EP3529003B1 - Quick clamping device for a portable machine tool, in particular an angle grinder, comprising at least one output shaft that can be rotatably driven - Google Patents

Description

State of the art

Out of DE 100 17 458 A1 is already a quick-action clamping device for a portable machine tool, in particular an angle grinder, which has at least one rotationally drivable output shaft, with at least one clamping unit, which has at least one movably mounted clamping element for a tool-free fixing of an insert tool unit on the output shaft to apply a clamping force to the insert tool unit in a clamping position of the clamping element, and with at least one operating unit for moving the clamping element into the clamping position and/or into a release position of the clamping element, in which the insert tool unit is released from the clamping unit and / or the output shaft is removable, known.

From the EP 1 790 434 A1 a hand tool with a quick release device is known. The quick-release device has a hollow shaft and a bolt guided in the hollow shaft, with the hollow shaft and the bolt each forming a clamping flange. A tool disk is clamped between the clamping flanges.

The GB 2283191A shows a fixing nut for attaching a grinding wheel to an angle grinder. The fixing nut has a flange element and a threaded element for fixing the grinding wheel to a spindle of the angle grinder by means of the flange element. The flange member and the threaded member are mutually rotatable to in an abrupt deceleration Grinding wheel absorb a torque and avoid loosening the fixing nut.

From the U.S. 2,800,751A a backing plate for sandpaper is known. The backing plate has a locking mechanism for securing the abrasive paper to the backing plate.

The DE 20 2013 006 901 U1 describes in particular a quick release device according to the preamble of claim 1.

Disclosure of Invention

The invention is defined by a quick release device according to claim 1. Preferred embodiments of the invention are defined in the dependent claims.

The invention is based on a quick-action clamping device for a portable machine tool, in particular an angle grinder, which has at least one driven shaft that can be rotated, with at least one clamping unit that has at least one movably mounted clamping element for a clamping force effect on the tool insert unit in a clamping position of the clamping element for tool-free fixing of an insert tool unit on the output shaft, and with at least one operating unit for moving the clamping element into the clamping position and/or into a release position of the Clamping element in which the application tool unit can be removed from the clamping unit and/or the output shaft.

It is proposed that the quick-action clamping device comprises at least one safety unit designed as a self-locking unit, which is intended to prevent a movement of the clamping element, starting from the clamping position into the release position of the clamping element, in particular with the exception of tolerance- and/or play-related movements of the clamping element, at least when a force acts on the clamping element that is decoupled from the operating unit and acts in the direction of the release position of the clamping element. “Provided” should be understood to mean, in particular, specially programmed, designed and/or equipped. The fact that an element and/or a unit is provided for a specific function is to be understood in particular to mean that the element and/or the unit fulfills/fulfils and/or performs/executes this specific function in at least one application and/or operating state. "Movably mounted" is to be understood in particular as a mounting of an element and/or a unit, with the element and/or the unit being able to move, in particular decoupled from an elastic deformation of the element and/or the unit, along an axis of movement of more than 5 mm, preferably of more than 10 mm and particularly preferably of more than 50 mm and/or around a movement axis along an angular range of more than 1°, preferably of more than 5° and particularly preferably of more than 15°. The securing unit, in particular the self-locking unit and/or the latching unit, is preferably provided for the purpose of securing the clamping element, starting from the clamping position, as far as possible against movement into the release position of the clamping element, at least when a force acts on the clamping element that is decoupled from the operating unit and acts in the direction of the release position of the clamping element. The expression "to secure as far as possible against movement" is intended to be understood in particular as securing an element, in particular in one position of the element, against movement, with a tolerance- and/or play-related movement of the element in a secured position on of the element can be done. In the secured position of the clamping element, there is preferably a positive connection between the clamping element and the insertion tool unit secured, in particular to avoid accidental release of the application tool unit from the clamping unit. The clamping element can preferably be secured by the securing unit in the clamping position by means of a form-fitting and/or non-positive connection in the clamping position against movement into the release position of the clamping element.

The clamping element can preferably be moved into the clamping position and/or into the release position by means of a mechanical connection between at least one operating element of the operating unit and the clamping element by means of the operating unit. The operating element is preferably designed as an operating lever, in particular as a pivoted operating lever. However, it is also conceivable for an operating element of the operating unit to be able to generate an electrical signal which can be used to control an actuator which is intended to move the clamping element into the clamping position and/or into the release position. The operating unit can be embodied as a mechanical, electrical and/or electronic operating unit, which is intended to move the clamping element into the clamping position and/or into the release position as a result of an operating command from an operator and/or an operator force from an operator.

The tensioning element is preferably arranged at least partially in the output shaft. The output shaft preferably surrounds the tensioning element at least partially, in particular completely, along a circumferential direction that runs around an axis of rotation of the output shaft. The clamping element is preferably connected to the output shaft in a rotationally fixed manner. The tensioning element is preferably mounted pivotably about a pivot axis of the tensioning element. The pivot axis of the clamping element preferably runs transversely, in particular at least essentially perpendicularly, to the axis of rotation of the output shaft. The pivot axis of the tensioning element preferably runs at least essentially perpendicularly to a tensioning axis of the tensioning unit. A "clamping axis" is to be understood here in particular as an axis of the clamping unit, along which an axial securing force of the clamping unit can be exerted on the insert tool unit to fix the insert tool unit on the output shaft and/or along which a transmission element of the clamping unit is movably mounted to move the clamping element. Under "at least essentially perpendicular" is intended in particular to define an alignment of a direction relative to a reference direction, with the direction and the reference direction, in particular viewed in one plane, enclosing 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 clamping element is preferably designed as a clamping jaw , in particular in a fixing recess of the insert tool unit. The clamping element preferably engages behind a clamping extension of the insert tool unit, at least when the insert tool unit is fixed by means of the clamping unit. The securing unit is preferably provided at least to prevent a pivoting movement of the clamping element starting from the clamping position of the clamping element at least as far as possible, in particular except for a pivoting movement caused by tolerance and/or play, against a pivoting movement of the clamping element into the release position. The security unit can be designed as a magnetic security unit, as a mechanical security unit, as an electronic security unit or the like. In an embodiment of the security unit as a magnetic security unit, it is conceivable that the security unit comprises at least one magnetic element, which secures the tensioning element in the tensioned position by means of the action of a magnetic force. In an embodiment of the safety unit as a mechanical safety unit, it is conceivable that the safety unit comprises at least one mechanical safety element, which secures the tensioning element in the tensioned position by means of a positive and/or non-positive connection. In one configuration of the security unit as an electronic security unit, it is conceivable that the security unit comprises at least one electronic element that secures the clamping element in the clamping position and/or that monitors a position of the clamping element and, when the clamping position is reached, controls an actuator that secures the clamping element in the clamping position. Other configurations of the security unit that appear sensible to a person skilled in the art are also conceivable.

The clamping unit preferably comprises at least two movably, in particular pivotably, mounted clamping elements. However, it is also conceivable that the clamping unit comprises a different number of clamping elements than two. The at least two tensioning elements preferably have an at least essentially analogous configuration. The at least two tensioning elements of the tensioning unit are preferably mounted such that they can be moved relative to one another, in particular pivoted relative to one another. In particular, the at least two clamping elements can be moved into a clamping position of the clamping elements and/or into a release position of the clamping elements by means of the operating unit. The at least two clamping elements can preferably be moved together by means of the operating unit, in particular can be moved together into the clamping position and/or into the release position. However, it is also conceivable that the at least two clamping elements can be moved into the clamping position and/or into the release position independently of one another by means of the operating unit.

A high degree of operator safety can advantageously be achieved by means of the configuration of the quick-action clamping device according to the invention. Advantageously, an unintentional transfer of the clamping element from the clamping position into the release position can be prevented at least as far as possible. Advantageously, unintentional detachment of the insertion tool unit from the clamping unit can be counteracted. Advantageously, the insert tool unit can be fixed reliably and securely to the clamping unit and/or to the output shaft of the portable power tool.

It is also proposed that the securing unit has at least one movably mounted positive and/or non-positive locking element which, at least in the clamping position of the clamping element, engages at least partially in the clamping element and/or in a transmission element of the clamping unit that interacts with the clamping element to secure the clamping element against movement into the release position of the clamping element. The positive and/or non-positive locking element can be designed as a locking element, in particular a spring-loaded locking element, which engages in the tensioning element and/or the transmission element at least in the tensioned position, or the positive and/or non-positive locking element can be used as a link engagement element, in particular as a tensioning bolt, be formed, which engages in a movement of the clamping unit, which is arranged in particular on the clamping element. Other configurations of the form-locking and/or non-positive locking element that appear sensible to a person skilled in the art are also conceivable. The transmission element is preferably designed as a clamping fork. The transmission element is preferably movable, in particular movable in translation, mounted in the output shaft. The tensioning unit preferably has at least one spring element, which applies a spring force to the transmission element in the direction of the operating unit, in particular in the direction of the tensioning position of the tensioning element. The spring element is preferably arranged in the output shaft. The transmission element is preferably connected to the output shaft in a torque-proof manner. A high degree of operator safety can advantageously be achieved by means of the configuration of the quick-action clamping device according to the invention. Advantageously, an unintentional transfer of the clamping element from the clamping position into the release position can be prevented at least as far as possible. Advantageously, unintentional detachment of the insertion tool unit from the clamping unit can be counteracted. Advantageously, the insert tool unit can be fixed reliably and securely to the clamping unit and/or to the output shaft of the portable power tool. Advantageously, the clamping element can be reliably secured against unintentional movement into the release position in a structurally simple manner.

It is also proposed that the securing unit has at least one movably mounted positive and/or non-positive locking element which, at least in the clamping position of the clamping element, bears against the clamping element in such a way that a main securing force can be exerted on the clamping element along a direction running at least essentially parallel or at least essentially perpendicular to a clamping axis of the clamping unit, which counteracts a movement of the clamping element into the release position, in particular at least when a force acts that is decoupled from the operating unit and acts in the direction of the release position of the clamping element. The main securing force can preferably be exerted on the clamping element by means of a positive and/or non-positive connection between the positive and/or non-positive connection element and the tensioning element and/or the transmission element. A main direction of action of the main securing force is preferred in one embodiment of the Positive and / or force-fitting element aligned as a link engagement element at least substantially perpendicular to the clamping axis. A main effective direction of the main securing force is preferably aligned at least essentially parallel to the clamping axis and in the direction of the clamping position when the positive and/or non-positive locking element is designed as a locking element. A "main securing force" is to be understood in particular as a force component of a reaction force with the greatest magnitude of two force components of the reaction force and/or a force acting along a single direction. The main securing force preferably acts in such a way that no or only small force components act on the transmission element along the clamping axis. It can advantageously be achieved that the link engagement element cannot move into a release contour of the link element, in particular the link guide track. A high degree of operator safety can advantageously be achieved by means of the configuration of the quick-action clamping device according to the invention. Advantageously, an unintentional transfer of the clamping element from the clamping position into the release position can be prevented at least as far as possible. Advantageously, unintentional detachment of the insertion tool unit from the clamping unit can be counteracted. Advantageously, the insert tool unit can be fixed reliably and securely to the clamping unit and/or to the output shaft of the portable machine tool. Advantageously, the clamping element can be reliably secured against unintentional movement into the release position in a structurally simple manner.

In addition, it is proposed that the safety unit is designed at least partially in one piece with the tensioning unit, with the safety unit having at least one self-locking contour arranged on the tensioning element. The fact that "a unit is formed at least partially in one piece with a further unit" is to be understood in particular to mean that the unit and the further unit have at least one common component. The self-locking contour is preferably formed in one piece with the tensioning element. “In one piece” is to be understood in particular as being at least cohesively connected, for example by a welding process, an adhesive process, an injection molding process and/or another process that appears sensible to a person skilled in the art, and/or advantageously formed in one piece, such as for example by being produced from a single casting and/or by being produced using a one-component or multi-component injection molding process and advantageously from a single blank. However, it is also conceivable that the self-locking contour is formed separately from the tensioning element and is fixed to the tensioning element by means of a positive and/or non-positive connection. The self-locking contour is preferably part of a link element of the tensioning unit, in particular a link guide track which is arranged on the tensioning element. The link element, in particular the link guideway, is preferably provided for moving the clamping element into the tensioned position and/or into the release position, in particular by means of an interaction of the positive and/or non-positive locking element, which engages in the link element, in particular in the link guideway. A high degree of operator safety can advantageously be achieved by means of the configuration of the quick-action clamping device according to the invention. Advantageously, an unintentional transfer of the clamping element from the clamping position into the release position can be prevented at least as far as possible. Advantageously, unintentional detachment of the insertion tool unit from the clamping unit can be counteracted. Advantageously, the insert tool unit can be fixed reliably and securely to the clamping unit and/or to the output shaft of the portable machine tool. Advantageously, the clamping element can be reliably secured against unintentional movement into the release position in a structurally simple manner. A particularly compact configuration of the tensioning unit and/or the securing unit can advantageously be implemented.

Furthermore, it is proposed that the self-locking contour be aligned in the clamping position of the clamping element in such a way that, when a force acts on the clamping element that is decoupled from the operating unit and acts in the direction of the release position of the clamping element, a main securing force can be exerted on the clamping element at least by means of the self-locking contour, said main securing force running at least essentially perpendicular to a clamping axis of the clamping unit. The self-locking contour is preferably mounted such that it can move, in particular pivot, together with the tensioning element. Preferably, in the tightening position of the tightening element, an action is taken that is decoupled from the operating unit and moves in the direction of the loosening position of the tightening element force acting on the clamping element by means of a cooperation of the positive and/or non-positive locking element and the self-locking contour, a main securing force can be exerted on the clamping element, which runs at least essentially perpendicularly to a clamping axis of the clamping unit. A high degree of operator safety can advantageously be achieved by means of the configuration of the quick-action clamping device according to the invention. Advantageously, an unintentional transfer of the clamping element from the clamping position into the release position can be prevented at least as far as possible. Advantageously, unintentional detachment of the insertion tool unit from the clamping unit can be counteracted. Advantageously, the insert tool unit can be fixed reliably and securely to the clamping unit and/or to the output shaft of the portable power tool. Advantageously, the clamping element can be reliably secured against unintentional movement into the release position in a structurally simple manner. A securing force can advantageously be generated which at least largely prevents an unintentional movement of the clamping element from the clamping position into the release position of the clamping element.

It is also proposed that the self-locking contour, in particular a contact surface of the self-locking contour for contact with the positive and/or non-positive locking element, encloses an angle of less than 40° with a clamping axis of the clamping unit, at least in the clamping position of the clamping element, in particular in a plane which runs at least essentially parallel to the clamping axis and at least essentially perpendicular to the pivot axis of the clamping element. "At least essentially parallel" is to be understood here in particular as an orientation of a direction relative to a reference direction, in particular in a plane, with the direction relative to the reference direction deviating in particular by less than 8°, advantageously less than 5° and particularly advantageously less than 2°. At least in the clamping position of the clamping element, the self-locking contour preferably encloses an angle with the clamping axis of the clamping unit that is in particular smaller than 30°, preferably smaller than 20° and particularly preferably smaller than 10°. A high degree of operator safety can advantageously be achieved by means of the configuration of the quick-action clamping device according to the invention. It can be advantageous for an unintentional transfer of the tensioning element starting from the clamping position in the release position are at least largely prevented. Advantageously, unintentional detachment of the insertion tool unit from the clamping unit can be counteracted. Advantageously, the insert tool unit can be fixed reliably and securely to the clamping unit and/or to the output shaft of the portable machine tool. Advantageously, the clamping element can be reliably secured against unintentional movement into the release position in a structurally simple manner. It can be made possible in a structurally simple manner that at least in the clamping position and when a force acts on the clamping element that is decoupled from the operating unit and acts in the direction of the release position of the clamping element, a securing force can be exerted on the clamping element that runs at least essentially perpendicularly to the clamping axis of the clamping unit, in particular by means of an interaction of the self-locking contour and the positive and/or non-positive locking element that rests on the self-locking contour.

In addition, it is proposed that the self-locking contour has at least one contact surface which, in the clamping position of the clamping element, runs at least essentially parallel to a clamping axis of the clamping unit. The contact surface of the self-locking contour is preferably in contact with the positive and/or non-positive locking element at least in the clamping position of the clamping element. A high degree of operator safety can advantageously be achieved by means of the configuration of the quick-action clamping device according to the invention. Advantageously, an unintentional transfer of the clamping element from the clamping position into the release position can be prevented at least as far as possible. Advantageously, unintentional detachment of the insertion tool unit from the clamping unit can be counteracted. Advantageously, the insert tool unit can be fixed reliably and securely to the clamping unit and/or to the output shaft of the portable machine tool. Advantageously, the clamping element can be reliably secured against unintentional movement into the release position in a structurally simple manner. It can be made possible in a structurally simple manner that at least in the clamping position and when a force that is decoupled from the operating unit and acts in the direction of the release position of the clamping element acts on the clamping element, a securing force can be exerted on the clamping element at least substantially perpendicular to the clamping axis of the clamping unit, in particular by means of an interaction of the self-locking contour and the positive and/or non-positive locking element that rests on the self-locking contour.

Furthermore, it is proposed that the self-locking contour is arranged in a transition area between a clamping contour and a release contour of a link element of the clamping unit. The clamping contour, the release contour and the self-locking contour are preferably formed in one piece with the link element, in particular the link guide track. The clamping contour, the release contour and the self-locking contour preferably form a guideway of the link element, which is provided for moving the clamping element into the clamping position and/or the release position, in particular by means of an interaction with the positive and/or non-positive locking element, in particular the positive and/or non-positive locking element designed as a clamping bolt. A high degree of operator safety can advantageously be achieved by means of the configuration of the quick-action clamping device according to the invention. Advantageously, an unintentional transfer of the clamping element from the clamping position into the release position can be prevented at least as far as possible. Advantageously, unintentional detachment of the insertion tool unit from the clamping unit can be counteracted. Advantageously, the insert tool unit can be fixed reliably and securely to the clamping unit and/or to the output shaft of the portable machine tool. Advantageously, a reliable securing of the tensioning element against unintentional movement into the release position can be realized in a structurally simple manner. A compact configuration of the security unit can advantageously be implemented. The securing unit can be integrated into the tensioning unit in a structurally simple manner.

It is also proposed that the securing unit comprises at least one spring element which applies a spring force in the direction of the tensioning element to at least one movably mounted positive and/or non-positive locking element of the securing unit. The positive and/or non-positive locking element is preferably designed as a latching element which is provided for this purpose, at least in the clamping position in the clamping element and/or in the transmission element to intervene The spring element is preferably designed as a compression spring, in particular as a helical compression spring. It is also conceivable, however, for the spring element to be in the form of a tension spring, a torsion spring or another spring element that a person skilled in the art deems appropriate. The spring element is preferably supported with one end on the positive and/or non-positive connection element and with another end the spring element is supported on the output shaft, in particular on an inside of the output shaft, or on an intermediate element arranged between the tensioning element and the output shaft. A high degree of operator safety can advantageously be achieved by means of the configuration of the quick-action clamping device according to the invention. Advantageously, an unintentional transfer of the clamping element from the clamping position into the release position can be prevented at least as far as possible. Advantageously, unintentional detachment of the insertion tool unit from the clamping unit can be counteracted. Advantageously, the insert tool unit can be fixed reliably and securely to the clamping unit and/or to the output shaft of the portable power tool. Advantageously, the clamping element can be reliably secured against unintentional movement into the release position in a structurally simple manner. Advantageously, an independent movement of the positive and/or non-positive locking element into a securing position can be implemented.

In addition, it is proposed that the positive and/or non-positive locking element can be moved by means of the operating unit against a spring force of the spring element. Preferably, the positive and/or non-positive locking element, in particular when configured as a latching element, can be moved against a spring force of the spring element when the clamping element is transferred from the clamped position to the release position, in particular to release a possibility of movement of the clamping element. The positive and/or non-positive locking element, in particular the latching element, is preferably mounted so that it can move in a translatory manner, in particular along a movement axis running at least substantially perpendicularly to the clamping axis. However, it is also conceivable that the positive and/or non-positive locking element, in particular the latching element, is pivotably mounted in an alternative embodiment of the tensioning unit. By means of the inventive design of the quick release device can be advantageous a high level of operator safety can be achieved. Advantageously, an unintentional transfer of the clamping element from the clamping position into the release position can be prevented at least as far as possible. Advantageously, unintentional detachment of the insertion tool unit from the clamping unit can be counteracted. Advantageously, the insert tool unit can be fixed reliably and securely to the clamping unit and/or to the output shaft of the portable power tool. Advantageously, the clamping element can be reliably secured against unintentional movement into the release position in a structurally simple manner.

Furthermore, it is proposed that the clamping element comprises at least one securing recess, in which the positive and/or non-positive locking element, in particular the latching element, engages at least partially in the clamping position of the clamping element. Preferably, the positive and/or non-positive locking element, in particular the latching element, can be moved at least partially into the securing recess of the clamping element in the clamped position by means of a spring force of the spring element. However, it is also conceivable for the safety unit to have an electric, magnetic or hydraulic actuator which is intended to move the positive and/or non-positive locking element, in particular the latching element, at least partially into the safety recess of the clamping element when the clamping element is in the clamping position. Other technical options for moving the positive and/or non-positive locking element, in particular the latching element, into the securing recess that appear sensible to a person skilled in the art are also conceivable. A high degree of operator safety can advantageously be achieved by means of the configuration of the quick-action clamping device according to the invention. Advantageously, an unintentional transfer of the clamping element from the clamping position into the release position can be prevented at least as far as possible. Advantageously, unintentional detachment of the insertion tool unit from the clamping unit can be counteracted. Advantageously, the insert tool unit can be fixed reliably and securely to the clamping unit and/or to the output shaft of the portable machine tool. Advantageously, the clamping element can be reliably secured against unintentional movement into the release position in a structurally simple manner.

It is also proposed that the securing unit, in particular in an alternative configuration of the securing unit, has at least one positive and/or non-positive locking element which can be moved by centrifugal force into a securing position of the positive and/or non-positive locking element in which the tensioning element, starting from the tensioned position, is largely secured against movement into the release position of the tensioning element. A high degree of operator safety can advantageously be achieved by means of the configuration of the quick-action clamping device according to the invention. Advantageously, an unintentional transfer of the clamping element from the clamping position into the release position can be prevented at least as far as possible. Advantageously, unintentional detachment of the insertion tool unit from the clamping unit can be counteracted. Advantageously, the insert tool unit can be fixed reliably and securely to the clamping unit and/or to the output shaft of the portable power tool. Advantageously, the clamping element can be reliably secured against unintentional movement into the release position in a structurally simple manner. It can advantageously be ensured that, in particular when the portable machine tool is in operation, unintentional detachment of the insertion tool unit from the clamping unit and/or from the output shaft can be avoided.

In addition, it is proposed that the security unit has at least one output element which is provided to output at least one functional state of the security unit to an operator. The output element can be in the form of a mechanical element, an electronic element or an electrical element. The output element is preferably provided to output a functional state of the security unit to an operator haptically, acoustically and/or optically. The functional state of the safety unit preferably describes a state of the safety unit, such as a safety of the tensioning element, a released state in which the tensioning element is unsecured, a defect in the safety unit or other states of the safety unit that appear reasonable to a person skilled in the art. The output element can be designed as a display, as a single light source, such as an LED, as a mechanically movable display element, as a loudspeaker or the like. A high degree of operator safety can advantageously be achieved by means of the configuration of the quick-action clamping device according to the invention become. Advantageously, an unintentional transfer of the clamping element from the clamping position into the release position can be prevented at least as far as possible. Advantageously, unintentional detachment of the insertion tool unit from the clamping unit can be counteracted. Advantageously, the insert tool unit can be fixed reliably and securely to the clamping unit and/or to the output shaft of the portable machine tool. Advantageously, the clamping element can be reliably secured against unintentional movement into the release position in a structurally simple manner. It can advantageously be signaled to an operator whether the tensioning element is reliably secured by means of the security unit or whether the security unit is defective.

Furthermore, a portable machine tool, in particular an angle grinder, with a quick-action clamping device according to the invention is proposed. A "portable machine tool" is to be understood here in particular as a machine tool for machining workpieces, which can be transported by an operator without a transport machine. In particular, the portable machine tool has a mass that is less than 40 kg, preferably less than 10 kg and particularly preferably less than 5 kg. The portable machine tool is particularly preferably designed as an angle grinder. However, it is also conceivable for the portable power tool to have a different design that would appear sensible to a person skilled in the art, such as a design as a circular saw machine, a grinding machine or the like. The portable power tool preferably includes a driven shaft that can be driven in rotation. The quick-action clamping device is preferably arranged on the output shaft. The quick-action clamping device is preferably arranged at least partially in the output shaft. The output shaft is preferably designed as a hollow shaft. In particular, the portable machine tool forms a machine tool system together with an insert tool unit that can be fixed to the output shaft by means of the quick-action clamping device. A high degree of operator safety can advantageously be made possible by means of the configuration according to the invention. It can advantageously be ensured that the quick-action clamping device, in particular the clamping element of the clamping unit of the quick-action clamping device, is unintentionally transferred into a release position. It can be beneficial an unintentional Loosening the application tool unit can be avoided by the quick release device. A safe, portable machine tool can advantageously be implemented.

The quick-release device according to the invention and/or the portable machine tool according to the invention should/should not be limited to the application and embodiment described above. In particular, the quick-action clamping device according to the invention and/or the portable power tool according to the invention can/can have a number of individual elements, components and units as well as method steps that differs from the number specified here in order to fulfill a function described herein. In addition, in the value ranges specified in this disclosure, values lying within the specified limits should also be considered disclosed and can be used as desired.

drawing

Further advantages result from the following description of the drawings. Exemplary embodiments of the invention are shown in the drawing.

Fig. 1

eine erfindungsgemäße tragbare Werkzeugmaschine mit einer erfindungsgemäßen Schnellspannvorrichtung in einer schematischen Darstellung,

Fig. 2

eine Schnittansicht der erfindungsgemäßen tragbaren Werkzeugmaschine und der erfindungsgemäßen Schnellspannvorrichtung in einer schematischen Darstellung,

Fig. 3

eine Detailansicht einer Sicherungseinheit der erfindungsgemäßen Schnellspannvorrichtung in einer schematischen Darstellung und

Fig. 4

eine Schnittansicht einer alternativen erfindungsgemäßen tragbaren Werkzeugmaschine und einer alternativen erfindungsgemäßen Schnellspannvorrichtung mit einer alternativen Sicherungseinheit in einer schematischen Darstellung.

Show it:

1

a portable machine tool according to the invention with a quick-action clamping device according to the invention in a schematic representation,

2

a sectional view of the portable machine tool according to the invention and the quick-release device according to the invention in a schematic representation,

3

a detailed view of a safety unit of the quick release device according to the invention in a schematic representation and

4

a sectional view of an alternative portable machine tool according to the invention and an alternative quick-action clamping device according to the invention with an alternative safety unit in a schematic representation.

Description of the exemplary embodiments

figure 1 shows a portable machine tool 14a designed as an angle grinder with a quick-action clamping device 10a. However, it is also conceivable for the portable machine tool 14a to have another configuration that would appear sensible to a person skilled in the art, such as a configuration as a circular saw, a grinding machine or the like. The portable machine tool 14a includes a gear housing 62a for receiving and/or supporting a gear unit 64a of the portable machine tool 14a. Gear housing 62a is preferably formed from a metallic material. However, it is also conceivable for the gear housing 62a to be made of another material that a person skilled in the art considers appropriate, such as plastic or the like. The gear unit 64a is preferably designed as an angular gear. The transmission unit 64a includes in particular a rotationally drivable output shaft 12a to which an insert tool unit 18a can be fixed, in particular by means of the quick-action clamping device 10a. The output shaft 12a is preferably designed as a hollow spindle, in which the quick-action clamping device 10a is at least partially arranged ( figure 2 ). A protective hood unit, not shown in detail here, can be arranged on the gear housing 62a in a manner already known to a person skilled in the art. An additional handle, not shown in detail here, can be arranged on the transmission housing 62a in a manner already known to a person skilled in the art. The portable power tool 14a includes a motor housing 66a for receiving and/or supporting a drive unit 68a of the portable power tool 14a. The drive unit 68a is preferably provided in a manner already known to a person skilled in the art to drive the output shaft 12a rotating about a rotational axis 70a of the output shaft 12a by means of cooperation with the transmission unit 64a. The axis of rotation 70a of the output shaft 12a runs at least substantially perpendicular to a drive axis 96a of the drive unit 68a. The drive unit 68a is preferably designed as an electric motor unit. However, it is also conceivable for the drive unit 68a to have a different design that would appear sensible to a person skilled in the art, such as a design as a combustion drive unit, as a hybrid drive unit, as a pneumatic drive unit or the like.

figure 2 shows a sectional view of the portable machine tool 14a, in particular in the area of the gear housing 62a, and the quick-action clamping device 10a. The high -speed device 10a for the portable power tool 14a, which is at least the rotating draft shaft 12a, at least includes a clamping unit 16a, which, to a tool -free fixation of the operating tool unit 18a on the output shaft 12a, at least a movable tensioning element 20a, 22a in a clamping power unit 18a in a clamping position of the clamping position 20a, 22a, 22a. Furthermore, the quick-action clamping device 10a comprises at least one operating unit 24a for moving the clamping element 20a, 22a into the clamping position and/or into a release position of the clamping element 20a, 22a, in which the insertion tool unit 18a can be removed from the clamping unit 16a and/or the output shaft 12a. The clamping unit 16a comprises at least two movably mounted clamping elements 20a, 22a. However, it is also conceivable that the clamping unit 16a comprises a number of clamping elements 20a, 22a that differs from two. The at least two clamping elements 20a, 22a have an at least essentially analogous configuration, so that features that are disclosed for one of the clamping elements 20a, 22a are also to be regarded as disclosed for the other clamping element 20a, 22a. The at least two clamping elements 20a, 22a are pivotably mounted. A pivot axis 72a of the at least two clamping elements 20a, 22a runs at least substantially perpendicular to the axis of rotation 70a of the output shaft 12a. The at least two clamping elements 20a, 22a are intended to fix the insertion tool unit 18a axially on the output shaft 12a when it is arranged on the clamping unit 16a and/or the output shaft 12a, in particular in the clamping position of the at least two clamping elements 20a, 22a. The at least two tensioning elements 20a, 22a are connected in a torque-proof manner to the output shaft 12a. The at least two clamping elements 20a, 22a can be driven together with the output shaft 12a in rotation about the axis of rotation 70a.

The clamping unit 16a comprises at least one rotary driver element 74a for torque transmission to the insertion tool unit 18a. When the tool insert unit 18a is arranged on the clamping unit 16a and/or the output shaft 12a, the rotary driver element 74a engages in a receiving recess (not shown in detail here) of the tool insert unit 18a and rests against at least one edge of the insertion tool unit 18a that delimits the receiving recess for torque transmission. Torque is preferably transmitted between the output shaft 12a and the tool insert unit 18a arranged on the clamping unit 16a and/or the output shaft 12a in a manner already known to a person skilled in the art by means of a positive connection between the rotary driver element 74a and the tool insert unit 18a. The rotary driver element 74a is arranged in a rotationally fixed manner on the output shaft 12a. The rotary driver element 74a can be driven together with the output shaft 12a to rotate about the axis of rotation 70a.

Operating unit 24a is preferably provided to move clamping element 20a, 22a, in particular the at least two clamping elements 20a, 22a, at least into the release position in which insert tool unit 18a can be removed from clamping unit 16a and/or output shaft 12a. Alternatively or additionally, it is conceivable that operating unit 24a is provided to move clamping element 20a, 22a, in particular the at least two clamping elements 20a, 22a, at least into the clamping position in which insert tool unit 18a can be fixed on output shaft 12a by means of clamping unit 16a. The operating unit 24a preferably includes at least one operating element 76a, which can be actuated by an operator. The operating element 76a is designed as an operating lever. The operating element 76a comprises a movement axis 78a, in particular a pivot axis, which runs transversely, in particular at least essentially perpendicularly, to the axis of rotation 70a of the output shaft 12a. The operating element 76a is preferably pivotably mounted about the movement axis 78a, in particular the pivot axis. The operating element 76a is decoupled from a rotational movement of the output shaft 12a. The operating element 76a includes an eccentric section 80a for actuating an operating element 82a of the operating unit 24a. The actuating element 82a is mounted in a translationally movable manner along the axis of rotation 70a, in particular in the output shaft 12a and/or in the gear housing 62a. The actuating element 82a is fixed against rotation relative to the gear housing 62a in the gear housing 62a, in particular as a result of at least one lateral flattening of the actuating element 82a, which enables an axial movement and prevents a rotational movement. In the area of the actuating element 82a is preferably a sealing element 84a, such as a rubber seal or the like, is arranged, in particular in order to at least largely prevent dirt from penetrating into the transmission housing 62a and/or into the tensioning unit 16a.

The operating unit 24a comprises at least one decoupling element 86a, which can be brought into contact with the actuating element 82a by means of a non-positive connection or is in contact with the actuating element 82a. The decoupling element 86a is preferably movably mounted in a translatory manner along the axis of rotation 70a, in particular in the output shaft 12a or in a transmission element 36a of the clamping unit 16a. The decoupling element 86a includes in particular a conical connection area which at least partially engages in a recess of the actuating element 82a. A frictional effect between the actuating element 82a and the decoupling element 86a is dependent in particular on a configuration of the conical connection area and a spring force of a decoupling spring element 90a of the operating unit 24a. The decoupling spring element 90a is intended to act on the decoupling element 86a with a spring force in the direction of the actuating element 82a. The decoupling spring element 90a is arranged in the transmission element 36a of the clamping unit 16a. The transmission element 36a is designed as a clamping fork. The transmission element 36a is rotatably connected to the output shaft 12a. The transmission element 36a can be moved translationally along a clamping axis 40a of the clamping unit 16a. The transmission element 36a is movably mounted in the output shaft 12a. The transmission element 36a can be subjected to a spring force at least by means of a tensioning spring element 88a of the tensioning unit 16a along the tensioning axis 40a, in particular in the direction of the operating unit 24a.

The operating unit 24a has at least one connecting element 92a, which is provided to connect the decoupling element 86a and the transmission element 36a to one another in terms of movement, in particular at least when the output shaft 12a is in a state with a low speed or when the output shaft 12a is at a standstill. The connecting element 92a is designed as a bolt. The connecting element 92a is on the decoupling element 86a fixed. The connecting element 92a can be moved together with the decoupling element 86a. The connecting element 92a extends into a guide slot (not shown in detail here) of the transmission element 36a. In the case of a rotation movement of the output shaft 12a, the decoupling element 86a and the connecting element 92a as a result of a braking by actuation of the activation element 82a is rotatable in relation to the transmission element 36a, whereby the connecting element 92a in the guide backdrop can be moved in this way that the degradation element 86a is against a comprehensive strength of the decoupling spring 90a in a guide recess 94a of the transmission element 36a is movable. An actuation of the operating element 76a during a rotational movement of the output shaft 12a can be converted into a movement of the actuating element 82a and the decoupling element 86a relative to the transmission element 36a. A movement of the transmission element 36a as a result of the action of an operator force by means of the operating unit 24a to transfer the clamping element 20a, 22a, in particular the clamping elements 20a, 22a, starting from the clamping position into the release position during a rotary movement of the output shaft 12a can be prevented as far as possible. When output shaft 12a is rotating slowly or when output shaft 12a is at a standstill, an axial force acting from actuating element 82a on decoupling element 86a can be transmitted to transmission element 36a by means of interaction between connecting element 92a and the guide link. The transmission element 36a can be moved by means of the operating unit 24a against a spring force of the tension spring element 88a. The transmission element 36a is provided to move the clamping element 20a, 22a, in particular the clamping elements 20a, 22a, starting from the clamping position into the release position.

The tensioning element 20a, 22a, in particular the tensioning elements 20a, 22a, is/are movably, in particular pivotably, mounted on the output shaft 12a, in particular in the output shaft 12a. The pivot axis 72a of the clamping element 20a, 22a, in particular of the clamping elements 20a, 22a, preferably runs at least substantially perpendicularly to the clamping axis 40a of the clamping unit 16a. The clamping element 20a, 22a, in particular the clamping elements 20a, 22a, has/have at least one link element 50a, which is intended to interact with a link engagement element. The link engagement element is fixed to the transmission element 36a. As a result of an interaction of the link engagement element and the link element 50a, the clamping element 20a, 22a, in particular the clamping elements 20a, 22a, can be moved from the clamped position into the release position or from the release position into the clamped position. The clamping element 20a, 22a, in particular the clamping elements 20a, 22a, is/are movable from the release position into the clamping position, in particular by means of an action of a spring force of the clamping spring element 88a on the transmission element 36a. The clamping element 20a, 22a, in particular the clamping elements 20a, 22a, is/are automatically movable into the clamping position, in particular after the action of an operator force has been removed via the operating unit 24a, as a result of the action of a spring force of the clamping spring element 88a.

The quick-action clamping device 10a comprises at least one safety unit 26a, in particular a self-locking unit and/or a latching unit, which is provided for the purpose of causing a movement, at least when a force acts on the clamping element 20a, 22a, in particular on the clamping elements 20a, 22a, which is decoupled from the operating unit 24a and acts in the direction of the release position of the clamping element 20a, 22a, in particular the clamping elements 20a, 22a of the clamping element 20a, 22a, in particular the clamping elements 20a, 22a, starting from the clamping position into the release position of the clamping element 20a, 22a, in particular the clamping elements 20a, 22a. Securing unit 26a has at least one movably mounted positive and/or non-positive locking element 28a, 30a, 32a, 34a, which, at least in the clamping position of clamping element 20a, 22a, in particular clamping elements 20a, 22a, is used to secure clamping element 20a, 22a, in particular clamping elements 20a, 22a, against movement into the release position of clamping element 20a , 22a, in particular of the clamping elements 20a, 22a, engages at least partially in the clamping element 20a, 22a, in particular in the clamping elements 20a, 22a, and/or in the transmission element 36a of the clamping unit 16a that interacts with the clamping element 20a, 22a, in particular with the clamping elements 20a, 22a. The positive and/or non-positive locking element 28a is designed as the link engagement element (cf. figures 2 and 3 ). The positive and/or non-positive locking element 28a is designed as a bolt which is fixed to the transmission element 36a, in particular between two fork ends of the transmission element 36a. Alternatively or additionally, the safety unit 26a comprises at least one further form and/or frictional element 30a, 32a, which is designed as a latching element and which is intended to engage in the clamping element 20a, 22a, in particular in the clamping position of the clamping element 20a, 22a. Securing unit 26a preferably alternatively or additionally comprises at least two further positive and/or non-positive locking elements 30a, 32a designed as latching elements, one of which engages in one of the clamping elements 20a, 22a, in particular in the clamping position of clamping elements 20a, 22a. The other positive and/or non-positive locking elements 30a, 32a are designed as movably mounted latching elements. The other positive and/or non-positive locking elements 30a, 32a are mounted so that they can move, in particular move in a translatory manner, along a direction running at least substantially perpendicularly to the axis of rotation 70a and/or to the clamping axis 40a. The axis of rotation 70a and the clamping axis 40a preferably run at least substantially parallel, in particular coaxially, to one another. Securing unit 26a preferably alternatively or additionally comprises an additional positive and/or non-positive locking element 34a, which is intended to engage in transmission element 36a, in particular in a clamping position of clamping elements 20a, 22a and/or in an end position of transmission element 36a moved by means of a spring force of clamping spring element 88a. The additional positive and/or non-positive locking element 34a is designed as a movably mounted latching element. The additional positive and/or non-positive locking element 34a is mounted so that it can move, in particular move in a translatory manner, along a direction running at least substantially perpendicularly to the axis of rotation 70a and/or to the clamping axis 40a.

Securing unit 26a has at least the movably mounted positive and/or non-positive locking element 28a, 30a, 32a, in particular the positive and/or non-positive locking element 28a designed as a slotted link engagement element and/or the additional positive and/or non-positive locking elements 28a designed as latching elements, which, at least in the tensioned position of the tensioning element 20a, 22a, in particular the tensioning elements 20a, 22a, such on the clamping element 20a, 22a, in particular on the clamping elements 20a, 22a, that a main securing force 38a (cf. figure 3 ) can be exerted on the clamping element 20a, 22a, in particular the clamping elements 20a, 22a, along a direction running at least substantially parallel or at least substantially perpendicular to the clamping axis 40a of the clamping unit 16a, which corresponds to a movement of the Clamping element 20a, 22a, in particular the clamping elements 20a, 22a counteracts in the release position. The main securing force 38a preferably acts in such a way that no or only small force components act on the transmission element 36a along the clamping axis 40a. It can advantageously be achieved that the link engagement element cannot move into a release contour 48a of the link element 50a, in particular the link guideway. Securing unit 26a comprises at least one spring element 52a, 54a, which applies a spring force in the direction of clamping element 20a, 22a, in particular clamping elements 20a, 22a, to at least one of the movably mounted further positive and/or non-positive locking elements 30a, 32a of securing unit 26a. One of two spring elements 52a, 54a of the securing unit 26a is preferably assigned to one of the other positive and/or non-positive locking elements 30a, 32a. It is conceivable that the securing unit 26a comprises at least one additional spring element (not shown in detail here), which applies a spring force in the direction of the transmission element 36a to the movably mounted additional positive and/or non-positive locking element 34a of the securing unit 26a. The clamping element 20a, 22a, in particular the clamping elements 20a, 22a, comprises/comprise at least one securing recess 56a, 58a, into which the further positive and/or non-positive locking element 30a, 32a engages at least partially in the clamping position of the clamping element 20a, 22a, in particular the clamping elements 20a, 22a.

The positive and/or non-positive locking element 30a, 32a, 34a, in particular the further positive and/or non-positive locking elements 30a, 32a and the additional positive and/or non-positive locking element 34a, can be moved by means of the operating unit 24a against a spring force of the spring element 52a, 54a. The operating unit 24a can comprise a force conversion element which, depending on a movement of the operating element 76a and/or the actuating element 82a in the direction of the clamping unit 16a, moves the positive and/or non-positive locking element 30a, 32a, 34a, in particular the further positive and/or non-positive locking elements 30a, 32a and the additional positive and/or non-positive locking element 34a, out of an engaged position. Alternatively, the operating unit 24a can have an electronic monitoring unit, which monitors a movement of the operating element 76a and/or the actuating element 82a, with a movement of the operating element 76a and/or the actuating element 82a the positive and/or non-positive locking element 30a, 32a, 34a, in particular the further positive and/or non-positive locking elements 30a, 32a and the additional positive and/or non-positive locking element 34a, can be moved out of an engaged position by means of an electric actuator. Other configurations of the operating unit 24a that appear sensible to a person skilled in the art for moving the positive and/or non-positive locking element 30a, 32a, 34a, in particular the further positive and/or non-positive locking elements 30a, 32a and the additional positive and/or non-positive locking element 34a, are also conceivable.

The securing unit 26a is formed at least partially in one piece with the clamping unit 16a, the securing unit 26a having at least one self-locking contour 42a arranged on the clamping element 20a, 22a. Securing unit 26a preferably includes at least two self-locking contours 42a, one of the at least two self-locking contours 42a being arranged on one of clamping elements 20a, 22a (in figure 3 only one of the two self-locking contours 42a is shown). The self-locking contour 42a is formed in one piece with the gate element 50a. In particular, the self-locking contour 42a forms an edge of the link element 50a that delimits the link element 50a. Link element 50a is preferably embodied as a link guide track which, by means of interaction with positive and/or non-positive locking element 28a embodied as link engagement element, is intended to move clamping element 20a, 22a, in particular clamping elements 20a, 22a, into the clamping position and/or into the release position. The self-locking contour 42a is arranged in a transition area between a clamping contour 46a and a release contour 48a of the link element 50a of the clamping unit 16a. The clamping contour 46a is intended to move the clamping element 20a, 22a, in particular the clamping elements 20a, 22a, into the clamped position by means of interaction with the positive and/or non-positive connection element 28a designed as a link engagement element. The release contour 48a is intended to move the clamping element 20a, 22a, in particular the clamping elements 20a, 22a, into the release position by means of an interaction with the positive and/or non-positive connection element 28a designed as a link engagement element.

In the clamping position of the clamping element 20a, 22a, in particular the clamping elements 20a, 22a, the self-locking contour 42a is aligned in such a way that when a force is applied which is decoupled from the operating unit 24a and acts in the direction of the release position of the clamping element 20a, 22a, in particular the clamping elements 20a, 22a, the clamping element 20a, 22a, in particular the clamping elements 20 a, 22a, a main securing force 38a can be exerted on the clamping element 20a, 22a, in particular on the clamping elements 20a, 22a, at least by means of the self-locking contour 42a, said main securing force running at least essentially perpendicular to a clamping axis 40a of the clamping unit 16a. The main securing force 38a preferably acts in such a way that no or only small force components act on the transmission element 36a along the clamping axis 40a. It can advantageously be achieved that the link engagement element cannot move into a release contour 48a of the link element 50a, in particular the link guideway. Preferably, by means of an interaction of the self-locking contour 42a with the positive and/or non-positive locking element 28a designed as a link engagement element, when a force acts on the clamping element 20a, 22a, in particular on the clamping elements 20a, 22a, which is decoupled from the operating unit 24a and acts in the direction of the release position of the clamping element 20a, 22a, in particular the clamping elements 20a, 22a , a main securing force 38a can be exerted on the clamping element 20a, 22a, in particular on the clamping elements 20a, 22a. Preferably, by means of an interaction of the self-locking contour 42a with the positive and/or non-positive locking element 28a configured as a link engagement element when a force acts on the clamping element 20a, 22a, in particular on the clamping elements 20a, 22a, which is decoupled from the operating unit 24a and acts in the direction of the release position of the clamping element 20a, 22a, in particular the clamping elements 20a, 22a , a possibility of movement of the clamping element 20a, 22a, in particular of the clamping elements 20a, 22a, in the release position largely blocked. The self-locking contour 42a encloses an angle of less than 40° with the clamping axis 40a of the clamping unit 16a, at least in the clamping position of the clamping element 20a, 22a, in particular the clamping elements 20a, 22a. It is conceivable that the self-locking contour 42a, in particular a contact surface 44a of the self-locking contour 42a, in the clamping position of the clamping element 20a, 22a, in particular the clamping elements 20a, 22a, in the direction of the operating unit 24a or in the direction of the clamping element 20a, 22a, in particular of the clamping elements 20a, 22a, is aligned, in particular in order to enclose an angle of less than 40° with the clamping axis 40a of the clamping unit 16a. The self-locking contour 42a has at least the contact surface 44a, which runs in the clamping position of the clamping element 20a, 22a, in particular the clamping elements 20a, 22a, at least essentially parallel to the clamping axis 40a of the clamping unit 16a. By means of an interaction of the contact surface 44a of the self-locking contour 42a and the positive and/or non-positive locking element 28a designed as a slotted link engagement element, when a force acts on the clamping element 20a, 22a, in particular on the clamping elements 2 0a, 22a, a main securing force 38a can be exerted on the clamping element 20a, 22a, in particular on the clamping elements 20a, 22a. A self-locking function of the clamping unit 16a and/or the securing unit 26a can advantageously be implemented in order to prevent the clamping element 20a, 22a, in particular the clamping elements 20a, 22a, when a force which is decoupled from the operating unit 24a and acts in the direction of the release position of the clamping element 20a, 22a, in particular the clamping elements 20a, 22a, acts on the clamping element 20a, 22a , in particular on the clamping elements 20a, 22a, to secure a movement of the clamping element 20a, 22a, in particular the clamping elements 20a, 22a, starting from the clamping position into the release position of the clamping element 20a, 22a, in particular the clamping elements 20a, 22a.

The security unit 26a has at least one output element 60a, which is provided to output at least one functional state of the security unit 26a to an operator. The output element 60a can be in the form of a mechanical element, an electronic element or an electrical element. The output element 60a is preferably provided to output a functional state of the safety unit 26a to an operator haptically, acoustically and/or optically. The functional state of securing unit 26a preferably describes a state of securing unit 26a, such as securing of tensioning element 20a, 22a, a released state of securing unit 26a in which tensioning element 20a, 22a is unsecured, a defect in securing unit 26a, or other states of securing unit 26a that appear sensible to a person skilled in the art. The output item 60a can be designed as a display, as an individual light source, such as an LED, as a mechanically movable display element, as a loudspeaker or the like.

In figure 4 another embodiment of the invention is shown. The following descriptions and the drawings are essentially limited to the differences between the exemplary embodiments, with regard to components having the same designation, in particular with regard to components having the same reference symbols, also to the drawings and/or the description of the other exemplary embodiments, in particular the Figures 1 to 3 , can be referenced. To distinguish between the exemplary embodiments, the letter a is the reference number of the exemplary embodiment in FIGS Figures 1 to 3 adjusted. In the embodiments of figure 4 the letter a is replaced by the letter b.

figure 4 shows a sectional view of an alternative portable power tool 14b and an alternative quick release device 10b. In the figure 4 portable machine tool 14b shown has a to the in the description to the Figures 1 to 3 described portable machine tool 14a at least substantially analogous configuration. The quick-action clamping device 10b for the portable machine tool 14b, which has at least one rotationally drivable output shaft 12b, comprises at least one clamping unit 16b which, for tool-free fixing of an insert tool unit (not shown in detail here) on the output shaft 12b, has at least one movably mounted clamping element 20b, 22b, in particular at least two movably mounted clamping elements 20b, 22b, to exert a clamping force on the insert tool unit in a clamping position of the clamping element 20b, 22b.

Furthermore, the quick-action clamping device 10b comprises at least one operating unit 24b for moving the clamping element 20b, 22b into the clamping position and/or into a release position of the clamping element 20b, 22b, in which the insert tool unit can be removed from the clamping unit 16b and/or the output shaft 12b. The operating unit 24b comprises at least one movably mounted operating element (not shown in detail here), which is intended to act on an actuating element 82b of the operating unit 24b in order to move the tensioning element 20b, 22b into the clamping position and/or into a release position.

The actuating element 82b is connected in a rotationally fixed manner to the output shaft 12b and is mounted in the output shaft 12b so that it can move in a translatory manner. However, it is also conceivable that the actuating element 82b and/or the operating unit 24b can be configured analogously to that in FIGS Figures 1 to 3 Actuating element 82a shown and/or to the in FIGS Figures 1 to 3 illustrated operating unit 24a are formed / is.

Furthermore, the quick-action clamping device 10b comprises at least one safety unit 26b designed as a self-locking unit, which is intended to cause a movement of the clamping element 20b, 22b, starting from the clamping position into the release position of the clamping element 20b, 22b, at least when a force acts on the clamping element 20b, 22b that is decoupled from the operating unit 24b and acts in the direction of the release position of the clamping element 20b, 22b stop. Securing unit 26b has, in particular in addition to a self-locking contour (not shown in detail here), at least one positive and/or non-positive locking element 28b, 30b, which can be brought about by a centrifugal force, in particular by a centrifugal force that can be caused as a result of a rotation of securing unit 26b and/or output shaft 12b about an axis of rotation 70b of output shaft 12b, into a securing position of positive and/or non-positive locking element 28b, 30b is movable, in which the clamping element 20b, 22b, starting from the clamping position, is largely secured against movement into the release position of the clamping element 20b, 22b. Securing unit 26b preferably comprises at least two positive and/or non-positive locking elements 28b, 30b, which can be moved by centrifugal force into a securing position of positive and/or non-positive locking elements 28b, 30b, in which position clamping element 20b, 22b, starting from the clamping position, is largely secured against movement into the release position of clamping element 20b, 22b. The positive and/or non-positive locking elements 28b, 30b are mounted such that they can move, in particular move in a translatory manner, along a direction running at least substantially perpendicularly to the axis of rotation 70b of the output shaft 12b. Securing unit 26b includes at least one spring element 52b, 54b, which applies a spring force in the direction of tensioning element 20b, 22b to at least one of the movably mounted positive and/or non-positive locking elements 30b, 32b of securing unit 26b. Preferably, the security unit comprises 26b at least two spring elements 52b, 54b, one of the at least two spring elements 52b, 54b each applying a spring force to one of the positive and/or non-positive locking elements 30b, 32b. The positive and/or non-positive locking elements 28b, 30b can be moved into a secured position by a centrifugal force against a spring force of the spring elements 52b, 54b. With regard to other features of the in figure 4 shown quick release device 10b may on the description in the Figures 1 to 3 illustrated quick release device 10a are referenced.

Claims (14)

1. Quick-clamping device for a portable power tool, in particular angle grinder, which has at least one output shaft (12a; 12b) which is able to be driven in rotation, having at least one clamping unit (16a; 16b) which, for tool-free fixing of an insert tool unit (18a) to the output shaft (12a; 12b), has at least one movably mounted clamping element (20a, 22a; 20b, 22b) for exertion of a clamping force on the insert tool unit (18a) in a clamping position of the clamping element (20a, 22a; 20b, 22b), and having at least one operator control unit (24a; 24b) for moving the clamping element (20a, 22a; 20b, 22b) into the clamping position and/or into a release position of the clamping element (20a, 22a; 20b, 22b), in which the insert tool unit (18a) is able to be removed from the clamping unit (16a; 16b) and/or from the output shaft (12a; 12b), characterized by at least one securing unit (26a; 26b), in the form of a self-locking unit, intended for preventing a movement of the clamping element (20a, 22a; 20b, 22b) from the clamping position into the release position of the clamping element (20a, 22a; 20b, 22b) at least in the event of the clamping element (20a, 22a; 20b, 22b) being acted on by a force which is decoupled from the operator control unit (24a; 24b) and which acts in the direction of the release position of the clamping element (20a, 22a; 20b, 22b).
2. Quick-clamping device according to Claim 1, characterized in that the securing unit (26a; 26b) has at least one movably mounted form-fit and/or force-fit element (28a, 30a, 32a, 34a; 28b, 30b) which, at least in the clamping position of the clamping element (20a, 22a; 20b, 22b), engages at least partially into the clamping element (20a, 22a; 20b, 22b) and/or into a transmission element (36a; 36b), interacting with the clamping element (20a, 22a; 20b, 22b), of the clamping unit (16a; 16b), for the purpose of securing the clamping element (20a, 22a; 20b, 22b) against a movement into the release position of the clamping element (20a, 22a; 20b, 22b) .
3. Quick-clamping device according to either of the preceding claims, characterized in that the securing unit (26a; 26b) has at least one movably mounted form-fit and/or force-fit element (28a, 30a, 32a; 28b, 30b) which, at least in the clamping position of the clamping element (20a, 22a; 20b, 22b), bears against the clamping element (20a, 22a; 20b, 22b) in such a way that a main securing force (38a; 38b) is able to be exerted on the clamping element (20a, 22a; 20b, 22b) along a direction which is at least substantially parallel or at least substantially perpendicular to a clamping axis (40a; 40b) of the clamping unit (16a; 16b), which main securing force counteracts a movement of the clamping element (20a, 22a; 20b, 22b) into the release position.
4. Quick-clamping device according to one of the preceding claims, characterized in that the securing unit (26a) is formed at least partially integrally with the clamping unit (16a), wherein the securing unit (26a) has at least one self-locking contour (42a) arranged on the clamping element (20a, 22a).
5. Quick-clamping device according to Claim 4, characterized in that the self-locking contour (42a) is, in the clamping position of the clamping element (20a, 22a), oriented in such a way that, in the event of the clamping element (20a, 22a) being acted on by a force which is decoupled from the operator control unit (24a) and which acts in the direction of the release position of the clamping element (20a, 22a), a main securing force (38a), which is directed at least substantially perpendicularly to a clamping axis (40a) of the clamping unit (16a), is able to be exerted on the clamping element (20a, 22a) at least by means of the self-locking contour (42a) .
6. Quick-clamping device according to Claim 4 or 5, characterized in that the self-locking contour (42a), at least in the clamping position of the clamping element (20a, 22a), includes an angle of less than 40° with a clamping axis (40a) of the clamping unit (16a).
7. Quick-clamping device according to one of Claims 4 to 6, characterized in that the self-locking contour (42a) has at least one contact surface (44a) which, in the clamping position of the clamping element (20a, 22a), extends at least substantially parallel to a clamping axis (40a) of the clamping unit (16a).
8. Quick-clamping device according to one of Claims 4 to 7, characterized in that the self-locking contour (42a) is arranged in a transition region between a clamping contour (46a) and a release contour (48a) of a slotted-guide element (50a) of the clamping unit (16a).
9. Quick-clamping device according to one of the preceding claims, characterized in that the securing unit (26a; 26b) comprises at least one spring element (52a, 54a; 52b, 54b) which acts on at least one movably mounted form-fit and/or force-fit element (30a, 32a, 34a; 30b, 32b) of the securing unit (26a; 26b) with a spring force in the direction of the clamping element (20a, 22a; 20b, 22b).
10. Quick-clamping device according to Claim 9, characterized in that the form-fit and/or force-fit element (30a, 32a, 34a) is movable counter to a spring force of the spring element (52a, 54a) by means of the operator control unit (24a).
11. Quick-clamping device according to Claim 9 or 10, characterized in that the clamping element (20a, 22a) comprises at least one securing recess (56a, 58a) into which the form-fit and/or force-fit element (30a, 32a) at least partially engages in the clamping position of the clamping element (20a, 22a) .
12. Quick-clamping device according to of the preceding claims, characterized in that the securing unit (26b) has at least one form-fit and/or force-fit element (30b, 32b) which is movable by way of a centrifugal force into a securing position of the form-fit and/or force-fit element (30b, 32b), in which securing position the clamping element (20b, 22b) is substantially secured against a movement into the release position of the clamping element (20b, 22b) from the clamping position.
13. Quick-clamping device according to one of the preceding claims, characterized in that the securing unit (26a; 26b) has at least one output element (60a; 60b) which is intended for outputting at least a functional state of the securing unit (26a; 26b) to an operator.
14. Portable power tool, in particular angle grinder, having a quick-clamping device according to of the preceding claims.

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