CN102328305B

CN102328305B - Power tool

Info

Publication number: CN102328305B
Application number: CN201010234752.6A
Authority: CN
Inventors: 李成道; 霍立祥; 吴海全; 李辉
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Positec Power Tools Suzhou Co Ltd
Priority date: 2010-07-12
Filing date: 2010-07-12
Publication date: 2014-02-26
Anticipated expiration: 2030-07-12
Also published as: WO2012006867A1; CN102328305A

Abstract

The invention discloses a power tool, which comprises a head shell, an output shaft, an elastic clamping piece and a working head, wherein the output shaft extends out of the head shell; the elastic clamping piece is arranged at the free end of the output shaft; the working head is arranged on the clamping piece; the output shaft is used for driving the working head to move through the clamping piece; the free end of the output shaft is provided with a push rod extending into the clamping piece; the clamping piece operably moves relative to a space between a first position and a second position along the longitudinal axis of the output shaft; at the first position, the clamping piece is provided with a first radial size for clamping the working head; at the second position, the clamping tool is provided with a second radial size for releasing the working head; and the first radial size is larger than the second radial size. Due to the adoption of the power tool, the working head can be clamped in the radial direction and be prevented from sliding during working.

Description

Power tool

Technical field

The present invention relates to a kind of power tool, especially a kind of power tool of hand-held.

Background technology

Multi Role Aircraft is the power tool of the common hand-held of industry, and its operation principle is that output shaft is done oscillating motion around the longitudinal axis of self.Therefore, on the free end of user at output shaft, be provided with after different working heads, after straight blade, saw blade, triangle frosted dish, shovel type scraper, can realize multiple different operating function, as sawed, cut, grind, scrape etc., to adapt to different work requirements.

Comparatively common Multi Role Aircraft, structurally generally comprises motor in the market, and the motor shaft of motor is connected with cam pin, is arranged with bearing on cam pin, thereby forms an eccentric wheel structure.When motor shaft rotates, eccentric wheel structure can be done eccentric rotary motion around the axial line of motor shaft.The output shaft of Multi Role Aircraft is perpendicular to motor shaft setting, fixingly on output shaft be connected with a pull-fork assembly, pull-fork assembly is formed with two relative adjutages, eccentric wheel structure is surrounded, the inner side of two adjutages all with eccentric wheel structure in bearing close contact, thereby when eccentric wheel is done eccentric rotary, eccentric wheel structure can drive shift fork to produce the oscillating motion in horizontal direction, by being fixedly connected with of shift fork and output shaft, output shaft is swung around its axial line again.At the free end of output shaft, install after different working heads, Multi Role Aircraft can realize multiple operating function under oscillating motion at a high speed.

The at present installation of annex, is generally that the installing hole by annex is arranged on the free-ended installation portion of output shaft, and then by locking piece, pass annex installing hole and insert output shaft and fix, thereby annex is fixed on output shaft.Wherein, the installing hole of annex is generally regular regular polygon, and the installation portion of output shaft is similarly the regular polygon corresponding with installing hole.The fixed form of above-mentioned annex, just clamps annex in the axial direction, and lacks chucking power diametrically.Therefore,, in working for a long time, particularly, in the situation that load is larger, simple axial chucking power is not enough to transmit satisfactory moment of torsion, causes radially skidding of the relative output shaft of annex, affects the use of instrument.

Therefore, be necessary to provide a kind of improved power tool in fact, to address the above problem.

Summary of the invention

The object of the present invention is to provide a kind of power tool, can clamp diametrically working head and prevent that working head from skidding in use.

For achieving the above object, the invention provides a kind of power tool, it comprises head capsule, the output shaft extending in described head capsule, is arranged on the free-ended elastic clamping pieces of output shaft and is arranged on the described working head on described holder, and described output shaft drives working head to move by holder.Wherein, the free end of described output shaft is provided with the push rod extending in described holder, and described holder operationally moves between primary importance and the second place along the relatively described push rod of longitudinal axis of described output shaft.When primary importance, described holder has the first radial dimension to clamp described working head; When the second place, described holder has the second radial dimension to discharge described working head, and described the first radial dimension is greater than described the second radial dimension.

Preferably, the end of described push rod is provided with boss, and the side of described boss forms the first inclined-plane, and described holder is provided with the ratchet that is set in described boss periphery, and the inside of described ratchet is formed with second inclined-plane that can coordinate with described the first inclined-plane.

Preferably, described boss is terrace with edge shape.

Preferably, described boss is truncated cone-shaped.

Preferably, between described output shaft and described holder, be provided with driving member, described output shaft passes to described holder by described driving member by moment of torsion.

Preferably, described power tool further comprises free-ended axle sleeve and the quick change clamping device that is arranged on described output shaft, described holder be housed in described axle sleeve and and described axle sleeve between be provided with in the axial direction elastic component, under the effect of described elastic component, described holder, in clamping the primary importance of described working head, operates described quick change clamping device and can make described holder by primary importance, be moved to the second place that discharges described working head.

Preferably, described quick change clamping device comprises operating parts, be arranged on depression bar assembly in described output shaft be connected with depression bar assembly from lock set, describedly between lock set and described holder, be provided with pin, operate described operating parts and can drive by described depression bar assembly that the longitudinal axis along described output shaft moves from lock set, describedly from lock set and then by described pin, drive described holder to move along the longitudinal axis of described output shaft.

Preferably, described holder is threaded in the free end of described output shaft, rotates described holder and can make it longitudinal axis along described output shaft moves relative to described push rod.

Preferably, described power tool further comprises and is arranged on the free end of described output shaft the axle sleeve that can rotate relative to described output shaft, described holder is housed in described axle sleeve, the madial wall of described axle sleeve is provided with spiral yarn shaped track, described holder is provided with the projection in the track that can be housed in described axle sleeve, rotate described axle sleeve and can make the projection of described holder slide in the track of described axle sleeve, thereby drive described holder to move along the longitudinal axis of described output shaft.

Preferably, described holder comprises flange portion and the ratchet extending from flange portion one side, and the end of described ratchet is formed with the installation portion that described working head can be installed.

Beneficial effect of the present invention is: by the free end at output shaft, push rod and elastic clamping pieces are set, operation holder moves relative to push rod along the longitudinal axis of output shaft, can make holder and push rod joint or separated, thereby make holder radially softened or shrink, thereby radial clamping or release working head, thereby can facilitate installment work head and can prevent that radially skidding from appearring in working head in use.

Accompanying drawing explanation

Fig. 1 is the schematic perspective view of power tool the first embodiment of the present invention.

Fig. 2 is the three-dimensional explosive view of power tool shown in Fig. 1.

Fig. 3 is the generalized section of the primary importance state of power tool shown in Fig. 1, and wherein quick change clamping device is in clamped position, and working head clamping anti-slipping mechanism is in tension position.

Fig. 4 is the generalized section of the second place state of power tool shown in Fig. 1, wherein the locking part of the quick change clamping device stop part of just having conflicted.

Fig. 5 is the generalized section of the 4th location status of power tool shown in Fig. 1, and wherein working head clamping anti-slipping mechanism is in punctured position.

Fig. 6 is the local enlarged diagram of A position in Fig. 3.

Fig. 7 is the local enlarged diagram of B position in Fig. 4.

Fig. 8 is the part section enlarged diagram of the 3rd location status of power tool shown in Fig. 1, and wherein quick change clamping device is in off-position.

Fig. 9 is the local enlarged diagram of C position in Fig. 5.

Figure 10 is the schematic perspective view of self-locking sleeve pipe in Fig. 2.

Figure 11 is the schematic perspective view of locking part in Fig. 2.

Figure 12 is from the schematic perspective view of lock set in Fig. 2.

Figure 13 is from the generalized section of lock set shown in Figure 12.

Figure 14 is the generalized section coordinating with the chamber of output shaft from lock set in Fig. 2.

Figure 15 is the decomposing schematic representation of working head clamping anti-slipping mechanism in Fig. 2.

Figure 16 is that the holder of working head clamping anti-slipping mechanism in Figure 15 is the schematic diagram that radially struts tensioning state.

Figure 17 is that the holder of working head clamping anti-slipping mechanism in Figure 15 is the schematic diagram that radial contraction is drawn close state.

Figure 18 shows that the schematic diagram of locking part and fastener element mated in the second embodiment.

Figure 19 shows that the schematic diagram of locking part and fastener element mated in the 3rd embodiment.

Figure 20 shows that the schematic diagram of locking part and fastener element mated in the 4th embodiment.

Figure 21 is depicted as the schematic diagram of locking part and fastener element mated in the 5th embodiment.

Figure 22 is depicted as the schematic diagram of locking part and fastener element mated in the 6th embodiment.

Figure 23 is depicted as the schematic diagram of locking part in the 7th embodiment.

Figure 24 is depicted as the schematic diagram of locking part in the 8th embodiment.

Figure 25 is depicted as the schematic diagram of locking part in the 9th embodiment.

Figure 26 is depicted as the schematic diagram that clamps anti-slipping mechanism in the tenth embodiment.

Figure 27 is depicted as the schematic diagram that clamps anti-slipping mechanism in the 11 embodiment.

Figure 28 is depicted as the schematic diagram that clamps anti-slipping mechanism in the 12 embodiment.

Figure 29 is depicted as the schematic diagram of Figure 28 bottom bracket axle.

Related elements reference numeral in diagram is as follows:

1. casing 300. is from lock set 343. openings

100. operating parts 31. upper shell 344. installing ports

101. first surface of revolution 310. self-locking sleeve pipe 345. anti-rotation grooves

102. second surface of revolution 32. lower house 347. second grooves

110. cam part 320. locking part 35. lower surfaces

120. pivotal pin 321. main body 36. shaft shoulder portions

130. bracing frame 322. pivot connector 37. stop pins

140. bracing frame 323. perforation 38. accepting holes

150. handle 324. tight lock part 39. pins

151. pivot connector 3241. coat 4. switches

2. head capsule 3242. depressed part 400. push rods

200. depression bar assemblies 324 '. tight lock part 401. boss

21. horizontal parts 324 ". tight lock part 402. first inclined-planes

210. depression bar 325. upper inner surface 410. holders

22. 326. times, vertical portion inner surface 411. flange portion

220. second elastic component 327. first groove 412. ratchets

23. bearing 328. first elastic component 413. host cavities

24. bearing 33. chamber 414. second inclined-planes

230. baffle plate 330. sleeve pipe 415. installation portions

240. depression bar head 34. upper surface 420. hollow shaft housings

250. depression bar tail 340. self-locking chamber 421. inner faces

260. pad 341. sidewalls 430. the 3rd elastic components

3. output shaft 342. roof 440. pins

450. pad 54. tightening member 800. push rods

50. tightening member 541. pressing plate 801. boss

501. pressing plate 542. bar portion 802. the 3rd grooves

502. bar portion 543. auxiliary section 803. external screw threads

503. auxiliary section 55. tightening member 810. holders

51. tightening member 551. pressing plate 811. flange portion

511. pressing plate 552. bar portion 812. ratchets

512. bar portion 553. auxiliary section 813. internal threads

513. auxiliary section 554. coat 900. push rods

514. groove 6. working head 901. boss

52. tightening member 61. installing hole 910. holders

521. pressing plate 700. push rod 911. flange portion

522. bar portion 701. boss 912. ratchets

523. auxiliary sections 702. the 3rd groove 913. projections

53. tightening member 703. driving member 920. axle sleeves

531. pressing plate 710. holder 921. guiding grooves

532. bar portion 711. flange portion 922. tracks

533. auxiliary sections 712. the 4th groove

The specific embodiment

Below in conjunction with the drawings and the specific embodiments, the present invention is described in further detail.

Refer to Fig. 1 and Fig. 2, a kind of power tool, a kind of oscillating machine specifically, it comprises be casing 1, the head capsule 2 that is connected to casing 1 front end (being defined as front end with right side in Fig. 1) and the output shaft 3 extending that lengthwise extends in head capsule 2.Wherein, in casing 1, be provided with motor (not shown), on casing 1, be also provided with unlatching or shutoff that switch 4 is controlled motor.Head capsule 2 comprises the horizontal part 21 that is connected with casing 1 and arranges along horizontal direction in Fig. 1 and from the substantially vertical vertical portion 22 to downward-extension of end of horizontal part 21.Output shaft 3 is in vertical direction setting, and its one end is arranged in head capsule 2, and the other end is interior from the vertical portion 22 of head capsule 2 to be gone out to downward-extension, and can do around the longitudinal axis X of self oscillating motion, and swaying direction is as shown in double-head arrow in Fig. 1.

In addition, in the inside of head capsule 2, be also provided with industry conventional eccentric wheel (not shown) and pull-fork assembly (not shown) on oscillating machine, in order to the rotation output torque of motor is converted into the swing output torque of output shaft 3.As shown in fig. 1, at the free end of output shaft 3, can working heads 6 be installed by tightening member 50, in present embodiment, working head 6 is a kind of straight blades, and this working head 6 can be done oscillating motion along the double-head arrow direction in Fig. 1 under the drive of output shaft 3.Tightening member 50 comprises tabular pressing plate 501 and from pressing plate 501 center upwardly extending bar portion 502, bar portion 502 ends are provided with the auxiliary section 503 with the smooth face of cylinder.

Refer to Fig. 2 and Fig. 3, this oscillating machine comprises and can, at the quick change clamping device of off-position and clamped position conversion, be arranged on the tightening member 50 of output shaft 3 ends for quick-detachment.This quick change clamping device comprise be located in output shaft 3 and can clamp or discharge tightening member 50 from lock set 300 and make locking part 320 clamp or discharge the brake assemblies of tightening member.In present embodiment, brake assemblies comprise operating parts 100 on the horizontal part 21 that is arranged on head capsule 2 and with the optionally connected tactile depression bar assembly 200 of operating parts 100, from 300 of lock sets, comprise self-locking sleeve pipe 310 and be housed in the locking part 320 in self-locking sleeve pipe 310.In present embodiment, output shaft 3 comprises upper shell 31 and lower house 32, and the two is supported by two bearings 23,24 up and down that are positioned at head capsule 2 inside respectively.After upper shell 31 and lower house 32 connect as one, the inside of output shaft 3 is just formed with chamber 33, this chamber 33 has upper surface 34 and the lower surface 35 being oppositely arranged along axial direction, and the depression bar assembly 200 of above-mentioned quick change clamping device and being all arranged in the chamber 33 of output shaft 3 from lock set 300.

Continue to consult Fig. 2 and Fig. 3, operating parts 100 is a cam spanner, and it comprises handle 150 and cam part 110 that split arranges, and the end of handle 150 is provided with two parallel relative pivot connectors 151, can drive cam part 110 to rotate together during rotary handle 150.In addition, two bracing frames 130,140 that are relatively set with on the horizontal part 21 of head capsule 2, the pivot connector 151 of handle 150 is placed between above-mentioned bracing frame 130,140, cam part 110 is further placed between two pivot connectors 151, then by a pivotal pin 120, above-mentioned handle 150 and cam part 110 is articulated in respectively between two bracing frames 130,140.This cam part 110 has two arc rotary surfaces 101,102 with respect to pivotal pin 120, and the first surface of revolution 101 is wherein less than the second surface of revolution 102 apart from the distance of pivotal pin 120 apart from the distance of pivotal pin 120.User can make this operating parts 100 rotate between two position of rotation by pulling handle 150, on the first position of rotation, the first surface of revolution 101 of cam part 110 departs from depression bar assembly 200, and on the second position of rotation, the second surface of revolution 102 of cam part 110 contacts with depression bar assembly 200.It is to be noted, the first surface of revolution 101 of cam part 110 can not be separated from depression bar assembly 200 yet, but contact with depression bar assembly 200 in the rotary course of operating parts 100, as long as the first surface of revolution 101 is less than the second surface of revolution 102 apart from the distance of pivotal pin 120 apart from the distance of pivotal pin 120. always

Continue to consult Fig. 2 and Fig. 3, above-mentioned depression bar assembly 200 comprises depression bar 210, the second elastic component 220 and is positioned at the pad 260 of the second elastic component 220 belows.On depression bar 210, along radial direction, extended to form baffle plate 230, by this baffle plate 230, described depression bar 210 can be divided into two parts, and the depression bar head 240 extending on the horizontal part 21 of head capsule 2 and circle diameter are slightly less than the depression bar tail 250 of depression bar head 240.Wherein, depression bar head 240 extends after head capsule 2, is positioned at pivotal pin 120 belows relative with cam part 110, and depression bar tail 250 and is equally arranged on connecting from lock set 300 of output shaft 3 inside.In addition, the second elastic component 220 is set on depression bar tail 250, and its one end and baffle plate 230 connect, and the other end connects with the above-mentioned pad 260 that is arranged in the chamber 33 of output shaft 3 and be set in equally on depression bar tail 250.It should be noted that, in the internal chamber 33 of output shaft 3, be also formed with a shaft shoulder portion 36, pad 260 is arranged in shaft shoulder portion 36, thereby limits moving axially of the second elastic component 220.

Please consult successively Fig. 3, Fig. 4, Fig. 8 and Fig. 5, operating parts 100 is positioned at respectively the first, second, third and the 4th position of rotation successively.Depression bar assembly 200 is arranged in the internal chamber 33 of output shaft 3, and can move by the axial direction along output shaft 3 along with the turning effort of operating parts 100.As shown in Figure 3, when user by operating parts 100 rotation on the first position of rotation time, the first surface of revolution 101 is disengaged position with depression bar head 240, now, depression bar 210 moves to the top of the internal chamber 33 of output shaft 3 under the elastic force effect of the second elastic component 220, and baffle plate 230 contacts with the upper surface 34 of internal chamber 33.As shown in Fig. 4, Fig. 8 and Fig. 5, and when user by operating parts 100 rotation on the second position of rotation to the four position of rotation time, the second surface of revolution 102 is contact condition all the time with depression bar head 240, in this process, under the effect of operating parts 100, along output shaft 3, the axial direction away from operating parts 100 moves depression bar 210, and by baffle plate 230 compression the second elastic components 220, make the second elastic component 220 be contraction state.

Refer to Fig. 2, Figure 10 to Figure 13, from lock set 300, comprise self-locking sleeve pipe 310 and the locking part 320 that is positioned at self-locking sleeve pipe 310.This self-locking sleeve pipe 310 is roughly step-like, and it comprises the sleeve pipe 330 and the self-locking chamber 340 that is connected in sleeve pipe 330 belows and is similarly hollow circular cylinder shape that is roughly hollow circular cylinder shape, and the radial dimension in self-locking chamber 340 is greater than the radial dimension of sleeve pipe 330.The depression bar tail 250 of above-mentioned depression bar 210 is inserted and secured in sleeve pipe 330, thereby can drive sleeve pipe 330 moving axially.

Self-locking chamber 340 is for accommodating locking part 320, and it comprises sidewall 341 and roof 342, is formed with circular opening 343 on sidewall 341.With respect to opening 343, at the opposite side of sidewall 341, be formed with square installation 344, for locking part 320 is arranged on to self-locking chamber 340.This locking part 320 comprises and is flat main body 321, can be inserted in self-locking chamber 340 from installing port 344.And a side of corresponding opening 343 autonomous agents 321 of locking part 320 is extended with pivot connector 322, this pivot connector 322 can be inserted in opening 343.The main body 321 of locking part 320 is provided with a perforation axially running through 323 along output shaft 3, for the insertion of tightening member 50, and is provided with tight lock part 324 on 323 the madial wall of boring a hole.When the whole axioversion certain angle of locking part 320, tight lock part 324 can be matched with the outer surface of the auxiliary section 503 of tightening member 50, thereby clamp tightening member 50.

It should be noted that in present embodiment, bore a hole 323 and off-gauge cylindrical shape, but be roughly interior spindle, specifically the radial dimension from two ends to middle part diminishes gradually.Perforation 323 has and is round table-like and symmetrically arranged upper inner surface 325 and lower inner surface 326, and above-mentioned tight lock part 324 is located between upper inner surface 325 and lower inner surface 326 and its inner surface is the smooth face of cylinder.In the main body 321 of locking part 320, with respect to one end of pivot connector 322, also the axial direction along output shaft 3 is provided with two the first grooves 327 side by side.Relative, on the roof 342 in self-locking chamber 340, corresponding the first groove 327 is also provided with 347, two the first elastic components 328 of two the second grooves being inserted in the first groove 327 and the second groove 347 of correspondence respectively.By the first elastic component 328 is set, can make locking part 320 when original state, remain on inclination locked position.

In addition, refer to Fig. 2, Figure 12 and Figure 14, the outside at the sidewall 341 in self-locking chamber 340, is also provided with anti-rotation groove 345.To should anti-rotation groove 345, in the internal chamber 33 of output shaft 3, be also provided with stop pin 37, this stop pin 37 is housed in anti-rotation groove 345 always, the radial rotary in order to restriction from lock set 300.

On output shaft 3, be also provided with a stop part extending in chamber 33, depression bar 310 drives when lock set 300 axially moves down under the effect of operating parts 100, one end of locking part 320 can abut to above-mentioned stop part, and then makes locking part 320 move to the upright position vertical with the longitudinal axis of output shaft 3 by obliquity.Specifically refer to Fig. 2 and Fig. 3, in the present embodiment, above-mentioned stop part is a pin 39.On lower house 32, along the bearing of trend of locking part 320, be provided with an accepting hole 38, above-mentioned pin 39 is arranged in this accepting hole 38.In the axial direction, this pin 39 be positioned at locking part 320 under.

Refer to Fig. 3 to Fig. 9, the quick change clamping device specific operation process of power tool of the present invention is as follows.When this has inserted after tightening member 50 in lock set 300, the bar portion 502 that is tightening member 50 is inserted into after the perforation 323 in locking part 320, as shown in Fig. 4 and Fig. 7, when user by operating parts 100 rotation on the second position of rotation time, the direction away from operating parts 100 moves along the longitudinal axis of output shaft 3 can to make depression bar assembly 200 drive self-locking sleeve pipes 310, now, the main body 321 of locking part 320 and pin 39 produces and contacts and by pin 39 blocks.

As shown in Figure 8, operating parts 100 continues rotation to the 3rd position of rotation, and oppresses depression bar assembly 200 and further axially move down, and then drives from lock set 300 and continue axially to move down; One end of locking part 320 is by pin 39 blocks, 322 of the pivot connectors of the other end continue axially to move down under the drive of self-locking sleeve pipe 310, thereby the whole straight line around the longitudinal axis perpendicular to output shaft 3 rotates to horizontal level, and is upright position state with respect to the longitudinal axis of output shaft 3; Now, between the tight lock part 324 in the perforation 323 of locking part 320 and the auxiliary section 503 of tightening member 50, do not contact, tightening member 50, in being released state, can easily be removed from output shaft 3.

As shown in Figure 3 and Figure 6, and when user rotates back on the first position of rotation by operating parts 100, on depression bar assembly 200 is axial by drive self-locking sleeve pipe 310, move, and further, by connecting between the pivot connector 322 of locking part 320 and the circular open 343 on self-locking chamber 340, locking part 320 is also driven and moved.Simultaneously, owing to being provided with the first elastic component 328 between the other end of locking part 320 and self-locking chamber 340, under the effect of elastic force and the other end of locking part 320 is not produced move, such final result is exactly that locking part 320 returns to the state that is inclination with respect to the longitudinal axis of output shaft 3 in self-locking chamber 340, and and then clamp tightening member 50, and the inclination angle [theta] of locking part 320 horizontal directions is at least 4.7 °.

As shown in figure 11, between tight lock part 324 in perforation 323 and the auxiliary section 503 of tightening member 50, the clamping force of side direction will be produced, meanwhile, the main body 321 of locking part 320 does not produce and contacts with pin 39, thereby the bar portion 502 by tightening member 50 is tightly clamped on locking part 320.It should be noted that herein, the size of this inclination angle [theta] is according to the concrete size of locking part 320 and tightening member 50 and coefficient of friction between the two and fixed, therefore, the size of inclination angle [theta] can be along with the concrete size of locking part 320 and tightening member 50 and the variation of material and is changed.

Otherwise, user rotates operating parts 100 on the 3rd position of rotation time again, the elastic force that depression bar assembly 200 overcomes the second elastic component 220 moves down, drive self-locking sleeve pipe 310 also to move down, make locking part 320 return to level, uninstall the side direction clamping force producing between the tight lock part 324 of locking part 320 and tightening member 50, make the tightening member 50 can free axially-movable, by user's realizing self disassembling.In addition, in operating parts 100 rotation as shown in Figure 4 and Figure 6 to the second position of rotation between the first position of rotation and the 3rd position of rotation, from lock set 300, axially move down a segment distance, the main body 321 of locking part 320 produces and contacts with pin 39, the inclination angle of locking part 320 diminishes, but locking part 320 not yet arrives upright position, now the active force between tightening member 50 and locking part 320 reduces.

By such quick change clamping device, user can only just can be realized and tightening member 50 is mounted to output shaft 3 rapidly or from output shaft 3, tightening member 50 disassembled rapidly by operating operation part 100, thereby can install rapidly or change working head, facility swift to operate and chucking power are strong.Please continue to refer to Fig. 2, this power tool also comprises working head clamping anti-slipping mechanism, for having connected after working head 6 on output shaft 3, prevents because of the installing hole of output shaft 3 and the working head 6 little phenomenon that causes working head 6 to skid of chucking power radially.

See also Figure 15 to Figure 17, this clamping anti-slipping mechanism comprises from the free end of output shaft 3 push rod 400 to downward-extension, be connected to the hollow shaft housing 420 of output shaft end and be housed in above-mentioned axle sleeve 420 and for the hollow holder 410 of installment work head.This holder 410 is set on above-mentioned push rod 400, and is axially provided with the 3rd elastic component 430 between holder 410 and axle sleeve 420, make holder 410 relatively axle sleeve 420 move axially.

Further, push rod 400 ends are extended with the boss 401 of six prism-frustum-shapeds, and the side of boss 401 forms the first inclined-plane 402.410 of holders are as elastic material, and it comprises flange portion 411 and from the ratchet 412 of a side direction downward-extension of flange portion 411, this ratchet 412 is cylindric substantially, and footpath is upwards partitioned into six deciles that size is identical.It is hexagonal installation portion 415 that the end of ratchet 412 is provided with for installment work 6 and cross section, and the inside of ratchet 412 is formed with the host cavity 413 of six prism-frustum-shapeds, and the boss 401 of this host cavity 413 and push rod 400 matches to merge and is set in boss 401 outsides.Wherein, with respect to the first inclined-plane 402 of push rod 400, in the host cavity 413 of holder 410, be formed with the second inclined-plane 414.Axle sleeve 420 has inner face 421, is positioned at pad 450 is also set on inner face 421 along axial direction.Above-mentioned the 3rd elastic component 430 is set on ratchet 412, and its one end contacts with the flange portion 411 of holder 410, and the other end contacts with the pad 450 on the inner face 421 of axle sleeve 420.In addition, flange portion 411 pin 440 by the lower surface 35 of one group of inleakage chamber 33 with from lock set 300 generations, be optionally connected, holder 410 can be moved along axial direction.The bottom of pin 440 is resisted against the upper surface of the flange portion 411 of holder 410, and its top is relative with the bottom of self-locking sleeve pipe 310 from lock set 300.By above structure, thereby can make the outer radial dimension of installation portion 415 of the ratchet 412 of holder 410 change clamping the first radial dimension A of working head 6 and discharge between the second radial dimension B of working head 6.

Please refer to Fig. 3 and Figure 16, when operating parts 100 is positioned on the first position of rotation, from self-locking sleeve pipe 310 and the pin 440 of lock set 300, be disengaged position, and tightening member 50 is clamped.Now, holder 410 is under the effect of the 3rd elastic component 430, its second inclined-plane 411 is close on the first inclined-plane 402 of push rod 400, thereby make the installation portion 415 of the ratchet 412 of holder 410 maintain diametrically maximum outer radial dimension, i.e. the first radial dimension A, and then can apply maximum lateral action power to the installing hole 61 of working head 6, prevent that working head 6 side direction when swinging from skidding.

As shown in Fig. 9 and Figure 17, user, pull operating parts 100 rotations to the 4th position of rotation, depression bar assembly 200 further axially moves down drive from lock set 300.From lock set 300, axially moving down after certain distance, the bottom of its self-locking sleeve pipe 310 will contact with the top of pin 440, and by pin 440, pressure is passed to holder 410, and then drives holder 410 axially to move down.After holder 410 axially moves down, because push rod 400 axially above keeps transfixion, the second inclined-plane 411 of holder 410 will be separated from the first inclined-plane 402 of push rod 400.And, elasticity due to the ratchet 412 self of holder 410, after the second inclined-plane 411 of holder 410 and the first inclined-plane 402 disengagings of push rod 400, ratchet 412 is contracted to original state, the outer radial dimension of the installation portion 415 of ratchet 412 becomes the second minimum radial dimension B, and ratchet 412 is applied to that the lateral action power of installing hole 61 of working head 6 is unloaded immediately to be fallen.Now, first user takes off tightening member 50, then just can like a cork working head 6 be taken off from holder 410.

Otherwise, when user need to reinstall the working head 6 after unloading, only need when operating parts 100 is positioned at the second position of rotation, first working head 6 be mounted to the end of holder 410, then tightening member 50 is inserted in output shafts 3 in lock set 300, and then operating parts 100 is pulled to the first position of rotation, in this process, operating parts 100 is cancelled the active force to depression bar assembly 200, under the effect of the second elastic component 220, depression bar assembly 200 moves to initial position by drive on lock set 300 is axial, and the bottom of self-locking sleeve pipe 310 will be separated gradually with the top of pin 440, 410 of the holders elastic force effect lower shaft at the 3rd elastic component 430 upwards moves, fitted gradually with the first inclined-plane 402 of push rod 400 again in its second inclined-plane 411, the ratchet 412 of holder 410 can strut by the boss 401 by push rod 400 gradually diametrically, thereby the installing hole 61 by 415 pairs of working heads 6 of installation portion applies enough large side direction clamping force and clamps working head 6, and then prevent working head 6 at work and 410 of holders relatively rotate, guarantee that output shaft 3 passes to working head 6 by driving torque better by holder 410, make working head 6 there is higher operating efficiency.

In above-mentioned the first embodiment, the inner surface of the tight lock part 324 of the locking part 320 of quick change clamping device is the smooth face of cylinder, and tightening member 50 has the smooth face of cylinder equally with the auxiliary section 502 that tight lock part 324 connects.Locking part of the present invention is not limited to above-mentioned embodiment with coordinating of tightening member, below in conjunction with Figure 18 to Figure 23, other embodiment of the present invention is further illustrated.

Refer to shown in Figure 18, second embodiment of the invention and above-mentioned the first embodiment structure are basic identical, and difference is only tightening member 51.In present embodiment, tightening member 51 comprises equally tabular pressing plate 511 and from pressing plate 511 center upwardly extending bar portion 512, bar portion 512 ends are provided with the auxiliary section 513 coordinating with the tight lock part 324 of above-mentioned locking part 320 equally.Difference is, auxiliary section 513 offered in a circumferential direction some grooves 514, when tightening member 51 is clamped by the tight lock part 324 of locking part 320, tight lock part 324 is held in groove 513 just.By the auxiliary section 512 at tightening member 51, these grooves 513 are set, can guarantee when clamped position, between tightening member 51 and the tight lock part 324 of locking part 320, have larger axial force, thereby prevent tightening member 51 from skidding and move axially.

Refer to Figure 19, in third embodiment of the invention, be equally tightening member 52 with the first embodiment difference.In present embodiment, tightening member 52 comprises equally tabular pressing plate 521 and from pressing plate 521 center upwardly extending bar portion 522, bar portion 522 ends are provided with the auxiliary section 523 coordinating with the tight lock part 324 of above-mentioned locking part 320 equally.Difference is, the shape of auxiliary section 523 is not cylindrical, but from two ends to the diminishing closing waist shape of mid diameter, can increase equally the axial force between auxiliary section 523 and the tight lock part 324 of locking part 320, thereby prevent tightening member 52 from skidding and move axially.

Refer to Figure 20, in four embodiment of the invention, be equally tightening member 53 with aforementioned embodiments difference.In present embodiment, tightening member 53 comprises equally pressing plate 531 and from pressing plate 531 center upwardly extending bar portion 532, bar portion 532 ends are provided with the auxiliary section 533 coordinating with the tight lock part 324 of above-mentioned locking part 320 equally.Difference is, auxiliary section 533 tip size of tightening member 53 are less, and middle part is that grape wine is barrel-shaped, and this kind of structure can make the bar portion 532 of tightening member more easily insert in the perforation 323 of locking part 320.

Refer to Figure 21, in fifth embodiment of the invention, be equally tightening member 54 with aforementioned embodiments difference.In present embodiment, tightening member 54 comprises equally tabular pressing plate 541 and from pressing plate 541 center upwardly extending bar portion 542, bar portion 542 ends are provided with the auxiliary section 543 coordinating with the tight lock part 324 of above-mentioned locking part 320 equally.Difference is, the auxiliary section 543 of tightening member 54 is roughly truncated cone-shaped, and this kind of structure can increase the axial force between auxiliary section 543 and the tight lock part 324 of locking part 320 equally, prevents that tightening member 54 from skidding and moving axially.

Refer to Figure 22, in sixth embodiment of the invention, tightening member 55 is different from aforementioned embodiments with locking part 320.In present embodiment, tightening member 55 comprises equally tabular pressing plate 551 and from pressing plate 551 center upwardly extending bar portion 552, bar portion 552 ends are provided with the auxiliary section 553 coordinating with the tight lock part 324 of above-mentioned locking part 320 equally.Difference is, the interior table of the outer surface of the auxiliary section 553 of tightening member 55 and the tight lock part 324 of locking part 320 is coated with respectively

frictional layer

554,3241, to increase the clamping force between tight lock part 324 and auxiliary section 553, prevent that tightening member 55 from skidding and moving axially.

Refer to Figure 23 to Figure 25, be respectively the 7th to the 9th embodiment of the present invention.As shown in figure 23, in the 7th embodiment, on the inner surface of the tight lock part 324 of locking part 320, further offer depressed part 3242, to increase the active force between tight lock part 324 and the auxiliary section of tightening member.As shown in figure 24, in the 8th embodiment, the tight lock part 324 of locking part 320 ' the non-smooth face of cylinder of inner surface, but outwardly part spherical; Equally, as shown in figure 25, in the 9th embodiment, the tight lock part 324 of locking part 320 " inner surface be round table-like, tight lock part 324 ' and 324 " all can be with coordinating well between the auxiliary section of tightening member.

In above-mentioned embodiment, show respectively the various structures fit system of the tight lock part of locking part of the present invention and the auxiliary section of tightening member.Except above fit system, on the inner surface of the tight lock part of locking part, can be provided with internal thread, correspondingly, on the outer surface of the auxiliary section of tightening member, be provided with external screw thread, locking part is when inclination locked position, internal thread and external screw thread are matched, thereby make the tight lock part of locking part can stably clamp the auxiliary section of tightening member.

Be appreciated that in the present invention, clamping anti-slipping mechanism is also not limited to the structure adopting in above-mentioned embodiment.As long as holder can be on the longitudinal axis of output shaft pushrod movement relatively, holder is strutted by push rod and have and compared with the first large radial dimension, to clamp working head or contraction, there is the second less radial dimension to discharge working head.Below in conjunction with Figure 26 to Figure 29, respectively the clamping anti-slipping mechanism in tenth embodiment of the invention to the 12 embodiments is described further.

Refer to Figure 26, in tenth embodiment of the invention, the boss 701 of push rod 700 ends is round table-like, rather than six prism-frustum-shapeds.On the sidewall of the lower house 32 of output shaft, offer the interior driving member 703 that partly extends in the axial direction the 3rd groove 702 that is further provided with of the 3rd groove 702, the three grooves 702.In the flange portion 711 of holder 710, the 3rd groove 702 of corresponding lower house 32 is provided with the 4th groove 712, and after assembling, driving member 703 parts stretch in the 4th groove 712.In the first embodiment, the boss 401 of push rod 400 ends is six prism-frustum-shapeds, and the lower house 32 of output shaft passes to holder 410 by boss 401 by moment of torsion.In present embodiment, the lower house 32 of output shaft passes to holder 710 by driving member 703 by moment of torsion.

Refer to Figure 27, in eleventh embodiment of the invention, do not arrange as quick change clamping device, axle sleeve 420 and the 3rd elastic component 430 and pad 450 in the first embodiment.In present embodiment, clamping anti-slipping mechanism only comprises push rod 800 and the elastic clamping pieces 810 of lower house 32 ends that are arranged on output shaft.Push rod 800 ends are provided with truncated cone-shaped boss 801, and the top of push rod 800 is provided with external screw thread 802.Holder 810 comprises flange portion 811 and ratchet 812, is provided with the internal thread 813 that can coordinate with the external screw thread 802 of push rod 800 on the madial wall of holder 810.Holder 810 is coordinated and is connected on push rod 800 with the external screw thread 802 of push rod 800 by internal thread 813,810 of rotary clamps can make holder 810 move up and down along the longitudinal axis of output shaft, thereby make the boss 801 of push rod 800 and 812 cooperations or separated of the ratchet of holder 810, cause ratchet 812 softened or shrink, and then can clamp diametrically or discharge working head (not shown).

Please refer to Figure 28 and Figure 29 below, in twelveth embodiment of the invention, do not arrange as quick change clamping device, the 3rd elastic component 430 and pad 450 in the first embodiment.In present embodiment, clamping anti-slipping mechanism comprise lower house 32 ends that are arranged on output shaft push rod 900, be connected to the axle sleeve 920 of lower house 32 ends and be set in push rod 90 peripheral and be housed in the holder 910 in axle sleeve 920.Wherein, axle sleeve 920 is lower house 32 radial rotatings relatively, the spiral path 922 that axially offers guiding groove 921 on the madial wall of axle sleeve 920 and radially arrange and be communicated with guiding groove 921.Holder 910 comprises flange portion 911 and the ratchet 912 extending from flange portion 911 1 sides, and the lateral wall of ratchet 912 is provided with projection 913.Projection 913 can be housed in guiding groove 921 and track 922, and can be in guiding groove 921 and the interior slip of track 922.

During assembling, first make the projection 913 of holder 910 and the guiding groove 921 of axle sleeve 920 align and axially slip in guiding groove 921, thereby holder 910 is housed in axle sleeve 920.Then the axle sleeve 920 that carries holder 910 is connected to the free end of lower house 32, now the madial wall of holder 910 can coordinate with the prism-frustum-shaped boss 901 of push rod 900, and the radial rotary of holder 910 is limited by boss 901.Then, working head (not shown) is arranged on the ratchet 912 of holder 910, then axle sleeve 920 turns clockwise, thereby make the projection 913 of holder 910 in the interior slip of track 922 of axle sleeve 920, impel holder 910 to move on axially simultaneously, and then holder 910 is coordinated and softened with the boss 901 of push rod 900, thereby the radial dimension of the ratchet 912 of holder 910 is increased and clamp diametrically working head.Obviously, after working head is by radial clamping, then axle sleeve 920 is rotated counterclockwise, 910 of holders are driven by axle sleeve 920 and axially move down and separated with push rod 900, thereby make the radial dimension of ratchet 912 diminish to discharge working head.

Claims

1. a power tool, comprise head capsule, the output shaft extending in described head capsule, be arranged on the free-ended holder of output shaft and be arranged on the working head on described holder, described output shaft drives described working head to move by holder, it is characterized in that: the free end of described output shaft is provided with the push rod extending in described holder, described holder operationally moves between primary importance and the second place along the relatively described push rod of longitudinal axis of described output shaft, when primary importance, described holder has the first radial dimension to clamp described working head, when the second place, described holder has the second radial dimension to discharge described working head, described the first radial dimension is greater than described the second radial dimension.

2. power tool as claimed in claim 1, it is characterized in that: the end of described push rod is provided with boss, the side of described boss forms the first inclined-plane, described holder is provided with the ratchet that is set in described boss periphery, and the inside of described ratchet is formed with second inclined-plane that can coordinate with described the first inclined-plane.

3. power tool as claimed in claim 2, is characterized in that: described boss is terrace with edge shape.

4. power tool as claimed in claim 2, is characterized in that: described boss is truncated cone-shaped.

5. power tool as claimed in claim 4, is characterized in that: between described output shaft and described holder, be provided with driving member, described output shaft passes to described holder by described driving member by moment of torsion.

6. power tool as claimed in claim 1, it is characterized in that: described power tool further comprises free-ended axle sleeve and the quick change clamping device that is arranged on described output shaft, described holder be housed in described axle sleeve and and described axle sleeve between be provided with in the axial direction elastic component, under the effect of described elastic component, described holder, in clamping the primary importance of described working head, operates described quick change clamping device and can make described holder by primary importance, be moved to the second place that discharges described working head.

7. power tool as claimed in claim 6, it is characterized in that: described quick change clamping device comprises operating parts, be arranged on depression bar assembly in described output shaft be connected with depression bar assembly from lock set, describedly between lock set and described holder, be provided with pin, operate described operating parts and can drive by described depression bar assembly that the longitudinal axis along described output shaft moves from lock set, describedly from lock set and then by described pin, drive described holder to move along the longitudinal axis of described output shaft.

8. power tool as claimed in claim 1, is characterized in that: described holder is threaded in the free end of described output shaft, rotates described holder and can make it longitudinal axis along described output shaft moves relative to described push rod.

9. power tool as claimed in claim 1, it is characterized in that: described power tool further comprises and is arranged on the free end of described output shaft the axle sleeve that can rotate relative to described output shaft, described holder is housed in described axle sleeve, the madial wall of described axle sleeve is provided with spiral yarn shaped track, described holder is provided with the projection in the track that can be housed in described axle sleeve, rotate described axle sleeve and can make the projection of described holder slide in the track of described axle sleeve, thereby drive described holder to move along the longitudinal axis of described output shaft.

10. power tool as claimed in claim 1, is characterized in that: described holder comprises flange portion and the ratchet extending from flange portion one side, and the end of described ratchet is formed with the installation portion that described working head can be installed.