CN102909678B

CN102909678B - Power tool

Info

Publication number: CN102909678B
Application number: CN201210259921.0A
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: 2015-04-22
Anticipated expiration: 2032-07-20
Also published as: CN202702201U; CN104385205A; CN102909702B; CN102909710B; CN102909701A; CN104476472A; CN202702198U; CN202702199U; CN102909678A; CN102909703A; CN102909679B; CN104385206B; CN104385205B; CN102909701B; CN104385206A; CN102909710A; CN102909702A; CN104801744A; CN104476472B; CN102909703B

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 a stopping part arranged at one end of the holder; the stopping part can move between the two positions; in a first position, the spindle is in the working position, and the stopping part allows the spindle to move axially; and in a second position, the spindle is in the release position, and the stopping part prevents the working heads from leaving the housing bins.

Description

Power tool

Technical field

The present invention relates to a kind of power tool, particularly relate to and a kind ofly realize the storage of working head and quick-replaceable drill gun class power tool.

Background technology

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

Electric screw driver be for by screw-driving to a kind of conventional electric tool on workpiece.In time needing the screw tightening different size in use procedure, change different working heads according to the difference of screw specification, namely screwdriver bit, namely the original working head installed will be taken off, then load onto the working head of another kind of structure.Under the use occasion needing frequent replacing working head, bring great inconvenience to operator, cause replacing working head on the one hand loaded down with trivial details, easy loss placed everywhere by the working head taken off on the other hand.Although, in some hand-operated tools, have some storage that can realize working head and quick-replaceables, due to the inherent defect of hand-operated tools, namely moment of torsion is little, and operation is hard, makes operator be easy to fatigue, cause inefficiency, be not suitable for using as the instrument of specialty in industrial sector.

Chinese utility model patent CN201086280Y discloses a kind of Multi-tool head electric tool, comprise power tool body and multi-knife-head rotaring wheel structure, multi-knife-head rotaring wheel structure comprises the multi-knife-head runner cylinder that can be accommodated multiple cutter head, multi-knife-head runner cylinder can be connected with tool body in axial sliding, when multi-knife-head runner cylinder slides into the position away from tool body, by rotating multi-knife-head runner cylinder thus the cutter head of selection needs.But when multi-knife-head runner cylinder is away from tool body, its main shaft is exposed, the inside of electric tool inside or multi-knife-head runner cylinder is entered in the process that dust, powder can slide at multi-knife-head runner cylinder, time has been grown and multi-knife-head runner cylinder can have been caused to rotate carry out cutter head selection, or directly causes electric tool to use.And working head is against on workpiece when work, such main shaft needs to bear reciprocal active force, and main shaft can bring pressure to transmission mechanism thus transmission mechanism can not be delivered to main shaft moment of torsion.

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

And, when changing cutter head, need first cutter head to be retracted into runner cylinder, when moving axially to prevent runner cylinder, cutter head is held by magnet and leaves from runner cylinder, Chinese utility model patent CN201086280Y is disclosed it and is thrown off to prevent cutter head and runner cylinder by the mode arranging retainer ring on cutter head, but such cutter head needs customized especially, makes the use of instrument 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 larger, to the user of instrument with serving potential danger.Moreover, because runner cylinder needs to move axially to separate with main shaft, be easy to enter dust and other impurities and cannot 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 reliable operation.

The technical solution adopted for the present invention to solve the technical problems is: a kind of power tool, comprising: motor, is arranged in casing, and outputting rotary power; Output shaft, has the accepting hole of the accommodation working head axially arranged; Transmission mechanism, is arranged between motor and output shaft and also the rotary power that motor exports can be passed to output shaft; Store folder, be arranged in casing, the described collecting storehouse storing folder and comprise for accommodating the working head that several are set up in parallel; Main shaft, described main shaft can connect through collecting one of storehouse and several working heads and axially-movable the operating position making one of several working heads in accepting hole and the off-position separated with one of several working heads described; Described power tool also comprises the block piece being arranged on and storing folder one end, described block piece can move between two positions, in primary importance, described main shaft is in operating position, described block piece allows main shaft axially-movable, in the second place, described main shaft is in off-position, and described block piece stops working head to leave collecting storehouse.

Preferably, be provided with pressing plate between described storage folder and transmission mechanism, on described pressing plate, the position in one of them collecting storehouse corresponding is provided with the hole passed for described main shaft, and described block piece to be arranged on pressing plate and overlapping with described bore portion.

Preferably, described pressing plate is connected to and stores on folder, and described hole is equal with the quantity in described collecting storehouse with the quantity of described block piece.

Preferably, described block piece is the U-shaped spring be axially fixed on described pressing plate, and described U-shaped spring can along the elastomeric radial in described hole.

Preferably, described block piece is shell fragment, and one end of described shell fragment is axially fixed on described pressing plate, and the described shell fragment other end is overlapping with described bore portion.

Preferably, described main shaft is provided with annular groove, and when described main shaft is in operating position, the position axis of described annular groove and described block piece is to corresponding.

Preferably, described casing is slidably connected with operating parts, a part for described storage folder is housed in described casing, and another part is covered by described operating parts and moves along with operating parts and expose.

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

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

Preferably, one end of described main shaft and described transmission mechanism can the connections of transmitting torque, and the other end of described main shaft can be connected with described output shaft and drive working head to rotate by output shaft.

Preferably, described storage folder is rotatable to be supported in casing and between transmission mechanism and output shaft.

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

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

Preferably, described transmission mechanism comprises and the planetary gear reducing mechanism of motors and the pinion gear mechanism that is connected with described main shaft, is provided with the dividing plate between described planetary gear reducing mechanism and described pinion gear mechanism in described gear-box.

Preferably, described pinion gear mechanism comprise the first gear be connected with described planetary gear reducing mechanism, the 3rd gear be connected with described main shaft and simultaneously with the second gear of the first gear and the 3rd gears meshing.

Compared with prior art, the invention has the beneficial effects as follows: power tool of the present invention effectively can prevent working head from leaving and store folder in the process changing working head, ensure that higher reliability.

Accompanying drawing explanation

Fig. 1 be the power tool in the preferred embodiment for the present invention in running order time sectional view.

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

Fig. 3 is the part isometric exploded view of Fig. 1 medium power instrument.

Fig. 4 is the stereogram of Fig. 1 medium power tool transmission 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 now position-limit mechanism is in the lock state.

Fig. 7 and Fig. 6 is similar, 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 now position-limit mechanism is in the lock state.

Fig. 9 and Fig. 8 is similar, 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 now position-limit mechanism is in the lock state.

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

Figure 12 is the schematic diagram of the first embodiment that Fig. 2 medium power tool changing working head limit working head retreats.

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

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

Figure 15 is the schematic diagram of the second embodiment that Fig. 2 medium power tool changing working head limit working head retreats.

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

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

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. motor 3. transmission mechanism

4. output shaft 5. Working head quick-changing mechanism 6. battery

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

11. handle 13. fore shell 15. gathering sills

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

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

Step 45. deep gouge in 42. radial protrusions 43.

50. fixed block 51. main shafts 52. store folder

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

57. shell fragments 81,81a, 81b. limited block 82,82a. bearing pin

83. torsion spring 83b. spring 131. perforates

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

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

411. side 413., bottom surface 412. sides

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

521. working head collecting storehouse 522. pressing plate 523. openings

526.U type groove 532. separates lock dog 533. inclined-plane

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

571. elasticated end 813. sides

Detailed description of the invention

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

Shown in Fig. 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 symmetrical two and half housings assembled by screw (not shown), its have horizontal component and with horizontal component angularly handle 11 part that arranges of K, the preferred angle K of the present invention, can be pleasant when such gripping handle 11 operates between 100 degree to 130 degree.Be provided with press button 7 on the top of handle 11 part, battery 6 is fixed on the bottom of casing 2 handle 11 part, and transmission mechanism 3 partial fixing is housed in the horizontal component of casing 1.As preferred embodiment, this battery 6 can be lithium ion battery.It should be noted that, here the general name of said lithium ion battery to be negative material the be rechargeable battery of elemental lithium, according to the difference of positive electrode, it can form many systems, as " lithium manganese " battery, and " lithium iron " battery etc.In the present embodiment, lithium ion battery is that a joint 3.6V(lies prostrate) 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 comprises by (be rear with the right side of drawing) before backward the planetary gear reducing mechanism 31 and pinion gear mechanism 30 that are driven by motor 2, wherein pinion gear mechanism 30 is connected with Working head quick-changing mechanism 5, and by Working head quick-changing mechanism 5, the rotary motion of motor 2 is passed to output shaft 4.Wherein Working head quick-changing mechanism 5 comprises the storage folder for storing different working heads, here working head mainly refers to that crosspoint tip screwdriver head that electric screw driver is conventional, flat blade screwdriver are first-class, can quick-replaceable is different when electric screw driver is tightened or unclamped different screws working head by arranging Working head quick-changing mechanism 5.

According to the composition of above electric screw driver, electric screw driver can be divided into by (be rear with the right side of drawing) before backward the motor part D arranging motor successively, arranges the driving section C of transmission mechanism 3, arranges the storage part B storing folder and the efferent A arranging output shaft.

Motor in the preferred embodiment for the present invention is motor 2, and motor 2 has the motor shaft 21 extended forward from electric machine casing.Motor 2 is fixed in casing 1, and a gear-box 22 to be fixed in casing 1 and to be positioned at the front portion of motor 2, and gear-box 22 is 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 extension is engaged with planetary gear reducing mechanism 31, and rotary motion is passed to pinion gear mechanism 30 by planetary gear reducing mechanism 31.When such motor 2 runs, by planetary gear reducing mechanism 31, pinion gear mechanism 30, finally exported by output shaft 4.In the present embodiment, reducing gear is made up of three grades of deceleration systems and obtains wanted output speed, in other embodiments, depending on the required rotating speed exported, reducing gear can only include one-level or double reduction system, also can comprise more multi-stage speed-reducing system.

Pinion gear mechanism 30 to be also housed in gear-box 22, by the two being separated arranging dividing plate 33 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 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.Pinion gear mechanism 30 comprises can the first gear 301 of being connected of transmitting torque with planetary gear reducing mechanism 31, the 3rd gear 303 be connected with Working head quick-changing mechanism 5 and the second gear 302 engaged with the first gear 301 and the 3rd gear 303, the rotation of the first gear 301 is passed to the 3rd gear 303 by the second gear 302, and the two ends of each gear are supported by axle sleeve.The middle part of dividing plate 221 is provided with the hole supplying the axle of the first gear 301 to pass, the end face of dividing plate 221 is provided with the groove for installing axle sleeve, the rear axle housing supporting pinion gear mechanism 30 is fixed on dividing plate 221, front shaft sleeve is fixed on toothed wheel box cover plate 223, toothed wheel box cover plate 223 and gear-box 22 are fixedly linked by screw, buckle etc., so, namely pinion gear mechanism 30 and planetary gear reducing mechanism 31 can be separated, both can be closed again simultaneously, prevent dust, powder etc. from entering transmission mechanism 3 inner, also can prevent the leakage of lubricating oil.In addition, three gears are set just in order to make the inner space of instrument compacter, thus do not affect the attractive in appearance of outside.Certainly, also can be arranged to two gears as required, one is connected with planetary gear reducing mechanism 31, and another is connected 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 only include planetary gear reducing mechanism 31, or only includes pinion gear mechanism 30, or other rotary motion transmission mechanism, as ratchet mechanism, turbine mechanism etc.

Working head quick-changing mechanism 5, be connected between output shaft 4 and pinion gear mechanism 30, comprise with the 3rd gear 303 can the transmitting torque main shaft 51, the working head that are connected store folder 52 and operation axis 51 move axially with through or leave the slip lid 53 that working head stores folder 52.Main shaft 51 can be connected with output shaft 4 and drive output shaft 4 to rotate, and casing 1 is connected with fore shell 13, and the part that working head stores folder 52 is housed in fore shell 13, and another part is covered along with moving of slip lid 53 by slip lid 53 and exposes.The present invention preferably stores folder 52 for cylindric, conveniently rotates, and takes up room little simultaneously, can certainly be arranged to square or leg-of-mutton etc.When electric screw driver work, slip lid 53 abuts with fore shell 13, working head can be stored folder 52 like this and all be closed with main shaft 51.On toothed wheel box cover plate 223, the position of corresponding main shaft 51 is provided with the hole passed for main shaft 51, gear-box 22 there is arched member 225 around main shaft 51 Axis Extension, arched member 225 can be wholely set with gear-box 22, also can be provided separately, can by partially enclosed for main shaft 51 by arranging arched member 225, when electric screw driver carries out change working head 9, namely the position that slip lid 53 moves to rearmost end also out exposed for main shaft 51, can not can prevent the inside of the entering tool such as dust, powder like this.And toothed wheel box cover plate 223 extends to the end face of arched member 225, thus vertically by transmission mechanism 3 integrally closed together.In the course of the work, working head can be stored folder 52 and be closed by slip lid 53, thus prevent dust from entering, when working head changed by needs, remove slip lid 53 and can expose working head storage folder 52, the working head that convenient selection is different, slip lid 53 is so just needed to have certain length, when slip lid 53 moves to the operating position abutted with fore shell 13, 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 with driving section C part axial overlap.Certainly, the mode of slip lid 53 movement also has a lot, and such as slip lid 53 is rotatable to be installed on casing 1, rotates between two positions that covering stores folder 52 and exposes storage folder 52; Or be similar to the mode of sliding door, can open or close; Or pivotable be connected to mode of the window of casing 1 etc., when can realize work, storage folder 52 is closed, need change working head time storage folder 52 is exposed.

Output shaft 4 is form of sleeve, can installment work 9 in it, and working head 9 can be driven to rotate, the present invention inserts output shaft 4 by main shaft 51 and drives output shaft 4 to rotate, and then by the mode that output shaft 4 drives working head 9 to rotate, rotary motion is passed to working head 9, the working head 9 of standard can be used like this, and without the need to offering the hole of collecting working head 9 on main shaft 51, avoid the weight and volume of the excessive increase complete machine of main shaft 51 diameter.Output shaft 4 is supported in the axial aperture 131 of fore shell 13 by a sleeve 40, and sleeve 40 is fixed in the perforate 131 of fore shell 13, provides radial support and axial location to output shaft 4.Like this, what directly drive working head 9 to rotate is output shaft, shorten the distance of torque transfer, thus the use of instrument is more reliable.Above-described is that main shaft moves the mode of working head rotation by output shaft indirect belt, but, those skilled in the art are easy to expect that other transmission means substitutes, and such as main shaft directly drives working head to rotate, namely main shaft directly with working head can the mode of transmitting torque be connected.

Fig. 1 to Fig. 3 coordinates with reference to shown in Fig. 5, and main shaft 51 is six square shafts, on 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 fixed block 50, and slip lid 53 drives main shaft 51 to move by the mode be connected 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-apart, in the duty of electric screw driver, first projection 535 has distance S with fixed block 50 axially spaced-apart, when slip lid 53 slides backward, namely slide in the direction towards motor 2, slided after distance S, the first projection 535 axially abuts with fixed block 50, thus slip lid 53 drives fixed block 50 then to drive main shaft 51 axially to move backward; In the state of the replaceable working head of electric screw driver, second projection 536 has distance S with fixed block 50 axially spaced-apart, when slip lid 53 forward slip, namely slide in the direction towards output shaft 4, slide after distance S, second projection 536 axially abuts with fixed block 50, thus slip lid 53 drives fixed block 50 then to drive main shaft 51 axially to move forward.Certainly, it is a lot of that slip lid 53 drives the mode of main shaft 51 movement to also have, as the annular groove around its outer week Monday can be arranged on main shaft 51, slip lid 53 is extend in annular groove by a pin or steel wire ring and is connected 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 arranged in gathering sill 15 can be slid axially relative to casing 1 by its guide rail 531.Certainly, also can be that slip lid 53 arranges gathering sill, mode casing 1 being arranged guide rail makes slip lid move.In addition, the both sides of slip lid 53 outside are provided with recessed or convex tread plate 537, block when slip lid 53 moves can prevent from skidding at operator's finger.

Working head stores that folder 52 is rotatable is supported between toothed wheel box cover plate 223 and fore shell 13, working head stores on folder 52 and is evenly distributed with multiple working head collecting storehouse 521 along its circumferencial direction, working head collecting storehouse 521 stores folder 52 along working head, and axially a part is closed, part excircle opens wide, such handled easily person selects the shape that can be easy to see from the part of opening wide working head 9 head during working head 9, thus selects the working head 9 of needs fast.Certainly, those skilled in the art are easy to expect, working head collecting storehouse 521 also can be totally enclosed, only need identify in the position of correspondence, or directly working head are stored folder 52 and make transparent, can conveniently identify.In addition, can store between folder 52 and toothed wheel box cover plate 223 at working head and carry out elasticity location, namely store folder 52 at working head, on the end face of toothed wheel box cover plate 223, groove is set in the position of corresponding working head 9, toothed wheel box cover plate 223 is arranged the steel cap compressed by spring, or shell fragment, so, working head stores folder 52 and often turns over a working head 9 and all can send the voice prompt that steel cap or shell fragment fall into groove, thus convenient operator selects working head 9, and because these positions pre-set, the angle that working head storage folder 52 can be avoided to rotate and main shaft 51 stagger.Foregoing is by the different working head of the way selection of storage folder rotation, can certainly by storing the mode that intermediate straight line moves, and such as working head is arranged side by side along storing the radial direction of pressing from both sides, and selecting just needs during working head radially to promote to store to press from both sides.Storing folder in the preferred embodiment of the present invention is in addition axial restraint, move working head by main shaft Axially moving belt enter output shaft and carry out work, main shaft axial restraint can certainly be arranged to, move axially by storing folder the mode rotating or move radially to select working head again, thus also can realize taking off the quick-replaceable that working head just can realize working head.

The front end of main shaft 51 is provided with magnet 511, for adsorbing working head 9, when selecting good berth head 9, can operate slip lid 53 drives main shaft 51 through the working head collecting storehouse 521 of this working head 9 of collecting, working head 9 is adsorbed by the magnet 511 on main shaft 51, and under the promotion of main shaft 51, leave working head collecting storehouse 521, enter output shaft 4.When work, main shaft 51 drives output shaft 4 to rotate, and output shaft 4 drives working head 9 to rotate.

Electric screw driver needs working head 9 to be axially pressed on screw or workpiece when operating, such work 9 can be subject to a reverse responsive to axial force, move after producing main shaft 51, the present invention proposes three kinds of solutions for addressing this problem, and is described respectively below.

With reference to shown in Fig. 4 to Fig. 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 preventing main shaft 51 from retreating, and position-limit mechanism 8 comprises pivotable limited block 81, along the torsion spring 83 of limited block 81 pivotal orientation bias voltage limited block 81.Wherein one end of limited block 81 props up fixed block 50, and the other end is arranged on gear-box 22 or on casing 1 by a bearing pin 82, and the axis being parallel of bearing pin 82 is in the axis of main shaft 51, and limited block 81 can rotate within the scope of certain angle around bearing pin 82.One end of torsion spring 83 is fixed on limited block 81, and the other end is against on gear-box 22 or on casing 1, the primary importance (shown in Fig. 4 and Fig. 6) that the elastic force of torsion spring 83 makes limited block 81 remain on to offset with fixed block 50.Such position-limit mechanism 8 preferably arranges two, and the axisymmetrical along main shaft 51 distributes, and can keep stress balance like this, makes the axial limiting of main shaft 51 more reliable.When the mobile main shaft 51 of needs, the restriction to main shaft 51 movement namely can be removed by slip slip lid 53.Slip lid 53 inside is provided with the solution lock dog 532 matched 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 the elastic force effect that limited block 81 overcomes torsion spring 83 under the drive on inclined-plane 533 rotates around bearing pin 82, until limited block 81 and fixed block 50 are thrown off, fixed block 50 is unlocked, thus limited block 81 is in the second place (shown in Fig. 7) allowing main shaft 51 axially-movable.Main shaft 51 continues to move axially, and limited block 81 is stuck in the two ends of fixed block 50, now just can carry out replacing working head.This shows, before slip lid 53 drives main shaft 51 to move, first sliding distance S is the restriction removing the axially-movable of limited block 81 pairs of main shafts 51, as long as therefore the movement that distance S meets slip lid 53 can remove the locking of limited block 81 pairs of main shafts 51 axially-movable.After working head is more finished changing, slip lid 53 moves forward, main shaft 51 and fixed block 50 is driven also to move forward, the inclined-plane 533 separated on 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 axially offseted with fixed block 50 under the effect of torsion spring 83, when such electric screw driver work, output shaft 4 is stretched in main shaft 51 front end, the fixed block 50 being located at main shaft 51 rear end axially props up for limited piece 81, the axially-movable of such main shaft 51 is limited, namely main shaft 51 cannot retreat, thus the use of electric screw driver is more reliable.

With reference to shown in Fig. 8 and Fig. 9, for the second embodiment of position-limit mechanism 8, with above-mentioned position-limit mechanism 8 unlike, the axes normal of bearing pin 82a is in the axis of main shaft 51, one end and the bearing pin 82a of limited block 81a are pivotally connected, and the other end is formed as hook-shaped, hook on fixed block 50, such fixed block 50 also can be limited to move backward, thus limited block 81a is in the primary importance (shown in Fig. 8) of locking main shaft 51 axially-movable.Slip lid 53 moves and its inclined-plane 533 separated on lock dog 532 is contacted with limited block 81a, limited block 81a rotates around bearing pin 82a and removes the locking to fixed block 50 under the guiding on inclined-plane 533, thus limited block 81a is in the second place (shown in Fig. 9) allowing main shaft 51 axially-movable.In present embodiment, the action principle of position-limit mechanism 8a is identical with the first embodiment, repeats no more here.

With reference to shown in Figure 10 and Figure 11, for the third embodiment of position-limit mechanism 8, position-limit mechanism 8b comprises limited block 81b and spring 83b, limited block 81b is relative to casing 1 axial restraint, limited block 81b can along the direction rectilinear motion perpendicular to main shaft 51 axis, one end of spring 83b is housed in limited block 81b, and the other end is connected with casing 1 or gear-box 22, the primary importance (shown in Figure 10) that spring 83b bias voltage limited block 81b makes it remain on axis and fixed block 50 to offset.In the present embodiment, also be interact to remove the locking to fixed block 50 axially-movable with limited block 81b by the inclined-plane 533 be arranged in slip lid 53, the elastic force that limited block 81b overcomes spring 83b is linearly moved to the second place (shown in Figure 11) removed and lock main shaft 51.The direction that the incline direction on inclined-plane 533 here can move according to limited block 81b is selected, if limited block 81b is along the horizontal motion perpendicular to main shaft 51 axis, and the planar tilt that inclined-plane 533 is formed relative to direction and the vertical direction of main shaft 51 axis; Limited block 81b moves along the vertical direction perpendicular to main shaft 51 axis, the planar tilt that inclined-plane 533 is formed relative to direction and the horizontal direction of main-shaft axis; Limited block 81b is along moving with the horizontal direction direction angularly perpendicular to main shaft 51 axis, such limited block 81b has along the component in level and vertical both direction, therefore the incline direction on inclined-plane 533 can have multiple selection, those skilled in the art can expect easily, repeat no more here.

Three kinds of embodiments of above-described position-limit mechanism 8, all move by slip lid 53 locking removing the axially-movable of limited block 81 pairs of main shafts 51, because slip lid 53 also will drive main shaft 51 to move axially, so just need a slip lid 53 first mobile segment distance, namely the locking of limited block 81 pairs of main shafts 51 axially-movable is first removed, main shaft 51 could be driven again to move axially, slip lid 53 inside drives the first projection 535 of main shaft 51 movement to arrange with fixed block 50 axially spaced-apart, the distance of axially spaced-apart is determined by the angle of inclination on inclined-plane 533 and limited block 81 ultimate range radial overlapping with fixed block 50.Certainly, those skilled in the art are also easy to the locking expecting also realizing removing the axially-movable of limited block 81 pairs of main shafts 51 without the need to the mode by slip lid 53 movement, as arranged the knob be connected with limited block 81 outward at casing 1, limited block 81 is driven to overcome spring force rotation or move by rotating knob; Or the toggle or button that are connected with limited block 81 are set outward at casing 1, also limited block 81 can be driven to overcome spring force rotation or move etc. by promoting toggle or pressing button, the locking removing the axially-movable of limited block 81 pairs of main shafts 51 can be realized.

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

When the work of needs electric screw driver, main shaft 51 moves forward under the drive of slip lid 53, the working head promoting to have selected enters output shaft 4, when working head changed by needs, main shaft 51 retreats under the drive of slip lid 53, because one end that main shaft 51 contacts with working head is provided with magnet 511, store in the working head collecting storehouse 521 of folder 52 so main shaft 51 can drive working head to get back to working head.And if main shaft 51 continue after move, can drive working head from working head collecting storehouse 521 in out, cause changing working head, if operator do not find and rotary work head store folder 52 time, probably cause the damage of instrument.The present invention proposes two kinds of solutions for addressing this problem, and is described respectively below.

With reference to shown in Fig. 3 and Figure 12 to Figure 14, it is the first embodiment that restriction working head retreats with main shaft 51.Working head stores folder 52 and is provided with pressing plate 522 in the face of one end of gear-box 22, and pressing plate 522 can rotate together along with working head stores folder 52, and pressing plate 522 can store folder 52 integral type with working head and arrange, also can be provided separately, present embodiment is preferably provided separately, and both convenient processing, also easily assembled.The position in pressing plate 522 corresponding working head collecting storehouse 521 is provided with opening 523, for passing main shaft 51, U-type groove 526 is provided with in the face of working head stores on the end face of folder 52 at opening 523, for accommodating U-shaped spring 56, U-shaped spring 56 has part to be overlapping with opening 523 when free state, the design of U-type groove 526 is reserved with space to the elastic deformation of U-shaped spring 56.Because the quantity in the present invention's preferred working head collecting storehouse 521 is 6, corresponding opening 523 quantity is also 6, the quantity of U-type groove 526 and U-shaped spring 56 is similarly 6, certain those skilled in the art are easy to expect, opening 523, U-type groove 526 and U-shaped spring 56 also can only arrange one, namely pressing plate 522 is fixedly installed relative to gear-box 22, and what such main shaft 51 passed at every turn is same opening 523, can not affect rotary work head and store folder 52 to select working head.When main shaft 51 retreats and moves backward with working head under the effect of magnet 511, U-shaped spring 56 can elastic deformation be stuck on main shaft 51, and namely U-shaped spring 56 is in the primary importance (with reference to Figure 13) allowing main shaft 51 to move.Because the end that main shaft 51 connects working head is connected main shaft 51 end with 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, free state replied by U-shaped spring 56, the part of opening 522 is blocked, working head 9 is stopped by U-shaped spring 56 along with when main shaft 51 continues retrogressing, and namely U-shaped spring 56 is in the second place (with reference to Figure 14) that restriction working head 9 retreats.Such main shaft 51 separates with working head 9, can store folder 52 to select another working head 9 needed by rotary work head arbitrarily.When powered screwdriver work, resistance is caused to the rotation of main shaft 51 in order to prevent U-shaped spring 56, can arrange around the main shaft annular groove of 51 1 weeks 512 position of axial corresponding U-shaped spring 56 on main shaft 51, U-shaped like this spring 56 can not cause interference to the rotation of main shaft 51.

With reference to shown in Figure 15 to Figure 17, it is the second embodiment that restriction working head 9 retreats with main shaft 51.Toothed wheel box cover plate 223 is fixed with a shell fragment 57, shell fragment 57 is arranged on working head and stores between folder 52 and toothed wheel box cover plate 223, shell fragment 57 is provided with at least one elasticated end 571, elasticated end 571 part stretches in the hole on toothed wheel box cover plate 223, like this by the elastic deformation of elasticated end 571, also can realize blocking working head 9, drive working head 9 to leave working head when preventing main shaft 51 from retreating and store folder 52.With reference to Figure 16, elasticated end 571 is in the primary importance allowing main shaft 51 to move; With reference to Figure 17, elasticated end 571 is in the second place that restriction working head 9 retreats.According to the present embodiment, those skilled in the art are easy to expect, can directly elasticated end 571 be stuck on toothed wheel box cover plate 223, or arrange the stator of rigidity, stator is by the hole of elastic reaction on partial occlusion toothed wheel box cover plate 223 and leave on toothed wheel box cover plate 223 between Liang Ge position, hole to move.

Generally, output shaft 4 arranges interior hexagonal hole vertically, to drive the working head 9 of six sides to rotate.If but when working head 9 enters output shaft 4 under the drive of main shaft 51, if hexagonal hole angle staggers in six side's external forms of working head 9 and output shaft 4, very large inconvenience can be brought to operator.In order to prevent the generation of this situation, the structure of the present invention to output shaft 4 is improved, with reference to shown in Figure 18 to Figure 19, for the first embodiment of output shaft 4, output shaft 4 arranges through hole 41 vertically, the correction unit being provided with the torque transfer part for the moment of torsion of output shaft 4 being passed to working head 9 in through hole 41 and driving working head and torque transfer part to match, torque transfer part is at least one radial protrusion 42 be arranged in through hole 41, radial protrusion 42 can with one of them face of the working head 9 of six sides against and limit working head 9 and rotate relative to output shaft 4.Correction unit is be arranged at the inclined-plane 421 closing on transmission mechanism 3 one end in through hole 41, output shaft 4 or working head 9 can be driven under the guiding on inclined-plane 421 to rotate through hole 41 and working head 9 are matched when working head 9 contacts with inclined-plane 421, that is, inclined-plane 421 serves the position of a correction work 9 relative radial protrusion 42 when working head 9 enters through hole 41, namely working head 9 is relative with output shaft 4 rotates, thus working head 9 prevents the corner angle of working head 9 from being blocked by radial protrusion 42, so that can enter in through hole 41 smoothly.The preferred inclined-plane 421 of the present invention circumferentially tilts, and the channeling direction of such working head 9 rotation relative to output shaft 4 definitely.In the present embodiment, radial protrusion 42 arranges 12, circumferentially be uniformly distributed, thus the normal section of output shaft 4 is formed as the dodecagon that each projection is 150 degree, dodecagon is here formed by stacking by 30 degree, two hexagon circumferencial direction intervals.When main shaft 51 push the work forward 9 enter output shaft 4 time, if the Shi Erjiao of six sides of working head 9 and output shaft staggers, six angles of such working head 9 can be against on inclined-plane 421, working head 9 moves axially, under the guiding along the circumferential direction tilted on inclined-plane 421, working head 9 or output shaft 4 rotate until the angle of working head 9 and the through hole 41 of output shaft 4 match, thus working head 9 enters output shaft 4 smoothly.In addition, radial protrusion 42 and inclined-plane 421 can link together, and radial protrusion 42 axially extends along output shaft 4, larger with the contact area of working head 9 like this, the better effects if of transmitting torque.Certainly, radial protrusion 42 and inclined-plane 421 also can be provided separately, mode that axial disconnection or circumferencial direction stagger etc.

With reference to shown in Figure 20 to Figure 21, for the second embodiment of output shaft 4, radial protrusion 42 in through hole 41 only arranges one, for one of them angle dodecagonal, one end of same radial protrusion 42 arranges inclined-plane 421, and inclined-plane 421 circumferentially tilts, same, output shaft 4 just can drive working head 9 to rotate by a radial protrusion 42, and also can realize the rotation of working head 9 or output shaft 4 by the guiding on an inclined-plane 421 thus make working head 9 enter output shaft 4 smoothly.But, always have gap between working head collecting storehouse 521 and working head 9 to exist, and before main shaft 51 drives working head 9 to enter output shaft 4 at every turn, can deviation be there is in the axis of working head 9 and the axis of main shaft 51, such working head 9 can the space of radial motion in output shaft 4 just very little, relative to output shaft 4, there is larger space in order to make working head 9 when working head 9 enters output shaft 4, in through hole 41, guide part can be set further, guide part is be arranged in through hole 41 to close on the interior step 43 that working head stores one end of folder 52, the internal diameter of interior step 43 is greater than the internal diameter of through hole 41, chamfered transition is passed through between interior step 43 and through hole 41, interior step 43 height is vertically substantially equal to inclined-plane 421 height vertically, like this when working head 9 has just entered output shaft 4, working head 9 has larger rotation or the space of axially-movable relative to output shaft 4, thus it is more smooth to enter output shaft 4.

With reference to shown in Figure 22 and Figure 23, for the third embodiment of output shaft 4, just that the point of peripheral six sides of working head 9 is just to the tip of radial protrusion 42 when entering output shaft 4 to prevent working head 9, the deep gouge 45 communicated with interior step 43 can be set in position relative at center with radial protrusion 42 in output shaft 4 through hole 41, center relatively here refer to and the centrosymmetric point in tip of radial protrusion 42 between two sides 413 of deep gouge 45, deep gouge 45 has the bottom surface 411 and two sides 412 that are connected with through hole 41, angled transition between bottom surface 411 and through hole 41, easily working head 9 is directed in through hole 41, two sides 412 circumferentially tilt, like this when working head 9 enters output shaft 4 and the tip of the point of peripheral six sides of working head 9 just to radial protrusion 42 time, working head 9 radial motion is to deep gouge 45, and be rotated down in leading of side 412, under the guiding of bottom surface 411, enter through hole 41 simultaneously.So just can ensure that working head 9 is in any angle and can enters output shaft 4 smoothly.

The above-described radial protrusion 42 for output shaft 4 and working head 6 contact zones move the mode that working head 9 rotates, and such working head 9 uniform force, unit are is stressed little.Certainly, radial protrusion 42 and working head 9 linear contact lay of output shaft 4 also can drive working head 9 to rotate, as: the angle not limiting radial protrusion 42, as long as it can drive working head 9 to rotate, the inclined-plane 421 of its one end along the circumferential direction tilts, and so also can realize working head 9 and enter output shaft 4 smoothly.

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

With reference to shown in Fig. 1, electric screw driver is in running order, and now depression of push button switch 7 can carry out the work of stubborn screw.When needing the working head 9 changing another type, operation slip lid 53 moves to the direction of motor 2, coordinate with reference to Fig. 5, shown in Fig. 8 and Figure 13, inclined-plane 533 on slip lid 53 contacts with the side of on limited block 81 813, and along with the movement of slip lid 53, limited block 81 pivot under the effect on inclined-plane 533 rotates to the position shown in Fig. 9, now limited block 81 relieves the locking to fixed block 50 axially-movable, and slip lid 53 also moves to the position that the first projection 535 contacts with fixed block 50 simultaneously, following continuation moves slip lid 53 to the direction of motor 2, slip lid 53 drives main shaft 51 to move in the same way with it by fixed block 50, annular groove 512 on main shaft 51 crosses U-shaped spring 56, six quadrate parts on main shaft 51 divide and to contact with U-shaped spring 56 and to force the elastic deformation of U-shaped spring 56 along with moving after main shaft 51, depart from until main shaft 51 moves to U-shaped spring 56, U-shaped spring 56 returns back to free state (as shown in figure 14), slip lid 53 continues to drive main shaft 51 to move to extreme position, working head 9 then cannot be crossed U-shaped spring 56 thus stay working head and store in folder 52, now, the working head 9 needing to change is found by the open section being arranged on the working head collecting storehouse 521 that working head stores on folder 52, rotary work head stores folder 52, required working head 9 is forwarded to the position axially relative with output shaft 4, i.e. position as shown in Figure 2.

Next, continue with reference to Fig. 2, direction to output shaft 4 is moved slip lid 53 and is resetted, slip lid 53 is against on fixed block 50 by the second projection 536 and drives main shaft 51 to move to the direction of output shaft 4, one end that main shaft 51 is provided with magnet 511 contacts with working head 9 afterbody selected and adsorbs this working head 9, slip lid 53 drives main shaft 51 to move to the direction of output shaft 4, coordinate 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 is along with slip lid 53 continuation movement, until working head 9 exposes from the front end of output shaft 4, slip lid 53 is returned to the position abutted with fore shell 13, now, inclined-plane 533 on slip lid 53 departs from limited block 81, limited block 81 gets back to again the position axially offseted with fixed block 50 under elastic reaction, the duty shown in Fig. 1 got back to again by such electric screw driver.The process operation that whole working head is changed is simple, fast, for the user, can increase work efficiency greatly.

The above-mentioned definition to each element is not limited in the various concrete structure or shape mentioned in embodiment, and those of ordinary skill in the art can replace it with knowing simply.As motor can carry out alternative motor with gasoline engine or diesel engine etc.; Working head can be cross section is arbitrary regular polygon; In addition, in above-mentioned embodiment, moving to axial between main shaft and working head store and press from both sides 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 coaxially arrange etc. with motor shaft.In addition, position-limit mechanism is mainly used in restriction main shaft axially-movable, and have no special requirements to its structure, the interior of visual different casing carrys out corresponding change configuration, can increase new element, also can reduce unnecessary element.

Claims

1. a power tool, comprising:

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

Output shaft, has the accepting hole of the accommodation working head axially arranged;

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

Store folder, be arranged in casing, the described collecting storehouse storing folder and comprise for accommodating the working head that several are set up in parallel;

Main shaft, described main shaft can connect through collecting one of storehouse and several working heads and axially-movable the operating position making one of several working heads in accepting hole and the off-position separated with one of several working heads described;

It is characterized in that: described power tool also comprises can drive the slip lid of main shaft axially-movable, the limited block that can lock main shaft axially-movable and be arranged on the block piece storing folder one end, and described block piece can move between primary importance and the second place; When described main shaft is in operating position, described block piece is in primary importance, and described block piece allows main shaft axially-movable; Drive main shaft to axially move to off-position when mobile described slip lid removes limited block to the locking of main shaft axially-movable, described block piece is in the second place, described block piece stops working head to leave collecting storehouse.

2. power tool as claimed in claim 1, it is characterized in that: between described storage folder and transmission mechanism, be provided with pressing plate, on described pressing plate, the position in one of them collecting storehouse corresponding is provided with the hole passed for described main shaft, and described block piece to be arranged on pressing plate and overlapping with described bore portion.

3. power tool as claimed in claim 2, is characterized in that: described pressing plate is connected to and stores on folder, and described hole is equal with the quantity in described collecting storehouse with the quantity of described block piece.

4. power tool as claimed in claim 2, is characterized in that: described block piece is the U-shaped spring be axially fixed on described pressing plate, and described U-shaped spring can along the elastomeric radial in described hole.

5. power tool as claimed in claim 2, it is characterized in that: described block piece is shell fragment, one end of described shell fragment is axially fixed on described pressing plate, and the described shell fragment other end is overlapping with described bore portion.

6. power tool as claimed in claim 1, is characterized in that: described main shaft is provided with annular groove, and when described main shaft is in operating position, the position axis of described annular groove and described block piece is to corresponding.

7. power tool as claimed in claim 1, is characterized in that: one end of described main shaft and described transmission mechanism can the connections of transmitting torque, and the other end of described main shaft can be connected with described output shaft and drive working head to rotate by output shaft.

8. power tool as claimed in claim 1, it is characterized in that: be provided with gear-box in described casing, described transmission mechanism is housed in described gear-box, is provided with toothed wheel box cover plate between described gear-box and storage folder.

9. power tool as claimed in claim 8, is characterized in that: described storage folder is rotatable to be supported between casing and described toothed wheel box cover plate.