Quick Clamping Device

Abstract

A quick clamping device for a machine tool, in particular for a hand-held machine tool, includes at least one clamping device that is moveably mounted in particular on an output spindle of the machine tool that can be rotationally driven about an output shaft of the machine tool, at least for axially securing a tool device, in particular an insert tool, on the output spindle of the machine tool. The quick clamping device includes at least one movement securing unit having at least one movement securing element arranged in particular on the clamping device, which is provided for a movement of the tool device, in particular in a rotary drive position, and/or for securing the tool device.

Description

PRIOR ART

A quick-clamping system for a power tool, in particular for a hand-held power tool, having at least one clamping device which is mounted in a movable manner in particular on an output spindle of the power tool, it being possible for said output spindle to be driven in rotation about an output axis of the power tool, and is intended at least for axially securing a tool device, in particular an insertion tool, on the output spindle of the power tool has already been proposed.

DISCLOSURE OF THE INVENTION

The invention proceeds from a quick-clamping system for a power tool, in particular for a hand-held power tool, having at least one clamping device which is mounted in a movable manner in particular on an output spindle of the power tool, it being possible for said output spindle to be driven in rotation about an output axis of the power tool, and is intended at least for axially securing a tool device, in particular an insertion tool, on the output spindle of the power tool.

It is proposed that the quick-clamping system should comprise at least one movement-securing unit, which has at least one movement-securing element which is arranged in particular on the clamping device and is provided for moving the tool device, in particular into a rotary carry-along position, and/or for securing the tool device. The quick-clamping system is preferably designed to be fixed to the power tool, in particular to a main body of the power tool. As an alternative, it is conceivable for the quick-clamping system to be designed such that it can be arranged in a releasable manner on the power tool, in particular on the main body and/or on the output spindle. The quick-clamping system is provided preferably for fastening the tool device of the power tool, in particular without tools being required. The tool device is designed preferably in the form of an insertion tool, for example a saw blade, an abrasive pad or the like. In particular in a state in which the tool device is secured on the power tool by means of the quick-clamping system, the tool device can be driven, preferably in rotation, by the output spindle of the power tool. Axial securing of the tool device constitutes, in particular, securing of the tool device along an axial direction of the output axis of the power tool. “Provided” should be understood to mean, in particular, specifically designed and/or equipped. The fact that an object is provided for a specific function should be understood to mean, in particular, that the object performs and/or executes this specific function in at least one use state and/or operating state.

For axially securing the tool device on the output spindle, the clamping device preferably comprises at least one hook device, preferably two hook devices. A hook device should be understood to mean, in particular, a rotatable, pivotable and/or displaceable device which has at least one active surface for transmitting a clamping-force action to the tool device. It is preferably the case that the hook devices are designed to be capable of relative movement, in particular pivoting movement about a pivot axis. The hook devices preferably have a common movement axis, in particular a common pivot axis. However, it is also conceivable for the hook devices to have different movement axes, in particular at least essentially parallel pivot axes. “Essentially parallel” should be understood to mean, in particular, an orientation of a direction relative to a reference direction, in particular in a plane, in which the direction deviates in relation to the reference direction by, in particular, less than 8°, advantageously less than 5° and particularly advantageously less than 2°. The movement axis, in particular the pivot axis, of the clamping device, in particular of the hook devices, runs preferably in a plane which runs transversely, in particular at least essentially perpendicularly, to the output axis. The movement axis, in particular the pivot axis, of the clamping device preferably forms a clamping-device axis of rotation. As seen along the axial direction of the output axis, the hook devices can be preferably essentially of C-shaped design. In particular, as seen along the axial direction of the output axis, two mutually opposite hook devices can be at least essentially in the form of a sideways eight or an infinity symbol. The expression “essentially perpendicularly” is intended to define, in particular, an orientation of a direction relative to a reference direction in which, as seen in particular in a plane, the direction and the reference direction enclose an angle of 90° and the angle has a maximum deviation of, in particular, less than 8°, advantageously less than 5° and particularly advantageously less than 2°.

The hook devices can be designed to be capable of movement relative to one another, in particular pivoting movement about the pivot axis, in an angle range of up to 50°, preferably of up to 40°, preferably of up to 30°, particularly preferably of up to 20°. The clamping device or the hook devices can have, in particular, at least two states, in particular a fastening state or a release state. In a fastening state, the hook devices have been extended in a radial direction away from the output axis, in particular such that, in an extended state, the hook devices assume a maximum radial extent in relation to one another. In a fastening state, the hook devices have been connected to the tool device, in particular engaged therewith, in particular as a result of the hook devices moving in the radial direction of the output axis, wherein the tool device can be retained on the power tool in a form-fitting and/or force-fitting manner by means of the hook devices. In a fastening state, the tool device has been connected to the quick-clamping system in a form-fitting manner in the axial direction of the output axis. In a release state, the clamping device has, in particular the hook devices have, been retracted in the radial direction toward the output axis, in particular such that the clamping device has, in particular the hook devices have, a maximum radial extent along a direction running at least essentially perpendicularly to the output axis, said maximum radial extent being smaller than a minimum radial extent of the aperture of the tool device. The clamping device, in particular the hook devices, can preferably be transferred from a release state into a fastening state by virtue of the tool device being introduced into the quick-clamping system in the axial direction of the output axis. The clamping device, in particular the hook devices, can be understood to be “projecting” if the clamping device projects or overhangs in relation to a positioning region which is intended for the axial positioning of the tool device and limits movement of the tool device, in a fastening state or a release state, in the axial direction of the output axis. The term “output axis” preferably denotes an imaginary geometrical axis of rotation of the quick-clamping system and/or of the output spindle of the power tool or an imaginary axis of rotation of the tool device in a state in which the latter is arranged, in particular fixed, on the quick-clamping system.

The movement-securing unit, in particular the movement-securing element, is preferably provided in addition to the clamping device, for additional securing of the tool device. However, it is also conceivable for the movement-securing unit to be provided as an alternative to the clamping device, for securing the tool device. The movement-securing unit, in particular the movement-securing element, is provided in particular for radial or axial securing of the tool device, preferably for radial and axial securing of the tool device, in particular in a state in which the tool device is arranged in the quick-clamping system. The movement-securing element is preferably provided for tool-free, in particular automatic, securing of the tool device. The movement-securing element, provided in particular for securing the tool device, can be designed, in particular, in the form of a plug-in element, for example in the form of a bolt, a connecting pin or the like, in the form of a latching element or in the form of some other movement-securing element which appears to be expedient to a person skilled in the art.

As an alternative or in addition to securing the tool device, the movement-securing element is provided preferably for realizing a movement of the tool device, in particular into a rotary carry-along position. A tool device located in a rotary carry-along position can preferably be driven in particular by the output spindle and in particular in rotation. The movement-securing element is preferably provided for moving, in particular for rotating, the tool device about the output axis. The movement-securing element provided in particular for moving the tool device can be designed, in particular in the form of a shaping of the hook devices which causes the tool device to move as a result of a contact pressure of the tool device, in particular while the tool device is being fastened in the quick-clamping system. As an alternative, it is conceivable for the movement-securing element provided in particular for moving the tool device to be designed in the form of a bearing element, for example in the form of a ball bearing or the like, in the form of a drive element, in particular a motor-driven one, or in the form of some other movement-securing element which appears to be expedient to a person skilled in the art. It is preferably the case that a movement-securing element is arranged on the hook devices, in particular on all the hook devices, of the clamping device. The movement-securing unit preferably comprises a plurality of movement-securing elements, in particular different ones, which interact preferably for moving and/or securing the tool device.

The configuration of the quick-clamping system according to the invention can advantageously allow convenient installation of a tool device on a power tool. User-safe fastening of the tool device on the power tool and advantageously precise orientation of the tool device on the quick-clamping system can advantageously be achieved. It is possible to provide a quick-clamping system which allows advantageously convenient, reliable and precise operation of a tool device on a power tool.

It is also proposed that the at least one movement-securing element arranged in particular on the clamping device should be designed as a holder and should be provided so that, in at least one state, it at least partially accommodates a further movement-securing element of the movement-securing unit, said further movement-securing element engaging through the tool device and being designed in the form of an extension, in particular an axially extending one. In a state in which the tool device is arranged on the quick-clamping system, in particular in an actuating state of the clamping device, the further movement-securing element preferably engages through the tool device, in particular through a securing aperture of the tool device. The movement-securing element designed in the form of a holder preferably has an accommodating region for accommodating the further movement-securing element, which is designed in the form of an extension. The accommodating region can be designed preferably in the form of an aperture, in the form of a depression, in the form of a convexity in the movement-securing element designed in the form of a holder, or in the form of some other accommodating region which appears to be expedient to a person skilled in the art. The extension can be designed, in particular, in the form of a bolt, in the form of a connecting pin, in the form of a connecting stub, in the form of a latching nose or in the form of some other extension which appears to be expedient to a person skilled in the art. It is preferably the case that the movement-securing element designed in the form of a holder is provided for accommodating the further movement-securing element, which is designed in the form of an extension, for movement, in particular at least essentially axial movement, in the direction of the further movement-securing element, which is designed in the form of an extension. As an alternative, it is conceivable for the further movement-securing element, which is designed in the form of an extension, to be provided for accommodation by the movement-securing element designed in the form of a holder, for movement, in particular at least essentially axial movement, in the direction of the movement-securing element designed in the form of a holder, or for the two movement-securing elements to be moved toward one another. It is preferably the case that the movement-securing element designed in the form of a holder and/or the further movement-securing element, which is designed in the form of an extension, to move in particular automatically and/or without tools being required, as a result of the tool device being fastened on the quick-clamping system. As an alternative, it is conceivable for the movement-securing element designed in the form of a holder and/or the further movement-securing element, which is designed in the form of an extension, to move as a result of automatic actuation at least of one of the movement-securing elements. It is preferably the case that in each case at least one movement-securing element designed in the form of a holder and at least one further movement-securing element, which is designed in the form of an extension, are arranged on each hook device of the clamping device. Reliable and precise fastening of the tool device on the quick-clamping system can advantageously be achieved.

It is further proposed that the movement-securing unit should be provided to convert a relative movement of the clamping device into a relative movement of the tool device. The movement-securing unit is provided, in particular, to convert a relative movement, in particular a pivoting movement, of the clamping device, in particular of the hook devices, relative to the power tool, in particular relative to the output spindle, into a relative movement of the tool device. The movement-securing unit is provided preferably to convert a relative movement of the clamping device into a relative movement, in particular a rotating movement, of the tool device relative to the clamping device, in particular relative to the hook devices. In particular, the movement-securing unit is provided so that a force which acts on the tool device at least essentially in the axial direction as a result of the relative movement of the clamping device is converted by said unit into a force which acts on the tool device at least essentially in a circumferential direction. The force which acts on the tool device in the circumferential direction preferably causes a relative movement of the tool device. The circumferential direction is, in particular, in the form of a direction which runs at least essentially in the form of a circular ring, and in particular at least in a radial plane, about the output axis. The movement-securing unit is preferably provided by a shaping of the clamping device, in particular of the hook devices, and/or of the tool device for converting a relative movement of the clamping device into a relative movement of the tool device. Essentially automatic and precise orientation of the tool device on the quick-clamping system can advantageously be achieved.

It is also proposed that the at least one movement-securing element arranged in particular on the clamping device should be designed in the form of an oblique surface, which is provided to generate, in dependence on a movement of the clamping device, a force component which acts on the tool device along a circumferential direction. The movement-securing element designed in the form of an oblique surface is preferably formed in one piece with the clamping device, in particular with the hook device. As an alternative, it is conceivable for the movement-securing element designed in the form of an oblique surface to be arranged in a releasable manner on the clamping device, in particular on the hook device. The oblique surface is preferably arranged at an acute angle on the clamping device, in particular on the hook device. Each of the hook devices of the clamping device preferably has in each case at least one movement-securing element designed in the form of an oblique surface. The tool device preferably has at least one oblique surface designed in particular to complement the movement-securing element designed in the form of an oblique surface. The force component which acts on the tool device along the circumferential direction is preferably generated by a sliding movement of the tool device on the movement-securing element designed in the form of an oblique surface, in particular as a result of the relevant movement of the clamping device, in particular of the hook devices. A force component which acts on the tool device in the circumferential direction can advantageously be generated by adaptation of the geometry of the clamping device, in particular of the hook device. It is advantageously possible to provide a cost-effective movement-securing unit which allows essentially automatic and precise orientation of the tool device on the quick-clamping system.

In addition, it is proposed that the movement-securing unit should have at least one further movement-securing element, which is arranged in particular on the output spindle and is designed in the form of a conical extension, which is provided to interact with a fixing aperture of the tool device. The movement-securing unit preferably comprises a plurality of further movement-securing elements, which are designed in the form of conical extensions and are arranged on the output spindle, in particular, at a radial spacing apart from the clamping device and, in particular, along a circular ring around the clamping device. The tool device preferably comprises a number of fixing apertures corresponding to a number of further movement-securing elements, which are designed in the form of conical extensions. The further movement-securing element, which is designed in the form of a conical extension, is preferably of conical design as seen along the pivot axis. As an alternative or in addition, it is conceivable for the further movement-securing element, which is designed in the form of a conical extension, to be of conical design as seen along the axial direction of the output axis. In particular, the further movement-securing element, which is designed in the form of a conical extension, is provided so that the tool device, which is moved by the oblique surface, is clamped firmly by said further movement-securing element as the latter interacts with the fixing aperture of the tool device. It is preferably the case that the fixing aperture of the tool device is of conical design to complement the further movement-securing element, which is designed in the form of a conical extension, and/or has a conical cross section designed in particular to complement the conical extension. In a state in which the tool device is fastened on the quick-clamping system, in particular in a fastening state of the clamping device, the conical extension and the fixing aperture preferably interact. The conical extension preferably engages in the fixing aperture, in particular in a flush manner. It is preferably the case that the conical extension can be brought into engagement with the fixing aperture as a result of the tool device being moved by the oblique surface. While the tool device is being fastened on the quick-clamping system, the tool device moves, preferably on account of the oblique surface, relative to the further movement-securing element, which is designed in the form of a conical extension, such that the further movement-securing element, which is designed in the form of a conical extension and is previously arranged in a wide sub-portion of the fixing aperture, clamps the tool device firmly in a rotary carry-along position, with arrangement in a narrow sub-portion of the fixing aperture. Reliable fastening of the tool device and precise orientation of the tool device on the quick-clamping system can advantageously be achieved.

It is also proposed that the movement-securing unit should have at least one pre-positioning element, which is provided to pre-position the tool device prior to the latter being secured by means of the clamping device. In particular, the pre-positioning element is provided to retain the tool device on the quick-clamping system counter to a gravitational force which acts on the tool device, prior to the latter being secured by means of the clamping device. The pre-positioning element is arranged, in particular on the output spindle, at a radial spacing apart from the clamping device preferably along a circumferential direction, or extends at least in part along the circumferential direction. The pre-positioning element can be provided preferably for pre-positioning the tool device by means of a magnetic, of an electrostatic, of a mechanical, of a pneumatic force and/or of some other force which appears to be expedient to a person skilled in the art. The pre-positioning element can be designed, in particular, in the form of a magnet, of an electrostatically charged plate, of a radially acting latching-action spring bolt, of an adhesive pad, of a suction cup or of some other pre-positioning element which appears to be expedient to a person skilled in the art. The movement-securing unit can preferably have a plurality of pre-positioning elements, in particular arranged along the circumferential direction. Precise pre-positioning of the tool device can advantageously allow convenient installation of the tool device.

It is further proposed that the pre-positioning element should be designed in the form of a magnet. The pre-positioning element is preferably designed in the form of a permanent magnet. As an alternative, it is conceivable for the pre-positioning element to be designed in the form of an electromagnet. The pre-positioning element designed in the form of a magnet preferably has a retaining force which is greater than a weight-induced force of the tool device. The movement-securing unit preferably comprises a plurality of pre-positioning elements designed in the form of magnets. In particular, the pre-positioning element can be designed in the form of an annular magnet, which extends in particular at least in part along the circumferential direction. Precise and at least essentially wear-free pre-positioning of the tool device can advantageously be achieved.

It is also proposed that the movement-securing unit should have at least one linear abutment element, onto which the tool device can be pushed by means of the clamping device. The linear abutment element is preferably arranged at least partially along the circumferential direction. In particular, the linear abutment element is designed at least essentially symmetrically, in particular about the output axis forming the axis of symmetry. The linear abutment element is preferably designed in the form of a closed line. As seen in particular in the radial direction of the output axis, the linear abutment element has, in particular, a width of at most 10 mm, preferably a width of at most 5 mm and particularly preferably a width of at most 2 mm. In a fastening state of the clamping device, it is preferably the case that the clamping device pushes, in particular the hook devices push, the tool device onto the linear abutment element. In a state in which the tool device is fastened on the quick-clamping system, in particular in a fastening state of the clamping device, the linear abutment element is preferably oriented at least essentially parallel to a main-extent plane, in particular to a tool-abutment surface, of the tool device. A “main-extent plane” of a unit should be understood to mean, in particular, a plane which is parallel to the largest side surface of the smallest imaginary cuboid which only just encloses the unit in full, said plane running in particular through the center point of the cuboid. The tool-abutment surface is, in particular, a surface of the tool device which, in a state in which the tool device is arranged on the quick-clamping system, in particular in a fastening state of the clamping device, butts against the linear abutment element. As an alternative or in addition to the linear abutment element, it is conceivable for the movement-securing unit to have at least one engagement element, in particular a conically shaped engagement element. In particular, the engagement element is provided so that, in particular in a state in which the tool device is fastened on the quick-clamping system, it engages in a depression element of the tool device, in particular a conically shaped depression element. In particular in a fastening state of the clamping device, the engagement element can preferably be pushed into the depression element of the tool device by means of the clamping device, in particular by means of the hook devices. In particular, the depression element can be designed in the form of a depression in the tool device, in the form of an aperture in the tool device or in the form of some other depression element which appears to be expedient to a person skilled in the art. Precise orientation of the tool device on the quick-clamping system can advantageously be achieved. Advantageous concentricity of the tool device with a low risk of imbalance can be made possible.

In addition, it is proposed that the linear abutment element should be designed, at least in part, in the form of a circular ring. It is preferably the case that the entire abutment element is designed in the form of a circular ring. In particular, the linear abutment element is designed, at least in part, in the form of a circular ring which is symmetrical about the output axis. The movement-securing unit can preferably have a plurality of linear abutment elements which, in particular forming portions of a circular ring, are arranged at least in the form of a circular ring. It is advantageously possible to achieve at least essentially uniform contact pressure at least essentially along a complete circumference of the tool device. Precise orientation of the tool device on the quick-clamping system can advantageously be achieved.

The invention also proceeds from a power tool, in particular from a hand-held power tool, having at least one quick-clamping system according to the invention. In particular, the power tool can be designed in the form of a grinder, in particular in the form of an angle grinder, in the form of a saw, in the form of a multifunctional tool or in the form of some other power tool which appears to be expedient to a person skilled in the art. The power tool can preferably have further components, in particular components which are necessary for operation of the power tool. In particular, the power tool can have a housing, a handle, a power-supply unit, for example a (rechargeable) battery, a battery, a mains supply or the like, a drive unit, an output unit and/or other components which appear to be expedient to a person skilled in the art. It is advantageously possible to provide a power tool on which a tool device can be fastened conveniently and reliably.

The quick-clamping system according to the invention and/or the power tool according to the invention should not be limited here to the embodiment and use described above. In particular, in order to perform a function described herein, the quick-clamping system according to the invention and/or the power tool according to the invention can have a number of individual elements, components and units which differs from the number mentioned herein. In addition, in the case of the ranges of values specified in this disclosure, values lying within the stated limits are also to be considered as disclosed and usable in any way desired.

DRAWINGS

Further advantages can be gathered from the following description of the drawings. The drawings illustrate four exemplary embodiments of the invention. The drawings, the description and the claims contain numerous features in combination. A person skilled in the art will expediently also consider the features individually and combine them to give further advantageous combinations. In the drawings:

FIG. 1 shows a schematic illustration of a power tool according to the invention,

FIG. 2 shows a schematic sectional illustration of a first quick-clamping system according to the invention,

FIG. 3 shows a schematic illustration of a tool device,

FIG. 4 shows a schematic sectional illustration of a second, alternative quick-clamping system,

FIG. 5 shows a schematic sectional illustration of a third, alternative quick-clamping system,

FIG. 6 shows a detail of the third, alternative quick-clamping system, and

FIG. 7 shows a schematic sectional illustration of a fourth, alternative quick-clamping system.

DESCRIPTION OF THE EXEMPLARY EMBODIMENTS

FIG. 1 shows a perspective illustration of a power tool 12a. The power tool 12a is designed in the form of a hand-held power tool. The power tool 12a is designed in the form of a grinder. The power tool 12a is designed in the form of an angle grinder. As an alternative, it is conceivable for the power tool 12a to be designed in the form of a saw, of a multifunctional tool or the like. The power tool 12a comprises a quick-clamping system 10a (not illustrated any more specifically). A tool device 20a is arranged on the power tool 12a by means of the quick-clamping system 10a. The tool device 20a is designed in the form of an insertion tool. The tool device 20a is designed in the form of an abrasive pad. As an alternative, it is conceivable for the tool device 20a to be designed in the form of a saw blade or the like. The power tool 12a has a housing unit 46a. Within the housing unit 46a, the power tool 12a comprises a drive unit 48a and an output unit 50a. The drive unit 40a is provided for driving the output unit 50a. The output unit 50a is provided to drive the tool device 20a in rotation about an output axis 14a by means of an output spindle 16a of the power tool 12a. The power tool 12a can comprise further components which are necessary for operating the power tool 12a.

FIG. 2 shows a schematic sectional illustration of the quick-clamping system 10a. The quick-clamping system 10a is fixed to the power tool 12a. As an alternative, it is conceivable for the quick-clamping system 10a to be designed such that it can be arranged in a releasable manner on the power tool 12a, in particular on a main body and/or on an output spindle 16a of the power tool 12a. The quick-clamping system 10a comprises a clamping device 18a. The clamping device 18a is mounted in a movable manner on the output spindle 16a of the power tool 12a, it being possible for said output spindle to be driven in rotation about the output axis 14a of the power tool 12a. The clamping device 18a is provided for axially securing the tool device 20a on the output spindle 16a of the power tool 12a, said tool device being designed in the form of an insertion tool.

The quick-clamping system 10a comprises a movement-securing unit 22a. The movement-securing unit 22a has at least one movement-securing element 24a, 26a which is arranged in particular on the clamping device 18a. The at least one movement-securing element 24a, 26a is provided for moving the tool device 20a, in particular into a rotary carry-along position, and/or for securing the tool device 20a. The quick-clamping system 10a is provided for fastening the tool device 20a on the power tool 12a, in particular without tools being required. In a state in which the tool device 20a is secured on the power tool 12a by means of the quick-clamping system 10a, the tool device 20a can be driven in rotation by the output spindle 16a of the power tool 12a. Axial securing of the tool device 20a constitutes securing of the tool device 20a along an axial direction of the output axis 14a.

For axial securing of the tool device 20a on the output spindle 16a, the clamping device 18a comprises a first hook device 52a and a second hook device 54a. The hook devices 52a, 54a are designed in the form of hook jaws. The second hook device 54a is designed essentially analogously to the first hook device 52a. The hook devices 52a, 54a are designed to be capable of relative movement, in particular pivoting movement about a pivot axis 56a. The hook devices 52a, 54a have a common pivot axis 56a. However, it is also conceivable for the hook devices 52a, 54a to have different pivot axes. The pivot axis 56a of the clamping device 18a, in particular of the hook devices 52a, 54a, runs in a plane running transversely, in particular essentially perpendicularly, to the output axis 14a. The pivot axis 56a of the clamping device 18a forms a clamping-device axis of rotation. As seen along the output axis 14a, the hook devices 52a, 54a are essentially of C-shaped design. As seen along the output axis 14a, the two mutually opposite hook devices 52a, 54a are essentially in the form of a sideways eight or an infinity symbol.

The hook devices 52a, 54a are designed to be capable of movement relative to one another, in particular pivoting movement about the pivot axis 56a, in an angle range of up to 50°, preferably of up to 40°, preferably of up to 30°, particularly preferably of up to 20°.The clamping device 18a or the hook devices 52a, 54a can have two states. The clamping device 18a or the hook devices 52a, 54a can have a fastening state or a release state. In a fastening state, the hook devices 52a, 54a have been extended in a radial direction away from the output axis 14a, in particular such that, in an extended state, the hook devices 52a, 54a assume a maximum radial extent in relation to one another. In a fastening state, the hook devices 52a, 54a have been connected to the tool device 20a. In a fastening state, the hook devices 52a, 54a have been engaged with the tool device 20a as a result of the hook devices 52a, 54a moving in the radial direction of the output axis 14a. The tool device 20a can be retained on the power tool 12a in a form-fitting and/or force-fitting manner by means of the hook devices 52a, 54a. In a fastening state, the tool device 20a has been connected to the quick-clamping system 10a in a form-fitting manner in the axial direction of the output axis 14a. In a release state, the clamping device 18a has, in particular the hook devices 52a, 54a have, been retracted in the radial direction toward the output axis 14a such that the clamping device 18a has, in particular the hook devices 52a, 54a have, a maximum radial extent along a direction running essentially perpendicularly to the output axis 14a, said maximum radial extent being smaller than a minimum radial extent of an aperture of the tool device 20a. The clamping device 18a, in particular the hook devices 52a, 54a, can be transferred from a release state to a fastening state by virtue of the tool device 20a being introduced into the quick-clamping system 10a in the axial direction of the output axis 14a. FIG. 2 illustrates the hook devices 52a, 54a in a release state.

The movement-securing unit 22a has a first movement-securing element 24a and a second movement-securing element 26a. The first movement-securing element 24a is arranged on the first hook device 52a. The first movement-securing element 24a is arranged on a first inner side 58 of the first hook device 52a. The second movement-securing element 26a is arranged on the second hook device 54a. The second movement-securing element 26a is arranged on a second inner side 60 of the second hook device 54a. As an alternative, it is conceivable for the movement-securing elements 24a, 26a to be arranged on other inner sides and/or outer sides of the hook devices 52a, 54a. The movement-securing elements 24a, 26a are provided for realizing movement of the tool device 20a, in particular into a rotary carry-along position. A tool device 20a which is located in a rotary carry-along position can be driven in rotation by the output spindle 16a. The movement-securing elements 24a, 26a are provided for moving, in particular for rotating, the tool device 20a about the output axis 14a. The movement-securing elements 24a, 26a provided for moving the tool device 20a are designed in the form of shapings of the hook devices 52a, 54a which cause the tool device 20a to move as a result of a contact pressure of the tool device 20a, in particular while the tool device 20a is being fastened in the quick-clamping system 10a. The movement-securing elements 24a, 26a are designed in the form of oblique surfaces. As an alternative, it is conceivable for the movement-securing elements 24a, 26a provided for moving the tool device 20a to be designed in the form of bearing elements, for example in the form of ball bearings or the like, or in the form of motor-driven drive elements or the like. The movement-securing elements 24a, 26a interact in order to move the tool device 20a. The movement-securing unit 22a is provided to convert a relative movement of the clamping device 18a into a relative movement of the tool device 20a. The movement-securing unit 22a is provided to convert a pivoting movement of the clamping device 18a, in particular of the hook devices 52a, 54a, relative to the power tool 12a, in particular relative to the output spindle 16a, into a relative movement of the tool device 20a. The movement-securing unit 22a is provided to convert a relative movement of the clamping device 18a into a rotating relative movement of the tool device 20a relative to the clamping device 18a, in particular relative to the hook devices 52a, 54a. The movement-securing unit 22a is provided so that a force component which acts on the tool device 20a essentially in the axial direction as a result of the relative movement of the clamping device 18a is converted by said unit into a force component which acts on the tool device 20a essentially in a circumferential direction. The force which acts on the tool device 20a in the circumferential direction causes a relative movement of the tool device 20a. The circumferential direction is in the form of a direction which runs essentially in the form of a circular ring, and in a radial plane, about the output axis 14a. The movement-securing unit 22a is provided by a shaping of the clamping device 18a, in particular of the hook devices 52a, 54a, and/or of the tool device 20a for converting a relative movement of the clamping device 18a into a relative movement of the tool device 20a.

The at least one movement-securing element 24a, 26a arranged in particular on the clamping device 18a is designed in the form of an oblique surface. The oblique surface is provided to generate, in dependence on a movement of the clamping device 18a along a circumferential direction, a force component which acts on the tool device 20a. The movement-securing elements 24a, 26a designed in the form of oblique surfaces are formed in one piece with the clamping device 18a, in particular with the hook devices 52a, 54a. As an alternative, it is conceivable for the movement-securing elements 24a, 26a designed in the form of oblique surfaces to be arranged in a releasable manner on the clamping device 18a, in particular on the hook devices 52a, 54a. The oblique surfaces are arranged at an acute angle on the clamping device 18a, in particular on the hook devices 52a, 54a. Each of the hook devices 52a, 54a of the clamping device 18a has in each case at least one movement-securing element 24a, 26a designed in the form of an oblique surface. The tool device 20a can have at least one oblique surfaces designed to complement the movement-securing elements 24a, 26a designed in form of oblique surfaces. The force component which acts on the tool device 20a along the circumferential direction is generated by a sliding movement of the tool device 20a along the movement-securing elements 24a, 26a designed in the form of oblique surfaces, as a result of the relative movement of the clamping device 18a, in particular of the hook devices 52a, 54a.

The movement-securing unit 22a has at least one further movement-securing element 32a, 34a, which is arranged in particular on the output spindle 16a and is designed in the form of a conical extension, which is provided to interact with a fixing aperture 36a, 38a of the tool device 20a (cf. FIG. 3). The movement-securing unit 22a has a first further movement-securing element 32a, which is designed in the form of a conical extension, and a second further movement-securing element 34a, which is designed in the form of a conical extension. The movement-securing unit 22c can have a number other than two of further movement-securing elements 32a, 34a, which are designed in the form of conical extensions and are arranged on the output spindle 16a at a radial spacing apart from a clamping device 18a and in the form of a circle around the clamping device 18a. The tool device 20a comprises a number of fixing apertures 36a, 38a corresponding to a number of further movement-securing elements 32a, 34a, which are designed in the form of conical extensions. The further movement-securing elements 32a, 34a, which are designed in the form of conical extensions, are arranged on an abutment surface 62a of the output spindle 16a. In a state in which the tool device 20a is arranged on the quick-clamping system, the tool device 20a has been pushed onto the abutment surface 62a. The further movement-securing elements 32a, 34a, which are designed in the form of conical extensions, are of conical design as seen in the direction of the pivot axis 56a. The further movement-securing elements 32a, 34a, which are designed in the form of conical extensions, are arranged outside an internal diameter 64a of the clamping device 18a. The further movement-securing elements 32a, 34a, which are designed in the form of conical extensions, are provided so that the tool device 20a, which is moved by the oblique surfaces, is clamped firmly by said further movement-securing elements as the latter interact with the fixing apertures 36a, 38a of the tool device 20a.

FIG. 3 shows a schematic illustration of the tool device 20a. It illustrates a hub of the tool device 20a. The tool device 20a has a first fixing aperture 36a and a second fixing aperture 38a. The fixing apertures 36a, 38a are of conical design along the circumferential direction. The fixing apertures 36a, 38a of the tool device 20a are of conical design to complement the further movement-securing elements 32a, 34a, which are designed in the form of conical extensions. In a state in which the tool device 20a is fastened on a quick-clamping system 10a, in particular in a fastening state of the clamping device 18a, the conical extensions and the fixing apertures 36a, 38a interact. While the tool device 20a is being fastened on the quick-clamping system 10a, the tool device moves, on account of the oblique surfaces, relative to the further movement-securing elements 32a, 34a, which are designed in the form of conical extensions, such that the further movement-securing elements 32a, 34a, which are designed in the form of conical extensions and are previously arranged in wide sub-portions 66a of the fixing apertures 36a, 38a, clamp the tool device 20a firmly in narrow sub-portions 68a of the fixing apertures 36a, 38a, with arrangement in a rotary carry-along position.

FIGS. 4 to 7 show three further exemplary embodiments of the invention. The descriptions below and the drawings are limited essentially to the differences between the exemplary embodiments, wherein, as far as components with like references are concerned, in particular as far as components with like reference signs are concerned, reference can basically also be made to the drawings and/or the description relating to the other exemplary embodiments, in particular those of FIGS. 1 to 3. In order to distinguish between the exemplary embodiments, the letter a has been placed after the reference sign of the exemplary embodiment in FIGS. 1 to 3. The letter a has been replaced by the letters b to d in the exemplary embodiments of FIGS. 4 to 7.

FIG. 4 shows a schematic sectional illustration of a second, alternative quick-clamping system 10b. The quick-clamping system 10b is illustrated along the same sectional plane as the quick-clamping system 10a of the first exemplary embodiment in FIG. 1. A movement-securing unit 22b of the quick-clamping system 10b has at least one further movement-securing element 32b, 34b, which is arranged in particular on the output spindle 16b and is designed in the form of a conical extension, which is provided to interact with a fixing aperture 36b, 38b of a tool device 20b. The movement-securing unit 22b has a first further movement-securing element 32b, which is designed in the form of a conical extension, and a second further movement-securing element 34b, which is designed in the form of a conical extension. The movement-securing unit 22b can have a number other than two of further movement-securing elements 32b, 34b, which are designed in the form of conical extensions and are arranged on the output spindle 16b at a radial spacing apart from a clamping device 18b and in the form of a circular ring around the clamping device 18b. The tool device 20b comprises a number of fixing apertures 36b, 38b corresponding to a number of further movement-securing elements 32b, 34b, which are designed in the form of conical extensions. The further movement-securing elements 32b, 34b, which are designed in the form of conical extensions, are of conical design as seen along the output axis 14b. The further movement-securing elements 32b, 34b, which are designed in the form of conical extensions, are provided for fixing the tool device in the axial direction of the output axis 14b.The fixing apertures 36b, 38b of the tool device 20b have conical cross sections designed to complement the conical extensions. In a state in which the tool device 20b is fastened on a quick-clamping system 10b, in particular in a fastening state of the clamping device 18b, the conical extensions and the fixing apertures 36b, 38b interact. The conical extensions each engage in the fixing apertures 36b, 38b in a flush manner.

FIG. 5 shows a schematic sectional illustration of a third, alternative quick-clamping system 10c. The quick-clamping system 10c is illustrated along the same sectional plane as the quick-clamping system 10a of the first exemplary embodiment in FIG. 1. A movement-securing unit 22c of the quick-clamping system 10c comprises movement-securing elements 24c, 26c designed in the form of carry-along jaws for rotary carry-along of a tool device 20c. the movement-securing unit 22c has a linear abutment element 44c. The linear abutment element 44c is provided instead of the abutment surface 62a of the first exemplary embodiment. The tool device 20c can be pushed onto the linear abutment element 44c by means of a clamping device 18c. The linear abutment element 44c is arranged along a circumferential direction. The linear abutment element 44c is designed essentially symmetrically about an output axis 14c forming the axis of symmetry. The linear abutment element 44c is of crosspiece-like design, in the form of a closed line. In particular as seen in the radial direction of the output axis 14c, the linear abutment element 44c has, in particular, a width of at most 10 mm, preferably a width of at most 5 mm and particularly preferably a width of at most 2 mm. In a fastening state of the clamping device 18c, the clamping device 18c pushes, in particular hook devices 52c, 54c push, the tool device 20c onto the linear abutment element 44c. In a state in which the tool device 20c is fastened on the quick-clamping system 10c, in particular in a fastening state of the clamping device 18c, the linear abutment element 44c is oriented essentially parallel to a main-extent plane, in particular to a tool-abutment surface, of the tool device 20c. The tool-abutment surface is a surface of the tool device 20c which, in a state in which the tool device 20c is arranged on the quick-clamping device 10c, in particular in a fastening state of the clamping device 18c, butts against the linear abutment element 44c. As an alternative or in addition to the linear abutment element 44c, it is conceivable for the movement-securing unit 22c to have at least one conically shaped engagement element. The engagement element is provided so that, in a state in which the tool device 20c is fastened on the quick-clamping system 10c, it engages in a conically shaped depression element of the tool device 20c. In a fastening state of the clamping device 18c, the engagement element can be pushed into the depression element of the tool device 20c by means of the clamping device 18c, in particular by means of the hook devices 52c, 54c. The depression element can be designed in the form of a depression in the tool device 20c, or in the form of an aperture in the tool device 20c or the like.

The linear abutment element 44c is designed, at least in part, in the form of a circular ring. The entire linear abutment element 44c is designed in the form of a circular ring. The linear abutment element 44c is designed in the form of a circular ring which is symmetrical about the output axis 14c. The linear abutment element 44c has a larger diameter than an internal diameter 64c. The movement-securing unit 22c can have more than one linear abutment element 44c, and said linear abutment elements, forming portions of a circular ring, can be arranged in the form of a circular ring.

FIG. 6 shows a detail of the third, alternative quick-clamping system 10c. The movement-securing unit 22c has at least one pre-positioning element 40c, 42c. The pre-positioning element 40c, 42c is provided to pre-position the tool device 20c prior to the latter being secured by means of the clamping device 18c. The movement-securing unit 22c has a first pre-positioning element 40c and a second pre-positioning element 42c. The pre-positioning elements 40c, 42c are provided to retain the tool device 20c on the quick-clamping system 10c counter to a gravitational force which acts on the tool device 20c, prior to the latter being secured by means of the clamping device 18c. The pre-positioning elements 40c, 42c are arranged on the output spindle 16c at a radial spacing apart from the clamping device 18c along a circumferential direction. As an alternative, it is conceivable for the pre-positioning elements 40c, 42c to extend at least in part along the circumferential direction. The pre-positioning elements 40c, 42c are provided for pre-positioning the tool device 20c by means of a magnetic force. As an alternative, it is conceivable for the pre-positioning elements 40c, 42c to be provided for pre-positioning the tool device 20c by means of an electrostatic, of a mechanical or of a pneumatic force or the like. The pre-positioning elements 40c, 42c are designed in the form of magnets. As an alternative, it is conceivable for the pre-positioning elements 40c, 42c to be designed in the form of electrostatically charged plates, in the form of radially acting latching-action spring bolts, in the form of adhesive pads, in the form of suction cups or the like. The movement-securing unit 22c can have a number other than two of pre-positioning elements 40c, 42c. The pre-positioning elements 40c, 42c are designed in the form of permanent magnets. As an alternative, it is conceivable for the pre-positioning elements 40c, 42c to be designed in the form of electromagnets. The pre-positioning elements 40c, 42c designed in the form of magnets have a retaining force which is greater than a weight-induced force of the tool device 20c.

FIG. 7 shows a schematic sectional illustration of a fourth, alternative quick-clamping system 10d. The quick-clamping system 10d is illustrated along the same sectional plane as the quick-clamping system 10a of the first exemplary embodiment in FIG. 1. A movement-securing unit 22d of the quick-clamping system 10d has a first movement-securing element 24d and a second movement-securing element 26d. The first movement-securing element 24d is arranged on a first hook device 52d of a clamping device 18d and the second movement-securing element 26d is arranged on a second hook device 54d of the clamping device 18d. The first movement-securing element 24d is designed essentially analogously to the second movement-securing element 26d. The at least one movement-securing element 24d, 26d arranged in particular on the clamping device 18d is designed in the form of a holder. The at least one movement-securing element 24d, 26d is provided so that, in at least one state, it at least partially accommodates a further movement-securing element 28d, 30d of the movement-securing unit 22d, said further movement-securing element engaging through the tool device 20d and being designed in the form of an extension, in particular an axially extending one. The first movement-securing element 24d is provided so that, in a fastening state of the clamping device 18d, it accommodates the first further movement-securing element 28d, which engages through the tool device 20d and is designed in the form of an axially extending extension. The second movement-securing element 26d is provided so that, in a fastening state of the clamping device 18d, it accommodates the second further movement-securing element 30d, which engages through the tool device 20d and is designed in the form of an axially extending extension. The further movement-securing elements 28d, 30d, which are designed in the form of extensions, are arranged on an abutment surface 62d at a radial spacing apart from an output axis 14d. The further movement-securing elements 28d, 30d, which are designed in the form of extensions, are arranged within an internal diameter 64d. The first further movement-securing element 28d, which is designed in the form of an extension, is designed essentially analogously to the second further movement-securing element 30d, which is designed in the form of an extension. In a state in which the tool device 20d is arranged on a quick-clamping system 10d, in particular in a actuating state of the clamping device 18d, the first further movement-securing element 28d, which is designed in the form of an extension, engages through the tool device 20d, in particular through a first securing aperture 70d of the tool device 20d. In a state in which the tool device 20d is arranged on a quick-clamping system 10d, in particular in an actuating state of the clamping device 18d, the second further movement-securing element 30d, which is designed in the form of an extension, engages through the tool device 20d, in particular through a second securing aperture 72d of the tool device 20d.

The first movement-securing element 24d designed in the form of a holder has a first accommodating region 74d for accommodating the second further movement-securing element 30d, which is designed in the form of an extension. The first accommodating region 74d is designed in the form of a depression in the first movement-securing element 24d, designed in the form of a holder.

The second movement-securing element 26d designed in the form of a holder has a second accommodating region 76d for accommodating the second further movement-securing element 30d, which is designed in the form of an extension. The accommodating region 76d is designed in the form of a depression in the second movement-securing element 26d designed in the form of a holder. As an alternative, it is conceivable for the accommodating regions 74d, 76d to be designed in the form of apertures, or in the form of convexities or the like in the movement-securing elements 24d, 26d designed in the form of holders. The extensions are designed in the form of bolts. As an alternative, it is conceivable for the extensions to be designed in the form of connecting pins, in the form of connecting stubs, or in the form of latching noses or the like. The movement-securing elements 24d, 26d designed in the form of holders are provided for accommodating the further movement-securing elements 28d, 30d, which are designed in the form of extensions, for essentially axial movement in the direction of the further movement-securing elements 28d, 30d, which are designed in the form of extensions. As an alternative, it is conceivable for the further movement-securing elements 28d, 30d, which are designed in the form of extensions, to be provided for accommodation by the movement-securing elements 24d, 26d designed in the form of holders, for essentially axial movement in the direction of the movement-securing elements 24d, 26d designed in the form of holders, or for the movement-securing elements 24d, 26d, 28d, 30d to move toward one another in each case. The movement-securing elements 24d, 26d designed in the form of holders and/or the further movement-securing elements 28d, 30d, which are designed in the form of extensions, move in particular automatically and/or without tools being required, as a result of the tool device 20d being fastened on the quick-clamping system 10d. As an alternative, it is conceivable for the movement-securing elements 24d, 26d designed in the form of holders and/or the further movement-securing elements 28d, 30d, which are designed in the form of extensions, to move as a result of automatic actuation of at least one of the movement-securing elements 24d, 26d, 28d, 30d. A respective movement-securing element 24d, 26d designed in the form of a holder and a further movement-securing element 28d, 30d, which is designed in the form of an extension, are arranged on each hook device 52d, 54d of the clamping device 18d. The movement-securing unit 22d is provided in addition to the clamping device 18d, for additionally securing the tool device 20d. However, it is also conceivable for the movement-securing unit 22d to be provided as an alternative to the clamping device 18d, for securing the tool device 20d. The movement-securing unit 22d is provided for radial and axial securing of the tool device 20d, in a state in which the tool device 20d is arranged in the quick-clamping system 10d. The movement-securing unit 22d is provided for tool-free, in particular automatic, securing of the tool device 20d.

Claims

1. A quick-clamping system for a power tool comprising:

at least one clamping device which is mounted in a movable manner on an output spindle of the power tool, said output spindle configured to be driven in rotation about an output axis of the power tool, the at least one clamping device configured to axially securing a tool device on the output spindle of the power tool; and

at least one movement-securing unit, which has at least one movement-securing element arrange on the clamping device, the at least one movement-securing element configured to move and/or secure the tool device.

2. The quick-clamping system as claimed in claim 1, wherein the at least one movement-securing element includes a holder and is configured such that, in at least one state, the at least one movement-securing element at least partially accommodates a further movement-securing element of the movement-securing unit, said further movement-securing element engaging through the tool device and including an extension.

3. The quick-clamping system at least as claimed in claim 1, wherein the at least one movement-securing unit is configured to convert a relative movement of the clamping device into a relative movement of the tool device.

4. The quick-clamping system as claimed in claim 3, wherein the at least one movement-securing element includes an oblique surface, which is configured, based on a movement of the at least one clamping device, to generate a force component which acts on the tool device along a circumferential direction.

5. The quick-clamping system as claimed in claim 3, wherein the at least one movement-securing unit includes at least one further movement-securing element arranged on the output spindle, the at least one further movement-securing element including a conical extension configured to interact with a fixing aperture of the tool device.

6. The quick-clamping system as claimed in claim 1, wherein the at least one movement-securing unit includes at least one pre-positioning element configured to pre-position the tool device prior to the tool device being secured by the at least one clamping device.

7. The quick-clamping system as claimed in claim 6, wherein the at least one pre-positioning element includes a magnet.

8. The quick-clamping system as claimed in claim 1, wherein the at least one movement-securing unit has at least one linear abutment element onto which the tool device is pushed by the at least one clamping device.

9. The quick-clamping system as claimed in claim 8, wherein the linear abutment element includes a circular ring.

10. A power tool comprising:

an output spindle configured to be driven in rotation about an output axis of the power tool; and

at least one quick-clamping system comprising: at least one clamping device which is mounted in a movable manner on the output spindle, the at least one clamping device configured to axially securing a tool device on the output spindle of the power tool; and at least one movement-securing unit, which has at least one movement-securing element arranged on the clamping device, the at least one movement-securing element configured to move and/or secure the tool device.

11. The quick-clamping system as claimed in claim 1, wherein the quick-clamping system is arranged on a hand-held power tool.

12. The quick-clamping system as claimed in claim 1, wherein the at least one clamping device is configured to axially secure an insertion tool on the output spindle.

13. The quick-clamping system as claimed in claim 1, wherein the at least one movement-securing element is configured to move the tool device into a rotary carry-along position.

14. The quick-clamping system as claimed in claim 2, wherein the extension of the further movement-securing element is configured as an axially-extending extension.

15. The power tool as claimed in claim 10, wherein the power tool is a hand-held power tool.