WO2012089642A2

WO2012089642A2 - Clamping device for hand-held power tool

Info

Publication number: WO2012089642A2
Application number: PCT/EP2011/073904
Authority: WO
Inventors: Jens Zieger; Tobias Lutz; Szabolcs Gyori
Original assignee: Robert Bosch Gmbh
Priority date: 2010-12-30
Filing date: 2011-12-23
Publication date: 2012-07-05
Also published as: WO2012089642A3; DE102010064372A1; DE102010064372B4

Abstract

The invention relates to a clamping device for a hand-held power tool, comprising at least one clamping unit (12; 12') for mounting a machining tool (14; 14') in an axial direction (16; 16') and at least one operating unit (18; 18') for actuating the clamping unit (12; 12'). According to the invention, the operating unit (18; 18') comprises at least one cam mechanism (26; 26') which is designed to move at least one coupling element (28, 30; 28') of the operating unit (18; 18') in at least in one component perpendicular to the axial direction (16; 16').

Description

description

Hand tool clamping device prior art

Hand tool clamping devices with a clamping unit for clamping a machining tool in an axial direction are already known, which have a control unit for actuating the clamping unit.

Disclosure of the invention

The invention is based on a hand tool clamping device with at least one clamping unit for clamping a machining tool in an axial direction and with at least one operating unit for actuating the clamping unit.

It is proposed that the operating unit has at least one cam gear, which is provided for the movement of at least one coupling element of the operating unit at least in one component at least substantially perpendicular to the axial direction. However, it is also conceivable that the coupling element can be moved by means of the cam mechanism along another direction that appears appropriate to a person skilled in the art. Particularly preferably, the cam mechanism is provided to the control unit rotatably coupled to the clamping unit and / or decouple. A "clamping unit" is to be understood here as meaning, in particular, a unit which secures a machining tool by means of a positive connection on a spindle, in particular an oscillatingly driven spindle, of a handheld power tool, in particular along the axial direction especially define a direction that at least substantially parallel to a pivot axis and / or axis of rotation of the spindle extends. Particularly preferably, the axial direction is coaxial with the pivot axis of the spindle. "Substantially parallel" is to be understood here as meaning, in particular, an alignment of a direction relative to a reference direction, in particular in a plane, wherein the direction relative to the reference direction is a deviation, in particular less than 8 °, advantageously less than 5 ° and particularly advantageously less than In this case, the term "operating unit" should in particular define a unit which has at least one operating element which can be actuated directly by an operator and which is provided by a process and / or by inputting parameters / or to influence and / or change a state of a unit coupled to the control unit. A "cam mechanism" is to be understood here in particular as a mechanism which, as a result of a movement of a cam member, in particular a rotational movement, and due to a geometric shape of the cam member cooperating with a geometrical shape of a further cam member, actuates a component passing through The term "coupling element" is intended here to define in particular an element which is intended to couple and / or decouple at least two components with one another, so that a force flow between the components can be made possible and / / or can be prevented. The term "at least in one component at least substantially perpendicular to the axial direction" is to be understood here as meaning, in particular, an orientation of a component of a vectorial motion variable in a two-dimensional Cartesian coordinate system, where at least one component describing the vectorial motion variable in the Cartesian coordinate system is perpendicular to the axial direction By means of the embodiment of the hand-held power tool clamping device according to the invention, advantageously, a high level of operating comfort of the hand-held power tool clamping device can be achieved Furthermore, a coupling and / or decoupling of the operating unit can be achieved structurally.

Advantageously, the cam mechanism is provided to move the coupling element in at least two opposite directions. It can be constructively simply a directional coupling and a directional gige decoupling of the coupling element due to a movement along one of the two opposite directions can be achieved.

It is also proposed that the cam mechanism has at least one cam member arranged on an operating lever of the operating unit. The term "arranged on an operating lever" is to be understood here as meaning, in particular, a connection of the cam member to the operating lever, so that the cam member can be moved together with the operating lever relative to a hand-held power tool housing, the cam member being fastened to the operating lever from a separate one The cam member preferably comprises at least one cam track, which is arranged on an inner surface of the operating lever and is in particular formed integrally with the operating lever A "cam track" is to be understood here as meaning, in particular, a geometric shape are specifically intended to move by means of a movement along a direction of movement to move a component, wherein a relative movement between the component and the geometric shape is generated, which in particular runs at least substantially perpendicular to the direction of movement. The term "integral" should be understood to mean, in particular, a materially bonded connection, such as by a welding process and / or adhesive process, etc., and particularly advantageously formed, such as by the production from a cast and / or by the production in a single- or multi-component By means of the embodiment of the power tool clamping device according to the invention, it is advantageously possible by means of a movement of the operating lever to generate a positioning force which is transmitted to the tool via the cam member

Actuate coupling element can act.

Preferably, the operating unit has a housing, and advantageously at least one cam member of the cam gear is arranged on the housing. It can be advantageously achieved a compact hand tool clamping device.

Furthermore, it is proposed that the operating unit has at least one coupling element formed by a rolling body. Preferably, the Wälz- body is designed as a cylindrical roller. It can be advantageously achieved by means of the cam gear, a low-friction movement of the coupling element. Advantageously, the operating unit has at least one coupling element formed by a spring element. A "spring element" is to be understood here as meaning, in particular, an element which is elastically deformable under a load, wherein the element can store a potential energy and automatically return to its pre-stress state after discharge by means of the stored potential energy Advantageously, a comfortable coupling and / or decoupling of the operating unit by means of the coupling element designed as a spring element can be achieved.

Preferably, the spring element is formed by a spring clip. A "spring clip" is to be understood here in particular as a spring element which has at least two opposite ends which are connected to one another elastically, at least by means of a circular arc-shaped leg, wherein the

Leg and the two opposite ends are preferably arranged in a plane. In this way, advantageously, a compact coupling element can be achieved, which can be arranged to save space. Furthermore, it is proposed that the operating unit has at least one operating lever which is rotatably mounted about at least one axis of rotation extending at least substantially parallel to the axial direction. A "control lever" is to be understood here in particular as a rotatably mounted control element of the control unit which has at least one lever element perpendicular to a rotation axis, wherein the lever element has a longitudinal extension which is at least twice as large as at least one other extension perpendicular to the axis of rotation The rotation axis of the control lever is particularly preferably at least substantially parallel to the axial direction. <br/> <br/> A high force effect on the tensioning unit can advantageously be achieved by lever lever use by means of the control lever.

Advantageously, the operating lever is mounted so as to be pivotable about at least one pivot axis extending at least substantially perpendicular to the axial direction. The operating lever is preferably pivotable about the pivot axis along an angular range of less than 360 °, in particular less than 270 ° and special ders preferably stored less than 190 °. The term "substantially perpendicular" is to be understood here in particular an orientation of a direction relative to a reference direction, wherein the direction and the reference direction, in particular in a plane, a Wnkel of 90 ° include and the Wnkel a maximum deviation of particular smaller as 8 °, advantageously smaller than 5 ° and particularly advantageously smaller than 2 ° It can be advantageously achieved an integration of at least two functions in the operating lever.

The invention is further based on a hand tool, in particular a hand tool with an oscillating drivable spindle, with a hand tool clamping device according to the invention. It can be advantageously achieved a high ease of use for an operator of the power tool.

drawing

Further advantages emerge from the following description of the drawing. In the drawing, two embodiments of the invention are shown. The drawing, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.

Show it:

1 shows a hand tool according to the invention with a hand tool clamping device according to the invention in a schematic representation,

2 is a sectional view along the line I I-I I of Figure 1 of the hand tool of the invention in a schematic representation,

3 shows a detailed view of a control lever of an operating unit of the hand-held device according to the invention located in a parking position. machine tool clamping device in a schematic representation,

Fig. 4 is a detail view of a means of a cam gear from a

Clamping unit decoupled operating lever of the operating unit of the hand tool clamping device according to the invention in a schematic representation,

5 is a detailed view of a latch unit of the operating unit of the hand tool clamping device according to the invention in a schematic representation,

6 is a detailed view of an operating lever arranged on the cam track of the cam gear in a schematic representation,

7 shows a detailed view of the operating lever in a clamping position of the operating unit of the hand-held power tool clamping device according to the invention in a schematic illustration,

Fig. 8 is a detail view of the means of the cam mechanism with the

Clamping unit coupled control lever of the operating unit of the hand tool clamping device according to the invention in a schematic representation,

9 is a detailed view of an operating lever located in a parking position of an alternative operating unit of a hand tool clamping device according to the invention in a schematic representation and

10 is a detail view of the means of the cam gear with the

Clamping unit coupled control lever of the alternative operating unit of the hand tool clamping device according to the invention in a schematic representation.

Description of the embodiments

FIG. 1 shows an electrically operated handheld power tool 50 with a handheld power tool clamping device 10. The handheld power tool 50 comprises a handheld power tool housing 52, which has an electric motor unit 54, a gear unit 56 and a power takeoff unit 58 of the hand tool. machine 50 encloses. The hand-held power tool housing 52 in this case comprises two housing half-shells 60, 62, which are detachably connected to one another along a plane extending through an axial direction 16. The axial direction 16 extends coaxially to a pivot axis 64 of a hollow spindle 66 designed as a work spindle 68 of the output unit 58 (Figure 2). At a tool holder

70 of the output unit 58 is a machining tool 14 for machining of workpieces fastened. The tool holder 70 is rotatably connected to the hollow spindle 66 by means of a press fit, so that a

Pivoting movement of the hollow spindle 66 can be transmitted to the tool holder 70 (Figure 2). However, it is also conceivable that the tool holder 70 is connected to the hollow spindle 66 by means of another type that appears appropriate to a person skilled in the art.

Figure 2 shows a sectional view through the hand tool 50 along the line I I-I I of Figure 1. The electric motor unit 54 arranged in the handheld power tool housing 52 comprises an output shaft 72, which is mounted in the handheld power tool housing 52 by means of a ball bearing 74 of the gear unit 56. On the output shaft 72, an eccentric sleeve 76 of the gear unit 56 is pressed, which comprises a pin 78 arranged eccentrically to a rotation axis 80 of the output shaft 72. The pin 78 is connected via a further ball bearing 84 of the gear unit 56 with a rocker 86 of the gear unit 56, which is rotatably connected to an outer ring of the other ball bearing 84. The rocker 86, in turn, is connected to an oscillating sleeve 88 of the gear unit 56 arranged on the hollow spindle 66. Upon rotation of the output shaft 72, an oscillating pivotal movement of the hollow spindle 66 about the pivot axis 64 is generated by an interaction of the eccentric sleeve 76, the rocker 86 and the oscillating sleeve 88. By means of the connection of the tool holder 70 and the hollow spindle 66, the machining tool 14 can also be driven in an oscillating manner. The hollow spindle 66 is in this case supported by a movable bearing designed as a needle bearing 90 of the output unit 58 and a bearing constructed as a ball bearing 92 of the output unit 58 fixed bearing in the power tool housing 52.

For rotationally fixed attachment of the machining tool 14, the machining tool 14 has driving recesses 94, which are distributed uniformly in a circular ring along a circumferential direction 96 on the machining tool 14 are arranged. The tool holder 70 has hump-like elevations 98 which correspond to the entrainment recesses 94 and extend in an assembled state of the machining tool 14 on the tool holder 70 along the axial direction 16 through the entrainment recesses 94. The hump-like elevations 98 are formed here as locking cams 100. For clamping the machining tool 14 in the axial direction 16, the hand tool 50 comprises the hand tool clamping device 10, which has a clamping unit 12 and an operating unit 18. The operating unit 18 comprises, for actuating the clamping unit 12, an operating lever 20 which is rotatable about a coaxial with the axial direction 16

Rotary axis 22 is mounted. Furthermore, the operating lever 20 is pivotable about an at least substantially perpendicular to the axial direction 16

Swivel axis 24 stored.

The clamping unit 12 has a rotatably mounted about the axial direction 16 first clamping element 102 which is formed as a spindle nut 104. The spindle nut 104 is rotatably mounted on a side facing away from the tool holder 70 in the power tool housing 52. Here, the spindle nut 104 is secured by means of a two-part housing 38 of the operating unit 18 along the axial direction 16 in the hand tool machine housing 52. The housing 38 of the operating unit 18 is also rotatably mounted in the power tool housing 52. The operating lever 20 is mounted by means of a bolt 152 pivotally about the pivot axis 24 on the housing 38. The clamping unit 12 further comprises a second clamping element 108 designed as a cylinder head screw 106. The cylinder head screw 106 has a shaft 110 and a screw head 12. The shaft 1 10 extends along the axial direction 16 through the hollow spindle 66 and engages with an external thread 1 14 of the shaft 1 10 in an internal thread 1 16 of the spindle nut 104 a. The screw head 1 12 has an integrally formed actuation cover 1 18, so that an operator can grip the screw head 1 12 comfortably. In this case, the actuation cover 1 18 has at least 1.5 times its extent along a direction perpendicular to the axial direction 16 compared to the screw head 12.

When mounting the machining tool 14, the machining tool 14 with the driving recesses 94 is pushed onto the corresponding elevations 98 of the tool mounting 70. Then the cylinder derkopfschraube 106 with the shaft 1 10 inserted through a central opening of the machining tool 14 into the hollow spindle 66 and passed through the hollow spindle 66 until the external thread 1 14 engages with the internal thread 1 16 of the spindle nut 104. Between the screw head 1 12 and the machining tool 14, viewed along the axial direction 16, a washer 170 is arranged, which is provided as a clamping flange. An operator can screw the cylinder head bolt 106 into the spindle nut 104 by means of the actuation cover 1 18 until the washer 170 abuts on the machining tool train 14. For clamping the machining tool 14 in the axial direction 16 on the tool holder 70, an operator by means of

Operating lever 20, the clamping unit 12 actuate. As a result, a clamping force is generated, which secures the machining tool 14 in an operation of the power tool 50 axially, so that the machining tool 14 can be driven to oscillate due to the connection with the tool holder 70. To avoid co-rotation of the cylinder head bolt 106 during a clamping operation and / or a release operation by means of the clamping unit 12 and the control unit 18 is formed as a rubber ring 172 friction element 174 between the hollow spindle 66 and the screw head 1 12 of the cylinder head bolt 106 is arranged. To relax or to change the processing tool 14, the procedure is essentially in the reverse order.

FIG. 3 shows a detailed view of the operating lever 20 of the operating unit 18 of the power tool clamping device 10 located in a parking position. In this parking position, the operating unit 18 is in a decoupling mode, such that a rotational drive of the operating lever 20 is provided by an oscillating pivoting movement of the hollow spindle 66 and / or the clamping unit 12 is stopped. In the parking position, the portable power tool 50 can be put into operation. Further, the operating lever 20 is secured in the parking position by means of a latching unit 124 of the control unit 18 against rotation about the rotation axis 22 and / or pivoting about the pivot axis 24 (Figure 5). The latching unit 124 has a first housing latching element 126 and a second housing latching element 128 which are detachably fastened to the handheld power tool housing 52 by means of a screw connection. However, it is also conceivable that the first housing latching element 126 and the second housing latching element 128 by means of another, to a person skilled in the sense appearing compound on Hand tool housing 52 are releasably secured or that the first housing latch member 126 and the second housing latch member 128 are integrally formed with the power tool housing 52. The first housing latching element 126 and the second housing latching element 128 each have a latching projection 130, 132. Furthermore, the latch unit 124 has a first one

Control lever detent element 134 and a second control lever detent element 136, which are each formed as a latching projection 138, 140. The first control lever detent element 134 and the second control lever detent element 136 are intended to lock in the parked position into the latching projections 130, 132 of the first housing detent element 126 and the second housing detent element 128. Further, the first operating lever detent member 134 and the second operating lever detent member 136 are formed integrally with the operating lever 20. The operating lever 20 has on a side facing away from the clamping unit 12 side 142 of the operating lever 20 has two elastically deformable locking projections 144, 146. In this case, the first control lever detent element 134 and the second control lever detent element 136 are each arranged on one of the latching extensions 144, 146. To release a latching connection between the first control lever detent element 134, the second control lever detent element 136 and the detent projections 130, 132 of the first housing detent element 126 and the second housing detent element 128, the detents 144, 146 of the control lever 20 can be elastically deformed relative to each other, so that the first one Operating lever detent 134 and the second control lever detent 136 disengage the latching projections 130, 132 of the first housing latch member 126 and the second housing latch member 128 reach. The operating lever 20 can be rotated about the rotational axis 22 after releasing the latching connection and / or can be pivoted about the pivot axis 24.

FIG. 4 shows a detailed view of the operating lever 20 decoupled from the clamping unit 12 by means of a cam mechanism 26 of the operating unit 18. The operating unit 18 has a first coupling element 28 formed by a rolling element 42 and a second coupling element formed by a rolling element 44

30 on. The cam mechanism 26 is provided to move the first coupling element 28 and the second coupling element 30 of the operating unit 18 at least in one component at least substantially perpendicular to the axial direction 18. The cam mechanism 26 is further provided to move the first coupling element 28 in two opposite directions 32, 34 and the second coupling element 30 in two opposite directions 32, 34 to move. The first coupling element 28 is in this case designed as a cylindrical roller 120. Further, the second coupling element 30 is also formed as a cylindrical roller 122. The cylindrical rollers 120, 122 each have an axis of rotation which runs at least substantially parallel to the axial direction. The axes of rotation of the cylindrical rollers 120, 122 each extend perpendicular to a circular base surface of the cylindrical rollers 120, 122. The cylindrical rollers 120, 122 are arranged in window-like openings 160, 162 of the housing 38 of the control unit 18. The cam mechanism 26 has a first cam member 36 arranged on the operating lever 20 and comprising two cam tracks 148, 150. The cam tracks 148, 150 are arranged on a bearing region 154 of the operating lever 20, which is provided for receiving the bolt 152 for pivotally mounting the operating lever 20 on the housing 38 of the control unit 18. The cam tracks 148, 150 are integrally formed with the operating lever 20 (Figure 6). Furthermore, the cam tracks 148, 150 are each arranged on a housing 38 of the operating unit 18 facing the inner surface of the bearing portion 154 of the operating lever 20. In this case, the curved paths 148, 150 extend in each case in a ramp shape around one of two recesses of the bearing area 154 receiving the pin 152. Furthermore, the first curved link 36 has two pressing elements 156,

158, which are integrally formed with the operating lever 20. The cam mechanism 26 also has a second cam member 40, which is arranged on the housing 38 of the operating unit 18. The second cam member 40 comprises two cam tracks 164, 166 formed as inclined surfaces. The cam tracks 164, 166 of the second cam member 40 are arranged adjacent to the window-like openings 160, 162 on the housing 38 of the operating unit 18, so that an interaction of the cam tracks 164, 166 of second cam member 40 with the cylindrical rollers 120, 122 is possible. In the parking position of the operating lever 20, the pressing elements 156, 158 of the first cam member 36 press the cylindrical rollers 120, 122 against the cam tracks 164, 166 of the second cam member 40. As a result, the cylindrical rollers 120, 122 are decoupled from Kupplungsausenhmungen 168 of the spindle nut 104. The Kupp- Lungsausnehmungen 168 are arranged along the circumferential direction 96 on a circumferential surface of the spindle nut 104. A power flow between the spindle nut 104 and the operating lever 20 is thus interrupted, so that a rotation can be prevented with the operating lever 20 in the parking position with an oscillating movement of the clamping unit 12 and the hollow spindle 66. During a pivoting movement of the operating lever 20 out of the parking position after a release of the locking connection of the latching unit 124 into a clamping position of the operating lever 20 (FIG. 7), the cylindrical rollers 120, 122 are produced by an interaction of the curved paths 148, 150 of the first curved member 36 and the curved paths 164, 166 of the second cam member 40 within the window-like openings 160, 162 respectively in the direction of the spindle nut 104 moves. The first coupling element 28 designed as a cylindrical roller 120 is hereby moved along a direction 32 which runs opposite to a direction 34 along which the second coupling element 30 designed as a cylindrical roller 122 is moved. The cylindrical rollers 120, 122 can roll on the cam tracks 148, 150 of the first cam member 36 and the cam tracks 164, 166 of the second cam member 40. With a swivel angle position of the operating lever 20, starting from the parking position of approximately 170 ° relative to the hand tool housing 52, the cylindrical rollers 120, 122 rest on the spindle nut 104 in each case in a coupling recess 168, so that the control lever 20 is non-rotatably coupled to the spindle nut 104 ( FIG. 8). By means of a force flow between the spindle nut 104 and the operating lever 20, a rotational drive of the spindle nut 104 can thus be made possible as a result of a rotational movement of the operating lever 20 about the axis of rotation 22. In this way, the machining tool 14 can be clamped in the axial direction 16 on the tool holder 70 and / or relaxed, for example, to a change of the machining tool 14.

After a clamping operation, the operating lever 20 is pivoted for decoupling from the rotational drive due to an oscillating movement of the clamping unit 12 and the hollow spindle 66 in an operation of the power tool 50, starting from the clamping position about the pivot axis 24. Here, the cylindrical rollers 120, 122 by means of an interaction of the pressing elements 154, 156 of the first cam member, the cam tracks 148, 150 of the first cam member 36 and the cam tracks 164, 166 of the second cam member 40 within the window-like openings 160, 162 each away from the spindle nut 104 moves out of the coupling recess 168 out. The pressing elements 154, 156 press the cylindrical rollers 120, 122 into complete decoupling from the respective coupling recess 168 against the curved paths 164, 166 of the second cam member 40. The first formed as a cylindrical roller 120 clutch member 28 is thereby moved along a direction 34 which is opposite to a direction 32 along which the second formed as a cylindrical roller 122 coupling member 30 is moved. After the cylindrical rollers 120, 122 are decoupled from the respective coupling recess 168, the operating lever 20 is freely rotatable about the axis of rotation 22. The operating lever 20 can thus be rotated from each position achieved by a clamping operation by a rotation about the axis of rotation 22 in a position necessary for pivoting into the parking position. After the rotation to reach the necessary position for swinging into the parking position becomes the operating lever

20 pivoted about the pivot axis 24 in the direction of the power tool housing 52 and secured by means of the latch unit 124 in the parking position. The operating unit 18 is thus in a decoupling mode, so that operation of the handheld power tool 50 is possible.

The handheld power tool 50 has an operating mode display unit 82 for signaling an operating mode of the operating unit 18 (FIG. 1). The operating mode display unit 82 signals the operator by means of display means (not shown here) in which operating mode the operating unit 18 is located. The display means may be formed by analogue display means, such as a pointer or the like, and / or electronic display means, such as LEDs or an LC display, etc. By means of the operating mode display unit 82, an incorrect operation can be prevented, in particular, a startup of the power tool 50 can be prevented in the event that the operating unit 18 is still in a coupling mode in which the operating lever 20 is rotatably connected to the spindle nut 104. The operating mode display unit 82 in this case has an electronic unit (not shown here), which is electronically connected to the electric motor unit 54. The electronics unit only provides current to the electric motor unit 54 when the operating unit 18 is in a decoupling mode. As an alternative to the operating mode display unit 82, however, it is also conceivable that the handheld power tool 50 has a control unit (not shown here) which is provided to prevent the handheld power tool 50 from being put into operation by means of a mechanical and / or electronic connection to the electric motor unit 54 if the operating unit 18 is still in Nem coupling mode is in which the operating lever 20 rotatably coupled to the clamping unit 12.

Figures 9 and 10 show a second alternative embodiment. Substantially identical components, features and functions are basically numbered by the same reference numerals. To distinguish the embodiments, the reference numerals of the alternative embodiment, an apostrophe, such as 10 'added. The following description is essentially limited to the differences from the first exemplary embodiment in FIGS. 1 to 8, wherein reference can be made to the description of the first exemplary embodiment in FIGS. 1 to 8 with regard to components, features and functions that remain the same.

FIG. 9 shows a detailed view of an operating lever 20 'of an operating unit 18' of a hand-held power tool clamping device 10 'that is alternative to the first exemplary embodiment. The hand tool clamping device 10 'further comprises a clamping unit 12' for clamping a machining tool 14 'in an axial direction 16'. The operating unit 18 'has for actuating the clamping unit 12' an operating lever 20 'which is rotatable about an at least substantially parallel to the axial direction

16 'extending axis of rotation 22' is mounted. The operating lever 20 'is further

pivotally mounted about an at least substantially perpendicular to the axial direction 16 'extending pivot axis 24'. Furthermore, the operating unit 18 'has a cam mechanism 26', which is provided for movement by a coupling element 28 'of the operating unit 18' at least in one component at least substantially perpendicular to the axial direction 16 '. The coupling element 28 'is formed by a spring element 46' designed as a spring clip 48 '.

The spring clip 48 'has two opposite ends 176', 178 ', which are elastically connected to one another by means of a circular-arc-shaped leg 180', wherein the leg 180 'and the two opposite ends 176',

178 'are arranged in a plane. The ends 176 ', 178' of the spring clip 48 'are arranged in window-like openings 160', 162 'of a housing 38' of the operating unit 18 '.

The cam mechanism 26 'has a cam member 36' arranged on the operating lever 20 'and comprising two cam tracks 148', 150 '. The cam tracks 148 ', 150 'are arranged on a bearing area 154' of the operating lever 20 ', which is provided for receiving a bolt 152' for pivotally mounting the operating lever 20 'on the housing 38' of the operating unit 18 '. The curved paths

148 ', 150' are formed integrally with the operating lever 20 '. Furthermore, the cam tracks 148 ', 150' are each arranged on a housing 38 'of the operating unit 18' facing inner surface of the bearing portion 154 'of the operating lever 20'. In this case, the cam tracks 148 ', 150' each extend in a ramp shape around one of two bolts 152 'receiving recesses of the storage area 154'.

In a pivoting operation of the operating lever 20 'from the parking position into a clamping position of the operating lever 20' (Figure 10), the ends 176 ', 178' of the spring clip 48 'by means of the cam tracks in the direction of a spindle nut 104' moves until the ends 176 ' , 178 'of the spring clip 48' rest in coupling recesses 168 'of the spindle nut 104' on the spindle nut 104 '. As a result, a rotationally fixed connection between the operating lever 20 'and the spindle nut 104' for clamping and / or relaxing a machining tool 14 'in the axial direction 16' is achieved. Upon pivotal movement, starting from the cocking position of the operating lever 20 ', the ends 176', 178 'of the spring clip 48' become displaced from the spindle nut 104 due to stored potential energy and motion release through the cam tracks 148 ', 150' ' emotional. The operating lever 20 'is thus decoupled from the clamping unit 12'.

Claims

claims

1. Hand tool clamping device with at least one clamping unit (12;

12 ') for clamping a machining tool (14; 14') in an axial direction (16; 16 ') and with at least one operating unit (18; 18') for actuating the clamping unit (12; 12 '),

characterized in that the operating unit (18; 18 ') has at least one cam mechanism (26; 26') which is adapted to move at least one coupling element (28,30; 28 ') of the operating unit (18; 18') at least in one component is provided perpendicular to the axial direction (16; 16 ').

2. Hand tool clamping device according to claim 1,

characterized in that the cam gear (26) is provided to the coupling element (28, 30) in at least two opposite

Directions (32, 34) to move.

3. Hand tool clamping device according to one of the preceding

Claims,

characterized in that the cam gear (26; 26 ') at least one on an operating lever (20; 20') of the operating unit (18; 18 ') arranged

Curve member (36, 36 ') has.

4. Hand tool clamping device according to one of the preceding

Claims,

characterized in that the operating unit (18) has a housing (38), and at least one cam member (40) of the cam mechanism (26) on the housing (38) is arranged. Hand tool clamping device according to one of the preceding claims,

characterized in that the operating unit (18) has at least one of a rolling body (42, 44) formed coupling element (28, 30).

Hand tool clamping device according to one of the preceding claims,

characterized in that the operating unit (18 ') at least one of a spring element (46') formed coupling element (28 ').

Hand tool clamping device according to claim 6,

characterized in that the spring element (46 ') by a spring clip (48') is formed.

Hand tool clamping device according to one of the preceding claims,

characterized in that the operating unit (18; 18 ') has at least one operating lever (20; 20') which is mounted rotatably about at least one axis of rotation (22; 22 ') extending at least substantially parallel to the axial direction (16; 16') ,

Hand tool clamping device according to claim 8,

characterized in that the operating lever (20; 20 ') is pivotally mounted about at least one at least substantially perpendicular to the axial direction (16; 16') extending pivot axis (24; 24 ').

Hand tool, in particular hand tool with an oscillating drivable spindle, with a hand tool clamping device according to one of the preceding claims.