CN206105402U - Clamping device and be equipped with this clamping device's swing power instrument - Google Patents

Abstract

The utility model provides a clamping device and be equipped with this clamping device's swing power instrument. The swing power instrument includes the output shaft of being pendulum motion around pivot axis, the output shaft has torque transfer zone territory, clamping device includes the adapter, the adapter include with the first switching portion of working head adaptation and with torque transfer zone territory complex second switching portion, second switching portion include with torque transfer zone territory complex cooperation limit. Use this clamping device's swing power instrument, the joinable is assorted working head not with it, has improved the commonality of this swing power instrument greatly.

Description

Clamping device and it is provided with the swing-type power tool of the clamping device

Technical field

This utility model is related to a kind of head that will work and is fitted to the clamping device of swing-type power tool, and is provided with clamping dress The swing-type power tool put.

Background technology

Swing-type power tool generally comprise housing, the motor being housed in housing, the output shaft for installment work head, with And the eccentric drive mechanism being connected between motor and output shaft, motor drive shaft rotary motion is converted to output by eccentric drive mechanism Oscillating motion of the axle around own axes.So, the free end in output shaft is connected with after different adnexa work heads, such as rip Piece, saw blade, triangle frosted disk etc., swing-type power tool can realize various operations, such as saw, cut, grind, scrape, with suitable Answer different work requirements.

But, some swing-type power tools are by the torque delivery areas with special shape by the power on output shaft Work head is transferred to, drives first of work to do oscillating motion.And at present on the market most of work head cannot all be attached to this Plant on swing-type power tool, need the special work of setting matching, so that the species of connection work head receives limit System, have impact on the versatility of the swing-type power tool.

Utility model content

Technical problem to be solved in the utility model is：A kind of clamping device is provided and the swing of tight device is held with this Power tool, it is possible to increase the versatility of swing-type power tool.

To solve above-mentioned technical problem, the technical scheme that this utility model is adopted is as follows：One kind is used to fit on work head The clamping device of swing-type power tool is fitted on, the swing-type power tool includes doing the output of oscillating motion around axis of oscillation Axle, the output shaft has torque delivery areas, and the clamping device includes adapter, and the adapter includes and the work Head adaptation the first switching part and with the torque delivery areas coordinate the second switching part, second switching part include with The mating edge that the torque delivery areas coordinate.

Preferably, second switching part includes boss, and the boss includes upper surface towards the output shaft, along institute The side wall of axis of oscillation extension is stated, the upper surface and the side wall are crossed to form the mating edge.

Preferably, definition is sagittal plane perpendicular to the plane of the axis of oscillation, and the side wall is perpendicular to the radial direction Plane.

Preferably, the mating edge for star polygon shape, the preferred even number angle of the polygon.

Preferably, the polygon has 4,6,8,10 or 12 angles etc..

Preferably, the swing-type power tool includes holding meanss, and the clamping device also includes pressing plate, pull bar and protects The connector of device cooperation is held, the pull bar sequentially passes through the pressing plate, the adapter to the connector, and the pressing plate With the connector without departing from the pull bar, the gap for accommodating the work head is provided between the pressing plate and the adapter.

Preferably, the holding meanss are moved between the open and the closed positions, the holding meanss include first, Second component, in open position, first, second component blocks the connector；In make position, described first, second Component disengages the connector.

Preferably, the torque delivery areas have at least two drivings that setting is spaced apart relative to the axis of oscillation Region, the drive area each has multiple points, wherein what the incisal plane on the point was located relative to the axis of oscillation Axial plane is obliquely installed.

Preferably, definition is sagittal plane perpendicular to the plane of the axis of oscillation, and the incisal plane on the point is with respect to institute State sagittal plane to be obliquely installed.

To solve above-mentioned technical problem, another technical scheme that this utility model is adopted is as follows：One kind swings power Instrument, it has the clamping device as described in above-mentioned claim.

Clamping device of the present utility model and the swing-type power tool with the clamping device, by what is arranged on adapter Mating edge coordinates with torque delivery areas, and the work head such that it is able to will not match that with output shaft is arranged on output shaft, greatly The versatility of the swing-type power tool is improve greatly.

Description of the drawings

Fig. 1 is the sectional perspective exploded view of this utility model swing-type power tool.

Fig. 2 is the fragmentary sectional view of swing-type power tool shown in Fig. 1, and now holding meanss are in an open position.

Fig. 3 is the fragmentary sectional view of swing-type power tool shown in Fig. 1, and now holding meanss are in the close position.

Fig. 4 is the cut-away view of the clamping device of swing-type power tool shown in Fig. 1.

Fig. 5 is the sectional perspective exploded view of another angle of swing-type power tool shown in Fig. 1.

Related elements reference numeral in diagram is as follows：

The second component of 32. output shaft, 38. holding meanss 44.

The connector of 34. axis of oscillation, 40. clamping device 46.

A 36. work incisal plane of 42. first component 47.

The sagittal plane 88d of 48. through hole 69., 88e, 88f the 4th,

The installation portion five of 50. square hole 70., the 6th installing hole

The adapter of 52. pressing plate, 72. work department 90.

The hole of 54. pull bar, 74. centre bore 91.

The switching part of 56. circular hole, 76. outward flange 92. first

The switching part of 58. main body 78.U type opening 94. second

The mating edge of 60. bar portion, 80. centrage 96.

62. step 82a, 82b, 82c the first, the 98.th end face

63. cover plates two, the 3rd radial slot 100. are raised

64. torque delivery areas 84a, the top surface of first, second grooves of 84b 101.

The boss of 66. drive area, 86. hypotenuse 102.

67. incisal plane 88a, 88b, 88c the first, the 104.th upper surface

68. points two, the side wall of the 3rd installing hole 106.

Specific embodiment

Below in conjunction with the accompanying drawings and specific embodiment the utility model is described in further detail.

Fig. 1 is referred to, swing-type power tool includes housing (not shown), the motor in housing, prolongs from housing The output shaft 32 for stretching out and the eccentric drive mechanism being connected between motor and output shaft 32, eccentric drive mechanism is by motor Rotary motion is converted to oscillating motion of the output shaft 32 around axis of oscillation 34.Between general about 0.5 to 7 degree of angle of oscillation, and Hunting frequency scope may be configured as about per minute 5000 to 30000 times.

Work 36 is arranged on the free end of output shaft 32, and axis of oscillation can be together surrounded under the drive of output shaft 32 34 swing.Work 36 can be straight blade, saw blade, triangle frosted disk etc., and swing-type power tool can be realized various Operation, such as saws, cuts, grinds, scrapes, to adapt to different work requirements.In the present embodiment, work 36 is semicircle saw blade.

Swing-type power tool also includes holding meanss 38, drives holding meanss 38 to move between the open and the closed positions Dynamic driving means (not shown) and the clamping device 40 of holding meanss cooperating.Driving means and holding meanss it is concrete Structure and working principle can refer to the description in CN105473282A.Holding meanss 38 are maintained on open position, by clamping Work 36 can be maintained at output shaft 36 by device 40.If work 36 needs to be taken out from output shaft 32, driving means Make holding meanss 38 in the close position, work 36 now can be removed from output shaft 32, can so carry out replacing work Work 36.

Holding meanss 38 include first, second component 42 and 44 of relative motion, referring to Fig. 2, in open position, first, Second component 42 and 44 is located remotely from each other；In make position, first, second component 42 and 44 (not shown) close to each other.

In order to work 36 is fixedly mounted on output shaft 32, clamping device 40 also includes and the cooperation of holding meanss 38 Connector 46.Connector 46 includes relative two sides, and one side is provided with and first, second component 42 towards output shaft 32 The through hole 48 coordinated with 44.Another side deviates from output shaft 32, is provided with square hole 50.With continued reference to Fig. 2, now, holding meanss 38 is in an open position, and first, second component 42 and 44 passes through through hole 48, and blocks connector 46；And work as driving means and promote Holding meanss 38 are moved to closing device, and referring to Fig. 3, first, second component 42 and 44 is close to each other, can take off from through hole 48 From then first, second component 42 and 44 will not block connector 46.Thus, just there is gap in the axial direction, so can release Put work 36.

Referring back to Fig. 2 and Fig. 4, clamping device 40 also includes the pressing plate 52 coordinated with work 36 and matches somebody with somebody with connector 46 The pull bar 54 of conjunction.Pressing plate 52 is ring-type, and middle part is provided with the circular hole 56 passed through for pull bar 54.Pull bar 54 includes discoid main body 58 and bar portion 60.In order to preferably driving force is delivered in work 36 from output shaft 32, the cross section of bar portion 60 is not provided with For circle, but it is preferably disposed to polygon or other shapes.In the present embodiment, the cross section of bar portion 60 is four sides Shape, bar portion 60 through the square hole 50 on the circular hole 56 to connector 46 on pressing plate 52, make pull bar 54 will not, so that bar portion 60 will not Opposite joints 46 produce relative rotation between the two.

Step 62 is provided with the free end of bar portion 60, connector 46 can be fastened on by pull bar by shackle member (not shown) On 54 step 62 so as to without departing from pull bar 54.The diameter with diameter greater than circular hole 56 of main body 58, thus, pressing plate 52 can not Depart from pull bar 54.Cover plate 63 is also arranged with the excircle of pressing plate 52, for covering the main body 58 of pressing plate 52 and pull bar 54

Referring back to Fig. 1, output shaft 32 is provided with the torque delivery areas 64 for driving work 36 to swing.Torque is transmitted Region 64 has at least two drive areas 66.The torque delivery areas 64 are designed to transmit driving force from output shaft 32 To in work 36, so as to drive work 36 to swing around axis of oscillation 34 together.

In the present embodiment, torque delivery areas 64 are substantially configured to the recess with star profile.Torque is passed Region 64 is passed with 12 drive areas 66, these drive areas 66 are arranged adjacent to one another, and can closely around swing Axis 34.Preferably, these drive areas 66 form bihexagonal star profile by arc transition.In present embodiment In drive area 66, the normal vector of any one point will not be located at and extend through on the straight line of axis of oscillation 34.Namely Say, the side wall of such drive area 66 will not be arranged parallel to axis of oscillation 34.But, these drive areas 66 at least local Ground bending.The curved design can be by here, either be with fixed or variable curvature half on unidirectional or two-way The convex and spill in footpath.Drive area can also be designed to by the face of this bending, and they are by its moulding and the bullet of material Property make bending change and especially make bending start basic disappearance from certain load (to essentially become flat to obey Drive area) elasticity.By such design, torque delivery areas 64 can be made particularly stable, the torque delivery areas make Obtain and equably driving force is passed to into work 36 from output shaft 32.

These drive areas 66 have respectively multiple points 68.Here point needs to understand from geometry, at that point Incisal plane reclines a face.Because point is geometric point, so these points are on the whole sightless.Using the vertical of point In the vector in incisal plane, describe the face and for example passing through three-dimensional system of coordinate or limited by other reference plane or the plane of reference Orientation in fixed space at that point.In the present embodiment, because each point on face is also simultaneously this utility model meaning Point under justice a, so face has infinite many points.Preferably, at least one, preferably multiple, particularly preferred a little go up Incisal plane be inclined relative to the axial plane that axis of oscillation 34 is located.It is further preferred that at least one, it is preferably many Individual, particularly preferred the incisal plane a little gone up is inclined relative to the sagittal plane of axis of oscillation 34.Here, define vertical In axis of oscillation 34 plane be sagittal plane.By this design of drive area 66, can be safe and reliable by work 36 It is fixed on output shaft 32.

Please goodbye Fig. 2, an incisal plane 67 and perpendicular to axis of oscillation 34 arrange sagittal plane 69 between surround angle Degree α.Preferred angle alpha is selected from specific scope, here, it is preferred that the angle [alpha] is less than 90 °, preferably smaller than 80 ° and is particularly preferably less than 75°；Further preferably the angle [alpha] is more than 0 °, more preferably greater than 45 ° and especially preferred more than 60 °.The further preferred angle [alpha] Between 62.5 ° to 72.5 °.It is preferred that the angle [alpha] is selected based on torque delivery areas 64, or it is preferably based on upper State the power occurred in region and carry out selection.Especially by as described before from above range selected angle α, on the one hand may be used To realize stable torque delivery areas, on the other hand driving force can also be equably imported in work 36.

Certainly, torque delivery areas 64 are not limited to the recess of star profile, it is preferable that at least driving each two Dynamic region is symmetrically arranged relative to the axial plane that axis of oscillation 34 is located.It is preferred that by two or more, the preferably drive of four Dynamic region is symmetrically arranged with regard to the axial plane that axis of oscillation 34 is located.Further, preferred these drive areas substantially phase Mutually purlieu is arranged.Here, being arranged in this utility model for mutually adjoining especially should also be understood to such setting：Drive Region is connected to each other by transitional region.It is preferred that such transitional region can be by bending extension or at least partially flat prolong The face region stretched is constituted.It is further preferred that such transitional region is tangentially connected at least one, preferably two drives area On domain.Especially, by this symmetrical, the setting mutually adjoined of drive area, have can torque delivery areas special High stability, and therefore realize to the good power transmission of work 36.

Preferably, torque delivery areas have even number drive area.It is preferred that torque delivery areas have 4 or more Drive area, more preferably 8 or more, and particularly preferably 12 or more.

Fig. 5 is referred to, work 36 is arranged on the free end of output shaft 32, here, work 36 is metal material, its Including the installation portion 70 and work department 72 that are attached on output shaft 32.The end of work department 72 is then provided with the saw with cutting function Tooth.Installation portion 70 is provided with the centre bore 74 and outward flange 76 passed through for pull bar 54, and centre bore 74 has center.And here, Because the relative work department 72 of installation portion 70 protrudes out, therefore, here outward flange 76 has carried out lead angle process.

Installation portion 70 includes generally U-shaped opening 78, and U-shaped opening 78 extends and connect in circular from outward flange 76 Heart hole 74.

Here, U-shaped opening 78 has centrage 80.If work 36 is symmetric design, then centrage 80 and work The centrage of head overlaps.

Installation portion 70 includes the first group of installing hole for connecting with centre bore 74 and being extended radially outwardly by centre bore 74.First Group installing hole includes the first radial slot 82a, the second radial slot 82b and the 3rd radial slot 82c.First radial slot 82a, the second radial direction Groove 82b and the 3rd radial slot 82c are extended radially outwardly clockwise by centre bore, and are respectively relative to centrage 80 in 90 ° of angles, 180 ° of angles, 270 ° of angles.U-shaped opening is located between the first, the 3rd radial slot 82a and 60c.

It can be seen that, the centrage of the centrage of the second radial slot 82b and the first radial slot 82a is in 90 degree of angles；3rd radially The centrage of groove 82c overlaps with the centrage of the first radial slot 82a.And second radial slot 82b centrage and U-shaped opening 78 Centrage 80 overlaps.

Installation portion 70 includes not connecting second group of installing hole with centre bore 74.Second group of installing hole includes being arranged on the first footpath To the first groove 84a between groove 82a and the second radial slot 82b, it is arranged between the second radial slot 82b and the 3rd radial slot 82c The second groove 84b.In the present embodiment, the shape of the first groove 84a and the second groove 84b, size all same, relative to the 3rd footpath Centrage to groove 82c is symmetrical arranged.

The centrage of the centrage of the first groove 84a, the centrage of the second groove 84b and the second radial slot 82b is in 45 degree of folders Angle.

U-shaped opening 78 includes a pair hypotenuses 86 extended from outward flange 76 to centre bore 74, the angle between two hypotenuses 86 Between 60 ° -80 °.Preferably, the angle between two hypotenuses 86 is 60 °.

Installation portion 70 also includes the 3rd group of installing hole disconnected with centre bore 74.3rd group of installing hole includes being arranged on the First, first, second installing hole 88a and 88b between the second radial slot 82a and 60b；It is arranged on described second, third radial slot The three, the 4th installing hole 88c and 88d between 82b and 60c；And be arranged between the first radial slot 82a and U-shaped opening 78 5th installing hole 88e and the 6th installing hole 88f being arranged between the 3rd radial slot 82c and U-shaped opening 78.

Wherein the center of the first installing hole 88a and the first radial slot 82a are in 30 ° of angles；Second installing hole 88b centrages with The centrage of the second radial slot 82b is in 30 ° of angles；The centrage of the 3rd installing hole 88c and the center of the second radial slot 82b Line is in 30 ° of angles；The centrage of the 4th installing hole 88d and the centrage of the 3rd radial slot 88c are in 30 ° of angles；5th installing hole The centrage of 88e is in 60 ° of angles with the centrage 80 of U-shaped opening 78；The centrage of the 6th installing hole 88f and U-shaped opening 78 Centrage 80 is in 300 ° of angles.

It is first installing hole 88a, the second installing hole 88b, the 3rd installing hole 88c and the 4th installing hole 88d, suitable by centre bore 74 Hour hands extend radially outwardly, and are respectively relative to centrage 80 in 120 ° of angles, 150 ° of angles, 210 ° of angles, 240 ° of angles.

The structure of above-detailed work 36, it is seen then that the installation portion 70 of work 36 and the torque of output shaft 32 Delivery areas 64 are not matched that, it is impossible to be directly installed on output shaft 32.Therefore, also include can work 36 for clamping device 40 Match the adapter 90 on output shaft 32.

See also Fig. 1 and Fig. 5, adapter 90 is arranged between output shaft 32 and work 36, one end and work Work 36 is connected, and other end connects with output shaft 32.Output shaft 32 transfers a driving force to work 36 by adapter 90, And then work 36 can be driven to swing around axis of oscillation 34 together.

Adapter 90 is in substantially annular shape, with the hole 91 that the bar portion 60 for pull bar 54 is passed through.In the present embodiment, hole 91 cross section is also to be preferably disposed to polygon.Here, the cross section in hole 91 also be tetragon, and with the phase of bar portion 60 Match somebody with somebody.Thus, bar portion 60 also there will not be relative rotation through after hole 91 with respect to adapter 90, driving so can be preferably transmitted Power.

Adapter 90 includes the first switching part 92 and the second switching part 94 being oppositely arranged, and the first switching part 92 is towards work 36, it is adapted to work 36.Second switching part 94 coordinates towards output shaft 32 with torque delivery areas 64.Wherein second turn Socket part 94 includes the mating edge 96 coordinated with torque delivery areas 64.

First switching part 92 is arranged on an end face 98 of adapter 90, including at least three prolong from end face 98 from axial direction The projection 100 stretched.In the present embodiment, the first switching part 92 includes eight from end face 98 from axially extending projection 100.Often Individual raised 100 is independent and circumferential be uniformly arranged.Raised 100 have top surface 101, and top surface 101 is to arc transition between end face 98. In present embodiment, five in eight projections 100 respectively with the first radial slot 82a, the second radial slot 82b, the 3rd radial slot 82c, the first groove 84a, the second groove 84b (Fig. 5) are fitted close, so as to radial positioning work 36.And arranging eight projections 100 makes Must work 36 can be matched with translation-angle with adapter 90.

Certainly, the concrete structure of the first switching part 92 is not limited to above-mentioned raised 100, and it can also be arranged on radially ratio Raised 100 more outward all some projections, its can with the first radial slot 82a, the second radial slot 82b, the 3rd radial slot 82c and At least one installing hole in 3rd group of installing hole (first, second, third, fourth, the five, the 6th installing hole 88a, 88b, 88c, 88d, 88e, 88f) it is fitted close.Certainly, the first switching part 92 can be according to the concrete shape of work 36, being arranged to polygon Shape or polygonal boss etc..

Dorsad the first switching part 92 is arranged second switching part 94, including axially extending boss 102.Boss 102 includes face Upper surface 104 to output shaft 32, the side wall 106 extended along axis of oscillation 34, upper surface 80 and side wall 106 are crossed to form and turn The mating edge 96 that square delivery areas 64 coordinate.

In the present embodiment, side wall 106 extends parallel to axis of oscillation.That is, the bearing of trend of side wall 106 hangs down Directly in the sagittal plane of axis of oscillation 34.Preferably, upper surface 104 is perpendicular to axis of oscillation 34.

Mating edge 96 is set to the shape of the star polygon matched with torque delivery areas 64.Thus, can be more preferable Transmission driving force.The wherein preferred even number angle of polygon.Polygon has 4,6,8,10 or 12 angles etc..At this In embodiment, mating edge 96 selects the shape of the bihexagonal star polygon as same torque delivery areas 64.Certainly, match somebody with somebody The polygonal shape that conjunction side 96 is surrounded follows the alteration of form of square delivery areas 64 of walking around and changes.

Referring back to Fig. 2 and Fig. 5, the gap for accommodating work 36 is provided between pressing plate 52 and adapter 90.Swing power work At installment work 36, the hypotenuse 86 first by arranging in work 36 is inserted between pressing plate 52 and adapter 90 tool In gap, at the same make the first radial slot 82a, the second radial slot 82b, the 3rd radial slot 82c, the first groove 84a, the second groove 84b with The projection 100 of the second switching part 74 is fitted close, so as to radial positioning work 36；Then holding meanss are made by driving means 38 is in an open position, during holding meanss 38 are moved to open position from make position, the He of first, second component 42 44 block connector 46, and drive pull bar 54, pressing plate 52, adapter 90 to move towards the direction of output shaft 32, and pressing plate 52 is axially The lower surface of the installation portion 70 of extruding work 36, until the installation portion 70 of work 36 is fixed on adapter 90 and pressing plate 52 Between, axial gap is eliminated, so as to axial restraint work 36.Meanwhile, mating edge 96 is transmitted with the torque on output shaft 32 Region 64 is fitted close, thus, work 36 can be firmly installed on output shaft 32, and the driving force on output shaft 32 can With Transmit evenly to work 36.

And when more change jobs 36 when, drive holding meanss 38 to be moved to closure position from open position by driving means Put, can be found in Fig. 3, first, second component 42 and 44 disengages the through hole 48 of connector 46, now pull bar 54, pressing plate 52, adapter 90 move away from the direction of output shaft 32, so as to produce gap on axial direction so that work 36 can be from output shaft 32 Take out, such that it is able to be operated 36 replacing.

Certainly, clamping device 40 can not take off because first, second component 42 and 44 is disengaged with the through hole 48 of connector 46 From swing-type power tool, it can arrange the structure such as draw-in groove and bearing pin between holding meanss 38 and clamping device 40.

It is appreciated that the holding meanss in swing-type power tool are also not limited to first, second that present embodiment is enumerated Component, can also only arrange a component, be capable of achieving to drive pull bar axial movement.Possibly even it is not provided with keeping dress Put, and bolt is only set, through work head and adapter and can also with being threadedly coupled on output shaft.

This utility model is not limited to the embodiment in aforementioned embodiments, and those skilled in the art are in this utility model It is also possible to make other changes under the enlightenment of technical spirit, but as long as its function of realizing is same or similar with this utility model, All should be covered by this utility model protection domain.

Claims (10)

1. a kind of clamping device, for the head that will work swing-type power tool is fitted to, and the swing-type power tool includes surrounding pendulum Shaft line does the output shaft of oscillating motion, and the output shaft has torque delivery areas, and the clamping device includes adapter, institute State the second switching that adapter includes the first switching part being adapted to the work head and coordinates with the torque delivery areas Portion, it is characterised in that：Second switching part includes the mating edge coordinated with the torque delivery areas.

2. clamping device according to claim 1, it is characterised in that：Second switching part includes boss, the boss Including the upper surface towards the output shaft, the side wall extended along the axis of oscillation, the upper surface and the side wall intersect Form the mating edge.

3. clamping device according to claim 2, it is characterised in that：Definition is footpath perpendicular to the plane of the axis of oscillation To plane, the side wall is perpendicular to the sagittal plane.

4. clamping device according to claim 1, it is characterised in that：The mating edge for star polygon shape, institute State polygon and there is even number angle.

5. clamping device according to claim 4, it is characterised in that：The polygon have 4,6,8,10 or 12 angles.

6. clamping device according to claim 1, it is characterised in that：The swing-type power tool includes holding meanss, institute Stating clamping device also includes the connector that pressing plate, pull bar and holding meanss coordinate, and the pull bar sequentially passes through the pressing plate, institute Adapter is stated to the connector, and the pressing plate and the connector are without departing from the pull bar, the pressing plate and the switching The gap for accommodating the work head is provided between device.

7. clamping device according to claim 6, it is characterised in that：The holding meanss are in open position and make position Between move, the holding meanss include first, second component, in open position, first, second component blocks the company Fitting；In make position, first, second component disengages the connector.

8. clamping device according to claim 1, it is characterised in that：The torque delivery areas are relative with least two The drive area of setting is spaced apart in the axis of oscillation, the drive area each has multiple points, wherein on the point Incisal plane is obliquely installed relative to the axial plane that the axis of oscillation is located.

9. clamping device according to claim 8, it is characterised in that：Definition is footpath perpendicular to the plane of the axis of oscillation To plane, the relatively described sagittal plane in incisal plane on the point is obliquely installed.

10. a kind of swing-type power tool, it has the clamping device as described in claim 1 to 9 is arbitrary.