CN102950566B - Screw support device and screw tool assembled with screw support device - Google Patents

Abstract

The invention relates to a screw support device which is used for helping a screw tool for hammering a screw into a workpiece to position the screw. The screw tool is provided with an axis of an output shaft, the screw support device comprises a shell and a support piece which is positioned outside the shell and used for supporting the screw, wherein a containing space for containing the support piece is formed in the shell, so that the support piece can be contained in the containing space in an operable manner to be incapable of supporting the screw. According to the screw support device and the screw tool, the support piece for supporting the screw can move, so that the screw support device can work selectively.

Description

Screw supporting device and assemble the screw instrument of this screw supporting device

Technical field

The present invention relates to a kind of screw supporting device and assemble the screw instrument of this screw supporting device.

Background technology

In the daily life of the mankind, screw is very common, can be applied to a lot of occasion.Such as in house decoration process, often need the sheet material that two pieces of scripts separate to link together, this just hammers in sheet material with screw.Also have such as hanging articles on wall or on ceiling, also can need to hammer into screw on corresponding wall or on ceiling.We need this kind of sheet material or wall etc. to be referred to as workpiece by the thing that screw hammers into.For process screw being hammered into workpiece, people mainly consider following factor: 1. wish that screw always hammers into workpiece with the normal direction on vertical workpiece surface.2. do not need the strength costed a lot of money when screw is screwed into workpiece, play the effect of saving labourer's muscle power.3. it is short that the time that the whole process being screwed into screw spends tries one's best, and can save the time that labourer spends.

At present screw is screwed into workpiece and has several frequently seen method, a kind of method utilizes hand-operated tools that screw is screwed into workpiece, and hand-operated tools can be flat blade screwdriver, crosspoint tip screwdriver etc.But this method has a lot of shortcoming, hand-operated tools cannot provide extra moment of torsion and labourer oneself can only be relied on to provide moment of torsion, much physical with regard to labor intensive person like this.In addition, the rotary speed of hand-operated tools is very low, and the time that screw is screwed into spent by workpiece extends greatly, reduces the efficiency of labourer.

Also have a kind of method to utilize electric tool that screw is screwed into workpiece, electric tool can be screwdriver, electric drill etc.Electric tool adopts electric power motor to export machine power, thus usually can obtain higher moment of torsion and rotating speed faster.Greatly can save muscle power and the time of labourer.But screw is easy to depart from normal orientation being screwed in process, and labourer must manually just can be screwed into by righting screw.This brings very large inconvenience to labourer.Certain methods is found out to these people and is being screwed into generation inclination in process to avoid screw.Adopt Elastic clamping plate to clamp screw as Chinese patent CN2142385Y discloses, keep its vertical workpiece surface.Such as Chinese patent CN2205766Y discloses the clamp screws device be made up of buckle reed again.But the chucking power of these clamp screws devices to screw is less and result of use is undesirable, screw is easy to from these clamping devices, come off or occur the situation that screw tilts, and makes troubles, cannot really increase work efficiency to the process of being screwed into.In addition, these devices are difficult to be combined with electric tool.

This is necessary to a kind of device of screw of can effectively helping of design can overcome above various shortcoming.

Summary of the invention

In view of this, a kind of can change is the object of the present invention is to provide to help the screw supporting device of the support part position of screw and assemble the screw instrument of this screw supporting device.

The present invention solves the technical scheme that prior art problem adopts: a kind of screw supporting device, for auxiliary screw instrument support screw screw being hammered into workpiece, screw instrument has output shaft axis, screw supporting device comprises housing, be positioned at housing outer for helping the support part of screw, there is in housing the receiving space that part is helped in collecting, help part to be operationally incorporated in receiving space to make support part help screw.

Preferably, help part to have the primary importance be positioned at outside housing and the second place being positioned at receiving space, help part operationally to move vertically and change between the first position and the second position.

Preferably, when primary importance, help part to help screw rotationally, when the second place, help part to help screw.

Preferably, screw supporting device comprises the actuator and the locking of operation actuator that drive and help part movement or the gauge tap unlocked.

Preferably, screw supporting device also comprises the bias piece of bias voltage actuator, and gauge tap operationally unlocks rear bias piece promotion actuator makes support part move to primary importance.

Preferably, gauge tap comprises the stop part of actuator described in backstop, and stop part overcomes the bias voltage axial stop actuator of bias piece in the second place.

Preferably, stop part has the lozenges tilted to axial abutted with actuator, and the actuator position that axially promotion lozenges makes stop part turn to backstop actuator locks.

Preferably, gauge tap also comprises operating parts, and operating parts operationally drives stop part rotation that gauge tap is unlocked.

Preferably, gauge tap also comprises one for the torsion spring of bias voltage stop part.

The technical scheme that the present invention is other adopted is: a kind of screw instrument, for screw is hammered into workpiece, screw instrument comprises shell, is positioned at the motor of shell, connecting motor also has the output shaft of output shaft axis, and screw instrument comprises aforesaid screw supporting device.

Compared with prior art, beneficial effect of the present invention is: help the support part of screw can carry out moving screw supporting device is selectively worked.

Accompanying drawing explanation

Above-described object of the present invention, technical scheme and beneficial effect by the detailed description that can realize specific embodiments of the invention below, can describe and clearly obtain simultaneously by reference to the accompanying drawings.

Identical label in accompanying drawing and description and symbol are for representing identical or equivalent element.

Fig. 1 is the schematic diagram comprising the screw instrument of screw supporting device of first embodiment of the invention.

Fig. 2 be in Fig. 1 screw supporting device along the decomposing schematic representation of output shaft axis.

Fig. 3 is the decomposing schematic representation along a visual angle of screw supporting device in Fig. 1.

Fig. 4 is the decomposing schematic representation along another visual angle of screw supporting device in Fig. 1.

Fig. 5 is the sectional view that in Fig. 1, screw supporting device is in primary importance.

Fig. 6 is the sectional view that in Fig. 1, screw supporting device is in the second place.

Fig. 7 is the working state schematic representation of screw supporting device in Fig. 1.

Fig. 8 is the decomposing schematic representation comprising the screw instrument of screw supporting device of second embodiment of the invention.

Fig. 9 is the decomposing schematic representation of the rotary unit of screw supporting device in Fig. 8.

Figure 10 is the decomposing schematic representation of the driving mechanism of screw supporting device in Fig. 8.

Figure 11 is the sectional view of screw supporting device in Fig. 8.

Figure 12 is the schematic diagram comprising the screw instrument of screw supporting device of third embodiment of the invention.

Figure 13 is the decomposing schematic representation of screw supporting device in Figure 12.

Figure 14 is the sectional view of screw supporting device in Figure 12.

Figure 15 is the working state schematic representation of screw supporting device in Figure 12.

Figure 16 is the decomposing schematic representation comprising the screw instrument of screw supporting device of fourth embodiment of the invention.

Figure 17 be in Figure 16 screw supporting device along the schematic diagram of output shaft axis.

Figure 18 is the sectional view of screw supporting device in Figure 16.

Figure 19 is the schematic diagram comprising the screw instrument of screw supporting device of fifth embodiment of the invention.

Figure 20 is after the screw supporting device rotational angle shown in Figure 19 and the schematic diagram of screw instrument cooperation.

Figure 21 is the schematic diagram of the screw supporting device shown in Figure 19.

Figure 22 is the sectional view that the screw supporting device shown in Figure 19 removes along axis X after partial shell.

Figure 23 is the exploded perspective view along axis X of the screw supporting device shown in Figure 19.

Figure 24 is the exploded perspective view of the axis C along bearing pin of the screw supporting device shown in Figure 19.

Figure 25 is the carrier unit of the screw supporting device shown in Figure 19 and the oblique view of support unit matching.

Figure 26 is the exploded perspective view of rotating ring along axis X of screw supporting device described in Figure 19.

Figure 27 is the sectional view along axis X when not helping screw of the screw supporting device shown in Figure 19.

Along the sectional view of axis X when Figure 28 is the screw supporting device support screw shown in Figure 19.

Figure 29 is the sectional view that the carrier unit of the screw supporting device shown in Figure 19 abuts along axis X when surface of the work is in the second state.

Figure 30 is the carrier unit of the screw supporting device shown in Figure 19 sectional view along axis X when being in the first state.

Along the sectional view of axis X when Figure 31 is the stopper section abutting stop part of the support unit of the screw supporting device shown in Figure 19.

Figure 32 is the sectional view that the support unit of the screw supporting device shown in Figure 19 unclamps along axis X when helping screw.

1, screw instrument 2, screw supporting device 3, shell

4, handle 5, starting switch 6, housing

7, abutting agency 8, support part 9, actuator

10, output shaft 11, output magazine 12, elastic component

13, ball 14, gauge tap 15, drive tab

16, dead eye 17, shape for hat component 18, spring

19, reset switch 20, depthkeeping unit 21, first end

22, the second end 23, support face 24, bearing pin

25, pin shaft hole 26, shaft hole 27, bossing

28, torsion spring 29, rotating ring 30, connection boss

31, the first stop surface 32, first lug 33, second stop surface

34, screw hole 35, adaptor ring 36, screw hole

37, accepting groove 38, second lug 39, the 3rd stop surface

40, block 41, the 4th stop surface 50, depthkeeping bar

51, regulon 52, gathering sill 53, guiding piece

54, degree of depth indicating member 55, U-type groove 56, chimb

57, the first regulating block 58, second regulating block 59, operation ring

60, guide groove 61, guide block 62, operation aperture

63, internal thread 64, external screw thread 65, fixture block

66, the first locating ring 67, positioning step 68, second locating ring

69, locating convex block 70, lock cell 71, locking ball

72, locking ring 73, lock slots 74, locking hole

75, hole 76, spanner 80, working head is unlocked

81, unit 82, support portion 83, carrier unit is helped

84, reset switch 85, installing hole 86, installing hole

87, chute 88, position stop piece 89, limit element

90, guidance unit 91, bearing pin 92, step surface

93, chimb 94, the shaft shoulder 95, lead foot

96, guide platform 97, second perforation 98, bullport

99, torsion spring 100, screw 101, nut portion

102, threaded portion 103, surface of the work 140, bias piece

141, switch block 142, guard shield 143, installation foot

144, rotating shaft 145, rotary shaft hole 146, butting section

147, operating portion 148, lozenges 149, wedge-like engagement face

601, housing wall 602, connect end 603, openend

604, locating slot 605, positioning strip 606, perforation

607, limiting section 608, stop part 609, stop surface

701, main shaft 702, sleeve 703, screwdriver bit

704, screwdriver bit hole 705, screwdriver bit step 706, magnet

707, main shaft groove 708, fixed axis 709, pilot hole

710, supported hole 711, cannelure 712, guide groove

713, convex shoulder 714, pad 715, steel ball

716, groove 717, travelling gear 801, rotating shaft

802, claw 803, bracing frame 804, split ring

805, U-shaped frame 806, U-shaped arm 807, perforation

808, guide post 809, first guide hole 810, guide springs

811, pin shaft hole 812, support face 813, contact point

814, rotating shaft 815, moving block 816, retaining wall

817, groove 818, guide groove 819, lug

820, blind end 821, open end 822, blind end

823, open end 824, stopper section 825, first contact surface

826, the second contact surface 827, keeper 828, holding tank

830, spatial accommodation 831, support member 832, support platform

833, the first perforation 834, guide ribs 835, connector

836, guide step 837, abut block 838, abut step

901, skewed slot 902, the 3rd end 903, the 4th end

904, gripper shoe 905, annular wall 906, catching step

907, feet 908, support column 909, abutting part

910, baffle plate 911, raised line 912, support rim

913, the second guide hole 914, driving chip 915, inclined-plane

916, salient point 917, reduction box casing

The axis D0 of C, bearing pin, radial spacing H0, axial spacing

X, output shaft axis d, gap

Detailed description of the invention

The screw instrument 1 of one embodiment of the invention as shown in Figure 1 to Figure 7 shows the.Screw 100 can be hammered into workpiece (not shown) along operative orientation (in Fig. 1 shown in arrow) by this screw instrument 1.Screw instrument 1 mainly comprises the screw supporting device 2 helping screw 100 in the course of the work.At screw instrument 1, screw 100 is screwed in the process of workpiece, screw supporting device 2 helps screw 100 to make screw 100 remain coaxial with the output shaft axis X of screw instrument 1, and in most cases, screw 100 be arranged in parallel with the normal direction of surface of the work 103.Such screw 100 can not produce because of the vibration of screw instrument 1 generation and rock or throw off working head or depart from original location in the process being screwed into workpiece, thus screw 100 can be screwed into workpiece by operator easily, like a cork.Screw instrument 1 can be hand-operated tools also can be electric tool.In the present embodiment, screw instrument 1 can be electric screwdriver.Electric screwdriver is the common instruments of those skilled in that art, and it exports a rotary power to screw 100 by output shaft, and screw 100 is squeezed into workpiece.Screw supporting device 2 is positioned at the front end of screw instrument 1 along operative orientation (in Fig. 1 shown in arrow), and the fixed forms such as its draw-in groove by screw, form fit are connected with the shell 3 of screw instrument 1.Be provided with motor (not shown) in shell 3, motor produces power and passes to screw supporting device 2 by output shaft 10 (shown in Fig. 5).The axis X of output shaft 10 is arranged along operative orientation.Screw supporting device 2 drives screw 100 to hammer into workpiece.Here the power source of CD-ROM drive motor both can be the power line that power brick also can be external.There is in the rear end of screw instrument 1 handle 4 for gripping.Handle 4 departs from output shaft axis X and arranges, and certainly in other examples, handle 4 also can be arranged along output shaft axis X, and whole like this screw instrument 1 is linear pattern structure.Handle 4 can also be arranged to around a pivot axis in addition, user-friendly convenience.Handle 4 is also provided with starting switch 5.Starting switch 5 is for starter.For convenience, operative orientation also can be referred to as longitudinal direction.Longitudinal front end is longitudinally near one end of screw supporting device 2, corresponding with longitudinal rear end.Longitudinal rear end is longitudinally near one end of the handle 4 of screw instrument 1, corresponding with longitudinal front end.

Composition graphs 1 to Fig. 2, screw supporting device 2 mainly comprise connect with screw instrument 1 housing 6, for abut screw 100 abutting agency 7, can be used for for helping the support mechanism of screw 100 and driving the driving mechanism helping mechanism to help screw 100.From Fig. 1 to Fig. 4, housing 6 is roughly in cuboid structure in the present embodiment.The housing 6 of cuboid extends longitudinally and inner hollow, and simultaneously housing 6 two ends longitudinally all have opening and pass for longitudinal axis X.The housing 6 of hollow has the housing wall 601 around longitudinal axis X.In the present embodiment, housing wall 601 is made up of two symmetrical half shells.Certain housing wall 601 also can be integrally formed.The inside of housing wall 601 forms spatial accommodation, and namely the part body of screw supporting device 2 is positioned at this spatial accommodation.Thus housing wall 601 mainly prevents screw supporting device 2 internal structure to be damaged, and protect operator, make it touch the internal structure of screw supporting device 2 in operation and to damage.Housing wall 601 have near one end of handle 4 connect with the shell 3 of screw instrument 1 connect end 602, the other end of housing wall 601 this end dorsad then forms the openend 603 with opening.The opening of openend 603 passes for longitudinal axis X, and the subelement of screw supporting device 2 is positioned at outside housing 6 through this opening.

As shown in Figures 2 to 5, abutting agency 7 mainly includes main shaft 701 and the sleeve 702 be socketed on main shaft 701.Main shaft 701 is positioned at the inner space of housing wall 601 hollow and extends longitudinally.The output shaft 10 of one end power attachment screw instrument 1 of main shaft 701, the screwdriver bit 703 of the other end of main shaft 701 then attachment screw instrument 1.One end grafting that main shaft 701 connects output shaft 10 enters in the delivery outlet of output shaft 10.One end that main shaft 701 connects output shaft 10 has the main shaft groove 707 running through main shaft 701 center.Main shaft groove 707 vertical longitudinal axis X is arranged.Simultaneously the hole wall of the delivery outlet of output shaft 10 is provided with output magazine 11, and output magazine 11 is arranged on delivery outlet in circumferentially annular.Be inserted into the delivery outlet of output shaft 10 at main shaft 701 after, main shaft groove 707 is just in time mapped with output magazine 11, and a fixed axis 708 can radially successively through output magazine 11 and main shaft groove 707.In preferably embodiment, output magazine 11 width is longitudinally greater than main shaft groove 707 width longitudinally, the assembling of be more convenient for like this fixed axis 708 and output magazine 11, main shaft groove 707.Such main shaft 701 is connected with output shaft 10 axial restraint, ensures to fall down from the delivery outlet of output shaft 10 by main shaft 701.But main shaft 701 can rotate around longitudinal axis X together with output shaft 10.The rotary driving force that motor produces is passed to main shaft 701 by output shaft 10 in this way, and main shaft 701 is rotated around longitudinal axis X, thus drives and be positioned at the screw 100 that main shaft 701 connects that one end of screwdriver bit 703 and rotate.Main shaft 701 is also provided with the convex shoulder 713 that circumference is arranged.The effect of convex shoulder 713 be with other elements against and provide a supporting role.In the present embodiment, convex shoulder 713 is positioned at that one end that main shaft 701 connects screwdriver bit 703.That one end that main shaft 701 connects screwdriver bit 703 also has screwdriver bit hole 704.Screwdriver bit hole 704 is longitudinally arranged, and screwdriver bit 703 can insert with screwdriver bit hole 704.

As shown in Figure 5, have the radial screwdriver bit step 705 arranged in screwdriver bit hole 704, the bottom of screwdriver bit 703 is then resisted against on screwdriver bit step 705.In the space between the bottom and the bottom of screwdriver bit 703 in screwdriver bit hole 704, magnet 706 can be set for holding screwdriver bit 703 simultaneously.Certainly also can not arrange magnet 706 in other embodiments can't affect enforcement of the present invention.Screwdriver bit 703 longitudinally axis X is arranged.The top of screwdriver bit 703 then longitudinally abuts screw 100.As shown in Figure 2, screw 100 comprises nut portion 101 and threaded portion 102.Nut portion 101 is positioned at one end of screw 100, and it is structure roughly coning.The bottom surface in nut portion 110 has the engagement decorative pattern of depression.In various embodiments, decorative pattern can be protruding yi word pattern or cross etc.These engagement decorative patterns just in time close with the decorative pattern matching form on screwdriver bit 703 top.Screw 100 and screwdriver bit 703 are engaged closely, and screwdriver bit 703 rotates and screw 11 also can be driven correspondingly to rotate.Threaded portion 102 roughly becomes slim cylindrical construction, and its side surface is provided with screw thread.When whole screw 100 rotates with screwdriver bit 703, the screw thread of rotation and absorption surface thus make screw 100 pierce workpiece.In other examples, the top of screwdriver bit 703 is then provided with magnetic element for longitudinally adsorbing screw 100.Certainly the suction type of the absorption screw 100 that other can be stable is also within the scope of the present invention.It should be noted that screwdriver bit 703 in addition at least in part through the openend 603 of housing 6, the top of the absorption screw 100 of screwdriver bit 703 is positioned at outside housing 6.The screwdriver bit 703 of one type can connect with the screw of adaptive this kind of screwdriver bit 703.When needing to connect the screw of other types or changing screwdriver bit 703 because of other demands, user can use instrument easily or manually screwdriver bit 703 taken out from the screwdriver bit hole 704 of main shaft 701 and change.

Sleeve 702 is socketed in the outside of main shaft 701.Further, sleeve 702 is socketed in that one end connecting output shaft 10 near main shaft 701.The Main Function of sleeve 702 is protection main shafts 701, prevents main shaft 701 other elements of grazing and cause damage when High Rotation Speed.Sleeve 702 is provided with pilot hole 709, conveniently assembles.After main shaft 701 and output shaft 10 assemble, fixed axis 708 is inserted on main shaft groove 707 and output magazine 11 to be fixed simultaneously.Because sleeve 702 is arranged on outside main shaft 701, therefore fixed axis 708 sleeve 702 first can be fixedly connected with main shaft groove 707 and output magazine 11 through after this pilot hole 709 again.Certainly in the present embodiment, sleeve 702 also has other effect, can describe in detail below.

As shown in Figure 1, after abutting agency 7 longitudinally abuts screw 100, mechanism is helped to help from basic vertical longitudinal direction screw 100 again.Mechanism is helped to comprise multiple support part 8 helping screw 100 from different directions.The benefit of such setting can be helped screw more than 100 different directions, thus screw 100 can not be tilted in the process hammering into workpiece.Help the quantity of part 8 to be at least two and help part 8 to be evenly arranged around axis X circumference.What multiple like this support part 8 acted on makes a concerted effort just in time on the screw 100 be positioned in axis X.If the quantity of helping part 8 is 2, then help part 8 just in time symmetrical about axis X for these two; If the quantity of helping part 8 is 3, then help part 8 to be just in time positioned on three summits of equilateral triangle for these three, and axis X is through this equilateral leg-of-mutton center; By that analogy.In the present embodiment, the quantity of helping part 8 is 2.

Because these two are helped part 8 to be symmetrical, therefore part 8 is helped to be described in detail to one of them herein.As shown in Figures 2 to 4, help part 8 mainly include vertical axis X arrange rotating shaft 801, the claw 802 of pivotable and the bracing frame 803 for supporting revolving shaft 801 can be carried out around rotating shaft 801.Bracing frame 803 is formed roughly along the supporting plane of vertical axis X.The central authorities of the supporting plane of bracing frame 803 have the split ring 804 that can hold screwdriver bit 703 and main shaft 701 and pass, and are provided with the U-shaped frame 805 arranged along supporting plane in the edge of split ring 804.When assembling, main shaft 701 is through split ring 804, and the convex shoulder 713 on split ring 804 and main shaft 701 abuts and coordinates, its fixation.In the present embodiment, because the quantity of helping part 8 is symmetrical two, therefore U-shaped frame 805 is also the edge being distributed in split ring 804 about axis X symmetry.Line between two U-shaped framves 805 is right through the center of circle of split ring 804.Each U-shaped frame 805 has two relative U-shaped arms 806, and the U-shaped opening that U-shaped frame 805 is formed radially.Each U-shaped arm 806 is provided with and is respectively equipped with perforation 807.One rotating shaft 801 is just passed two perforation 807 on this U-shaped arm 806 and is fixed on this supporting plane.

In the present embodiment, claw 802 is by helping screw 100 around the mode of rotating shaft 801 pivotable.Claw 802 is roughly arranged in rod-type.Claw 802 is longitudinally through the U-shaped opening of U-shaped frame 805.Claw 802 has first end 21 and the second relative end 22.First end 21 and the second end 22 can not relative movements, but can rotate around rotating shaft 801 simultaneously.First end 21 is for directly contacting with screw 100.The support face 23 contacted with screw 11 is also provided with at the first end 21 of claw 802.Support face 23 is design in V-shape, and such benefit makes support face 23 can have comparatively large contact surface with the side surface of screw 100 to amass, and keeps fully abutting screw 100.In preferably embodiment, support face 23 has the decorative pattern matched with screw 11 screw thread, abut more closely to keep support face 23 and screw 11.In addition in other examples, help face 23 to design for arcwall face, support face 23 and screw 100 so also can be made to keep larger contact area.In addition, the switch block that can carry out pivotable minute angle can also be provided with on first end 21, switch block is established support face 23, and the angle that the support face made like this 23 abuts screw 100 can finely tune to keep support face 23 and the good support angle of screw 100 to a certain extent.It should be noted that, because first end 21 wants clamp screws 100, therefore the first end 21 of claw 802 is positioned at all the time outside housing 6.Second end 22 of claw 802 is then positioned at housing 6.The Main Function of the second end 22 of claw 802 coordinates with other elements in housing 6, and can rotate around rotating shaft 801.The first end 21 of such drive claw 802 is also corresponding turns to the position helping screw 100.In the present embodiment, the second end 22 has the pin shaft hole 25 that accommodation one bearing pin 24 passes.The setting direction of bearing pin 24 and the setting direction of rotating shaft 801 are parallel to each other.The effect of bearing pin 24 can be described in detail after a while.The shaft hole 26 passed for holding rotating shaft 801 is provided with in addition between the first end 21 and the second end 22 of claw 802.Shaft hole 26 is closer to the second end 22.The distance of shaft hole 26 to the second end 22 is less than the distance of shaft hole 26 to first end 21.Thus make the rotation arm of force of the second end 22 be less than the rotation arm of force of first end 21.This is because the second end 22 of claw 802 is positioned at housing 6, for the ease of whole screw supporting device 2 try one's best small and exquisite, the volume in housing 6 can not be too large, and therefore the rotation arm of force of the second end 22 can not be too large.In the present embodiment, first end 21 is greater than 2: 1 to the distance of shaft hole 26 and the second end 22 to the distance of shaft hole 26.In a preferred embodiment, first end 21 is greater than 4: 1 to the distance of shaft hole 26 and the second end 22 to the distance of shaft hole 26.Second end 22 is by other element drives and rotate around rotating shaft 801, thus drives first end 21 to rotate.Therefore first end 21 at least has two positions and can move between these two positions, and one of them position is in the position helping screw 100, and another position is in the position not helping screw 100.

As shown in Figures 2 to 4, driving mechanism comprises the actuator 9 for driving claw 802 to rotate.Actuator 9 is positioned at housing 6.Actuator 9 has drive division, and this drive division can drive claw 802 to move to the position helping screw 100.In the present embodiment, drive division is the skewed slot 901 that relative axis X tilts.Skewed slot 901 has the 3rd end 902 and the 4th end 903 respectively.3rd end 902 is positioned at the front end longitudinally, and the 4th end 903 is then positioned at the rear end longitudinally; Namely the 3rd end 902 is positioned at the part outside housing 6 closer to screwdriver bit 703, and the 4th end 903 is closer to output shaft 10.Meanwhile, in the radial direction of vertical axis X, the 3rd end 902 is less than the distance of the 4th end 903 to axis X to the distance of axis X.The bearing pin 24 that skewed slot 901 is designed to hold the second end 22 being positioned at claw 802 in addition passes.Bearing pin 24 can produce relative movement along both trends of skewed slot 901 in skewed slot 901.When after generation relative movement, bearing pin 24 is subject to the extruding of skewed slot 901 trough rim, thus drives claw 802 to rotate around rotating shaft 801.In a preferred embodiment, the 3rd end 902 relatively entirety of skewed slot 901 moves towards to bend, and closer to X-axis in the 3rd end 902 radial direction.

Actuator 9 also comprises a gripper shoe 904 in addition.Gripper shoe 904 is roughly square, and the plane orthogonal that gripper shoe 904 is formed is in axis X.Gripper shoe 904 can be contained in the spatial accommodation in housing wall 601.One end of one elastic component 12 longitudinally arranged is connected in this gripper shoe 904.This elastic component 12 is positioned at the side of the longitudinal deflection rear end of gripper shoe 904, and elastic component 12 can longitudinally this actuator 9 of bias voltage, makes actuator 9 have the trend of forward end movement.Meanwhile, this elastic component 12 is socketed in the periphery of sleeve 702.In the central authorities of gripper shoe 904, there is circular opening in addition and be provided with annular wall 905 at this opening towards the side, rear end in longitudinal direction.Main shaft 701 and longitudinally can pass this annular wall 905 around the sleeve 702 of main shaft 701.Longitudinal raised line 911 is also provided with in the inner side of annular wall 905.Meanwhile, be also provided with guide groove 712 in the outside of sleeve 702, raised line 911 and guide groove 712 have cooperatively interacted position-limiting action, make annular wall 905 and sleeve 702 longitudinally relative movement, and can not relatively rotate.As shown in Figure 5, between annular wall 905 and main shaft 701, also locking piece is provided with.Locking piece is used for lock drive part 9, makes actuator 9 overcome the biasing force of elastic component 12.When locking piece meet certain regulate unlock time, actuator 9 just under the partial pressure of elastic component 12 forward end move.In the present embodiment, locking piece is ball 13.Being provided with catching step 906 in the inner side of annular wall 905, longitudinally there is backstop with catching step 906 in ball 13.This backstop can be cancelled out each other with the active force of elastic component 12 biasing support plate 904, thus makes actuator 9 keep transfixion.As we can see from the figure, along vertical axis X in the radial direction, ball 13 radially outward with catching step 906 against, simultaneously ball 13 radially-inwardly leans with main shaft 701.The supported hole 710 that can hold ball 13 is also provided with in addition on the sleeve 702 of socket main shaft 701.Supported hole 710 radially runs through the inner and outer wall of sleeve 702.Namely ball 13 is positioned at this supported hole 710.Because sleeve 702 does not vertically move, the supported hole 710 therefore on sleeve 702 just gives the support force of ball 13 longitudinal direction, and ball 13 can not vertically move in supported hole 710.Therefore, when ball 13, with annular wall 905, backstop occurs, the longitudinal direction of ball 13 all can not move with vertical longitudinal radial direction, and ball 13 is in the state of geo-stationary.Ball 13 has now just locked actuator 9, makes it can not vertically move under the effect of elastic component 12.

As shown in Figure 2, main shaft 701 also comprises the cannelure 711 arranged around main shaft 701 surface circumference.The effect of cannelure 711 holds ball 13 to roll in cannelure 711.The below that ball 13 radial direction abuts the position of main shaft 701 sidewall is positioned at, namely closer to front end on cannelure 711 is longitudinal.Therefore, when External Force Acting makes that main shaft 701 overcomes the biasing force of elastic component 12 and longitudinally rear end moves a certain distance, cannelure 711 is the corresponding position moving to ball 13 and can contact also.Now ball 13 just produces and moves and fall into cannelure 711.Due to ball 13 radial direction producing minute movement, make the contact of the catching step 906 inside ball 13 disengaging and annular wall 905.Unlock so this process is.Under the effect of elastic component 12 biasing support plate 904, actuator 9 moves to longitudinal front end.Illustrate in addition, when ball 13 contacts with catching step 906 again, namely again produce locking action.Therefore, ball 13 just switches repeatedly between lock-out state and released state.Certainly, the present invention does not limit locking piece is ball 13.

Screw supporting device 2 also comprises the feet 907 be positioned partially at outside housing 6.Feet 907 is mainly used in guiding screw 100 and the final screw supporting device 2 that triggers unclamps support to screw 100 hammering in process.In the present embodiment, feet 907 and actuator 9 integration are formed.Feet 907 is positioned at the side that gripper shoe 904 is longitudinally partial to front end.Feet 907 and annular wall 905 just in time lay respectively at the relative both sides of gripper shoe 904.In the present embodiment, feet 907 roughly extends longitudinally.In addition, the quantity of feet 907 is at least two, and feet 907 and claw 802 one_to_one corresponding.Each claw 802 matches with corresponding feet 907.In order to easily manufactured and simplification structure, namely skewed slot 901 is arranged on feet 907.Under the bias voltage of elastic component 12, feet 907 can move longitudinally and not rotatable.Each feet 907 also comprises two support columns be arranged side by side 908 and the abutting part 909 for abutting workpiece.One end of support column 908 is connected to gripper shoe 904, and the other end is then connected to abutting part 909.Abutting part 909 is positioned at the outer and workpiece that abutting part 909 can hammer into screw 100 of housing 6 and abuts.Gripper shoe 904, support column 908 and abutting part 909 can be integrally formed, and also can be fixed by fixed form connects.Two support columns 908 on each feet 907 have certain width, make to form certain space between two support columns 908, and claw 802 is just in time contained in this space.Meanwhile, a pair on U-shaped frame 805 U-shaped arm 806 is positioned at this space equally, and one of them U-shaped arm 806 is resisted against the inner side of one of them support column 908, and another U-shaped arm 806 is resisted against the relative inner of another support column 908.That is, the distance between the relative inner on each feet 907 is substantially identical with the outside width of the U-shaped arm 806 of a pair on U-shaped frame 805.Two support columns 908 on each feet 907 are also respectively equipped with the skewed slot 901 to correspondence.These two corresponding skewed slots 901 overlap completely in the projection that comprises in the plane of axis X.The bearing pin 24 being positioned at the pin shaft hole 25 on claw 802 can through these two corresponding skewed slots 901.Under the effect of external force, bearing pin 24 is 901 relative movements in skewed slot.In addition, actuator 9 is also provided with baffle plate 910.Baffle plate 910 is positioned at the side that gripper shoe 904 has feet 907.And baffle plate 910 is for being arranged on outside sleeve 702 diametrically, the effect of baffle plate 910 stops that the ball 13 in the supported hole 710 of sleeve 702 rolls out.When screw instrument 1 hammers into workpiece screw 100 along operative orientation, feet 907 can abut to surface of the work 103.And surface of the work 103 is supplied to feet and operative orientation just in time opposite effect power.After feet 907 is subject to active force, whole actuator 9 moves along extreme direction after axis X.Such actuator 9 just creates relative movement with support part 8, thus makes support part 8 move to the position not helping screw.In the present embodiment, part 8 is helped to rotate the position extremely not helping screw.And in rotary course, help part 8 can not touch surface of the work 103 thus cause damage to surface of the work 103.

As shown in Figure 1, the element that screw supporting device 2 is positioned at outside the openend 603 of housing 6 mainly comprises: feet 907, help the part claw 802 of part 8 and connect the part screwdriver bit 703 of screw 100.In the present embodiment, screwdriver bit 703 is arranged along axis X, the first end 21 of two claws 802 especially claw 802 is distributed in the both sides of screwdriver bit 703 symmetrically about axis X, two feets 907 corresponding with claw 802 lay respectively at the radial outside of corresponding claw 802.Therefore be screwdriver bit 703, claw 802 and feet 907 from inside to outside successively in the radial direction of axis X.In addition in the vertical, feet 907 is also larger to the ultimate range of housing 6 openend 603 than claw 802 to the ultimate range of housing 6 openend 603.And claw 802 is also larger to the ultimate range of housing 6 openend 603 than screwdriver bit 703 to the ultimate range of housing 6 openend 603.

Screw supporting device 2 is performed such work: as shown in Figure 7, first, screw 100 is plugged into screwdriver bit 703 and engages with screwdriver bit 703 decorative pattern.Engagement process in, screw 100 can promote screwdriver bit 703 slightly longitudinally rear end move.The main shaft 701 that screwdriver bit 703 can promote again to hold screwdriver bit 703 longitudinally moves rear end.That is, the fitting 7 of abutting screw 100 is made to move longitudinally.Then, along with the movement of main shaft 701, the position that ball 13 lives catching step 906 from original backstop moves in the cannelure 711 main shaft 701, and backstop action is disappeared.That is, locking piece relieves the unblock effect to actuator 9.Then, under the bias effect of elastic component 12, elastic component 12 longitudinally promotes gripper shoe 904, and actuator 9 entirety is longitudinally moved front end.The bearing pin 24 of the skewed slot 901 on actuator 9 in skewed slot 901 is so just made to move.Finally, in moving process, skewed slot 901 is supplied to bearing pin 24 and provides active force, makes bearing pin 24 901 move to the 4th end 903 from the 3rd end 902 in skewed slot.Claw 802 is just driven to rotate around rotating shaft 801 in bearing pin 24 moving process.Such actuator 9 just drives helps part 8 to move to the position helping screw 100.The support face 23 of claw 802 first end 21 never helps the position of screw 100 to move the position helping screw 100 in rotation process, and final realization helps screw 100.Such benefit is that user does not need to provide extra operation, only needs screw 100 to be plugged into screwdriver bit 703 just can realize screw supporting device 2 automatically help screw 100.

It should be noted that actuator 9 has the trend of longitudinally front end movement under the effect of elastic component 12, the skewed slot 901 on actuator 9 is abutted to all the time the second end 22 that claw 802 has pin shaft hole 25.What the active force abutting generation thus made that the first end 21 of claw 802 can be stable helps screw 100.That is, the holding power that skewed slot 901 provides makes claw 802 stably clamp screw 100, and screw 100 is not easy to rock in the course of the work.

After the work of clamp screws 100 completes, screw instrument 1 starts, along operative orientation, screw 100 is squeezed into workpiece.In general, operative orientation overlaps with the normal direction of surface of the work 103, can ensure that screw 100 can squeeze into workpiece as the crow flies like this.After screw 100 and screwdriver bit 703 connect and helped part 8 to help, the tip of the threaded portion 102 of screw 100 is greater than the ultimate range H2 of feet 907 to openend 603 to the distance H1 of openend 603.Therefore screw 100 first hammers into workpiece, and after hammering into a segment distance H3, feet 907 abuts to surface of the work 103.Here H3 equals H1 and deducts H2.Then continue to be screwed into screw 100, feet 907 is subject to the support force of the longitudinally rear end that surface of the work 103 provides.Under the effect of this support force, whole actuator 9 overcome elastic component 12 to its biasing force longitudinally rear end move.Meanwhile, the skewed slot 901 on actuator 9 also moves relative to bearing pin 24, and bearing pin 24 is moved from the 4th end 903 to the 3rd end 902.In moving process, screw 100 has hammered into a segment distance H4 to workpiece again.Bearing pin 24 drives claw 802 801 to rotate around the shaft, and the first end 21 of claw 802 has just departed from the support to screw 100 gradually.Now due to screw 100, to have hammered into workpiece very dark, though therefore now claw 802 do not help screw 100, also can ensure that screw 100 squeezes into workpiece as the crow flies.Final bearing pin 24 is moved to the 3rd end 902 of skewed slot 901, and therefore whole claw 802 also returns to the position of original not clamp screws 100.Therefore whole screw supporting device 2 automatically achieves again getting loose and resetting to initial position screw 100, thus convenient screw next time hammers into work.

In an additional preferred embodiment, as shown in Figures 3 to 6, there is in the housing 6 of screw supporting device 2 receiving space that part 8 is helped in collecting.Part 8 is helped operationally to move in receiving space.Help part 8 to have at least two positions, wherein primary importance namely as shown in Figure 5.In primary importance, help part 8 major part to be positioned at outside housing 6, actuator 9 can drive helps part 8 to turn to the position helping screw 100.In the second place namely as shown in Figure 6, help part 8 relative to primary importance longitudinally axis X move and be housed inside in receiving space.In the second place, help part 8 cannot be used for helping screw by operation.Screw supporting device 2 also comprises gauge tap 14.The Main Function of gauge tap 14 is that support part 8 is switched between the first position and the second position.If gauge tap 14 makes support part 8 be in primary importance, screw supporting device 2 is in the state can carrying out support work, and so screw supporting device 2 coordinates whole screw instrument 1 just can automatically clamp screw or get loose in the process of oncomelania nail.If gauge tap 14 makes support part 8 be in the second place, then screw supporting device 2 is in idle state, so screw instrument 1 just can hammer into screw as other common screw instruments (such as electric screwdriver), and in this process, screw supporting device 2 cuts little ice.So just make user under two kinds of functional statuses, can select more to meet the function of oneself demand like a cork.

In the present embodiment, gauge tap 14 comprises a rotatable switch block 141 and the guard shield 142 for the protection of switch block 141.Guard shield 142 is removably installed on housing wall 601.Guard shield 142 is provided with installation foot 143, installation foot 143 and housing wall 601 snap-fit engagement.The overwhelming majority of switch block 141 is arranged in guard shield 142, simultaneously guard shield 142 has an opening and makes the sub-fraction of switch block 141 expose outside guard shield 142, and this part is in order to for user operation.Switch block 141 can rotate around a rotating shaft 144.The rotary shaft hole 145 that accommodation rotating shaft 144 passes is arranged on switch block 141.The bias piece for bias voltage switch block 141 is also provided with in rotary shaft hole 145.Switch block 141 comprises and can be used for abutting the butting section 146 of screw supporting device 2 and supplies user to carry out the operating portion 147 operated.In the present embodiment, butting section 146 and operating portion 147 are angularly fixedly installed.Butting section 146 and operating portion 147 can be integrally formed, thus butting section 146 and operating portion 147 are rotated around rotating shaft 144.When user's pressing operations portion 147 makes operating portion 147 rotate, operating portion 147 can drive butting section 146 to rotate around rotating shaft 144 equally.As can be seen from Figure 4, butting section 146 and operating portion 147 are roughly arranged in L-type.Operating portion 147 is positioned at outside guard shield 142, and operating portion 147 has the larger operate tablet of a contact area, and user pushes this operate tablet can make operating portion 147 rotate.One end of butting section 146 is near rotary shaft hole 145, and the other end is roughly in grab shape.Lozenges 148 should be had in one end in grab.On actuator 9, be provided with a wedge-like engagement face 149 simultaneously.In the present embodiment, wedge-like engagement face 149 is arranged at the edge of gripper shoe 904.Certainly, in other embodiments, wedge-like engagement face 149 also can be arranged on other positions on actuator 9.Can match with lozenges 148 in wedge-like engagement face 149.

As shown in Figure 5 and Figure 6, actuator 9 be subject to External Force Acting and overcome the biasing force of elastic component 12 and longitudinally rear end is moved time, wedge-like engagement face 149 on actuator 9 can and butting section 146 on lozenges 148 offset.Then, under the continuous action of external force, lozenges 148 and wedge-like engagement face 149 relative sliding also finally make the wedge-like engagement face 149 on actuator 9 depart from and the abutting of lozenges 148.Under the effect of bias piece 140, lozenges 148 abuts to gripper shoe 904 towards on the side of longitudinal front end, and is supplied to the holding power of actuator 9 longitudinally rear end.Such abutting part 146 just abuts and fixed drive part 9, and actuator 9 cannot freely be moved longitudinally.Position when now the position of actuator 9 does not abut compared to butting section 146, longitudinally rear end moves a segment distance.Under this position, screw 100 abuts to screwdriver bit 703 and screw instrument 1 drives screw 100 to be screwed into the process of workpiece, and the support part 8 of screw supporting device 2 and actuator 9 all can not move or help screw 100.This time, screw instrument 1 carried out work to screw 100 just as normal screws is criticized.When user pulls operating portion 147 as required, operating portion 147 drives butting section 146 to rotate around rotating shaft 144.The abutting of rear disengaging to actuator 9 is rotated in butting section 146, actuator 9 under the bias effect of elastic component 12 longitudinally front end move.Support part 8 can be driven again to help screw 100 when moving into place rear-guard moving part 9.Such user just can control screw supporting device 2 easily and whether carry out support screw 100, and does not need extra screw supporting device 2 is disassembled from screw instrument 1.Certainly, gauge tap 14 is also not limited to the form of switch block, and gauge tap 14 also can adopt common slipping switch or contact witch etc.

Screw supporting device 2 is connected with the shell 3 of screw instrument 1 by the end 602 that connects of housing 6.As shown in Figure 4, what connect end 602 is circumferentially with locating slot 604 along axis X.Locating slot 604 can annular be arranged, and also can squarely arrange.On shell 3, be provided with the positioning strip 605 of circumference simultaneously.The circumferential convex of positioning strip 605, makes positioning strip 605 just in time clamping can enter locating slot 604.When after locating slot 604 and positioning strip 605 clamping, the shell 3 of whole screw supporting device 2 and screw instrument 1 is fixed along axis X direction, but screw supporting device 2 relatively rotates around axis X.

To describe in detail below.Connect end 602 and be provided with towards the plane of shell 3 perforation 606 that drive tab 15 that receiving sleeve 702, output shaft 10 and circumference contain output shaft 10 passes.Within one week around perforation 606, be all provided with limiting section 607.The effect of limiting section 607 mainly limits the relative rotation of screw supporting device 2 around axis X.Limiting section 607 is also radially outward arranged at the edge of perforation 606.Limiting section 607 evenly arranging for a week around perforation 606 also can be uneven setting, such as, be arrange in the angle of going forward one by one.As shown in the figure, limiting section 607 is stopper slots.Certainly in other embodiments, limiting section 607 also can be spacing hole or other forms.The surface of drive tab 15 is provided with the radial dead eye 16 arranged.After assembling, dead eye 16 can form spacing space with limiting section 607 radial communication of one of them.The spring 18 of shape for hat component 17 and radial bias voltage shape for hat component 17 is provided with in this spacing space.One end of spring 18 abuts to the bottom of dead eye 16, the other end of spring 18 to be connected on shape for hat component 17 and bias voltage shape for hat component 17 in limiting section 607.Such shape for hat component 17 pairs of limiting sections 607 have position-limiting action circumferentially, can prevent the drive tab 15 connecting the relative output shaft 10 of end 602 from relatively rotating to a certain extent.After assembling, as shown in Figure 1, part 8 and whole screw supporting device 2 is helped to be in primary importance relative to the handle 4 gripped.When user apply external force make housing 6 connect end 602 rotate around axis X time, perforation 606 edge radial direction press down shape for hat component 17, make shape for hat component 17 be communicated with spring-compressed in dead eye 16.So just relieve the position-limiting action of shape for hat component 17 pairs of limiting sections 607.Operator can milli unresisted rotating screw supporting device 2 housing 6, make support part 8 relative to handle 4 position produce change.Stop operating after the position that user wants is thought in arrival, then, under the bias effect of spring 18, shape for hat component 17 enters in limiting section 607 and again carries out spacing to limiting section 607.Now as shown in Figure 2, part 8 and whole screw supporting device 2 is helped to be in the second place relative to the handle 4 gripped.According to different environments for use, by such mode, the position of screw supporting device 2 opposite handle 4 can angularly be regulated arbitrarily.

As shown in Figs. 8 to 11, be the screw instrument 1 of second embodiment of the invention.Similar with the first embodiment of the present invention, this screw instrument 1 comprises the screw supporting device 2 helping screw 100 in the course of the work equally.Screw supporting device 2 is connected with the shell 3 of screw instrument 1.Screw supporting device 2 mainly comprise connect with screw instrument 1 housing 6, for abut screw 100 fitting 7, can be used for for helping the support part 8 of screw 100 and driving the actuator 9 helping part 8 to help screw 100.

In second embodiment and the first embodiment, same or analogous place does not just describe in detail, highlights both differences below.Fitting 7 comprises main shaft 701 of knowing clearly, is socketed in the sleeve 702 on main shaft 701 and connects the screwdriver bit 703 of main shaft 701.Main shaft 701 has convex shoulder 713 near one end of screwdriver bit 703, and convex shoulder 713 is for split ring 804 part of supported frame 803.In the present embodiment, pad 714 and steel ball 715 is also provided with between convex shoulder 713 and bracing frame 803.In addition, actuator 9 is provided with U-shaped frame 805 part of support rim 912 for supported frame 803.Guide post 808 is also provided with between actuator and bracing frame 803.Guide post 808 is longitudinally arranged.Guide post 808 is each passed through the first guide hole 809 on bracing frame 803 and the second guide hole 913 on actuator 9.In the present embodiment, the first guide hole 809 is blind hole.First guide hole 809 is positioned at U-shaped frame 805 part.And the second guide hole 913 is through hole.Second guide hole 913 is positioned in the gripper shoe 904 on actuator 9.By the guiding function of this guide post 808, actuator 9 and U-shaped frame 805 can only along the bearing of trend relative movements of guide post 808.In the present embodiment, as shown in Figure 10, the quantity of guide post 808 is two, and is symmetrical arranged around axis X, and lays respectively on the U-shaped arm 806 of corresponding U-shaped frame 805.Guide post 808 is also arranged with guide springs 810.Guide springs 810 one end abuts on bracing frame 803, and the other end abuts in the gripper shoe 904 of actuator 9.Guide springs 810 effect is here to provide bias effect.

In a second embodiment, the drive division of actuator 9 has not been skewed slot 901.As shown in Figure 10 and Figure 11, the side near feet 907 in gripper shoe 904 is provided with driving chip 914, and driving chip 914 extends along axis X.Driving chip 914 is provided with inclined-plane 915.Inclined-plane 915 is positioned at driving chip 914 along on the side of axis X radial direction, and this side is radially outward arranged.Inclined-plane 915 relative axis X is obliquely installed, and that is has angle between the normal direction on inclined-plane 915 and the radial direction of axis X, in the scope of angle between 5 degree to 30 degree.Preferably, the scope of this angle is between 10 degree to 20 degree.Inclined-plane 915 has the 3rd end 902 and the 4th end 903 too.3rd end 902 is positioned at the front end longitudinally, and the 4th end 903 is then positioned at the rear end longitudinally; In the radial direction of vertical axis X, the 3rd end 902 is less than the distance of the 4th end 903 to axis X to the distance of axis X.Inclined-plane 915 namely as the drive division of actuator 9, for help the second end 22 of part 8 to abut.In the present embodiment, the second end 22 has semi-cylindrical bossing 27.This bossing 27 is protruding towards inclined-plane 915, and directly abuts with inclined-plane 915.Because this bossing 27 is semi-cylindrical, therefore can ensure that this bossing 27 always linearly contacts with inclined-plane 915.Certainly be not limited to this, other can keep the structure linearly contacted also to be fine with inclined-plane 915.The bossing 27 of the second end 22 can slide abutting between the 3rd end 902 on inclined-plane 915 and the 4th end 903.Because inclined-plane 915 and support part 8 are all that rigid material is made, the contact therefore helping part 8 and the second end 22 is rigid contact.Second end 22 of the inclined-plane 915 in addition on actuator 9 and support part 8 is corresponding, namely helps the second end 22 of part 8 to abut mobile on an inclined-plane 915 and not interfere with each other for one.In the present embodiment, the quantity of claw 802 is two and is symmetrical arranged about axis X, and therefore inclined-plane 915 also has two and is symmetrical arranged about axis X.

The rotating shaft 26 of claw 802 is also provided with torsion spring 28.The effect of torsion spring 28 is second ends 22 to the direction bias voltage claw 802 not helping screw.Certainly in other examples, torsion spring 28 equally can the first end 21 of bias voltage claw 802.When claw 802 is positioned at the position not helping screw, torsion spring 28 bias voltage claw 802 makes claw 802 maintain the position not helping screw.

When screw 100 is plugged in screwdriver bit 703, screw 100 drapes over one's shoulders 703 by promotion makes main shaft 701 vertically move.Along with the movement of main shaft 701, the position that ball 13 lives catching step 906 from original backstop moves in the cannelure 711 main shaft 701, and backstop action is disappeared.Then, under the bias effect of elastic component 12, actuator 9 entirety longitudinally front end moves inclined-plane 915 is moved relative to the second end 22 be connected on inclined-plane 915.Such actuator 9 just drives the second end 22 just to move to the 4th end 903 from the 3rd end 902 on inclined-plane 915.Inclined-plane 915 is supplied to the second end 22 to the active force helping screw position deflection, and claw 802 rotates around rotating shaft 801.Claw 802 never helps the position of screw 100 to move the position helping screw 100 in rotation process, and final realization helps screw 100.

After the work of clamp screws 100 completes, screw instrument 1 starts, along operative orientation, screw 100 is squeezed into workpiece.Screw 100 first hammers into workpiece, and after hammering into a segment distance, feet 907 abuts to surface of the work 103.Then continue to be screwed into screw 100, feet 907 is subject to the support force of the longitudinally rear end that surface of the work 103 provides.Under the effect of this support force, whole actuator 9 overcome elastic component 12 to its biasing force longitudinally rear end move.Meanwhile, the inclined-plane 915 on actuator 9 also moves relative to the second end 22 of claw 802, and the second end 22 is moved from the 4th end 903 on inclined-plane 915 to the 3rd end 902.In moving process, the second end 22 drives claw 802 801 to rotate around the shaft, and the first end 21 of claw 802 has just departed from the support to screw 100 gradually.Claw 802 moves to from the position of support screw 100 position not helping screw 100 in rotation process.Torsion spring 28 bias voltage claw 802 in rotating shaft 801 makes claw 802 maintain the position not helping screw.

Screw supporting device 2 is also provided with rotating ring 29.Rotating ring 29 is fixedly connected with housing 6.As shown in Figure 9, what rotating ring 29 was roughly coupled to housing 6 connects end 602.Rotating ring 29 is provided with and connects boss 30., connect boss 30 and be provided with the screw hole 34 longitudinally arranged, be fixedly connected with the screw hole on housing 6 through this screw hole 34 for setting tools such as screws.Connect boss 30 circumference to be arranged on equably on rotating ring 29.In the present embodiment, the quantity connecting boss 30 is two.Connect being symmetrical arranged about axis X of boss 30.Meanwhile, connect boss 30 in the circumference of rotating ring 29, form the first stop surface 31.Meanwhile, the ring body of rotating ring 29 is also provided with the first lug 32 towards radially inner side direction.Be connected the position class of boss 30 seemingly, the same circumference of the first lug 32 is arranged equably.In the present embodiment, the first lug 32 quantity is about axis X symmetrically arranged two.First lug 32 is longitudinally arrange with being connected boss 30.Connect boss 30 closer to longitudinal front end, the first lug 32 is closer to longitudinal rear end.As shown in the figure, the first lug 32 forms the second stop surface 33 in the circumference of rotating ring 29.First stop surface 31 and the second stop surface 33 roughly longitudinally step are arranged.The effect of the first stop surface 31 and the second stop surface 33 can be described in detail after a while.

Screw instrument 1 is provided with the adaptor ring 35 connected with rotating ring 29.Adaptor ring 35 with longitudinally connect with rotating ring 29, and adaptor ring 35 and rotating ring 29 can relatively rotate around axis X.Adaptor ring 35 is provided with screw hole 36, and the setting tools such as screw are fixedly connected with the element in screw instrument 1 through screw hole 36.This element and screw instrument 1 are relatively-stationary.Thus adaptor ring 35 is fixedly connected with screw instrument 1.In the present embodiment, this element is the reduction box casing 917 in screw instrument 1.Adaptor ring 35 is provided with annular accepting groove 37 towards the side of longitudinal front end.The effect of accepting groove 37 is accommodated and is abutted one end of elastic component 12.The radial outside of adaptor ring 35 is provided with the second lug 38.Second lug 38 is circumferentially with the 3rd stop surface 39.The first stop surface 31 on 3rd stop surface 39 and rotating ring 29 mutually abuts thus forms backstop.After adaptor ring 35 and rotating ring 29 produce relative rotation, the 3rd stop surface 39 produces backstop action with another first stop surface 31 on rotating ring 29 again.Meanwhile, adaptor ring 35 is also provided with block 40.Block 40 radially arranged outside.The longitudinally front and back of block 40 and the second lug 38 are arranged, and block 40 is near longitudinal front end, and the second lug 38 is near longitudinal rear end.Block 40 is circumferentially with the 4th stop surface 41.The situation producing backstop with the first stop surface 31 and the 3rd stop surface 39 is similar, and the second stop surface 33 on the 4th stop surface 41 and rotating ring 29 mutually abuts thus forms backstop.

When adaptor ring 35 relatively rotates rotating ring 29, thus screw supporting device 2 is turned an angle around the relative screw instrument 1 of axis X.So just can the relative position of adjustment screw supporting device 2 and screw instrument 1.Facilitate screw supporting device 1 to help screw 11 under different occasions, such as, in corner or skewed slot from the benefit of like this design.Which thereby enhance the operability of screw supporting device 1.In the present embodiment, the anglec of rotation of setting is 90 degree.

As shown in Figure 12 to Figure 15, it is the screw instrument 1 of the third embodiment of the present invention.Similar with the second embodiment of the present invention, this screw instrument 1 comprises the screw supporting device 2 helping screw 100 in the course of the work equally.Screw supporting device 2 is connected with the shell 3 of screw instrument 1.Screw supporting device 2 mainly comprise connect with screw instrument 1 housing 6, for abut screw 100 fitting 7, can be used for helping the support part 8 of screw 100 and drive the actuator 9 helping part 8 to help screw 100.

In 3rd embodiment and the second embodiment, same or analogous place does not just describe in detail, highlights both differences below.Screw supporting device 2 comprises depthkeeping unit 20.The Main Function of depthkeeping unit 20 limits the degree of depth that workpiece squeezed into screw by screw instrument 1.After screw enters workpiece and arrives the degree of depth preset, the power transmission that namely depthkeeping unit 20 controls screw instrument 1 disconnects.Thus the fitting 7 abutting screw 100 cannot receive power, makes fitting 7 stop the rotation.Operator can know that screw is driven into predetermined depth.

Depthkeeping unit 20 mainly comprises depthkeeping bar 50 and for regulating the regulon 51 of depthkeeping bar 50 depthkeeping distance.Depthkeeping bar 50 can move longitudinally.In order to ensure the mobile accuracy of depthkeeping bar 50, the inwall of housing 6 is provided with gathering sill 52 extending longitudinally.The cross sectional shape of gathering sill 52 is trapezoidal.In other examples, gathering sill also can have the cross section of other shapes, such as cross, triangle, hook-type etc.The guiding piece 53 coordinating gathering sill 52 is correspondingly provided with at depthkeeping bar 50.The cross sectional shape of guiding piece 53 and gathering sill 52 coordinates, and guiding piece 53 longitudinally can be slided on gathering sill 52.Guiding piece 53 is fixedly connected on depthkeeping bar 50 by screw or fixture.As shown in Figure 12 and Figure 13, depthkeeping bar 50 partly stretches out in outside housing 6.One end that depthkeeping bar 50 is exposed to housing 6 has degree of depth indicating member 54.Degree of depth indicating member 54 is arranged along the radially inner side of axis X.Degree of depth indicating member 54 is fixed on one end of depthkeeping bar 50 by fixtures such as screws.Degree of depth indicating member 54 has the depthkeeping face that can abut surface of the work, and this depthkeeping face and surface of the work can fit tightly.The other end of depthkeeping bar 50 is then positioned at housing 6.This end of depthkeeping bar 50 then connects regulon 51.Depthkeeping bar 50 can be fixedly connected with regulon 51, also only can longitudinally be fixedly connected with regulon 51.In the present embodiment, depthkeeping bar 50 is longitudinally fixedly connected with.This end of depthkeeping bar 50 has U-type groove 55.Regulon 21 has the chimb 56 of annular simultaneously, and chimb 56 can enter in U-type groove 55 in clamping.Such depthkeeping bar 50 is connected to the annular optional position of a week of chimb 56, thus depthkeeping bar 50 can be relatively rotated by relative adjustment unit 51.Meanwhile, depthkeeping bar 50 is longitudinally fixing with regulon 51 again.When one end that depthkeeping bar 50 has depthkeeping face longitudinally abuts to surface of the work 13, the active force that depthkeeping bar 50 is subject to workpiece and provides correspondingly vertically moves with regard to promoting regulon 51.In the present embodiment, the quantity of depthkeeping bar 50 is two, and around the setting of axis X symmetry.Therefore, depthkeeping bar 50 just in time with claw 802 and feet 907 one_to_one corresponding.

Regulon 51 mainly comprises the first regulating block 57 connecting depthkeeping bar 50, the second regulating block 58 coordinated with the first regulating block 57 and carries out the adjustable ring 59 that operates to user.As shown in Figure 13 and Figure 14, the first regulating block 57 forms the annular ring be made up of annular wall of a hollow.The hollow space of its annular ring passes for fitting 7.The outside of this annular wall has U-type groove 55 clamping of chimb 56 for depthkeeping bar 50 of circumference setting.Make depthkeeping bar 50 and the first regulating block 57 longitudinally fixing like this, both can only vertically move together.In addition, the U-type groove 55 of depthkeeping bar 50 can be slided arbitrarily again on chimb 56, and therefore depthkeeping bar 50 and the first regulating block 57 can relatively rotate around axis X.The outside of annular wall is also circumferentially with guide groove 60 extending longitudinally in addition.Correspondingly on the inner peripheral surface of adjustable ring 59 be provided with guide block 61, guide block 61 can be connected in guide groove 60 and to slide along guide groove 60, thus plays guide effect.First adjustable ring 57 and operation ring 59 can not be relatively rotated.Certainly in other embodiments, guide groove 60 also can be arranged on adjustable ring 59, and the first regulating block 57 arranges guide block 61.The housing 6 of screw supporting device 2 is provided with operation aperture 62, makes operation ring 59 partly be exposed to this operation aperture 62.User can rotate this operation ring 59 by operation aperture 62 and then band the first regulating block 57 rotates together.In preferred embodiment, the part that operation ring 59 is positioned at operation aperture 62 can also be provided with spanner, to facilitate user's rotating operation ring 59.

The second regulating block 58 is also socketed with at the hollow space of the first regulating block 57.The annular wall inner peripheral surface of the first regulating block 57 is provided with internal thread 63 for being connected with the second regulating block 58.Second regulating block 58 forms the annular ring of a hollow equally.The hollow space of its annular ring passes for fitting 7.The outer peripheral face of the second regulating block 58 is provided with the external screw thread 64 with the first regulating block 57 threaded engagement.Due to the effect of being threaded of internal and external threads, the first regulating block 57 can be relatively rotated by relative second regulating block 58.And in threads turn process, the fore-and-aft distance of the first regulating block 57 and the second regulating block 58 changes.In addition, when the first regulating block 57 vertically moves, the first regulating block 57 promotes the second regulating block 58 equally and vertically moves.Therefore the first regulating block 57 vertically moves when there is not relative rotation together with the second regulating block 58.Second regulating block 58 also has the fixture block 65 inwardly stretched towards footpath.Fixture block 65 is connected on output shaft 10, and the second regulating block 58 can be vertically moved with output shaft 10.The travelling gear engaging each other to transmit power is provided with between screw instrument 1 and screw supporting device 2.Particularly, on the output shaft 10 of screw instrument 1 and on the main shaft 701 of screw supporting device 2, intermeshing travelling gear 717 is provided with.Output shaft 10 and main shaft 701 are by the transmission carrying out power of intermeshing travelling gear 717.Travelling gear 717 radial direction is arranged, and therefore has longitudinal clutch distance H6, and after travelling gear 717 relative movement exceedes clutch distance H6, travelling gear 717 just departs from engagement makes output shaft 10 be connected with regard to being disconnected power with main shaft 701.The effect of fixture block 65 is exactly promote output shaft 10 relative main 701 to produce longitudinal relative movement, thus interrupts power connection.

Its depthkeeping process is described below: as shown in figure 15, after screw 100 hammers into workpiece, feet 907 first abuts surface of the work 103.Now depthkeeping bar 50 still has a segment distance to surface of the work 103.When screw 100 continue to be screwed into until preset the degree of depth after, depthkeeping bar 50 is supported by surface of the work 103 and produces small vertically moving.Depthkeeping bar 50 correspondingly promotes that the first regulating block 57 is corresponding to be vertically moved.And being threaded due to the first regulating block 57 and the second regulating block 58, make the first regulating block 57 drive the second regulating block 58 to vertically move.In moving process, the fixture block 65 on the second regulating block 58 promotes that output shaft 10 is corresponding to be vertically moved.And after output shaft 10 produces and vertically move, output shaft 10 just departs from power with main shaft 701 and is connected.The screw 100 be positioned on main shaft 701 runs out of steam and just can stop very soon.And when user regulates predetermined depth as required, only need to rotate the operation ring 59 exposed.Operation ring 59 drives the corresponding rotation of the first regulating block 57, thus makes the first regulating block 57 drive depthkeeping bar 50 generation to vertically move, thus regulates the depthkeeping degree of depth of depthkeeping bar 50.Certainly, depthkeeping unit 20 is not limited to be applied in this embodiment, and other embodiments also can adopt this depthkeeping unit 20.

It should be noted that, after screw 100 fit on screwdriver bit 703, degree of depth indicating member 54 on depthkeeping bar 50 keeps concordant with the end in screw 100 nut portion 101, and degree of depth indicating member 54 contacts the contact surface of surface of the work 103 longitudinal axial distance H 5 to depthkeeping bar 50 is greater than the clutch distance H6 of travelling gear 717, as shown in figure 15.After the degree of depth that such arrival is predetermined, travelling gear 717 first reaches clutch distance and departs from, and guarantees that power connects and disconnects smoothly.Simultaneously under the instruction of degree of depth indicating member 54, the nut portion 101 of screw 100 also can stop after squeezing into the default degree of depth of workpiece.Thus improve the accuracy of whole depthkeeping unit 20 depthkeeping.

As shown in Figure 16 to Figure 18, it is the screw instrument 1 of the fourth embodiment of the present invention.In 4th embodiment and the second embodiment, same or analogous place does not just describe in detail, highlights both differences below.

In the present embodiment, the rotating shaft 26 of claw 802 is not provided with torsion spring 28.Feet 907 on actuator 9 is provided with salient point 916.Salient point 916 is positioned at housing 6, and arranges at the radially inner side of feet 907.The effect of salient point 916 makes the second end 22 of abutting claw 802, makes claw 802 to the direction bias voltage not helping screw.Such salient point 916 just can replace the bias effect of torsion spring 28, and biasing effect is better.

In the present embodiment, screw supporting device 2 can conveniently install or remove with screw instrument 1.As shown in figure 17, screw instrument 1 is provided with the first fixing locating ring 66.First locating ring 66 can be arranged on the shell 3 of screw instrument 1, also can be arranged on inner reduction box casing, can also be arranged on other fixtures.This first locating ring 66 is arranged around axis X, and the center of the first locating ring 66 and axes X coincide.First locating ring 66 is provided with longitudinal positioning step 67.Positioning step 67 is uniformly distributed in the circumference of the first locating ring 66.Screw supporting device 2 is provided with equally the second fixing locating ring 68.Second locating ring 68 can be fixedly connected with the housing 6 of screw supporting device 2, also can be fixedly connected with other fixtures.Second locating ring 68 is provided with longitudinal locating convex block 69.Locating convex block 69 clamping enters in positioning step 67, thus screw supporting device 2 is fixedly connected with screw instrument 1.Certain locating convex block 69 can be connected in the diverse location of positioning step 67, makes screw supporting device 2 be positioned at the diverse location of screw instrument 1 along axis X.Certainly, screw supporting device 2 has also had the lock cell 70 of locking action.When after lock cell 70 lock screw supporting device 2, screw supporting device 2 is just fixedly connected with screw instrument 1.After lock cell 70 unlocks, the diverse location of user and the relative screw instrument 1 of adjustable screw supporting device 2.

As shown in Figure 16 to Figure 18, lock cell 70 mainly comprises locking ball 71 and locking ring 72.The sleeve 702 of socket main shaft 701 is provided with the radial lock slots 73 arranged.Namely locking ball 71 is positioned at this lock slots 73.The output shaft 10 of lock slots 73 radially inner side one end is provided with locking hole 74.Locking ball 71 can roll in this locking hole 74 and output shaft 10 and screw supporting device 2 are fixed, thus plays locking action.Locking ring 72 is positioned at the radial outside of lock slots 73.The medial surface of locking ring 72 radially can promote locking ball 71 and enter locking hole 74 and lock.In addition, unblock hole 75 is also provided with at the medial surface of locking ring 72.Unblock hole 75 can hold locking ball 71 and enter.When making unblock cheat 75 aligning lock slots 73 around axis X rotation lock fixed ring 72, the locking ball 71 in lock slots 73 just can enter and unlock hole 75 in locking hole 74.Just relieve locking action between screw supporting device 2 and screw instrument 1, thus screw supporting device 2 is separated with screw instrument 1.User just can rotate around axis X screw supporting device 2 according to demand relative to screw instrument 1.Make locating convex block 69 clamping enter positioning step 67 after arriving desirable position, then rotation lock fixed ring 72 pushes locking ball 71 in locking hole 74 and realizes locking.In a preferred embodiment, for the ease of rotation lock fixed ring 72, the housing 6 of screw supporting device 2 is provided with opening and simultaneously locking ring 72 is provided with protruding spanner 76.User promotes spanner 76 just can make locking ring 72 rotate.

As Figure 19 to Figure 32 is depicted as the screw supporting device 1 of fifth embodiment of the invention.This kind of screw supporting device 1 can with screw instrument 2 with the use of.Be screwed in the process of workpiece at screw instrument 2 by screw 100, screw supporting device 1 helps screw 100, makes the axis of screw 100 parallel with the normal direction of surface of the work 103 all the time.Namely allow screw 100 vertical with surface of the work 103 all the time, screw 100 is being screwed in process to tilt, thus screw 100 can be screwed into workpiece by operator easily, like a cork.Screw instrument 2 can be hand-operated tools also can be electric tool.In the present embodiment, screw instrument 2 is electric screwdriver.Electric screwdriver is the common instruments of those skilled in that art, and it has shell 3 and working head 80.Shell 3 is provided with handle 4 and starting switch 5.Handle 4 provides operator to grip.Starting switch 5 starts the motor (not shown) be located in shell 3 for electricity.As shown in Figure 19 to Figure 21, working head 80 comprises and connects motor and the output shaft 10 that can rotate around output shaft axis X and the screwdriver bit 703 being connected output shaft 10, and screwdriver bit 703 rotates around output shaft axis X equally.The top of screwdriver bit 703 directly contacts with screw 100.The top of screwdriver bit 703 has decorative pattern with attachment screw.In various embodiments, decorative pattern can be protruding yi word pattern or cross etc.During normal work, motor produces power, and drives screwdriver bit 703 to rotate through transmission device (not shown), thus screw 100 is screwed into workpiece.In the present embodiment, screw instrument 1 is when processing screw 100, and output shaft axis X is with the dead in line of screw 100.

Screw 100 comprises nut portion 101 and threaded portion 102.Nut portion 101 is positioned at one end of screw 100, and it is structure roughly coning.The bottom surface in nut portion 101 has the engagement decorative pattern of depression.These engagement decorative patterns just in time close with the decorative pattern matching form of screwdriver bit 703.Screw 100 and screwdriver bit 703 are engaged closely, and screwdriver bit 703 rotates and screw 100 also can be driven correspondingly to rotate.Threaded portion 102 roughly becomes slim cylindrical construction, and its side surface is provided with screw thread.When whole screw 100 rotates with screwdriver bit 403, the screw thread of rotation and absorption surface thus make screw 100 pierce workpiece.

Screw supporting device 2 is arranged near working head 80.Screw supporting device 2 has housing 6.In the present embodiment, housing 6 is made up of two symmetrical half shells.Housing 6 roughly extends along axis X.Housing 6 is provided with the openend 603 passed for screwdriver bit 703.Axis X is too through this openend 603.Housing 6 is fixedly connected with working head 80, and fixing mode can be that bolt such as to fix at the common mode.

Screw supporting device 2 comprises at least one for helping the support unit 81 of screw 100.As shown in Figure 19 to Figure 22, help being exposed to outside housing 6 of unit 81 part.In order to more firmly help the screw 11 be positioned in axis X, unit 81 is helped to be evenly arranged around axis X circumference.In the present embodiment, the quantity of helping unit 81 is 2, helps unit about the setting of axis X symmetry for these 2.In other embodiments, helping the quantity of unit 81 to be not limited to 2, can be more than 3 or 3.In addition, unit 81 is helped to comprise the support portion 82 helping screw 100.Support portion 82 is positioned at outside housing 6, and contacts with screw 100.In the present embodiment, support portion 82 can contact with threaded portion 102 side surface of screw 100.Therefore, help unit 81 to have at least two positions, under a position, help the support portion 82 of unit 81 to help screw 100, as shown in figure 22; Under another position, the support portion 82 of unit 81 is helped to unclamp screw 100, as shown in figure 27.Screw supporting device 1 also comprises carrier unit 83.Carrier unit 83 is similar with support unit 81, being exposed to outside housing 6 of same part.Carrier unit 83 can move relative to housing 6 axial reciprocating.As shown in Figure 22 and Figure 23, carrier unit 83 includes the support member 831 be positioned at outside housing 6 and the support platform 832 being positioned at housing 6.The plane orthogonal that support platform 832 is formed in axis X, and connects support member 831.Support member 831 and support platform 832 can be integrally formed.Support platform 832 has the first perforation 833 through axis X.Support platform 832 is provided with axially extended guide ribs 834.In the present embodiment, the quantity of guide ribs 834 is 4.The quantity of certain guide ribs 834 can also be multiple.Support member 831 is configured to corresponding with helping unit 81, namely keeps and the setting helping the same quantity of unit 81, and is uniformly distributed in the circumferential.The benefit of such design makes support unit 81 and support member 831 mutually corresponding one by one.In the present embodiment, support member 831 is 2, and it is symmetrical about axis X.Support member 831 roughly axially extends.Compared to support unit 81, support member 831 is positioned at outer circumferential, and helps unit 81 to be positioned at week to the inside, and namely support member 831 is greater than the ultimate range of helping unit 81 to axis X to the ultimate range of axis X.In addition, the length that support member 831 is in axial direction gone up also is greater than the length of helping unit 81 in axial direction to go up.Therefore as shown in Figure 21 to Figure 23, the support member 831 that circumference is arranged and support platform 832 form spatial accommodation 830, help unit 81 to be positioned at this spatial accommodation 830.Support member 831 comprises feet 907.In the present embodiment, each support member 831 includes two feets 907.Connect with connector 835 between these two feets 907.Feet 907 on carrier unit 83 also has and guides step 836, guide step 836 axially to extend.Feet 907 is obliquely installed to week to the inside in the end of support member 931.Certain feet 907 can also with other forms of setting.The effect of feet 907 abuts to surface of the work.Can apply certain pressure to workpiece when screw tool 1 screws screw 100, feet 907 abuts to after on surface of the work 13, and workpiece can be supplied to the active force of support member 907 along axis X, thus acts on a kind of power source driving arm unit 83 and move axially.

In addition, housing 6 is outer is also provided with reset switch 84.As shown in Figure 19 to Figure 23, reset switch 84 connection bracket unit 83.The reason arranging reset switch 84 is the existence making its alternatively power source.When feet 907 is not with absorption surface, operator can operate reset switch 84 easily, makes reset switch 84 drive carrier unit 83 to move axially.In the present embodiment, reset switch 84 is located on the outer surface of housing 6.Reset switch 84 is provided with installing hole 85.The support platform 832 of carrier unit 83 is provided with corresponding installing hole 86 equally.Installing hole 85 and installing hole 86 corresponding matching, utilize retaining element reset switch 84 to be fixedly connected with carrier unit 83 with installing hole 86 by installing hole 85.Housing 6 is also provided with chute 87.Chute 87 axially extends, and reset switch 84 is mobile in chute 87.In addition, in chute 87, be also provided with position stop piece 88, prevent reset switch 84 from skidding off chute 87.Certainly, except reset switch 84, can also cam spanner be set, utilizes cam spanner to drive carrier unit 83 to reset.

As shown in Figure 19 to Figure 26, screw supporting device 2 is also provided with rotating ring 29.Rotating ring 29 is fixedly connected with housing 6.As shown in figure 26, rotating ring 29 is fixedly connected with by setting tools such as screws with housing 6.Meanwhile, what adaptor ring 35 was fixing is connected to screw instrument 2.Adaptor ring 35 and rotating ring 29 connect around axis X is rotating.After screw supporting device 2 is assemblied in screw instrument 1, rotate rotating ring 29 relative to adaptor ring 35, because rotating ring 29 can move together with housing 6, make screw supporting device 1 around axis X relative screw instrument 2 rotational angle.Rotating ring 29 has connection boss 30 and connects with housing 6.Connect on a side end face of the axial projection of boss 30 and rotating ring 29, connect with the groove in the guide platform 903 on the guidance unit 90 in housing 6.The opposite side of rotating ring 29 is provided with rotation slot, for accommodating the second lug 38 on adaptor ring 35.Second lug 38 can rotate around axis X in rotation slot.And the connection boss 30 on rotating ring 29 is also radial is protruding with the first stop surface 31 for limiting the slewing area of the second lug 38.Rotating ring 29 is gone back radial direction and is provided with limit element 89 simultaneously.Limit element 89 can be common screw.The angled setting in the circumferential of first stop surface 31 and limit element 89.Second lug 38 is limited at the interior rotation of angular range of the first stop surface 31 and limit element 89 restriction.As shown in figure 26, when rotating ring 29 is after axis X turns clockwise, the first stop surface 31 produces backstop to the second lug 38.When rotating ring 29 is after axis X is rotated counterclockwise, limit element 89 produces backstop to the second lug 38.In the present embodiment, the predetermined angle of setting is 90 degree.As shown in figure 20, after rotating rotating ring 29, screw supporting device 2 relatively screw instrument 1 have rotated 90 degree around axis X.Facilitate screw supporting device 2 to help screw 100 under different occasions, such as, in corner or skewed slot from the benefit of like this design.Which thereby enhance the operability of screw supporting device 2.

Please refer to Figure 21 to Figure 25, screw supporting device 1 also comprises sleeve 702, guidance unit 90, bearing pin 91 etc.Sleeve 702 is positioned at housing 6.Sleeve 702 Axis Extension, its one end is socketed on the output shaft 10 of screw instrument 1, makes sleeve 702 can the corresponding rotation with the rotation of output shaft 10.And sleeve 702 and the socket of output shaft 10 non-tight fit, sleeve 702 can move axially relative to output shaft 102, but sleeve 702 and output shaft 10 can together with rotate around axis X.The other end of sleeve 702 then overlaps the screwdriver bit 703 receiving screw instrument 1, and sleeve 702 and screwdriver bit 703 are tight fit socket, and sleeve 702 relatively screwdriver bit 703 cannot move axially, but sleeve 702 and screwdriver bit 703 can together with rotate around axis X.In the present embodiment, that end radius that sleeve 702 is socketed output shaft 10 is slightly less than the radius of output shaft 10, and sleeve 702 connects the radius of that end radius slightly larger than screwdriver bit 703 of screwdriver bit 703.It is the space of hollow near housing 6 inner sleeve 702.Sleeve 702 is subject to external force and promotes to move axially.But be restricted effect in the axial direction, make sleeve 702 can only move certain distance in the axial direction.As shown in Figure 22 and Figure 27, that end that sleeve 702 connects screwdriver bit 703 is subject to the restriction of the step surface 92 of housing 6.Meanwhile, that end that sleeve 702 connects output shaft 10 is then subject to the backstop of the chimb 93 of output shaft 10.In addition, sleeve 702 has the cambered outwards convex shoulder 713 in footpath.In the present embodiment, convex shoulder 713 is arranged at one end that sleeve 702 connects screwdriver bit 703.The Main Function arranging convex shoulder 713 facilitates sleeve 702 axially to contact with support unit 81.In a preferred embodiment, convex shoulder 713 helps the surface of unit 81 to be provided with groove 716 towards contact.Groove 716 has loop configuration, and can hold steel ball 715 in groove 716, thus steel ball 715 is limited in groove 716 mobile.The central openings of pad 714 to be socketed on sleeve 702, and is positioned on steel ball 715.The convex shoulder 713 of such sleeve 702 is contacted with support unit 81 with pad 714 by steel ball 715.The frictional force between unit 81 and sleeve 702 is helped to be force of rolling friction.As shown in figure 23, sleeve 702 is through the first perforation 833 of support platform 832.The elastic component 12 be socketed on sleeve 702 is also provided with between support platform 832 and output shaft 10.One end of elastic component 12 abuts on the shaft shoulder 94 on output shaft 10, and the other end then abuts in the support platform 832 of carrier unit 83.When distance between support platform 832 and the shaft shoulder 94 of output shaft 10 changes, elastic component 12 produces partial pressure in support platform 832, the trend of the shaft shoulder 94 making it be kept away from output shaft 10.Because output shaft 10 can not move axially, therefore partial pressure is in support platform 832, produce and promote support platform 832 becomes active force from large direction movement to distance, when elastic component 12 produce biasing force be enough to overcome the external force that support platform 832 bears time, support platform 832 moves towards the direction away from output shaft 10.

As shown in Figure 22 to Figure 25, guidance unit 90 is arranged in housing 6 regularly.Guidance unit 90 is linked together by some common retaining elements with the inwall of housing 6.Retaining element is screw, hasp etc. such as.The effect of guidance unit 90 is guide support unit 83, makes it move according to predetermined direction.In the present embodiment, guidance unit 90 comprises multiple lead foot 95 and the guide platform 96 being connected lead foot 95.Lead foot 95 and guide platform 96 can be integrally formed.Lead foot 95 axially extends, and each lead foot 95 matches one by one with the feet 907 on carrier unit 83 respectively, and namely each feet 907 has a lead foot 95 corresponding with it.In the present embodiment, the quantity of lead foot 95 is 4, and circumference is uniformly distributed.Each lead foot 95 is connected on the guiding step 836 of feet 907 respectively, and guides step 836 and lead foot 95 to produce relative movement along in axis X.When carrier unit 83 is subject to external power source driving, (such as operator's manual operation reset switch moves, or the feet 907 on carrier unit 83 abuts to the thrust that surface of the work is subject to workpiece), namely carrier unit 83 produces along the guiding of guidance unit 90 and moves axially.Multiple lead foot 95 couples together by guide platform 96, becomes one.The central authorities of guide platform 96 have the second perforation 97 through axis X, and sleeve 702 can through this second perforation 97.Meanwhile, guide platform 96 also has bullport 98.The guide ribs 834 that bullport 98 can hold on carrier unit 83 is passed.Bullport 98 and guide ribs 834 one_to_one corresponding.The guiding position-limiting action of so further raising guidance unit 90 pairs of carrier units 83.Therefore the coordinating of bullport 98 and guide ribs 834, and lead foot 95 and guide the cooperation of step 836 to constitute guide.Certainly, in other embodiments, the second perforation 97 can with bullport 98 Integration Design, form a larger hole.In addition, guide is also not limited thereto, and chute, track also can as guides.

As shown in Figure 21 to Figure 25, bearing pin 91 is arranged in housing 6.The axis C of bearing pin 91 is mutually vertical with the axis X of screw supporting device 2.Bearing pin 91 is also socketed with torsion spring 99, and the effect of torsion spring 99 is to provide biasing force.Certainly, the present invention is not limited to torsion spring 99, and all can provide the elastic component of biasing force to be all fine.Torsion spring 99 has two pins, and one abuts on carrier unit 83, and another then abuts to helps on unit 81.In the present embodiment, as shown in figure 25, the support member 831 of carrier unit 83 has protruding abutting block 837, and a pin of torsion spring 99 abuts to and abuts on block 837.Help on unit 81 and have abutting step 838, another pin of torsion spring 99 abuts to and abuts on step 838.Torsion spring 99 provides biasing force between carrier unit 83 and support unit 81.

Help on unit 81 and also have pin shaft hole 811, pin shaft hole 811 can hold bearing pin 91 and pass.Help unit 81 can rotate around this bearing pin 91.Help unit 81 to have the end that two lay respectively at bearing pin 91 both sides, first end 21 is positioned at housing 6, and 22, the second end on the other side is positioned at outside housing 6.Namely support portion 812 is positioned on this second end 22.When one end is subject to the promotion of external force, help unit 81 will rotate around bearing pin 91, thus the position of one end change in addition.First end 21 is arranged near sleeve 702.First end 21 can and sleeve 702 between there is certain gap d.When sleeve 702 moves axially, the gap d between first end 21 and sleeve 702 will reduce and even eliminate.After gap d is eliminated, sleeve 702 just and first end 21 abut against.The abutting of sleeve 702 and first end 21 will make sleeve 702 be supplied to first end 12 motive force, thus makes to help unit 81 to produce rotation around bearing pin 91.Therefore, sleeve 702 is just equivalent to the effect of actuator.Sleeve 702 produces mobile going when being subject to external force when screw (such as working head abut to its thrust) and promotes to help unit 81 to move.Certainly, actuator of the present invention is not limited to the form of sleeve, and actuator can also be the element that guide rod or cam bit etc. can play driving effect.The first end 21 of unit 81 is helped to have the contact point 813 of two lordosis.The contact that contact point 813 and sleeve 702 produce is point cantact.The advantage of such design mainly helps unit 81 when bearing pin 91 rotates, and the arm of force that first end 21 produces is larger, thus larger at the active force of the second end 22 generation.Certainly, the structure of first end 32 is not limited to this, and the structure of any contact can carried out with sleeve is all fine.The benefit that screw helps unit to design like this, during due to screw 100 is screwed into workpiece, screw 100 must be needed to abut the working head 80 of screw instrument 1.Therefore this abutting power is utilized to make screw supporting device 2 can automatically clamp screw 100.

As shown in Figure 21 to Figure 25, help the moving block 815 that the second end 22 of unit 81 has a rotating shaft 814 and can rotate around this rotating shaft 814.Second end 22 is also provided with retaining wall 816, and retaining wall 816 can stop that moving block 815 rotates, thus the angle of being rotated by moving block 815 restriction within the specific limits.The advantage arranging moving block 815 is, because moving block 815 can rotate certain angle, distance between the moving block 815 of support unit 81 and axis X is changed, thus the support unit 81 achieving screw supporting device 2 can help the effect of the screw 100 of different size size, improves the applicability of screw supporting device 2.As shown in Figure 22 to Figure 25, the end of moving block 815 is also provided with the support face 23 contacted with screw 100.Support face 23 is design in arc surface type, and such benefit makes support face 23 can have comparatively large contact surface with threaded portion 102 side surface of screw 100 to amass, and keeps fully abutting screw 100.In preferably embodiment, support face 23 has the decorative pattern matched with screw 100 screw thread, abut more closely to keep support face 23 and screw 100.And help the second end 22 of unit 81 to help the direction of screw 100 perpendicular to axis X.

When the position helping the second end 22 of unit 81 to turn to clamp screws 100, the biasing force that torsion spring 99 on bearing pin 91 provides will help unit 81 to screw 100 bias voltage, thus the support unit 81 made not only can make screw 100 be supported, but also the chucking power that screw 100 can be given certain, make screw 100 keep by the state clamped, screw 100 is not easily got loose in the process being screwed into workpiece.Be screwed in the process of workpiece at screw 100, as shown in figure 29, the feet 907 of carrier unit 83 can abut to surface of the work 103, thus makes carrier unit 83 be subject to the thrust of workpiece and move along axis X.And screw supporting device 2 also has actuated element, by actuated element, carrier unit 83 can drive helps unit 81 to move relative to housing 6 with carrier unit 83.In the present embodiment, this actuated element is bearing pin 91.As shown in Figure 23 to Figure 25, carrier unit 83 has a groove 817.Bearing pin 91 can pass this groove 817 and pin shaft hole 811, thus support unit 81 and carrier unit 83 is coupled together.Certainly, the present invention is not limited thereto, carrier unit 83 can also be connected by other helps unit 81, such as gear connection, connecting rod connection etc.

In addition, screw supporting device 2 also has position-limit mechanism.Position-limit mechanism is arranged at carrier unit 83 and helps between unit 81.By this position-limit mechanism, carrier unit 83 can optionally drive helps unit 81 to move relative to housing 6.The mode selected can be diversified, such as, both can machine driving select, also can electronic telecontrol selection etc.In the present embodiment, carrier unit 83 and position-limit mechanism have the first state and the second state two states.When in the second state, carrier unit 83 can move, and helps unit 81 limited mechanism restriction and cannot move with carrier unit 83.When in the first state, carrier unit 83 still can move, and helps unit 81 to be relieved restriction, can move with carrier unit 83.In the present embodiment, position-limit mechanism includes the groove 817 be positioned on carrier unit 83 and the guide groove 818 be positioned on guidance unit 90.

As shown in figure 23 and figure 24, the groove 817 on carrier unit 83 is positioned on support member 831, support member 831 extends lug 819.Groove 817 is formed between lug 819 and support member 831.Groove 817 can hold bearing pin 91 and pass.In the present embodiment, the bearing of trend of groove 817 is obliquely installed relative to the axis X of screw supporting device 2, and its slanted angle is between 0 degree to 90 degree.Make this groove 817 axially have certain projected length, and diametrically there is certain projected length equally.Certainly, the present invention is not limited to the straight line setting that groove 817 is configured to tilt, and groove 817 also can be configured to the curved groove bent.As long as groove 817 has projected length just within protection scope of the present invention in axis and radial direction simultaneously.In the present embodiment, groove 817 is semienclosed slot.One end of groove 817 is blind end 820, and the other end of groove 817 is open end 821.Blind end 820 is compared to open end 821, and distance support member 831 is nearer.Then distance axis X is nearer in open end 821.In other words, blind end 820 is radial near outside, and open end 821 is radial near inner side.Certain groove 817 also can be configured to enclosed slot, and namely two ends are blind end.Carrier unit 4 has multiple support member 831, and each support member 831 also has groove 817.Groove 817 on support member 831 also distributes in the circumferential symmetrically and evenly.

Guide groove 818 on guidance unit 90 is positioned on lead foot 95.In the present embodiment, guide groove 818 is configured to laterally arrange, and namely the bearing of trend of guide groove 818 is perpendicular to the axis X of screw supporting device 2.Guide groove 818 can hold bearing pin 91 equally and pass.When bearing pin 91 is positioned at guide groove 818, lead foot 95 pairs of bearing pin 91 limited locations effect of guide groove 818 both sides, stops it to move axially.Guide groove 818 is also semienclosed slot.One end of guide groove 818 is blind end 822, and the other end is open end 823.Bearing pin 91 moves to open end 823 in guide groove 818, can depart from guide groove 818.Blind end 822 is compared to open end 823, and distance axis X is nearer.In other words in the circumferential, blind end 822 is near inner side, and open end 823 is near outside.This is just in time contrary with groove 817 condition.In addition, guidance unit 90 has multiple lead foot 95, and each lead foot 95 also has guide groove 818.Guide groove 818 on lead foot 95 distributes in the circumferential symmetrically and evenly.

As shown in Figure 22 to Figure 25, the overlap of guide groove 818 and groove 817 part, makes bearing pin 91 can pass guide groove 818 and groove 817 simultaneously.The position-limit mechanism that should be made up of guide groove 818 and groove 817 is achieved like this: bearing pin 91 simultaneously through guide groove 818 and groove 817, and is arranged in blind end 822 and the groove 817 of guide groove 818 simultaneously.Carrier unit 83 is subject to external force driving and generation moves axially.But because bearing pin 91 is positioned at the blind end 822 of guide groove 818, be subject to axial spacing.Thus bearing pin 91 and help unit 81 cannot produce along with carrier unit 83 to move axially.Now carrier unit 83 is just in the second state.After carrier unit 83 moves, the lug 819 on carrier unit 83 and support member 831 drive bearing pin 91 to move from the open end 821 of groove 817 to blind end 820, namely circumference move laterally.Simultaneously for guidance unit 90, bearing pin 91 also moves from the blind end 822 of guide groove 818 to open end 823.When bearing pin 91 finally moves to the open end 823 of guide groove 818 and departs from guide groove 818, bearing pin 91 has just departed from the spacing of axis.Now bearing pin 91 can be positioned at the blind end 820 of groove 817, also can not be positioned at blind end 820, but bearing pin 91 is arranged in groove 817 all the time.Thus bearing pin 91 and help unit 81 to move axially along with carrier unit 83.Now carrier unit 83 is in the first state.

Under normal operating conditions, sleeve 702 is subject to the thrust that screw 100 abuts screwdriver bit 703, causes sleeve 702 to move axially to make the state of helping unit 81 to keep helping screw 100, and help unit 81 with carrier unit 83 move axially and mobile.But help unit 81 not can remain the state of helping screw 100.When helping unit 81 to move to predeterminated position, help unit 81 to stop mobile, support unit 81 unclamps the support to screw 100.As shown in Figure 22 and Figure 23, housing 6 also comprises stop part 608.Help unit 81 relatively described housing 6 pivotable and there is stopper section 824, when helping the relative housing 6 of unit 81 to move axially to predeterminated position, stopper section 824 abuts with stop part 608, thus helps unit 81 to unclamp from helping the position of screw 100 to turn to the position helping screw 100.

Between the pin shaft hole 811 that stopper section 824 is roughly arranged at support unit 81 and the second end 22.Help unit 81 to have arch portion, arch portion has the first contact surface 825 of evagination and the second contact surface 826 of indent.Arch portion is greatly between pin shaft hole 811 and the second end 22.First contact surface 825 and the second contact surface 826 are arc surface.In the present embodiment, stopper section 824 is the first contact surface 825.The stop part 608 of screw supporting device 2 is the stop surface 609 on the outer surface of housing 6, and can abut against with the first contact surface 825.The surface of stop surface 609 also can be curved surface, and with the first contact surface 825 form fit.After stopper section 824 and stop part 608 abut, owing to being subject to barrier effect, help unit 81 to rotate round about around bearing pin 91, make to help the second end 22 of unit 81 to overcome the biasing force of torsion spring 99 and the clamping of unclamping screw 100.Therefore, backstop can be run in moving process owing to helping unit 81, and under the effect of backstop power, help unit 81 will unclamp from helping the position of screw 100 to be switched to the position helping screw 100 automatically, and do not need manpower to go to control to help unit 81 to unclamp clamp screws 100.As shown in figure 22, screw supporting device 1 also comprises keeper 827.Keeper 827 can contact with helping the stopper section 824 of unit 81 and keep helping unit 81 to unclamp the position helping screw 100.In the present embodiment, keeper 827 is for being positioned at the magnet on carrier unit 83.The support member 831 of carrier unit 83 has holding tank 828, and magnet is arranged in holding tank 828.In a preferred embodiment, abut block 837 and just form holding tank 828 around.And help the material of unit 81 to be metal, it can be attracted by the magnetic force.The second contact surface 826 of the arch portion of unit 81 is helped just in time to aim at magnet.After the second contact surface 826 contacts with magnet, the biasing force absorption that magnet overcomes torsion spring 99 is helped unit 81 thus keeps helping unit 81 to be in the position of unclamping and helping screw 100.

The course of work of lower whole screw supporting device is described below in detail: during original state, the stopper section 824 of unit 81 is helped to be adsorbed by the keeper 827 on carrier unit 83, absorption affinity due to keeper 827 is the biasing force slightly larger than the torsion spring 99 on bearing pin 91, described support unit 81 is in the position of unclamping and helping screw 100, has radial spacing D0 between support face 23 and axis X.Now, the pad 714 on the convex shoulder 713 of sleeve 702 and help between the first end 21 of unit 81 there is axial distance d.The chimb 93 of sleeve 702 and output shaft 10 has axial spacing H0, it is to be noted that spacing H0 is greater than distance d.Under carrier unit 83 is also in the second state, namely bearing pin 91 is arranged in groove 817 and guide groove 818 simultaneously, as shown in figure 27.

Then, screw 100 abuts with screwdriver bit 703 by operator, and applies certain external force by screw 100 to screwdriver bit 703.Because screwdriver bit 703 is connected with sleeve 702 axial restraint in housing 6, make screwdriver bit 703 promote sleeve 702 and move axially to output shaft 10, thus axial spacing H0 diminishes.In addition, the gap d between the first end 21 of unit 81 and sleeve 702 is helped also to reduce.Until sleeve 702 moves axially to after abutting with first end 21, namely distance d disappears.Now, sleeve 702 just provides the thrust of first end 21 axis, make to help unit 81 to rotate around bearing pin 91, due to thrust and torsion spring biasing force to make a concerted effort be the absorption affinity slightly larger than keeper 827, therefore rotate clockwise around bearing pin 91 under helping unit 81 to be applied to the effect of the power of first end 21 at sleeve 702, the second end 32 is made to turn to screw 100, support face 23 diminishes with the radial spacing D0 of axis X, final support face 23 and the radial spacing D0 of axis X equal the radius of screw 100 threaded portion 102, namely now help unit 81 to be in the position helping screw 100.Now, under carrier unit 83 is still in the second state, namely bearing pin 91 is arranged in groove 817 and guide groove 818 simultaneously, as shown in figure 28.After helping unit 81 to be in the position helping screw 100, because torsion spring 99 provides towards the biasing force of screw 100 all the time to support unit 81, make to help unit 81 to keep helping the state of screw 100.Then, operator starts to operate screw instrument 1 and drives screw 100 to be screwed into surface of the work 103.Now the feet 907 of carrier unit 83 has spacing with surface of the work 103.

After screw 100 is screwed into surface of the work 103 1 segment distance, the feet 907 of carrier unit 83 starts to abut surface of the work 103, and spacing is reduced to 0.Surface of the work 13 provides thrust to carrier unit 83, and carrier unit 83 is moved axially.Carrier unit 83 just drives bearing pin 91 to move to the blind end 820 of groove 817, under but now carrier unit 83 is still in the second state, namely bearing pin 91 is arranged in groove 817 and guide groove 818 simultaneously, helps unit 81 to move axially, does not move axially with carrier unit 83.What axial spacing H0 continued diminishes, and help unit 81 to be still in the position helping screw 100, support face 23 is D0 with the distance of axis X, as shown in figure 29.

After carrier unit 83 continues mobile a bit of distance with the continuing to be screwed into surface of the work 103 of screw 100, now bearing pin 91 is in blind end 820 moving process of groove 817, and bearing pin 91 have left guide groove 818.Now, carrier unit 83 is just moved to the first state from the second state, and bearing pin 91 is arranged in groove 817 and not at guide groove 818.Help unit 81 just can move axially with carrier unit 83.Help between the first end 21 of unit 81 and sleeve 702 and produce gap d.Screw 100 also gradually be screwed into surface of the work 103, what axial spacing H0 continued diminishes, and there is gap d between sleeve 6 and support unit 81 simultaneously, and namely sleeve 6 is given and helped unit 81 to apply external force, but under the effect of torsion spring 81, help unit 81 still to keep the state of helping.Support face 361 is D0 with the distance of axis X, as shown in figure 30.

When helping unit 81 to move to precalculated position to the direction away from surface of the work 103, the stopper section 824 of unit 81 is helped to be subject to the backstop of the stop surface 609 of housing 6 and to rotate counterclockwise around bearing pin 91, because backstop power is much larger than the biasing force of torsion spring 99, the second end 22 of unit 81 is therefore helped to unclamp from helping the position of screw 100 to move to the position helping screw 100 rapidly.Axial spacing H0 is still diminishing, and support face 23 becomes again original D0 to the radial spacing of axis X, helps the second contact surface 826 of unit 81 to be adsorbed by keeper 827 and remains on the state of unclamping and helping screw 100, as shown in figure 31.

Then continue to drive screw instrument 1 that screw 100 entirety is screwed into workpiece.The fastening work that is screwed into of screw 100 completes.Now, carrier unit 83 is still fitted with surface of the work 103, help unit 81 and carrier unit 83 still together with move.The first end 21 of unit 81 is helped to reach maximum to the gap d of axle sleeve 702.The support face 23 of the second end 22 of unit 81 is helped still to be D0 with the radial spacing of axis X, as shown in figure 32.

Screw supporting device 2 lifts from surface of the work 103 by operator, carrier unit 83 is departed from and the abutting of workpiece, and under the effect of the elastic component 12 in housing 6, carrier unit 83 moves along axis to the direction away from output shaft 10, forced back towards initial position, as shown in the figure.Next the work of new round trip bolt 100 can be repeated.

And in operation, particularly run into and want hang up or the situation needing to reset that is stuck, operator need not make carrier unit 83 abut with workpiece to make it move axially, can start reset switch 84, reset switch 84 is moved axially along the chute 87 on housing 6.Because reset switch 84 is fixedly connected with carrier unit 83, so carrier unit 83 can move like a cork, correspondingly, carrier unit 83 also can drive and help unit 81 to move axially.Thus make support unit 81 and carrier unit 83 be returned to initial position from position at that time, be conducive to the carrying out next time worked, and rapid operation.

The present invention is not limited to lifted specific embodiment structure, and the structure based on the present invention's design all belongs to scope.

Claims (8)

1. a screw supporting device, screw is helped for additional screws instrument, described screw instrument has output shaft axis, described screw supporting device comprises housing, be positioned at described housing at least partly outer for helping the support part of screw, it is characterized in that: there is in described housing the receiving space of accommodating described support part, described support part is selectively in receiving space to make described support part cannot help described screw, described support part has and exposes described receiving space and operationally help the primary importance of described screw and be in receiving space to make described support part cannot help the second place of described screw, described support part is operationally along moving axially between described primary importance and the second place, described screw supporting device also comprises the actuator driving the movement of described support part and the gauge tap operatively locking or unlock described actuator.

2. screw supporting device according to claim 1, is characterized in that: when primary importance, described support part helps described screw rotationally.

3. screw supporting device according to claim 1, it is characterized in that: described screw supporting device also comprises the bias piece of actuator described in bias voltage, after described gauge tap unlocks described actuator, described bias piece promotes described actuator makes described support part move to primary importance.

4. screw supporting device according to claim 3, is characterized in that: described gauge tap comprises the stop part of actuator described in backstop, and described in the bias voltage axial stop that described stop part overcomes described bias piece, actuator is in the second place.

5. screw supporting device according to claim 4, it is characterized in that: described stop part has the lozenges tilted to axial abutted with actuator, described actuator axially promotes described lozenges, thus stop part turns to the position of actuator described in backstop.

6. screw supporting device according to claim 4, is characterized in that: described gauge tap also comprises operating parts, and described operating parts operationally drives the rotation of described stop part that described gauge tap is unlocked.

7. screw supporting device according to claim 4, is characterized in that: described gauge tap also comprises the torsion spring for stop part described in bias voltage.

8. a screw instrument, for screw is hammered into workpiece, described screw instrument comprises shell, be positioned at the motor of described shell, connecting motor also has the output shaft of output shaft axis, it is characterized in that: described screw instrument also comprises the screw supporting device according to any one of claim 1-7.