the holding unit 37, in particular of the holding element 39, in that, for example, a rotational movement is blocked and a translational movement is released.
• the holding element 39 is provided to reach through the accessory device 17 and to tension the accessory device 17.
• the holding element 39 is provided to extend through the accessory device 17 in a released state and to rotate it in a holding state by means of a rotary movement about the output axis A relative to the accessory device 17 in order to hold the accessory device 17 in a form-fitting manner.
• the holding element 39 is through depending on a rotational position of the holding element 39 the accessory tool can be pushed through (FIG. 13) and, when the rotational position changes, forms a form fit in the axial direction along the output axis A with the accessory device 17 (FIG. 14).
• the holding element 39 has a holding wing 53 which extends in the radial direction with respect to an output axis A and is provided to grip around the accessory device 17 at least in sections.
• the retaining wing 53 is provided to exert a tensioning force on the accessory device 17.
• the retaining wing 53 has a retaining surface 54 which extends in the radial direction with respect to the output axis A in a radial plane of the output axis A.
• the holding element 39 is provided for the purpose of moving the accessory device 17 from a release state to a holding state by means of a rotary movement of the holding element 39 relative to the spindle element 47 about the output axis A (Fig.
• the quick-release clamping device 23 has a clamping unit 51 which has a clamping element 61 and which is provided to move the holding element 39 axially along the output axis A.
• the tensioning unit 51 is coupled to the holding unit 37.
• the clamping element 61 is provided to move the accessory device 17 by means of the holding unit 37 in the axial direction from a holding state to a clamping state.
• the clamping element 61 is provided to transmit a clamping force axially along the output axis A to the accessory device 17 in order to clamp the accessory device 17.
• the clamping element 61 is provided to control an axial movement of the holding element 39.
• the clamping element 61 is provided to clamp the accessory device 17 by means of a relative movement or a rotary movement of the clamping element 61 about the output axis A with respect to the spindle element 47 in the axial direction along the output axis A.
• the tensioning element 61 has an incline element 65 designed as a threaded element (FIGS. 2 to 9) or a ramp element (FIG. 10; FIGS. 11 ff.).
• the incline element 65 is designed in the manner of a wedge element, which is provided for a movement of the holding element 39 in the circumferential direction about the output axis A into a movement of the holding element 39 in the axial direction To translate direction along the output axis A.
• the slope element 65 can have a changing or a constant slope.
• the incline element 65 can be designed to increase monotonically, in particular in a strictly monotonically increasing manner.
• the pitch element 65 can form a threaded section.
• the tensioning unit 51 has a plurality of incline elements 65 which adjoin one another in the circumferential direction.
• the incline elements 65 can be arranged in series with one another in the circumferential direction (FIG. 10).
• the incline elements 65 can be spaced apart from one another in the circumferential direction (FIG. 11 ff.).
• the incline elements 65 are delimited by two radial planes which extend radially to the output axis A and / or are arranged parallel to one another.
• the two radial planes delimit each first incline element 65.
• a distance between the two radial planes is limited by a maximum axial extent of the incline elements 65.
• the two radial planes can be at a distance from one another which essentially corresponds to a maximum axial movement of the holding element 39 along the output axis A from a release state to a clamping state.
• the incline element 65 has a first incline section 71 and a second incline section 73 angled to the first incline section 71.
• the first incline section 71 extends in a radial plane of the output axis A.
• the first incline section 71 is flat.
• the first incline section 71 is designed to be flat in the circumferential direction around the output axis A and has no incline. It is conceivable that the first incline section 71 is angled with respect to a radial plane of the output axis A.
• the second incline section 73 is angled with respect to a radial plane of the output axis A.
• the holding parameter of the holding unit 37 can be changed by means of the first incline section 71 and the second incline section 73 of the incline element 65.
• the further incline element 67 can be designed analogously to the incline element 65.
• the tensioning unit 51 has a further incline element 67 which is assigned to the incline element 65 and which is provided to interact directly or indirectly with the incline element 65.
• the further incline element 67 contacts the incline element 65.
• the further incline element 67 is mounted so as to be movable relative to the incline element 65 in the circumferential direction about the output axis A and / or in the axial direction along the output axis A.
• the further incline element 67 is slidably mounted with respect to the incline element 65.
• the incline element 65 and the further incline element 67 can each form a threaded element (FIGS. 2 to 9) or a ramp element (FIG. 10; FIG. 11 ff.), Which interact with one another.
• the further incline element 67 is arranged on a further tensioning element 63.
• the clamping element 61 can be formed in one piece with the holding element 39 (FIGS. 2 to 9).
• the clamping element 61 can be designed as a separate clamping ring coupled to the holding element 39 (FIG. 10; FIG. 11 ff.).
• the clamping element 61 limits the holding element 39 in the radial direction to the output axis A.
• the clamping element 61 is designed to be integrated with the holding element 39.
• the tensioning element 61 surrounds the holding element 39 in at least one plane by 360 ° and is arranged concentrically to the holding element 39.
• the tensioning element 61 is designed as a separate component which can be connected in a rotationally fixed manner to the holding element 39 (FIG. 10; FIG. 11 ff.).
• the tensioning element 61 is designed as a separate component which is connected to the holding element 39 by a fastening means 75 designed as a fastening screw.
• the tensioning element 61 is designed essentially in the shape of a disk.
• the tensioning element 61 is designed to be essentially ring-shaped.
• the clamping element 61 is firmly connected to the holding element 39 in such a way that a relative movement (rotary movement, translational movement) of the two elements is prevented.
• the tensioning element 61 is connected to the holding element 39 in a rotationally fixed manner.
• the tensioning element 61 is provided to tension the holding unit 37 by means of a rotary movement of the tensioning element 61 with respect to a further tensioning element 61, 63 of the tensioning unit 51.
• the tensioning element 61 is arranged on a side of the holding element 39 facing away from the accessory device 17.
• the tensioning element 61 is placed on the holding element 39.
• the tensioning unit 51 has a further tensioning element 63 which is provided to interact directly or indirectly with the tensioning element 61.
• the further tensioning element 63 can be formed on the spindle element 47 or on a pretensioning element 77.
• the further tensioning element 63 is arranged on the spindle element 47 and is provided to interact with the tensioning element 61 formed in one piece with the holding element 39 indirectly or by means of a tensioning element 77 embodied as a tensioning sleeve.
• the tensioning element 61 is designed to be integrated with the holding element 39.
• the further clamping element 63 delimits a radial extension of the spindle element 47.
• the further tensioning element 63 is formed in one piece or in one piece with the holding element 39.
• the pretensioning element 77 has two intermediate tensioning elements 81, 83 corresponding to the tensioning element 61 and the further tensioning element 63.
• the intermediate clamping elements 81, 83 are arranged on the prestressing element 77 and formed in one piece therewith.
• a first intermediate clamping element 81 is arranged on an inner side of the prestressing element 77 and is designed as an internal thread.
• a second intermediate clamping element 83 is arranged on an outer side of the prestressing element 77 and is designed as an external thread.
• the first intermediate tensioning element 81 is provided to interact with the tensioning element 61 designed as an external thread.
• the second intermediate clamping element 83 is provided to interact with the further clamping element 63 of the spindle element 47, which is designed as an internal thread.
• the intermediate clamping elements 81, 83 limit the prestressing element 77 in the radial direction with respect to the output axis A.
• the further clamping element 63 is formed in one piece with that with the prestressing element 77.
• the further clamping element 63 is arranged on a prestressing element 77 designed as a prestressing sleeve and is provided to interact directly with the clamping element 61 designed as a clamping ring.
• the tensioning element 61 is designed as a separate component.
• the clamping element 61 is designed as a separate clamping ring coupled to the holding element 39.
• the clamping element 61 and the other Clamping elements 63 are designed as ramp elements (Fig. 10, Fig. 11 ff.).
• the further clamping element 63 delimits the prestressing element 77 in the axial direction along the output axis A.
• the further clamping element 63 is formed in one piece with that with the prestressing element 77.
• FIG. 10 bottom left, a further development of the prestressing element 77 is shown, which has a further clamping element 63 which limits an axial extension of the prestressing element 77.
• the further tensioning element 63 extends in the form of a ring on an end face of the pretensioning element 77 and / or protrudes radially with respect to the output axis A.
• the further clamping element 63 is arranged in an inner region of the prestressing element 77.
• the further clamping element 63 is delimited in the radial direction by a hollow cylindrical wall extending in the axial direction along the output axis A.
• the further clamping element 63 is arranged on the spindle element 47 designed as a spindle sleeve and provided to interact directly with the clamping element 61 designed as a clamping ring.
• the further clamping element 63 delimits the spindle element 47 in the axial direction along the output axis A.
• the further clamping element 63 is formed in one piece with that with the spindle element 47.
• the further clamping element 63 is coupled to the clamping element 61 and makes direct contact with it.
• the tensioning element 61 and the further tensioning element 63 each have at least one incline element 65, 67 which forms the threaded element or the ramp element. It goes without saying that only the tensioning element 61 or the further tensioning element 63 can also have an incline element 65, 67.
• one of the tensioning elements 61, 63 may not have an incline element 65, 67, but rather be designed, for example, as a type of elevation which is provided to interact on the incline element 65, 67 corresponding to the elevation.
• the holding element 39 has a spindle element 47 which is provided to interact with the holding element 39 by means of the clamping unit 51 and to drive the accessory device 17 about the output axis A.
• the Spindle element 47 makes indirect contact with accessory device 17 in that spindle element 47 has a support element 85 which has a support surface 87 and which serves as a support for accessory device 17 in the axial direction along output axis A.
• the spindle element 47 is designed as a spindle sleeve and surrounds the holding element 39 in one plane by 360 °.
• the spindle element 47 is provided to mount the accessory device 17 in a rotationally fixed manner around the output axis A, at least in a clamping state, and to drive it in an operating state.
• the spindle element 47 has a driver element 89 which is provided to set the accessory device 17 in rotation about the output axis A.
• the driving element 89 is designed as a rotary driving element.
• the driver element 89 is provided to grip through the accessory device 17 and / or to form a form fit with the accessory device 17.
• the quick release device 23 has a prestressing element 77 which is provided to control a / the holding parameter of the holding unit 37.
• the prestressing element 77 is provided to interact with the holding element 39 and the spindle element 47.
• the prestressing element 77 has the further clamping element 61, 63 with a further pitch element 65, 67, which is designed as a threaded element or an external thread.
• a translational movement of the holding element 39 relative to the spindle element along the output axis A from a transition from the holding state to the clamping state to the clamped state (top dead center) is greater than from the release state to the transition from the holding state to the clamping state of the holding element 39
• a translational movement of the holding element 39 between the release state and the transition from the holding state to the clamping state is preferably blocked and released from the transition from the holding state to the clamping state or the clamped state.
• the holding element 39 can only be moved by means of a rotary movement in such a way that the accessory device is held on the handheld power tool 13.
• a rotary movement of the holding element 39 relative to the spindle element about the output axis A from the release state to a transition from the holding state to the clamping state is greater than a rotary movement from the transition from the holding state to the clamping state to a clamped state of the holding element 39.
• a rotational movement of the holding element 39 from the transition from the holding state to the clamping state is blocked and released from the release state to the transition from the holding state to the clamping state.
• the prestressing element 77 surrounds the holding element 39 in the circumferential direction around the output axis A.
• the prestressing element 77 is designed essentially as a hollow cylinder and forms a prestressing sleeve. In a holding state, the pretensioning element 77 is movably supported relative to the holding element 39 and / or the spindle element 47 and pretensioned relative to the holding element 39 in the axial direction.
• the prestressing element 77 is arranged on the holding element 39 and coupled to it.
• the prestressing element 77 is designed to be non-rotatable relative to the holding element 39 and is surrounded by the spindle element 47.
• the prestressing element 77 is prestressed relative to the spindle element 47 in the circumferential direction about the output axis A and has a main extension which extends along the output axis A.
• a separation of the functions can be achieved by means of the prestressing element 77 in that the prestressing element 77 shifts the holding element 39 by means of a rotary movement from a release state to a holding state on the one hand and by means of a translational movement from a holding state to a clamping state on the other hand.
• the holding unit 37 has a spindle element 47 and a holding element 39, the prestressing element 77 being arranged between the spindle element 47 and the holding element 39.
• the prestressing element 77 envelops the holding element 39 and is enveloped by the spindle element 47.
• the prestressing element 77 is arranged concentrically to the spindle element 47 and the holding element 39.
• the prestressing element 77 is coupled to the holding element 39 and the spindle element 47 and is provided to interact with the spindle element 47 and the holding element 39.
• the prestressing element 77 is provided to clamp the holding unit 37 with respect to the spindle unit in a clamping state in the axial direction along the output axis A.
• the quick release device 23 has a cam gear 91 which is provided to move the holding element 39 in the direction of rotation about the output axis A.
• the cam gear 91 is provided to move the holding element 39 back and forth between two end positions (FIGS. 7 to 9).
• the cam gear 91 is provided to convert a linear movement of the unlocking bolt 29 of the quick release device 23 at least partially into a rotational movement, in particular of the holding element 39.
• the cam gear 91 has a guide unit 95 which is provided to control a rotary movement of the holding element 39 with respect to the spindle element 47.
• the guide unit 95 is provided to move the holding element 39 from a release state into a clamping state and vice versa.
• the guide unit 95 has several guide recesses 99, which are provided to guide a clamping pin 97, which is transversely connected to the unlocking bolt 29, axially along the output axis A.
• the unlocking bolt 29 is positively connected to the dowel pin 97.
• the unlocking bolt 29 is arranged coaxially to the output axis A.
• the clamping pin 97 is designed as a clamping bolt and is provided to limit a movement of the holding element 39 in the axial direction along the output axis A and / or in the circumferential direction around the output axis A with respect to the spindle element 47.
• the guide recesses 99 partially have a trajectory that is angled to the output axis A.
• the clamping pin 97 is guided in the guide recess 99 in such a way that the clamping pin 97 controls the holding element 39 with respect to the spindle element 47.
• a movement of the dowel pin 97 in the axial direction along the guide recesses 99 leads to a forced movement of the holding element 39 relative to the spindle element 47.
• the dowel pin 97 is intended to move in the axial direction along the output axis A, in particular along the guide recess (s) 99, relative to the spindle element 47 and the Retaining element 39 to slide.
• a movement of the holding element 39 relative to the spindle element 47 can be forced by means of the cam gear 91.
• the guide unit 95 has a plurality of guide recesses 99, which in particular have a straight course, a helical course or some other curved course.
• a movement of the holding element 39 with respect to the spindle element 47 can be controlled as a function of the orientations of the guide recesses 99.
• the cam gear 91 has a plurality of cam gear elements 93 which are formed by the holding element 39, the pretensioning element 77 and / or the spindle element 47.
• the cam gear elements 93 each have a guide recess 99.
• the guide recesses 99 are provided to guide a dowel pin 97 and to control a rotary movement of the holding unit 37 about the output axis A.
• a movement of the cam gear element 93 can be coupled by means of the guide recesses 99.
• the prestressing element 77 preferably has a prestressing guide element 101, in particular a prestressing guide groove.
• the spindle element 47 preferably has a spindle guide element 102, in particular a spindle guide groove.
• the holding element 39 particularly preferably has a holding guide element 103, in particular a holding guide groove.
• the respective guide recesses 99 are furthermore preferably coupled to the dowel pin 97.
• the guide recesses 99 are provided to control an axial movement of the holding element and / or the prestressing element 77 (FIG. 10) relative to the spindle element 47 by means of the clamping pin 97 guided in or on the guide recesses 99.
• the guide recesses 99 are each designed as elongated holes.
• the elongated holes can each be at least partially straight and / or curved.
• At least one guide recess 99 can have an extension along the output axis A, which is provided to limit an axial movement of the holding element 39.
• the dowel pin 97 is provided to be guided along the guide recesses 99 so that a movement of the holding element 39 with respect to the pretensioning element 77 and the spindle element 47 is enabled to move the quick release device 23 from a clamping state to a release state and vice versa.
• an interaction of the guide unit 95 and the clamping unit 51 has the effect that the holding element 39 is controlled from a release state to a clamping state or from a release state to a holding state or a clamping state and vice versa.
• the dowel pin is to be pushed through the pretensioning guide element 101, the spindle guide element 102 and the holding guide element 103 and to be guided in the axial direction along the guide element in order to enable a forced movement of the holding element relative to the spindle element.
• an axial movement of the holding element with respect to the spindle element is limited by the clamping element 61 and the further clamping element 63.
• the two clamping elements 61, 63 form two threads with the two intermediate clamping elements 81, 83.
• the guide elements 99, 101, 102, 103 are curved in such a way, in particular at least in sections straight and / or curved, that a thread is blocked and a further thread is released during a transition from a release state to a holding state and during a transition from a holding state both threads are released in a clamping state.
• the quick release device 23 has a spring element 105 which is provided to preload the holding element 39 in a released state with respect to the preload element 77 and / or the spindle element 47.
• the spring element 105 is designed as a tension / compression spring.
• the spring element 105 is mounted in a cavity of the holding element 39.
• the spring element 105 is provided to preload the dowel pin 97 or the unlocking bolt 29.
• the spring element 105 is more strongly pretensioned in a released state than in a tensioned state.
• the quick release device 23 can have a further spring element 107, which is provided around the prestressing element 77 in the circumferential direction to preload the output shaft A with respect to the spindle element 47 (FIG. 10).
• the further spring element 107 is designed as a torsion spring.
• the torsion spring surrounds the holding element 39 in one plane through 360 °.
• the further spring element 107 can connect to the prestressing element 77 in the axial direction.
• the further spring element 107 is provided to clamp the prestressing element 77 in a clamping state with respect to the spindle element 47.
• the further spring element 107 is more strongly tensioned in a tensioned state than in a released state.
• the torsion spring is pretensioned or relaxed as a function of a rotational movement of the holding element 39 with respect to the spindle element 47.
• the torsion spring has two legs. A first leg is positively connected to the prestressing element 77 and is arranged in an axially extending shaped recess 109 of the prestressing element 77. A second leg is positively connected, in particular non-rotatably, indirectly or directly to the spindle element 47 and is arranged in an axially extending further shaped recess.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
• Gripping On Spindles (AREA)
• Portable Power Tools In General (AREA)
• Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Applications Claiming Priority (2)

Publications (1)

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• 2019
  • 2019-12-23 DE DE102019220539.9A patent/DE102019220539A1/de active Pending
• 2020
  • 2020-12-10 US US17/782,657 patent/US20220388109A1/en active Pending
  • 2020-12-10 EP EP20824524.1A patent/EP4081368A1/de active Pending
  • 2020-12-10 WO PCT/EP2020/085579 patent/WO2021130026A1/de unknown
  • 2020-12-10 CN CN202080089680.2A patent/CN114867581A/zh active Pending
  • 2020-12-10 JP JP2022535804A patent/JP2023518632A/ja active Pending

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