CN102909677A

CN102909677A - Power tool

Info

Publication number: CN102909677A
Application number: CN2012102525912A
Authority: CN
Inventors: 张士松; 钟红风; 庞晓丽; 徐静涛; 保罗·安德罗
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Positec Power Tools Suzhou Co Ltd
Priority date: 2011-08-06
Filing date: 2012-07-20
Publication date: 2013-02-06
Anticipated expiration: 2032-07-20
Also published as: CN202702200U; CN102909679A; CN102909710A; CN102909710B; CN102909702A; CN102909676B; CN104476472B; CN102909676A; CN202702201U; CN104385205B; CN104476472A; CN102909703A; CN102909702B; CN102909677B; CN102909701B; CN102909709A; CN104385206A; CN202702199U; CN102909701A; CN102909709B

Abstract

The invention relates to a power tool. The power tool comprises a case, a motor, an output shaft, a transmission mechanism, a holder and a spindle, wherein the motor is arranged in the case and outputs rotation power; the output shaft is provided with a housing hole which is axially formed and is used for containing a working head; the transmission mechanism is arranged between the motor and the output shaft and can transmit the rotation power output by the motor to the output shaft; the holder is arranged in the case and comprises housing bins for housing a plurality of parallel working heads; the spindle can axially move between a working position which passes through the housing bins, is connected with one of the working heads in a matching manner and enables one of the working heads to be in the housing hole and a release position separated from one of the working heads; the power tool also comprises an operating part movably connected on the case; the operating part can move between the two positions; in a first position, the spindle is in the working position, and the operating part pushes against the case and covers a part of the holder; and in a second position, the spindle is in the release position, and the operating part is spaced with the case and is exposed out of a part of the holder.

Description

Power tool

Technical field

The present invention relates to a kind of power tool, relate in particular to a kind of storage and quick-replaceable drill gun class power tool of realizing working head.

Background technology

In existing drill gun class power tool, generally include electric drill, electric screw driver and percussion drill.

Electric screw driver is for a kind of commonly used electric tool of screw-driving to the workpiece.When needing in the use procedure to tighten the screw of different size, change different working heads according to the difference of screw specification, namely screwdriver bit namely will take off the working head of original installation, then loads onto the working head of another kind of structure.Under the use occasion that needs the frequent working head, brought great inconvenience to the operator, caused the replacing working head loaded down with trivial details on the one hand, the working head that takes off is on the other hand placed easily everywhere and is lost.Although, some storage that can realize working head and quick-replaceables are arranged, because the inherent defect of hand-operated tools in some hand-operated tools, be that moment of torsion is little, operation is hard, so that the operator is easy to fatigue, cause inefficiency, be not suitable in industrial sector, using as professional instrument.

Chinese utility model patent CN201086280Y has disclosed a kind of Multi-tool head electric tool, comprise power tool body and multi-knife-head rotaring wheel structure, the multi-knife-head rotaring wheel structure comprises the multi-knife-head runner cylinder that can accommodate a plurality of cutter heads, multi-knife-head runner cylinder can link to each other with tool body in axial sliding, when multi-knife-head runner cylinder slides into position away from tool body, thereby can select the cutter head that needs by rotation multi-knife-head runner cylinder.But at multi-knife-head runner cylinder during away from tool body, its main shaft is exposed, dust, powder can enter the inside of electric tool inside or multi-knife-head runner cylinder in the process that multi-knife-head runner cylinder slides, time has been grown and can cause multi-knife-head runner cylinder to rotate to carry out cutter head to select, and perhaps directly causes electric tool to use.And work time working head be to be against on the workpiece, main shaft need to bear reciprocal active force like this, thus main shaft can bring the pressure transmission mechanism not to be delivered to main shaft to moment of torsion to transmission mechanism.

In addition; because electric tool randomness in use; therefore when shutting down on the main shaft angle of the barrel of installment work head be uncertain; and working head to return the angle of runner cylinder also be uncertain; so in the process of changing working head; just might there be the angle of barrel of main shaft and the dislocation of working head angle, cause working head can't enter correctly, smoothly the situation of main shaft.Chinese utility model patent CN201086280Y has disclosed multi-knife-head runner cylinder and switch gearing, when multi-knife-head runner cylinder slides into position away from tool body, thereby can select the cutter head that needs by rotation multi-knife-head runner cylinder; When tool body was got back in the slip of multi-knife-head runner cylinder, it drove gangbar and moves, and gangbar can press switch and make machine operation, rotates a certain angle sleeve angle is matched with cutter head angle.On the one hand, regular in short-term starter motor causes electrical machinery life to shorten or damage easily; The angle that staggers between sleeve and the cutter head on the other hand generally can be very not large, the handle of cutter head is hexagonal generally speaking, the angle that all the other and sleeve stagger can not surpass 60 degree, the multi-turn and even electric motor micro-motion once also will take a turn for the better, if the motor rotation is not in place, not only cutter head can't enter sleeve accurately, smoothly, also might cause the damage of motor or cutter head.

And, when changing cutter head, need first cutter head to be retracted into the runner cylinder, cutter head is held by magnet and leaves from the runner cylinder when preventing that the runner cylinder from moving axially, Chinese utility model patent CN201086280Y has disclosed it and has thrown off to prevent cutter head and runner cylinder by the mode that retainer ring is set at cutter head, it is customized especially that but such cutter head needs, so that the use of instrument does not have versatility.And directly more unstable by main shaft band dynamic cutter head speed ratio, because the length of main shaft is longer, beating of main shaft is just larger, gives the user of instrument with serving potential danger.Moreover, because need to moving axially with main shaft, separates by the runner cylinder, be easy to enter dust and other impurities and can't clean.

Summary of the invention

For the deficiencies in the prior art, the object of the present invention is to provide a kind of power tool of easy to operate and good airproof performance.

The technical solution adopted for the present invention to solve the technical problems is: a kind of power tool comprises: casing; Motor is arranged in the casing, and outputting rotary power; Output shaft has the accepting hole that holds working head of axial setting; Transmission mechanism is arranged between motor and the output shaft and also the rotary power of motor output can be passed to output shaft; The storage folder is arranged in the casing, and described storage folder comprises be used to the storehouse of accommodating of accommodating several working heads that are set up in parallel; Main shaft, described main shaft can pass accommodate one of storehouse and several working heads connect and make one of several working heads in accepting hole the operating position and the off-position that separates with one of described several working heads between axially-movable; Described power tool also comprises the operating parts that is movably connected on the casing, described operating parts can move between the two positions, in primary importance, described main shaft is in the operating position, described operating parts and casing butt also cover the part that described storage is pressed from both sides, in the second place, described main shaft is in the off-position, and described operating parts and casing gap arrange and expose the part of described storage folder.

Preferably, described operating parts and casing the two one of upper be axially arranged with gathering sill along main shaft, the two another one of described operating parts and casing is provided with the guide rail that matches with gathering sill, described operating parts slide in gathering sill by described guide rail and with respect to casing along the main shaft axially-movable.

Preferably, described operating parts drives described main shaft axially-movable.

Preferably, described casing axially can be divided into the motor part that is provided with motor along main shaft, is provided with the driving section of transmission mechanism, is provided with the storage part of storage folder, and when described main shaft was in the operating position, described operating parts was axially overlapping with described driving section and storage part; When described main shaft was in the off-position, described operating parts was axially overlapping with described motor part, overlaps with described driving section.

Preferably, but an end of described main shaft and being connected of described transmission mechanism transmitting torque, and the other end of described main shaft can be connected with described output shaft and drive the working head rotation by output shaft.

Preferably, be provided with gear-box in the described casing, described transmission mechanism is housed in the described gear-box, is provided with toothed wheel box cover plate between described gear-box and the storage folder.

Preferably, rotatable being supported between casing and the toothed wheel box cover plate of described storage folder.

Preferably, described transmission mechanism comprises the planetary gear reducing mechanism that links to each other with motor and the pinion gear mechanism that links to each other with described main shaft, is provided with the dividing plate between described planetary gear reducing mechanism and described pinion gear mechanism in the described gear-box.

Preferably, described pinion gear mechanism comprises the second gear that the first gear that is connected with described planetary gear reducing mechanism, the 3rd gear that is connected with described main shaft and while and the first gear and the 3rd gear mesh.

Preferably, described casing top is provided with opened portion, and the part of described storage folder is exposed from described opened portion.

Compared with prior art, the invention has the beneficial effects as follows: power tool of the present invention is effectively sealing in the course of the work, and has also realized the movement of operation axis by operating parts, and is easy to operate.

Description of drawings

Fig. 1 is the cutaway view of the power tool in preferred embodiment for the present invention when in running order.

Fig. 2 is that the power tool among Fig. 1 is in the cutaway view when changing the working head state.

Fig. 3 is the part three-dimensional exploded view of Fig. 1 medium power instrument.

Fig. 4 is the stereogram of Fig. 1 medium power instrument running part.

Fig. 5 is the stereogram of the slip lid of Fig. 1 medium power instrument.

Fig. 6 is the schematic diagram of position-limit mechanism first embodiment of Fig. 1 medium power instrument, and this moment, position-limit mechanism was in the lock state.

Fig. 7 is similar to Fig. 6, and wherein position-limit mechanism is in released state.

Fig. 8 is the schematic diagram of position-limit mechanism second embodiment of Fig. 1 medium power instrument, and this moment, position-limit mechanism was in the lock state.

Fig. 9 is similar to Fig. 8, and wherein position-limit mechanism is in released state.

Figure 10 is the schematic diagram of position-limit mechanism the 3rd embodiment of Fig. 1 medium power instrument, and this moment, position-limit mechanism was in the lock state.

Figure 11 is similar to FIG. 10, and wherein position-limit mechanism is in released state.

The schematic diagram of the first embodiment that the restriction working head retreated when Figure 12 was Fig. 2 medium power tool changing working head.

Figure 13 is the schematic diagram that block piece is in primary importance among Figure 12.

Figure 14 is the schematic diagram that block piece is in the second place among Figure 12.

The schematic diagram of the second embodiment that the restriction working head retreated when Figure 15 was Fig. 2 medium power tool changing working head.

Figure 16 is the schematic diagram that block piece is in primary importance among Figure 15.

Figure 17 is the schematic diagram that block piece is in the second place among Figure 15

Figure 18 is the schematic diagram of the first embodiment of the output shaft of Fig. 1 medium power instrument.

Figure 19 is the front view of the output shaft of Figure 18 medium power instrument.

Figure 20 is the schematic diagram of the second embodiment of the output shaft of Fig. 1 medium power instrument.

Figure 21 is the front view of the output shaft of Figure 20 medium power instrument.

Figure 22 is the schematic diagram of the 3rd embodiment of the output shaft of Fig. 1 medium power instrument.

Figure 23 is the front view of the output shaft of Figure 22 medium power instrument.

Wherein,

1. casing 2. motors 3. transmission mechanisms

4. output shaft 5. Working head quick-changing mechanisms 6. batteries

7. press button 8,8a, 8b. position-limit mechanism 9. working heads

11. handle 13. fore shells 15. gathering sills

21. motor shaft 22. gear-boxes 30. pinion gear mechanisms

31. planetary gear reducing mechanism 40. sleeves 41. through holes

42. radial protrusion 43. interior step 45. deep gouges

50. fixed block 51. main shafts 52. storage folders

53. slip lid 54. steel cap 56.U type springs

57.

shell fragment

81,81a, 81b.

limited block

82,82a. bearing pin

83. torsion spring 83b. spring 131. perforates

221. dividing plate 223. toothed wheel box cover plates 225. arched members

301. the first gear 302. second gears 303. the 3rd gear

411. 412. sides, bottom surface, 413. sides

421. inclined-plane 511. magnet, 512. annular grooves

521. working head is accommodated storehouse 522. pressing plates, 523. openings

526.U type groove 532. is separated lock dog 533. inclined-planes

535. the first projection 536. second projections 537. tread plates

571. elasticated end 813. sides

The specific embodiment

In the preferred embodiment of power tool of the present invention, power tool is powered screwdriver, difference according to power source can be divided into pneumatic screw driver, screwdriver and electric screw driver surge, direct current and dividing of exchanging are also arranged in the electric screw driver, and the present invention preferably is specifically described as an example of DC electric screwdriver example.

Referring to figs. 1 through shown in Figure 3, this DC electric screwdriver comprises casing 1, motor 2, battery 6, transmission mechanism 3, Working head quick-changing mechanism 5 and output shaft 4.Casing 1 is closed up by screw (not shown) by symmetrical two and half housings and assembles, it has horizontal component and is handle 11 parts that angle K arranges with horizontal component, to between 130 degree, meeting was pleasant when gripping handle 11 operated like this at 100 degree for the preferred angle K of the present invention.Top in handle 11 parts is provided with press button 7, and battery 6 is fixed on the bottom of casing 2 handles 11 parts, and transmission mechanism 3 partial fixings are housed in the horizontal component of casing 1.As preferred embodiment, this battery 6 can be lithium ion battery.Need to prove that said lithium ion battery is that negative material is the general name of the rechargeable battery of elemental lithium here, according to the difference of positive electrode, it can consist of many systems, such as " lithium manganese " battery, and " lithium iron " battery etc.In the present embodiment, lithium ion battery is a joint 3.6V(volt) lithium ion battery.Certainly, battery 6 also can be the battery types well known to those skilled in the art such as NI-G, ni-mh.

Transmission mechanism 3 by before backward (take the right side of drawing for after) comprise planetary gear reducing mechanism 31 and pinion gear mechanism 30 by motor 2 drivings, wherein pinion gear mechanism 30 links to each other with Working head quick-changing mechanism 5, and by Working head quick-changing mechanism 5 rotatablely moving of motor 2 is passed to output shaft 4.Wherein Working head quick-changing mechanism 5 comprises be used to the storage folder of storing different working heads, the working head here refers to that mainly electric screw driver commonly used crosspoint tip screwdriver head, flat blade screwdriver are first-class, by arrange Working head quick-changing mechanism 5 can be when electric screw driver be tightened or unclamp different screws the different working head of quick-replaceable.

According to the composition of above electric screw driver, electric screw driver can be successively by before backward (take the right side of drawing for after) be divided into the motor part D that motor is set, the driving section C of transmission mechanism 3 is set, the storage part B that storage presss from both sides and the efferent A that output shaft is set are set.

Motor in the preferred embodiment for the present invention is motor 2, and motor 2 has from electric machine casing extended motor shaft 21 forward.Motor 2 is fixed in the casing 1, and a gear-box 22 is fixed in the casing 1 and is positioned at the front portion of motor 2, and gear-box 22 is used for accommodating planetary gear reducing mechanism 31 and pinion gear mechanism 30.Wherein planetary gear reducing mechanism 31 has three grades of deceleration systems, and motor shaft 21 extends and planetary gear reducing mechanism 31 engagements, and planetary gear reducing mechanism 31 will rotatablely move and pass to pinion gear mechanism 30.When motor 2 moves like this, by planetary gear reducing mechanism 31, pinion gear mechanism 30, finally by output shaft 4 outputs.In the present embodiment, reducing gear consists of the output speed that obtains to want by three grades of deceleration systems, in other embodiments, and depending on the rotating speed of required output, reducing gear can include only one-level or double reduction system, also can comprise more multi-stage speed-reducing system.

Pinion gear mechanism 30 also is housed in gear-box interior 22, by the two being separated in that dividing plate 33 is set between planetary gear reducing mechanism 31 and pinion gear mechanism 30, and toothed wheel box cover plate 223 is set between gear-box 22 and the Working head quick-changing mechanism 5, transmission mechanism 3 and storage folder 52 can be separated like this, namely transmission mechanism 3 and storage folder 52 are separate.But pinion gear mechanism 30 comprises the first gear 301 that is connected with planetary gear reducing mechanism 31 transmitting torques, the 3rd gear 303 that is connected with Working head quick-changing mechanism 5 and the second gear 302 that meshes with the first gear 301 and the 3rd gear 303, the second gear 302 passes to the 3rd gear 303 with the rotation of the first gear 301, and the two ends of each gear are supported by axle sleeve.The middle part of dividing plate 221 is provided with the hole that the axle for the first gear 301 passes, the end face of dividing plate 221 is provided with for the groove that axle sleeve is installed, the rear axle housing that supports pinion gear mechanism 30 is fixed on the dividing plate 221, front shaft sleeve is fixed on the toothed wheel box cover plate 223, toothed wheel box cover plate 223 can be fixedly linked by screw, buckle etc. with gear-box 22, so, namely can separate pinion gear mechanism 30 and planetary gear reducing mechanism 31, both can be sealed again simultaneously, prevent that dust, powder etc. from entering transmission mechanism 3 inside, also can prevent the leakage of lubricating oil.In addition, it is just compacter for the inner space that makes instrument that three gears are set, thereby do not affect the attractive in appearance of outside.Certainly, also can be arranged to as required two gears, one links to each other with planetary gear reducing mechanism 31, and another links to each other with fast exchanging mechanism for clamping head 5.In addition, transmission mechanism 3 is not limited to above-described form, and transmission mechanism 3 can include only planetary gear reducing mechanism 31, perhaps includes only pinion gear mechanism 30, and perhaps other the transmission mechanism that rotatablely moves is such as ratchet mechanism, turbine mechanism etc.

Working head quick-changing mechanism 5, be connected between output shaft 4 and the pinion gear mechanism 30, but comprise that the main shaft 51, working head storage folder 52 and the operation axis 51 that are connected with the 3rd gear 303 transmitting torques move axially to pass or leave the slip lid 53 of working head storage folder 52.Main shaft 51 can be connected and drive output shaft 4 rotations with output shaft 4, be connected with fore shell 13 on the casing 1, and the part of working head storage folder 52 is housed in the fore shell 13, and another part is covered by slip lid 53 and exposes along with moving of slip lid 53.The present invention preferably stores folder 52 for cylindric, convenient rotation, and it is little to take up room simultaneously, can certainly be arranged to square or leg-of-mutton etc.In electric screw driver work, slip lid 53 and fore shell 13 butts can all be closed working head storage folder 52 with main shaft 51 like this.The position of corresponding main shaft 51 is provided with the hole of passing for main shaft 51 on the toothed wheel box cover plate 223, around main shaft 51 Axis Extensions arched member 225 is arranged on the gear-box 22, arched member 225 can be wholely set with gear-box 22, also can divide and be arranged, can main shaft 51 is partially enclosed by arched member 225 is set, electric screw driver change working head 9 the time, be that the position that slip lid 53 moves to rearmost end also can be exposed out main shaft 51, can prevent like this inside of the entering tools such as dust, powder.And toothed wheel box cover plate 223 extends to the end face of arched member 225, thereby vertically with transmission mechanism 3 integrally closeds together.In the course of the work, slip lid 53 can be closed working head storage folder 52, thereby prevent that dust from entering, when needs are changed working head, remove slip lid 53 and can expose working head storage folder 52, the different working head of convenient selection, so just need slip lid 53 to have certain length, when slip lid 53 moves to operating position with fore shell 13 butts, slip lid 53 and storage part B and driving section C axial overlap, when slip lid 53 moves to the position of replaceable working head, slip lid 53 and motor part D axial overlap, and overlapping with driving section C section axial.Certainly, the mode that slip lid 53 moves is a lot of in addition, such as slip lid 53 rotatable being installed on the casing 1, covering storage folder 52 and is exposing between two positions of storing folder 52 and rotate; Perhaps be similar to the mode of sliding door, can open or closure; Or the mode of the window that is connected in casing 1 that pivots etc., will store folder 52 sealings in the time of can realizing work, will store folder 52 when needing to change working head and expose.

Output shaft 4 is form of sleeve, but installment work 9 in it, and can drive working head 9 rotations, the present invention inserts output shaft 4 by main shaft 51 and drives output shaft 4 rotations, and then will rotatablely move by the mode that output shaft 4 drives working heads 9 rotations and pass to working head 9, working head 9 that like this can Application standard, and need not to offer the hole of accommodating working head 9 at main shaft 51, the weight and volume of the excessive increase complete machine of main shaft 51 diameters avoided.Output shaft 4 is supported on by a sleeve 40 in the axial aperture 131 of fore shell 13, and sleeve 40 is fixed in the perforate 131 of fore shell 13, radial support and axial location is provided for output shaft 4.Like this, directly drive the output shaft that is of working head 9 rotations, shortened the distance of torque transfer, thereby the use of instrument is more reliable.The above-described mode that indirectly drives the working head rotation for main shaft by output shaft, but, those skilled in the art are easy to expect that other transmission means substitutes, and directly drive the working head rotation such as main shaft, but namely main shaft are connected with the mode of working head with transmitting torque directly.

Fig. 1 cooperates with reference to shown in Figure 5 to Fig. 3, and main shaft 51 is six square shafts, on the main shaft 51 axial restraint be provided with a fixed block 50, the rear end of main shaft 51 is rotating to be against on the fixed block 50, slip lid 53 can drive main shaft 51 and move by the mode that links to each other with fixed block 50.The inside of slip lid 53 is provided with the first projection 535 and the second projection 536 along main shaft 51 axially spaced-aparts, duty at electric screw driver, the first projection 535 has apart from S with fixed block 50 axially spaced-aparts, when slip lid 53 slides backward, namely slide towards the direction of motor 2, slided apart from after the S, the first projection 535 and fixed block 50 axial butts, axially mobile backward thereby slip lid 53 drive fixed blocks 50 drive main shaft 51 then; State at the replaceable working head of electric screw driver, the second projection 536 has apart from S with fixed block 50 axially spaced-aparts, when slip lid 53 to front slide, namely slide towards the direction of output shaft 4, slided apart from after the S, the second projection 536 and fixed block 50 axial butts axially moves forward thereby slip lid 53 drive fixed blocks 50 drive main shaft 51 then.Certainly, the mode that slip lid 53 drive main shafts 51 move also has a lot, as can annular groove around week Monday outside it being set at main shaft 51, slip lid 53 extend in the annular groove by a pin or steel wire ring and links to each other with main shaft 51, so neither affect the rotation of main shaft 51, also do not affect the movement that slip lid 53 drives main shaft 51.

The edge of slip lid 53 is provided with guide rail 531, and corresponding casing 1 is provided with gathering sill 15, and slip lid 53 is installed in the gathering sill 15 and can slides vertically with respect to casing 1 by its guide rail 531.Certainly, also can be on the slip lid 53 gathering sill to be set, arrange on the casing 1 guide rail mode so that slip lid move.In addition, the both sides of slip lid 53 outsides are provided with recessed or protruding tread plate 537, block can prevent from skidding when slip lid 53 moves at operator's finger.

Working head storage folder 52 rotatable being supported between toothed wheel box cover plate 223 and the fore shell 13, be evenly distributed with a plurality of working heads along its circumferencial direction on the working head storage folder 52 and accommodate storehouse 521, working head is accommodated storehouse 521 along the 52 axially part sealings of working head storage folder, part excircle opens wide, can be easy to see from the part of opening wide the shape of working head 9 heads when the handled easily person selects working head 9 like this, thus the working head 9 that quick selection needs.Certainly, those skilled in the art are easy to expect that it also can be totally enclosed that working head is accommodated storehouse 521, only need identify in the position of correspondence, perhaps directly working head storage folder 52 are made transparently, can conveniently identify.In addition, can between working head storage folder 52 and toothed wheel box cover plate 223, carry out the elasticity location, namely in the position that working head storage folder 52 is faced corresponding working head 9 on the end face of toothed wheel box cover plate 223 groove is set, the steel cap that compressed by spring is set on the toothed wheel box cover plate 223, perhaps shell fragment, so, working head storage folder 52 whenever turns over a working head 9 and all can send the voice prompt that steel cap or shell fragment fall into groove, thereby convenient operator selects working head 9, and because these positions pre-set, can avoid angle and the main shaft 51 of 52 rotations of working head storage folder to stagger.Foregoing is to select different working heads by the mode that the storage folder rotates, and can certainly by the mode of storage intermediate straight line motion, along radially being arranged side by side that storage is pressed from both sides, just need radially to promote to store folder such as working head when selecting working head.The storage folder is axial restraint in the preferred embodiment of the present invention in addition, enter output shaft by the moving working head of main shaft Axially moving belt and carry out work, can certainly be arranged to the main shaft axial restraint, move axially the mode of rotating again or moving radially to select working head by the storage folder, thereby also can realize to take off the quick-replaceable that working head just can be realized working head.

The front end of main shaft 51 is provided with magnet 511, be used for absorption working head 9, when selecting good berth head 9, can operate slip lid 53 drives main shafts 51 and passes the working head of accommodating this working head 9 and accommodate storehouse 521, working head 9 is by magnet 511 absorption on the main shaft 51, and under the promotion of main shaft 51, leave working head and accommodate storehouse 521, enter output shaft 4.In the time of work, main shaft 51 drives output shaft 4 rotations, and output shaft 4 drives working head 9 rotations.

Electric screw driver need to axially be pressed on working head 9 on screw or the workpiece when operating, 9 of work can be subject to a reverse responsive to axial force like this, can produce main shaft 51 after move, the present invention has proposed three kinds of solutions for addressing this problem, and below describes respectively.

To shown in Figure 7, the place that fixed block 50 is closed in the rear end of main shaft 51 is provided with the position-limit mechanism 8 that prevents that main shaft 51 from retreating with reference to Fig. 4, and position-limit mechanism 8 comprises pivotable limited block 81, along the torsion spring 83 of limited block 81 pivotal orientation bias voltage limited blocks 81.Wherein an end of limited block 81 props up fixed block 50, and the other end is installed on the gear-box 22 by a bearing pin 82 or on the casing 1, the axis of bearing pin 82 is parallel to the axis of main shaft 51, and limited block 81 can rotate in the certain angle scope around bearing pin 82.One end of torsion spring 83 is fixed on the limited block 81, and the other end is against on the gear-box 22 or on the casing 1, the primary importance (Fig. 4 and shown in Figure 6) that the elastic force of torsion spring 83 remains on limited block 81 to offset with fixed block 50.Such position-limit mechanism 8 preferably arranges two, and is symmetrical along the axis of main shaft 51, can keep stress balance like this, makes the axial limiting of main shaft 51 more reliable.When the mobile main shaft 51 of needs, namely can remove the restriction that main shaft 51 is moved by slip slip lid 53.Slip lid 53 inside are provided with the solution lock dog 532 that matches with limited block 81, separate lock dog 532 and be provided with inclined-plane 533, when slip lid 53 moves backward, inclined-plane 533 contacts with a side 813 of limited block 81, and limited block 81 overcomes the elastic force effect of torsion spring 83 around bearing pin 82 rotations under the drive on inclined-plane 533, until limited block 81 is thrown off with fixed block 50, fixed block 50 is unlocked, thereby limited block 81 is in the second place (shown in Figure 7) that allows main shaft 51 axially-movables.Main shaft 51 continues to move axially, and limited block 81 is stuck in the two ends of fixed block 50, and just can change working head this moment.The movement of satisfying slip lid 53 apart from S this shows that first sliding distance S is the restriction of removing 81 pairs of main shaft 51 axially-movables of limited block before slip lid 53 drives main shafts 51 and moves, so as long as can be removed the locking of 81 pairs of main shaft 51 axially-movables of limited block.After working head is more finished changing, slip lid 53 reaches, driving main shaft 51 and fixed block 50 also moves forward, inclined-plane 533 on the solution lock dog 532 again contacts with the side 813 of limited block 81 and separates along with the reach of slip lid 53, limited block 81 comes back to the position that axially offsets with fixed block 50 under the effect of torsion spring 83, like this when electric screw driver work, main shaft 51 front ends stretch into output shaft 4,50 limited 81 of fixed blocks that are located at main shaft 51 rear ends axially prop up, the axially-movable of main shaft 51 is limited like this, be that main shaft 51 can't retreat, thereby the use of electric screw driver is more reliable.

With reference to Fig. 8 and shown in Figure 9, the second embodiment for position-limit mechanism 8, different from above-mentioned position-limit mechanism 8 is, the axis of bearing pin 82a is perpendicular to the axis of main shaft 51, an end and the bearing pin 82a of limited block 81a are pivotally connected, and the other end forms hook-shaped, collude on fixed block 50, fixed block 50 also can be limited to move backward like this, thereby limited block 81a is in the primary importance (shown in Figure 8) of locking main shaft 51 axially-movables.Slip lid 53 moves its inclined-plane 533 of separating on the lock dog 532 is contacted with limited block 81a, limited block 81a under the guiding on inclined-plane 533 around bearing pin 82a rotation and remove locking to fixed block 50, thereby limited block 81a is in the second place (shown in Figure 9) that allows main shaft 51 axially-movables.The action principle of position-limit mechanism 8a is identical with the first embodiment in the present embodiment, repeats no more here.

With reference to Figure 10 and shown in Figure 11, the third embodiment for position-limit mechanism 8, position-limit mechanism 8b comprises limited block 81b and spring 83b, limited block 81b is with respect to casing 1 axial restraint, limited block 81b can be along the direction rectilinear motion perpendicular to main shaft 51 axis, the end of spring 83b is housed in the limited block 81b, and the other end links to each other with casing 1 or gear-box 22, and spring 83b bias voltage limited block 81b makes the primary importance (shown in Figure 10) that it remains on axially and fixed block 50 offsets.In the present embodiment, also be to interact to remove locking to fixed block 50 axially-movables by being arranged on inclined-plane 533 and limited block 81b in the slip lid 53, the elastic force that limited block 81b overcomes spring 83b is linearly moved to the second place (shown in Figure 11) of removing main shaft 51 lockings.The incline direction on the inclined-plane 533 here can be selected according to the direction of limited block 81b motion, and along the horizontal motion perpendicular to main shaft 51 axis, inclined-plane 533 tilts with respect to the direction of main shaft 51 axis and the plane of vertical direction formation such as limited block 81b; Limited block 81b moves along the vertical direction perpendicular to main shaft 51 axis, and inclined-plane 533 tilts with respect to the direction of main-shaft axis and the plane of horizontal direction formation; Limited block 81b moves along the direction that is angle with horizontal direction perpendicular to main shaft 51 axis, limited block 81b has along the component on level and the vertical both direction like this, so the incline direction on inclined-plane 533 can have a plurality of selections, those skilled in the art can expect easily, repeat no more here.

Three kinds of embodiments of above-described position-limit mechanism 8, all are lockings of moving to remove 81 pairs of main shaft 51 axially-movables of limited block by slip lid 53, because slip lid 53 also will drive main shaft 51 and move axially, so just need a first mobile segment distance of slip lid 53, namely remove first the locking of 81 pairs of main shaft 51 axially-movables of limited block, could drive main shaft 51 moves axially again, slip lid 53 is inner to drive the first projection 535 and fixed block 50 axially spaced-apart settings that main shafts 51 move, and the radially overlapping ultimate range of the angle of inclination that the distance of axially spaced-apart can be by inclined-plane 533 and limited block 81 and fixed block 50 is determined.Certainly, those skilled in the art are easy to also expect that the mode that need not to move by slip lid 53 also can realize removing the locking of 81 pairs of main shaft 51 axially-movables of limited block, such as the knob that links to each other with limited block 81 in casing 1 outer setting, drive limited block 81 by the rotation knob and overcome spring force rotation or mobile; The toggle or the button that perhaps link to each other with limited block 81 in casing 1 outer setting, also can drive limited block 81 and overcome spring force rotation or mobile etc. by promoting toggle or pressing button, can realize removing the locking of 81 pairs of main shaft 51 axially-movables of limited block.

In addition, can between slip lid 53 and casing 1 or gear-box 22, flexible member be set, can be blocked by the snap close on the casing 1 when slip lid 53 retreats into terminal position, when slip lid 53 is released, can under elastic force, automatically return to the position of duty.

In the work of needs electric screw driver, main shaft 51 moves forward under the drive of slip lid 53, the working head that promotes to have selected enters output shaft 4, when needs are changed working head, main shaft 51 retreats under the drive of slip lid 53, because the end that main shaft 51 contacts with working head is provided with magnet 511, so getting back to the working head of working head storage folder 52, main shaft 51 meeting drive working heads accommodate in the storehouse 521.And if main shaft 51 moves after continuing, can drive working head and accommodate in the storehouse 521 out from working head, cause changing working head, rotary work head storage folder is 52 o'clock if the operator does not find, probably causes the damage of instrument.The present invention has proposed two kinds of solutions for addressing this problem, and below describes respectively.

With reference to Fig. 3 and Figure 12 to shown in Figure 14, the first embodiment that retreats with main shaft 51 for the restriction working head.The end that working head storage folder 52 is faced gear-box 22 is provided with pressing plate 522, and pressing plate 522 can be along with the 52 together rotations of working head storage folder, and pressing plate 522 can press from both sides 52 integral type settings with the working head storage, also can divide and be arranged, present embodiment is preferably and minute is arranged, both convenient processing, also easily assembling.The position that pressing plate 522 corresponding working heads are accommodated storehouse 521 is provided with opening 523, be used for passing main shaft 51, the end face of storing folder 52 in the face of working head at opening 523 is provided with U-shaped groove 526, be used for accommodating U-shaped spring 56, U-shaped spring 56 has part and opening 523 when free state be overlapping, and the design of U-shaped groove 526 is reserved with the space to the strain of U-shaped spring 56.Because it is 6 that the preferred working head of the present invention is accommodated the quantity in storehouse 521, corresponding opening 523 quantity also are 6, the quantity of U-shaped groove 526 and U-shaped spring 56 is similarly 6, certainly those skilled in the art are easy to expect, opening 523, U-shaped groove 526 and U-shaped spring 56 also can only arrange one, be that pressing plate 522 is fixedly installed with respect to gear-box 22, what main shaft 51 passed at every turn like this is same opening 523, can not affect rotary work head storage folder 52 to select working head.When main shaft 51 retreated and move backward with working head under the effect of magnet 511, U-shaped spring 56 can strains be stuck on the main shaft 51, and namely U-shaped spring 56 is in the primary importance (with reference to Figure 13) that allows main shaft 51 motions.Because being connected the end of main shaft 51 with working head, the end that main shaft 51 connects working head all has chamfering or rounding, when the opening 523 of pressing plate 522 is left in the end that main shaft 51 connects working head 9, U-shaped spring 56 is replied free state, the part of opening 522 is blocked, when continuing to retreat along with main shaft 51, working head 9 stopped by U-shaped spring 56 that namely U-shaped spring 56 is in the second place (with reference to Figure 14) that restraint of labour head 9 retreats.Main shaft 51 separates with working head 9 like this, another working head 9 that arbitrarily rotary work head storage folder 52 needs with selection.In powered screwdriver work, in order to prevent that U-shaped spring 56 rotations to main shaft 51 from causing resistance, can be on main shaft 51 axially the position of corresponding U-shaped spring 56 annular groove 512 around 51 1 weeks of main shaft is set, U-shaped like this spring 56 can not cause interference to the rotation of main shaft 51.

With reference to Figure 15 to shown in Figure 17, the second embodiment that retreats with main shaft 51 for restriction working head 9.Be fixed with a shell fragment 57 on the toothed wheel box cover plate 223, shell fragment 57 is arranged between working head storage folder 52 and the toothed wheel box cover plate 223, shell fragment 57 is provided with at least one elasticated end 571, elasticated end 571 parts stretch in the hole on the toothed wheel box cover plate 223, pass through like this strain of elasticated end 571, also can realize blocking working head 9, prevent from driving when main shaft 51 from retreating working head 9 and leave working head storage folder 52.With reference to Figure 16, elasticated end 571 is in the primary importance that allows main shaft 51 motions; With reference to Figure 17, elasticated end 571 is in the second place that restraint of labour head 9 retreats.According to present embodiment, those skilled in the art are easy to expect, can directly elasticated end 571 be stuck on the toothed wheel box cover plate 223, the stator of rigidity perhaps is set, and stator can be by elastic reaction in the hole on the partial occlusion toothed wheel box cover plate 223 with leave between two positions, hole on the toothed wheel box cover plate 223 and move.

Generally speaking, output shaft 4 arranges interior hexagonal hole vertically, in order to drive six sides' working head 9 rotations.If but when working head 9 enters output shaft 4 under the drive of main shaft 51, if six side's external forms of working head 9 and output shaft 4 interior hexagonal hole angles stagger, can bring very large inconvenience to the operator.In order to prevent the generation of this situation, the present invention improves the structure of output shaft 4, arrive shown in Figure 19 with reference to Figure 18, the first embodiment for output shaft 4, output shaft 4 arranges through hole 41 vertically, be provided with in the through hole 41 for the moment of torsion with output shaft 4 and pass to the torque transfer part of working head 9 and drive working head and correction unit that torque transfer part matches, torque transfer part is at least one radial protrusion 42 that is arranged in the through hole 41, radial protrusion 42 can with one of them face of six sides' working head 9 against and restraint of labour head 9 with respect to output shaft 4 rotations.Correction unit is to be arranged at the inclined-plane 421 that closes on transmission mechanism 3 one ends in the through hole 41, when contacting with inclined-plane 421, working head 9 can under the guiding on inclined-plane 421, drive output shaft 4 or working head 9 rotations so that through hole 41 matches with working head 9, that is to say, inclined-plane 421 has played the position of correction work 9 a relative radial protrusion 42 when working head 9 enters through hole 41, be working head 9 and output shaft 4 relative rotations, thereby the corner angle that prevent working head 9 are blocked by radial protrusion 42, so that working head 9 can enter in the through hole 41 smoothly.The preferred inclined-plane 421 of the present invention tilts along circumferencial direction, and working head 9 and output shaft 4 counterrotating channeling directions are clearer and more definite like this.In the present embodiment, radial protrusion 42 arranges 12, evenly distribute along circumferencial direction, thereby the normal section of output shaft 4 forms the dodecagon that each projection is 150 degree, the dodecagon here is to be formed by stacking by two hexagon circumferencial direction intervals, 30 degree.When main shaft 51 pushes the work forward 9 when entering output shaft 4, if six sides of working head 9 and the Shi Erjiao of output shaft stagger, six angles of working head 9 can be against on the inclined-plane 421 like that, working head 9 moves axially, under the guiding that along the circumferential direction tilts on inclined-plane 421, working head 9 or output shaft 4 rotate until the through hole 41 of the angle of working head 9 and output shaft 4 matches, thereby working head 9 enters output shaft 4 smoothly.In addition, radial protrusion 42 and inclined-plane 421 can link together, and radial protrusion 42 extends axially along output shaft 4, and the contact area with working head 9 is larger like this, the better effects if of transmitting torque.Certainly, radial protrusion 42 and inclined-plane 421 also can divide and be arranged, and axially disconnect or mode that circumferencial direction staggers etc.

Arrive shown in Figure 21 with reference to Figure 20, the second embodiment for output shaft 4,42 of radial protrusions in the through hole 41 arrange one, be dodecagonal one of them angle, one end of same radial protrusion 42 arranges inclined-plane 421, and inclined-plane 421 tilts along circumferencial direction, and is same, output shaft 4 just can drive working head 9 rotation by a radial protrusion 42, thereby and the guiding by an inclined-plane 421 can realize that also the rotation of working head 9 or output shaft 4 makes working head 9 enter smoothly output shaft 4.But, working head is accommodated always gapped existence between storehouse 521 and the working head 9, and before main shaft 51 drive working heads 9 enter output shaft 4 at every turn, can there be deviation in the axis of the axis of working head 9 and main shaft 51, working head 9 can radially the space of motion be just very little in output shaft 4 like this, in order when working head 9 enters output shaft 4, to make working head 9 have larger space with respect to output shaft 4, can be at the through hole 41 interior guide parts that further arrange, guide part is the interior step 43 that is arranged on an end that closes on working head storage folder 52 in the through hole 41, the internal diameter of interior step 43 is greater than the internal diameter of through hole 41, pass through chamfered transition between interior step 43 and the through hole 41, interior step 43 height vertically is substantially equal to inclined-plane 421 height vertically, like this when working head 9 has just entered output shaft 4, working head 9 has the space of larger rotation or axially-movable with respect to output shaft 4, thereby it is more smooth to enter output shaft 4.

With reference to Figure 22 and shown in Figure 23, the third embodiment for output shaft 4, just be that working head 9 peripheral six sides' point is over against the tip of radial protrusion 42 when preventing that working head 9 from entering output shaft 4, can in output shaft 4 through holes 41, the deep gouge 45 that communicates with interior step 43 be set the position relative at the center with radial protrusion 42, the center relatively here refer to and the tip of radial protrusion 42 centrosymmetric between two sides 413 of deep gouge 45, deep gouge 45 has bottom surface 411 and two sides 412 that link to each other with through hole 41, angled transition between bottom surface 411 and the through hole 41, easily working head 9 is directed in the through hole 41, two sides 412 tilt along circumferencial direction, the point that enters output shaft 4 and working head 9 peripheral six sides when working head 9 like this is during over against the tip of radial protrusion 42, working head 9 radial motions are to deep gouge 45, and in the side 412 lead and be rotated down, under the guiding of bottom surface 411, enter through hole 41 simultaneously.So just can guarantee that working head 9 is in any angle and can enters smoothly output shaft 4.

Above-described is the radial protrusion 42 of output shaft 4 and the mode of moving working head 9 rotations of 6 contact zones of working head, and working head 9 is stressed even like this, and unit are is stressed little.Certainly, the radial protrusion 42 of output shaft 4 contacts with working head 9 lines also can drive working head 9 rotations, as: the angle that does not limit radial protrusion 42, as long as it can drive working head 9 rotations, the inclined-plane 421 of one end along the circumferential direction tilts, and can realize that so also working head 9 enters output shaft 4 smoothly.

Below will elaborate to the quick-replaceable process of working head of the present invention.

With reference to shown in Figure 1, electric screw driver is in running order, and this moment, depression of push button switch 7 can be twisted the work of screw.When needs are changed the working head 9 of another type, operation slip lid 53 moves to the direction of motor 2, cooperation is with reference to Fig. 5, Fig. 8 and shown in Figure 13, inclined-plane 533 on the slip lid 53 contacts with a side 813 on the limited block 81, and along with the movement of slip lid 53, limited block 81 pivot under the effect on inclined-plane 533 rotates to position shown in Figure 9, this moment, limited block 81 was removed the locking to fixed block 50 axially-movables, and slip lid 53 also moves to the position that the first projection 535 contacts with fixed block 50 simultaneously; Next continue to move slip lid 53 to the direction of motor 2, it is mobile in the same way with it that slip lid 53 drives main shaft 51 by fixed block 50, annular groove 512 on the main shaft 51 is crossed U-shaped spring 56, six quadrate parts on the main shaft 51 divide and contact with U-shaped spring 56 and force U-shaped spring 56 strains along with moving behind the main shaft 51, until moving to U-shaped spring 56, main shaft 51 breaks away from, U-shaped spring 56 returns back to free state (as shown in figure 14), slip lid 53 continues to drive main shaft 51 and moves to extreme position, thereby working head 9 then can't be crossed U-shaped spring 56 and stay in the working head storage folder 52, at this moment, the open section of accommodating storehouse 521 by being arranged on working head on the working head storage folder 52 finds needs the working head 9 changed, rotary work head storage folder 52, needed working head 9 forwarded to and the axial relative positions of output shaft 4, i.e. as shown in Figure 2 position.

Next, continuation is with reference to Fig. 2, moving slip lid 53 to the direction of output shaft 4 resets, slip lid 53 is against on the fixed block 50 by the second projection 536 and drives main shaft 51 and move to the direction of output shaft 4, the end that main shaft 51 is provided with magnet 511 contacts with working head 9 afterbodys of having selected and adsorbs this working head 9, slip lid 53 drive main shafts 51 move to the direction of output shaft 4, cooperation is with reference to Figure 20, when working head 9 enters output shaft 4, under the guiding on inclined-plane 421, working head 9 enters output shaft 4 smoothly, and main shaft 51 continues mobile along with slip lid 53, until working head 9 exposes from the front end of output shaft 4, slip lid 53 is returned to the position with fore shell 13 butts, and at this moment, the inclined-plane 533 on the slip lid 53 breaks away from limited block 81, limited block 81 is got back to again the position that axially offsets with fixed block 50 under elastic reaction, electric screw driver has been got back to again duty shown in Figure 1 like this.The process operation that whole working head is changed is simple, fast, for the user, can increase work efficiency greatly.

Above-mentioned definition to each element is not limited in various concrete structures or the shape of mentioning in the embodiment, and those of ordinary skill in the art can replace simply to it with knowing.Can come instead of electr ic motor with gasoline engine or diesel engine etc. such as motor; Working head can be that the cross section is regular arbitrarily polygon; In addition, in the above-mentioned embodiment, moving to axial between main shaft and the working head storage folder also can be that main shaft is fixed, and working head storage folder can either also can rotate in axially-movable, and main shaft also can be and coaxial setting of motor shaft etc.In addition, position-limit mechanism is mainly used in limiting the main shaft axially-movable, and to its structure and have no special requirements, the interior of visual different casings comes corresponding change configuration, can increase new element, also can reduce unnecessary element.

Claims

1. power tool comprises:

Casing;

Motor is arranged in the casing, and outputting rotary power;

Output shaft has the accepting hole that holds working head of axial setting;

Transmission mechanism is arranged between motor and the output shaft and also the rotary power of motor output can be passed to output shaft;

The storage folder is arranged in the casing, and described storage folder comprises be used to the storehouse of accommodating of accommodating several working heads that are set up in parallel;

Main shaft, described main shaft can pass accommodate one of storehouse and several working heads connect and make one of several working heads in accepting hole the operating position and the off-position that separates with one of described several working heads between axially-movable;

It is characterized in that: described power tool also comprises the operating parts that is movably connected on the casing, described operating parts can move between the two positions, in primary importance, described main shaft is in the operating position, described operating parts and casing butt also cover the part that described storage is pressed from both sides, in the second place, described main shaft is in the off-position, and described operating parts and casing gap arrange and expose the part of described storage folder.

2. power tool as claimed in claim 1, it is characterized in that: described operating parts and casing the two one of upper be axially arranged with gathering sill along main shaft, the two another one of described operating parts and casing is provided with the guide rail that matches with gathering sill, described operating parts slide in gathering sill by described guide rail and with respect to casing along the main shaft axially-movable.

3. power tool as claimed in claim 2, it is characterized in that: described operating parts drives described main shaft axially-movable.

4. power tool as claimed in claim 1, it is characterized in that: described casing axially can be divided into the motor part that is provided with motor along main shaft, be provided with the driving section of transmission mechanism, be provided with the storage part of storage folder, when described main shaft was in the operating position, described operating parts was axially overlapping with described driving section and storage part; When described main shaft was in the off-position, described operating parts was axially overlapping with described motor part, overlaps with described driving section.

5. power tool as claimed in claim 1 is characterized in that: but an end of described main shaft and being connected of described transmission mechanism transmitting torque, and the other end of described main shaft can be connected with described output shaft and drive the working head rotation by output shaft.

6. power tool as claimed in claim 5, it is characterized in that: be provided with gear-box in the described casing, described transmission mechanism is housed in the described gear-box, is provided with toothed wheel box cover plate between described gear-box and the storage folder.

7. power tool as claimed in claim 6 is characterized in that: rotatable being supported between casing and the toothed wheel box cover plate of described storage folder.

8. power tool as claimed in claim 6, it is characterized in that: described transmission mechanism comprises the planetary gear reducing mechanism that links to each other with motor and the pinion gear mechanism that links to each other with described main shaft, is provided with the dividing plate between described planetary gear reducing mechanism and described pinion gear mechanism in the described gear-box.

9. power tool as claimed in claim 8 is characterized in that: described pinion gear mechanism comprises the first gear that is connected with described planetary gear reducing mechanism, the 3rd gear that is connected with described main shaft and simultaneously and the second gear of the first gear and the engagement of the 3rd gear.

10. power tool as claimed in claim 1, it is characterized in that: described casing top is provided with opened portion, and the part of described storage folder is exposed from described opened portion.