CN2836998Y - A screw drive capable of setting torsion force - Google Patents

Abstract

The utility model discloses a screw drive capable of setting torsion force. A torsion force setting device is arranged in a handle body of the screw drive. The effective working torque force on the assembling part end of a screw drive rod can be adjusted through a torque force adjusting knob of the torque force setting device, thereby, when the screw drive rod on the assembly part of the screw drive rod executes the screw locking operation, a support ring can not clamped a clutch disk when the holding rotating force exerted on the holding handle body by the user exceeds the setting value of the effective working torque force. Therefore, the clutch disk which is not poked can not transfer the torque force for an actuating rod and the ordinary state of a screw is maintained and fixed on a definite locking degree. Thereby, the defects of the prior art is overcome and the problem that breakage is caused by overtorque can not occur.

Description

A kind of bottle opener of setting torsion

Technical field

The utility model relates to a kind of bottle opener, refer in particular to a kind of on the tight latching operation of screw, but normality is kept certain fastening degree, does not have the improper bottle opener that reverses the torsion set that damages.

Background technology

Bottle opener is used for screw is carried out twist operation, is the daily instrument that very generally uses; For a long time, known bottle opener turns the torsion of screw, only hold the commentaries on classics power, there is no the desirable bottle opener of setting that can simple and easy acquisition torsion, and prevent improper twisting resistance to screw or work caused can not expect destruction whereby with what worker's experience was controlled Screwdriver handle; Especially desire to make the hand tools bottle opener to have the ability of torsion setting, must on extremely limited spatial mode body, finish the function of this expection, and on structural design, want to meet the setting of economic benefit and torsion, more must consider the easy easiness of operating, these conditions belong to the difficulty that needs to be resolved hurrily in the design of bottle opener structure all the time.

The utility model content

The technical problems to be solved in the utility model is: provide a kind of bottle opener of setting torsion, to overcome the defective of above-mentioned known technology.

Technical solution of the present utility model is: a kind of bottle opener of setting torsion, be provided with a torsion setting device in its lever body, and this torsion setting device includes: a stationary magazine creel is installed in the described lever body; One support ring be installed in rotationally in the aforementioned fixation tube with described stationary magazine creel rotation integratedly, and its ring body one end face is provided with a plurality of clamping pieces; One operating bar, the one end penetrates described support ring, and be provided with one first threaded portion in this end position that runs through end, more than one promotion face and one second threaded portion form described start rod body, and the other end of described operating bar be provided with one can be for the screwdriver rod assembled portion of screwdriver rod winding; One clutch discs, the clamping piece of the described relatively support ring of one end is formed with a plurality of concave arc grooves, and the intermediate portion offers an assembling trepanning corresponding to the promotion face of aforementioned operating bar, by this assembling trepanning described clutch discs is set on the aforementioned operating bar and cooperates with described promotion face, the clutch discs of rotating can twist operating bar ground and be provided with, and each clamping piece on the described support ring snaps in the concave arc groove of a corresponding position respectively; One flexible member is set on the operating bar by the aforementioned operating bar first threaded portion end, and an end is stressed on the described support ring; One torsion adjusting knob, be located at described stationary magazine creel and lever body exterior, it is held the transfer part and is emerging in described lever body front end, and inside has internal screw-thread screw on operating bar second threaded portion in the middle of it, the front end of described screwdriver rod assembled portion extends torsion adjusting knob outside, and supplies the clutch discs backup with the inner face of torsion adjusting knob; One original torsion adjusting nut, be screwed on described operating bar first threaded portion, and to described flexible member compression setting, described torsion adjusting knob is done at a stopper that draws that is limited by operating bar, produce compressing power to clutch discs with the compression bounce effect of flexible member, the clamping piece that limits support ring withdraws from the concave arc groove of clutch discs.

Aforesaid a kind of bottle opener of setting torsion, wherein, a plurality of clamping pieces that described support ring one end face is installed are for rolling wear-resisting steel ball.

As above-mentioned a kind of bottle opener of setting torsion, wherein, the face of stirring that reclines mutually of described support ring and clutch discs is oppositely arranged and is the ratchet mating surface.

Aforesaid a kind of bottle opener of setting torsion, wherein, the described stressed flexible member of compression on the support ring that is resisted against is the compression spring.

Aforesaid a kind of bottle opener of setting torsion, wherein, described be resisted against the stressed flexible member of compression on the support ring by majority mutually stacked washer type elastic disc constituted.

Aforesaid a kind of bottle opener of setting torsion, wherein, the modulation that the described original torsion adjusting nut that is screwed on operating bar first threaded portion has to the flexible member compression degree, be initial effective torsion, and the end of this operating bar first threaded portion end is installed with a sign ring at member assembling process rotation correction bottle opener; The described lever body outside of this sign ring relatively is provided with one and can has an X-rayed this signs ring and surperficial window with torsion scale and mark, during torsion adjusting knob rotating operation, the formed torsion setting of this operating bar axial displacement changes, can inspect the position that indicates ring by window, direct scale and mark from window known the setting value of torsion or adjusted reference value.

Aforesaid a kind of bottle opener of setting torsion, wherein, the screwdriver rod assembled portion front end of described operating bar manifests torsion adjusting knob outside, on this screwdriver rod assembled portion in conjunction with a changeable torsional direction to set the change over adapter of bottle opener torsion, and by this change over adapter confession screwdriver rod winding, the torsion setting of bottle opener according to this can be switched effective torsional direction of bottle opener by change over adapter.

Aforesaid a kind of bottle opener of setting torsion, wherein, on the screwdriver rod assembled portion of described operating bar in conjunction with a changeable torsional direction to set the change over adapter of bottle opener torsion, this torsional direction change over adapter comprises: one is installed in the joint chair on the screwdriver rod assembled portion, has an axial hole in this joint chair; One direction control piece covers on aforementioned joint chair, has a through hole and an inner surface, and is formed with one first locating hole, one second locating hole and one the 3rd locating hole in this through hole, and inner surface is provided with an above scallop section; One auxiliary joint chair, the one end forms one can be for the joint chair operate portions of screwdriver rod winding, the other end connects an extension rod, this extension rod passes described direction control piece through hole and enters in the axial hole of described joint chair, and its body of rod body portion is provided with and one holds the hole, squeezes the face that pushes away and end more than one and be formed with a limit and move back ditch; One spring and a pearl body are located at described extension rod and are held in the hole, and described pearl body is provided with by spring push, and this pearl body snaps in first locating hole of described direction control piece, or second locating hole, or in the 3rd locating hole; An above impeller is squeezed by described extension rod and to push away the face place and pack in the described joint chair, and cooperates with the scallop section of described direction control piece, is subjected to this scallop section to limit the setting of displacement action ground; One radial location pin is fixedly arranged on the described joint chair and supports described extension rod limit and move back in the ditch, and described auxiliary joint chair allows on joint chair rotation outwards not move back setting with taking off.

Characteristics of the present utility model and advantage are: the bottle opener with said structure, on operating bar screwdriver rod assembled portion the installation of screwdriver rod and by screwdriver rod when screw is made tight latching operation, the worker is held in the twisted strength on the lever body, be to snap in dialling of clutch discs concave arc groove by the support ring clamping piece to rotate work, operating bar twisted by clutch discs turn screw do locking action; And when screw reaches predetermined locking degree, be formed on the continuous commentaries on classics group power on operating bar and the clutch discs, can be under the situation of this resistance greater than the compression bounce of flexible member, the follow-up strength of reversing that is applied on the lever body of worker, the clamping piece of the support ring of this rotation only can pass in and out on the concave arc groove of clutch discs slidably, by the crowded torsion adjusting knob that pushes away of clutch discs, cause operating bar to do continuously the action of axial displacement back and forth, no longer produce clutch discs is effectively dialled the commentaries on classics drive, thus, be located at screwdriver rod on the screwdriver rod assembled portion when carrying out the tight latching operation of screw, the worker is applied to the commentaries on classics power of holding on the lever body, as long as surpass the effectively setting value of work torsion, support ring can escape to the clip of clutch discs, make the clutch discs that is not struck no longer transmit torsion to operating bar, allowing the screw normality maintain certain locking degree fixes, thereby overcome the defective of prior art, can limit excessive torsion and pass to operating bar, prevented that the excessive locking of screw from destroying.

And, different torsion demands in the locking operation of different size screw, only must on operating bar second threaded portion, rotate by the torsion adjusting knob, the operation operating bar is done axial displacement, more extends outward toward stationary magazine creel with operating bar, and original torsion adjusting nut is nearer apart from support ring, flexible member compression bounce is bigger, and the start relation that further closely reclines of clutch discs and support ring, change the support ring clamping piece and slide advance and retreat clutch discs concave arc groove opportunity, set different effective torsion and pass to the operating bar worker.

Description of drawings

Fig. 1 is a decomposing schematic representation of the present utility model.

Fig. 2 is a preferred embodiment schematic diagram of the present utility model.

Fig. 3 is the schematic diagram of part-structure section of the present utility model.

Fig. 4 is the generalized section of part-structure action of the present utility model.

Fig. 5 A is the generalized section before the part-structure action of the present utility model.

Fig. 5 B is the generalized section after the part-structure action of the present utility model.

Fig. 6 is the schematic diagram one of other embodiment of part-structure of the present utility model.

Fig. 7 is the schematic diagram two of other embodiment of part-structure of the present utility model.

Fig. 8 is the decomposing schematic representation of other embodiment of part-structure of the present utility model.

Fig. 9 is the schematic diagram one of section of the part-structure of Fig. 8.

Figure 10 is the schematic diagram two of section of the part-structure of Fig. 8.

Figure 11 A is the action schematic diagram one of the part-structure of Fig. 8.

Figure 11 B is the action schematic diagram two of the part-structure of Fig. 8.

Figure 11 C is the action schematic diagram three of the part-structure of Fig. 8.

The drawing reference numeral explanation:

10, lever body 11, stationary magazine creel

111, support ring 112, clamping piece

12, window 20, torsion setting device

21, operating bar 211, first threaded portion

212, original torsion adjusting nut 213, promotion face

214, second threaded portion 215, screwdriver rod assembled portion

216, indicate ring 23, clutch discs

231, concave arc 232, assembling trepanning

24, flexible member 24A, elastic disc

25, torsion is adjusted button 251, is held the transfer part

252, internal thread 30, joint chair

31, axial hole 32, radial location pin

40, direction control piece

41, through hole 411, first locating hole

412, second locating hole 413, the 3rd locating hole

42, inner surface 43, scallop section

50, auxiliary joint chair 51, joint chair operate portions

52, extension rod 53, appearance hole

531, spring 532, pearl body

54, promotion face 55, limit are moved back ditch

56, impeller 91, screwdriver rod

P1, primary importance P2, the second place

The specific embodiment

A kind of bottle opener of setting torsion that the utility model proposes sees also shown in Fig. 1,2,3, is provided with a torsion setting device 20 in its lever body 10, and this torsion setting device includes:

One stationary magazine creel 11 is installed in the lever body 10,

One support ring 111 is installed in the stationary magazine creel 11, the rotating of one with stationary magazine creel 11, and ring body one end face is equiped with a plurality of rotatable wear-resisting steel ball clamping pieces 112;

One operating bar 21, the one end penetrates support ring 111, and be provided with one first threaded portion 211 in this end position that runs through end, and more than one promotion face 213 and one second threaded portion 214 are formed on operating bar 21 body portions, and the other end of operating bar 21, then be provided with a screwdriver rod assembled portion 215, can supply the screwdriver rod winding;

One clutch discs 23, the clamping piece 112 of the relative support ring 111 of one end is formed with a plurality of concave arc grooves 231, and pars intermedia offers an assembling trepanning 232 corresponding to the promotion face 213 of operating bar 21, by this assembling trepanning 232 clutch discs 23 is set on the operating bar 21 and cooperates with promotion face 213, make the clutch discs 23 of rotation can twist operating bar 21, and each clamping piece 112 on the support ring 111 snaps in the concave arc groove 231 of a corresponding position respectively;

One flexible member 24 can be a compression spring, be set on the operating bar 21 by operating bar 21 first threaded portions 211 ends, and an end is stressed on the support ring 111;

One torsion adjusting knob 25, be located at stationary magazine creel 11 and lever body 10 outsides, make and hold transfer part 251 and be emerging in lever body 10 front ends, and its middle inside has internal thread 252 and is screwed on operating bar 21 second threaded portions 214, make the front end of screwdriver rod assembled portion 215 extend torsion adjusting knob 25 outsides, and supply clutch discs 23 backups with the inner face of torsion adjusting knob 25;

One original torsion adjusting nut 212, be screwed on operating bar 21 first threaded portions 211, and flexible member 24 is done the compression of predetermined extent, torsion adjusting knob 25 is done at a stopper that draws that is limited by operating bar 21, produce compressing power to clutch discs 23 with the compression bounce effect of flexible member 24, the clamping piece 112 that limits support ring 111 withdraws from the concave arc groove 231 of clutch discs 23;

In the installation of carrying out screwdriver rod 91 instruments on the operating bar 21 screwdriver rod assembled portion 215, and by screwdriver rod 91 when screw is made tight latching operation, the worker is held in the twisted strength on the lever body 10, snap in dialling of clutch discs 23 concave arc grooves 231 by support ring 111 clamping pieces 112 and rotate work, make operating bar 21 be turned screw and do the locking action by clutch discs 23 twistings; And when screw reaches predetermined locking degree, be formed on the continuous commentaries on classics resistance on operating bar 21 and the clutch discs 23, can be under the situation of this resistance greater than the compression bounce of flexible member 24, the follow-up strength of reversing that is applied on the lever body 10 of worker, as Fig. 5 A and Fig. 5 B, the support ring 111 of this rotation, 112 of its clamping pieces can pass in and out on the concave arc groove 231 of clutch discs 23 slidably, by the clutch discs 23 crowded torsion adjusting knobs 25 that push away, cause operating bar 21 to do continuously the action of axial displacement back and forth, no longer producing clutch discs 23 effectively dialled changes drives, limits excessive torsion according to this and passes to operating bar 21, prevents the screw destruction that excessively locks; And the different torsion demands in the locking operation of different size screw, as shown in Figure 4, only must on operating bar 21 second threaded portions 214, rotate by torsion adjusting knob 25, operation operating bar 21 is done axial displacement, more outside stationary magazine creel 11, extend with operating bar 21, original torsion adjusting nut 212 is nearer apart from support ring 111, flexible member 24 compression bounces are bigger, and clutch discs 23 concerns with the start that support ring 111 further closely reclines, change support ring 111 clamping pieces 112 and slide 231 opportunitys of advance and retreat clutch discs 23 concave arc grooves, set different effectively torsion and pass to operating bar 21 work.

That is the utility model uses the locking operation of screw, by different torsion demands, only must can set out desirable work torsion by the rotation of torsion adjusting knob 25, prevents that effectively screw is because of excessively reversing the destruction of being caused.

And, the utility model on the implementation, as Fig. 1,2,3, wherein, be screwed on the original torsion adjusting nut 212 on operating bar 21 first threaded portions 211, it is to the modulation of flexible member 24 compression degrees, can be in the member assembling process, initial effective torsion of rotation correction bottle opener, and the end of these operating bar 21 first threaded portions 211 ends are installed with a sign ring 216 with color and luster; And lever body 10 should indicate ring 216 relatively.Its outside is provided with one can have an X-rayed this sign ring 216 and surperficial window 12 with torsion scale and mark, cooperate Fig. 4, during these torsion adjusting knob 25 rotating operations, the formed torsion setting of these operating bar 21 axial displacements changes, can inspect by window 12 and indicate ring 216 positions, direct scale and mark from window 12 known torsion setting or adjusted reference value, makes the adjusting setting value operation of torsion more convenient.

The utility model on the implementation, as Fig. 3, structure is stirred in the elasticity clutch of relevant support ring 111 steel ball clamping pieces 112 clips in clutch discs 23 concave arc grooves 231, this support ring 111 is stirred face with reclining mutually of clutch discs 23, as Fig. 6, can relative setting be the ratchet mating surface, also have the same function function; And the compression spring spare 24 of decision torsion transmission output size, as Fig. 7, also can by majority mutually stacked washer type elastic disc 24A be replaced and constituted, have equivalent function and reach.

Moreover the utility model is implemented, and as Fig. 3, screwdriver rod assembled portion 215 front ends of operating bar 21 manifest torsion adjusting knob 25 outsides, and allowing can be in conjunction with a torsional direction change over adapter on the screwdriver rod assembled portion 215; This torsional direction change over adapter as Fig. 8,9,10, has a joint chair 30 that is installed on the screwdriver rod assembled portion 215, and this joint chair 30 has an axial hole 31; One direction control piece 40 covers on this joint chair 30, and this direction control piece 40 has a through hole 41 and an inner surface 42, and the hole face of this through hole 41 is provided with one first locating hole 411, one second locating hole 412 and one the 3rd locating hole 413; This inner surface 42 is provided with two across the relative scallop section 43 of this through hole 41; One auxiliary joint chair 50, the one end is established a joint chair operate portions 51 can be for the bottle opener winding, the other end then connects an extension rod 52, this extension rod 52 passes direction control piece 40 through holes 41 and enters in joint chair 30 axial holes 31, establish one in the body of rod body portion and hold hole 53, establish a spring 531 in this appearance hole 53, this spring 531 pushing tows one pearl body 532, this pearl body 532 can be positioned this first, the second or the 3rd decides hole, hole 411,412 and 413 on one of them, form two relative crowded faces 54 that push away on the outer diametric plane of this extension rod 52, these two are squeezed and to push away face 54 and pushed away by two steel ball impellers 56 to pull and rotate, and two impellers 56 are subjected to the offset qualification of these two scallop section 43 respectively; And these extension rod 52 ends are concaved with a limit and advance ditch 55, one radial location pins 32 and penetrate this joint chair 30 and support this and limit in the ditch 55, make this auxiliary joint chair 50 allow on this joint chair 30 rotation not move back and take off.

See also Fig. 9,10, in the operation, the left rotation and right rotation of this direction control piece 40 can optionally be controlled the clip position of pearl body 532 from first locating hole 411, switch to the clip position of second locating hole 412 or the 3rd locating hole 413, conversion goes out the actuator state relation as 56 of the scallop section 43 of Figure 11 A, Figure 11 B, Figure 11 C and impellers;

Shown in Figure 11 A, because impeller 56 is positioned at the central authorities of this scallop section 43, allow impeller 56 left and right displacement on promotion face 54, therefore, these joint chair 30 clockwise or anticlockwise revolution actions, this impeller 56 all relatively the rotation direction of joint chair 30 push away that the small distance displacement produces the action of folder lock on the face 54 squeezing, and the moving part 56 that is pushed that makes that extension rod 52 can be two-way squeezes and pushes away twisting.

Do not put off stock 52 rotations if do not drive when desiring to make joint chair 30 to circle round counterclockwise, shown in Figure 11 B, scallop section 43 switchings are the form that impeller 56 is positioned at primary importance P1 place, because impeller 56 (by displacement restriction) when joint chair 30 circles round counterclockwise can not pushed away by counter, therefore impeller 56 is between joint chair 30 and crowded 54 in the face that pushes away, can only be when the clockwise twisting action of joint chair 30, this impeller 56 just can be effectively forms the folder lock and squeezes and put off the action that stock 52 reverses clockwise squeezing to push away on the face 54; And joint chair 30 is when circling round counterclockwise, and the slipping action appears in this impeller 56 and joint chair 30 (keeping the gap), extension rod 52 is not exerted oneself.

In like manner, the action of desiring joint chair 30 is reversed does not clockwise drive extension rod 52, shown in Figure 11 C, only scallop section 43 switchings must be impeller 56 and be positioned at second place P2 place, restriction impeller 56 is driven pushing and is moved when joint chair 30 clockwise rotates, just can drive extension rod 52 when so, joint chair 30 can only rotate in the counterclockwise direction rotates.

By above-mentioned structure, as Fig. 9, the auxiliary joint chair 50 that should be the one interlock with extension rod 52, after can being installed in its front end joint chair operate portions 51 for screwdriver rod, be used to carry out the locking of screw or loosen, and in the course of work, not only can make torsion setting at any time, and can switch the force direction that of bottle opener by the rotation of direction control piece 40, increase the convenience that bottle opener uses.

Though the utility model discloses with specific embodiment; but it is not in order to limit the utility model; any those skilled in the art; the displacement of the equivalent assemblies of under the prerequisite that does not break away from design of the present utility model and scope, having done; or, all should still belong to the category that this patent is contained according to equivalent variations and modification that the utility model scope of patent protection is done.

Claims (8)

1. the bottle opener that can set torsion is characterized in that, is provided with a torsion setting device in its lever body, and this torsion setting device includes:

One stationary magazine creel is installed in the described lever body;

One support ring be installed in rotationally in the aforementioned fixation tube with described stationary magazine creel rotation integratedly, and its ring body one end face is provided with a plurality of clamping pieces;

One operating bar, the one end penetrates described support ring, and be provided with one first threaded portion in this end position that runs through end, more than one promotion face and one second threaded portion are formed at described start rod body, and the other end of described operating bar be provided with one can be for the screwdriver rod assembled portion of screwdriver rod winding;

One clutch discs, the clamping piece of the described relatively support ring of one end is formed with a plurality of concave arc grooves, and the intermediate portion offers an assembling trepanning corresponding to the promotion face of aforementioned operating bar, by this assembling trepanning described clutch discs is set on the aforementioned operating bar and cooperates with described promotion face, the clutch discs of rotating can twist operating bar ground and be provided with, and each clamping piece on the described support ring snaps in the concave arc groove of a corresponding position respectively;

One flexible member is set on the operating bar by the aforementioned operating bar first threaded portion end, and an end is stressed on the described support ring;

One torsion adjusting knob, be located at described stationary magazine creel and lever body exterior, it is held the transfer part and is emerging in described lever body front end, and inside has internal screw-thread screw on operating bar second threaded portion in the middle of it, the front end of described screwdriver rod assembled portion extends torsion adjusting knob outside, and the inner face of this torsion adjusting knob and clutch discs backup are provided with;

One original torsion adjusting nut, be screwed on described operating bar first threaded portion, and to described flexible member compression setting, described torsion adjusting knob is done at a stopper that draws that is limited by operating bar, produce compressing power to clutch discs with the compression bounce effect of flexible member, the clamping piece that limits support ring withdraws from the concave arc groove of clutch discs.

2. a kind of bottle opener of setting torsion as claimed in claim 1 is characterized in that, a plurality of clamping pieces that described support ring one end face is installed are for rolling wear-resisting steel ball.

3. a kind of bottle opener of setting torsion as claimed in claim 1 is characterized in that, the face of stirring that reclines mutually of described support ring and clutch discs is oppositely arranged and is the ratchet mating surface.

4. a kind of bottle opener of setting torsion as claimed in claim 1 is characterized in that, the described stressed flexible member of compression on the support ring that is resisted against is the compression spring.

5. a kind of bottle opener of setting torsion as claimed in claim 1 is characterized in that, described be resisted against the stressed flexible member of compression on the support ring by majority mutually stacked washer type elastic disc constituted.

6. a kind of bottle opener of setting torsion as claimed in claim 1, it is characterized in that, the modulation that the described original torsion adjusting nut that is screwed on operating bar first threaded portion has to the flexible member compression degree, be initial effective torsion, and the end of this operating bar first threaded portion end is installed with a sign ring at member assembling process rotation correction bottle opener; The described lever body outside of this sign ring relatively is provided with one and can has an X-rayed this signs ring and surperficial window with torsion scale and mark.

7. a kind of bottle opener of setting torsion as claimed in claim 1, it is characterized in that, the screwdriver rod assembled portion front end of described operating bar manifests torsion adjusting knob outside, on this screwdriver rod assembled portion in conjunction with a changeable torsional direction to set the change over adapter of bottle opener torsion.

8. a kind of bottle opener of setting torsion as claimed in claim 1 is characterized in that, in conjunction with the change over adapter of a changeable torsional direction with setting bottle opener torsion, this torsional direction change over adapter comprises on the screwdriver rod assembled portion of described operating bar:

One is installed in the joint chair on the screwdriver rod assembled portion, has an axial hole in this joint chair;

One direction control piece covers on aforementioned joint chair, has a through hole and an inner surface, and is formed with one first locating hole, one second locating hole and one the 3rd locating hole in this through hole, and inner surface is provided with an above scallop section;

One auxiliary joint chair, the one end forms one can be for the joint chair operate portions of screwdriver rod winding, the other end connects an extension rod, this extension rod passes described direction control piece through hole and enters in the axial hole of described joint chair, and its body of rod body portion is provided with and one holds the hole, squeezes the face that pushes away and end more than one and be formed with a limit and move back ditch;

One spring and a pearl body are located at described extension rod and are held in the hole, and described pearl body is provided with by spring push, and this pearl body snaps in first locating hole of described direction control piece, or second locating hole, or in the 3rd locating hole;

An above impeller is squeezed by described extension rod and to push away the face place and pack in the described joint chair, and cooperates with the scallop section of described direction control piece, is subjected to this scallop section to limit the setting of displacement action ground;

One radial location pin is fixedly arranged on the described joint chair and supports described extension rod limit and move back in the ditch, and described auxiliary joint chair allows on joint chair rotation outwards not move back setting with taking off.

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