CN208665431U - Fold mechanism and scooter including the fold mechanism - Google Patents

Abstract

The utility model relates to a kind of fold mechanism and including the scooter of the fold mechanism, fold mechanism, it include: the first fixed plate, connecting plate and locking device, the connecting plate is articulated in first fixed plate, the locking device is threaded through in the connecting plate, and at least two fixation holes fixed for locking device are offered in first fixed plate.The utility model fold mechanism and its scooter structure are ingenious, and folding convenient, locking is firm, and security performance greatly improves.

Description

Fold mechanism and scooter including the fold mechanism

Technical field

The utility model relates to a kind of fold mechanism and including the scooter of the fold mechanism.

Background technique

The fold mechanism of existing scooter is complicated, and it is inconvenient to fold, and it is unstable securely to unfold and fold state, very greatly The handling and convenience of scooter is affected in degree.

Utility model content

The utility model relates to fold mechanism and the scooter including the fold mechanism is, it can be achieved that fast folding, and opens up The phenomenon that scooter is highly stable securely when opening and folding, and does not have shaking convenient for manipulation and is carried.

The utility model is achieved through the following technical solutions:

A kind of fold mechanism, comprising: the first fixed plate, connecting plate and locking device, the connecting plate are articulated in described One fixed plate, the locking device are threaded through in the connecting plate, and the locking device can be along the direction perpendicular to connecting plate It is mobile, at least two fixation holes fixed for locking device are offered in first fixed plate, the first fixed plate is also articulated with First connecting rod, the other end of first connecting rod are articulated with second connecting rod, and the other end of second connecting rod is pivotally connected the connecting plate.

By using above-mentioned technical proposal, the pedal of the first fixed plate and scooter is removable to be connected, and is opened in the first fixed plate If at least two fixation holes, it is set as fixation hole, rather than slot or other structures, it is ensured that fixed plate is only being locked with connecting plate Determine that the fixation under each state can be realized under the action of device, the position of each fixation hole is different, can make the steering yoke of scooter There is different angles between pedal.Specifically, locking device can sink into the fixation hole of first position, when expansion with complete It is fixed at the position of connecting plate and fixed plate, the two is made not generate relative motion；When needing to fold, by locking device along perpendicular to The direction of connecting plate is mobile to extract out of first position fixation hole, i.e. usable rotational direction bar, and locking device is made to sink into second In the fixation hole of position, fixed with completing the position of connecting plate and fixed plate.Fold mechanism folding convenient, easy to operate, energy can Fixation by steadily carrying out each position state to scooter.First connecting rod and being provided with for second connecting rod are conducive to fix to first The position of plate and connecting plate is fixed and supports, and keeps overall structure more stable, and first connecting rod is articulated with second connecting rod, It is convenient for folding.

The locking device includes locking bar and spring as a further improvement of the utility model, and locking bar is threaded through connection In plate, the end of locking bar is sticking department, and sticking department can be fallen into fixation hole to complete to fix；Spring one end is against sticking department, separately One end is resisted against on connecting plate.By using above-mentioned technical proposal, the reset of spring being provided with conducive to locking device.

It is removably connected with handle on the locking bar as a further improvement of the utility model, locking bar is close to handle External thread section is arranged to be bolted on handle in one end, and handle has screwed pipe in one in the position that is spirally connected accordingly；Alternatively, locking bar is close Internal screw thread is arranged in handle one end, and handle is in the position setting outer screwed pipe that is spirally connected accordingly.By using above-mentioned technical proposal, handle It is provided with and is conducive to operate locking bar.Locking bar by the way of being threadedly coupled, may make locking bar position-adjustable with handle, with Adapt to size or the difference of position between fixed plate and connecting plate, positive lock of being more convenient for.

The connecting plate is two as a further improvement of the utility model,.By using above-mentioned technical proposal, connection Plate is two, can increase integrally-built intensity, improves service performance, keeps fold mechanism more stable, and first connecting rod and second connects Bar can be between two connecting plates, structurally reasonable, when folding and being unfolded, occupy little space.Spring one end is another against sticking department End is resisted against on the connecting plate far from the first fixed plate, is also convenient for the installation and reset of spring.

First connecting rod is symmetrically arranged two as a further improvement of the utility model, and second connecting rod is in two Between first connecting rod.By using above-mentioned technical proposal, first connecting rod is two, and integrated connection intensity also can be improved, make to connect Reliable and stable positional relationship is maintained between plate and fixed plate.

First connecting rod is one as a further improvement of the utility model, and the upper end of first connecting rod is offered for holding Receive the groove of second connecting rod.By using above-mentioned technical proposal, the upper end of first connecting rod opens up fluted, i.e., first connecting rod is upper The end that is in U-shape is held, hinged second connecting rod is used for, the gap of groove can accommodate second connecting rod, can between first connecting rod and second connecting rod It relatively rotates, and first connecting rod is as a whole, structural strength improves, slow-roll stabilization.

It as a further improvement of the utility model, further include the second fixed plate, the second fixed plate and the first fixed plate position Set symmetrical, connecting plate is between the first fixed plate and the second fixed plate, is offered in the second fixed plate sliding for locking device Capable arc-shaped slot.By using above-mentioned technical proposal, the second fixed plate on the one hand can enhancing structure intensity, on the other hand can make Obtain the operation more steady and smooth of locking device.

The both ends of arc-shaped slot have an aperture ratio arc-shaped slot spacing dimension as a further improvement of the utility model, Big location hole, have on the locking device with the matched path section of arc-shaped slot and with the matched major diameter section of location hole.It is logical It crosses by adopting the above technical scheme, the aperture at arc-shaped slot both ends is larger, convenient for having larger-diameter one section to be in locking device Major diameter section is fallen into the location hole, completes the limit of locking device, after major diameter section and location hole misplace, path section can arcuately lead to Slot sliding.

First connecting rod includes the first linkage section, the second linkage section, third connection as a further improvement of the utility model, Section and the 4th linkage section, first linkage section one end are pivotally connected second connecting rod, and the other end connects one end of the second linkage section, the second connection One end of the other end connection third linkage section of section, the other end of third linkage section connect one end of the 4th linkage section, and the 4th connects The other end for connecing section is articulated in the first fixed plate；First linkage section and the 4th linkage section are in the same side of third linkage section. By using above-mentioned technical proposal, on the one hand the concrete shape of first connecting rod is conducive to consolidate connecting plate and fixed Board position Fixed and support, on the other hand, but also the first connecting rod occupied space of folding and expanded position is reasonable, structure is well-balanced, does not generate Interference.

The lower part of connecting plate has a curved hook portion as a further improvement of the utility model,.By using above-mentioned skill Art scheme, in fold mechanism expansion, curved hook portion can be hooked in fixed plate and the fixing axle of scooter footboard, convenient for maintaining folding The stabilization of folded mechanism, increases intensity.

The lower part tool of connecting plate is there are two lug boss as a further improvement of the utility model, between two lug bosses With an angle.By using above-mentioned technical proposal, when fold mechanism unfolded state, the lug boss for being below position is resisted against In fixing axle, supporting folding mechanism can be stablized to a certain extent, when folded state, the lug boss in top position is in rotation one It leans behind clamp angle with fixing axle, certain firm effect is equally played to the fold mechanism of folded state.

Scooter, including fold mechanism described in any of the above-described technical solution, further include pedal, steering yoke, attachment base, Front fork and wheel, the first fixed plate and the second fixed plate are fixedly connected with the pedal, and connecting plate connects steering yoke by attachment base, The lower end of steering yoke is pivotally connected wheel by front fork.By using above-mentioned technical proposal, scooter folding convenient is operated conveniently, and Energy positive lock, stable, safe, durable when folding and being unfolded.

A positioning seat is fixedly connected on steering yoke as a further improvement of the utility model, positioning seat is in connection The top position of seat outwardly protrudes on positioning seat and is provided at least two positioning regions.By using above-mentioned technical proposal, two positioning Being provided with for portion is conducive in folded state, and second connecting rod sinks into prevent steering yoke from rotating between two positioning regions, improves peace Quan Xing, convenient for the carrying of scooter.

As a further improvement of the utility model, on attachment base, there are two symmetrical engaging lug, connecting plate is fixed to be connected tool It is connected to the outside of engaging lug, the second connecting rod is articulated in the inside of two engaging lugs.By using above-mentioned technical proposal, The connection of engaging lug being provided with conducive to second connecting rod, the position for being also convenient for connecting plate are fixed, and overall structure is more reasonable compact.

According to the utility model fold mechanism and including the scooter of the fold mechanism, structure is well-balanced rationally, easy to operate It is convenient, and when spread and folded state, it is stable and firm, convenient for the reliable manipulation of scooter, largely improve safety Energy.

For the above and other objects, features and advantages of the utility model can be clearer and more comprehensible, preferable reality is cited below particularly Example is applied, and cooperates institute's accompanying drawings, is described in detail below.

Detailed description of the invention

Fig. 1 is the structure of the fold mechanism that the utility model one embodiment provides and the scooter including the fold mechanism Schematic diagram.

Fig. 2 is the part of the fold mechanism that the utility model one embodiment provides and the scooter including the fold mechanism Perspective view of the explosion.

Fig. 3 is the structural representation when scooter that the utility model one embodiment provides conceals pedal and the second fixed plate Figure.

When Fig. 4 is the fold mechanism that provides of the utility model one embodiment and scooter expansion including the fold mechanism Structural schematic diagram.

Fig. 5 is the fold mechanism that provides of the utility model one embodiment and when the scooter including the fold mechanism folds Structural schematic diagram.

Fig. 6 is the fold mechanism that provides of the utility model one embodiment and when the scooter including the fold mechanism folds The structural schematic diagram of another angle.

Fig. 7 is the connecting board structure schematic diagram that the utility model one embodiment provides.

Fig. 8 is the structural schematic diagram for the first fixed plate that the utility model one embodiment provides.

Fig. 9 is the structural schematic diagram for the second fixed plate that the utility model one embodiment provides.

Figure 10 is the structural schematic diagram for the first connecting rod that the utility model one embodiment provides.

Figure 11 is the structural schematic diagram for the locking device that the utility model one embodiment provides.

Figure 12 is the fold mechanism that another embodiment of the utility model provides and the scooter including the fold mechanism Structural schematic diagram.

Figure 13 is the fold mechanism of another angle that another embodiment of the utility model provides and including the fold mechanism Scooter structural schematic diagram.

Figure 14 is fold mechanism when concealing the second fixed plate that provides of another embodiment of the utility model and including the folding The structural schematic diagram of the scooter of folded mechanism.

Figure 15 is the connecting board structure schematic diagram that another embodiment of the utility model provides.

Figure 16 is the structural schematic diagram for the first connecting rod that another embodiment of the utility model provides.

In figure: pedal 11, the first fixed plate 12, first connecting rod 13, second connecting rod 14, connecting plate 15, steering yoke 16, positioning Seat 17, attachment base 18, front fork 19, wheel 20, locking device 21, the second fixed plate 22, fixing axle 23, pivot 24, first connect Section the 131, second linkage section 132, third linkage section 133, the 4th linkage section 134, U-shaped end 135, through-hole 1, through-hole 2 152, Through-hole 3 153, curved hook portion 154, lug boss 155, positioning region 171, engaging lug 181, handle 211, interior screwed pipe 212, external screw thread Section 213, major diameter section 214, path section 215, spring 216, sticking department 217, arc-shaped slot 221, location hole 222, groove 2171.

Specific embodiment

Further to illustrate technical means and efficacy that the utility model is taken by the predetermined purpose of utility model of realization, Attached drawing and preferred embodiment are fastened below, to foundation specific embodiment of the present utility model, structure, feature and its effect, in detail It describes in detail bright as after.

In this application unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc. Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can be machine Tool connection, is also possible to be electrically connected；It can be directly connected, two members can also be can be indirectly connected through an intermediary Connection inside part.For the ordinary skill in the art, above-mentioned term can be understood in this Shen as the case may be Please in concrete meaning.

Embodiment 1

Scooter please refers to Fig. 1 to Figure 11, have a fold mechanism, pedal 11, steering yoke 16, front fork 19 and wheel 20, Pedal connects fold mechanism, and fold mechanism connects steering yoke 16, and the lower end of steering yoke 16 is pivotally connected wheel 20 by front fork 19.

Fig. 1 to Fig. 2 is please referred to, fold mechanism includes fixed plate, connecting plate 15, first connecting rod 13, second connecting rod 14, connection Seat 18 and locking device 21, fixed plate are installed on pedal 11, and one end of first connecting rod 13 is articulated in fixed plate, other end pivot joint The other end of one end of second connecting rod 14, second connecting rod 14 is pivotally connected attachment base 18, and steering yoke 16 is threaded through in attachment base 18, and can It is rotated relative to attachment base 18；15 one end of connecting plate is fixedly connected on attachment base 18, and the other end is articulated in fixed plate, locking dress 21 medium positions for being arranged in connecting plate 15 are set, locking device 21 can be moved along the direction perpendicular to connecting plate 15, and be inserted in solid Locking is completed in the fixation hole of fixed board.

Fig. 8 and Fig. 9 is please referred to, fixed plate includes the first fixed plate 12 and the second fixed plate 22, and connecting plate 15 is two, the One fixed plate and the second fixed plate are located at the outside of two connecting plates 15；At least two fixation holes are offered in first fixed plate 12 121, the arc-shaped slot 221 slided for locking device is offered in the second fixed plate 22, the both ends of arc-shaped slot have an aperture The location hole 222 bigger than arc-shaped slot spacing dimension.

It please refers to Fig.1 to Fig.3, first connecting rod 13 is symmetrically arranged two, and two first connecting rods 13 are located at second connecting rod 14 outside.

Figure 11 is please referred to, locking device 21 includes handle 211 and locking bar, and external thread section is arranged close to one end of handle in locking bar 213 to be bolted on handle 211, handle 211 in the position that is spirally connected accordingly with screwed pipe 212 in one, locking bar far from handle one End is sticking department 217, and the cross sectional shape of sticking department is circle, is matched with the shape of fixation hole, sticking department outer end offer with The matched groove 2171 of guarded blade utility knife, locking bar middle part have a path section 215 and major diameter section 214；A spring is arranged on locking bar 216, spring one end connects sticking department, and the other end is resisted against the inside of the second fixed plate 22.

Interior screwed pipe 212 can be matched with external thread section 213, in another arrangement, on locking bar can be replaced with external thread section interior Interior screwed pipe is replaced with outer screwed pipe, can equally achieved the goal by screw thread.

Referring to Fig. 7, through-hole 1, through-hole 2 152, through-hole 3 153 and curved hook portion 154 are offered on connecting plate 15, Through-hole 1 is substantially with the quadrilateral shape of rounded corner, and through-hole 2 152 and through-hole 3 153 are round, and through-hole 2 152 is used It is worn in locking bar；Through-hole three is connecting plate and fixed plate pivoted hole, wherein wearing pivot 24；Curved hook portion 154 can hook in fixation In the fixing axle 23 of plate and pedal；Referring to Fig. 1, close to the first fixed plate connecting plate 15 on through-hole 2 152 aperture with The diameter of sticking department 217 matches, the aperture of the through-hole two on the connecting plate far from the first fixed plate and the diameter of major diameter section 214 Match.

A positioning seat 17 is also fixedly connected on steering yoke 16, positioning seat 17 is in the top position of attachment base 18, positioning It is outwardly protruded on seat 17 and is provided at least two positioning regions 171, have gap to accommodate second connecting rod between two positioning regions 171 14。

On attachment base 18, there are two symmetrical engaging lug 181, second connecting rods 14 to be articulated on engaging lug 181 for tool, two connections Gap between ear 181 can accommodate second connecting rod 14, so that second connecting rod 14 does not generate interference with engaging lug during rotation.

Referring to Fig. 10, first connecting rod 13 includes the first linkage section 131, the second linkage section 132,133 and of third linkage section 4th linkage section 134,131 one end of the first linkage section pivot joint second connecting rod 14, one end of the other end the second linkage section 132 of connection, One end of the other end connection third linkage section 133 of second linkage section, the other end of third linkage section 133 connect the 4th linkage section The other end of 134 one end, the 4th linkage section 134 is articulated in fixed plate.First linkage section 131 and third linkage section 133 are flat Row setting, the first linkage section and the 4th linkage section are in the same side of third linkage section.

In detail, when unfolded state, referring to Fig. 4, the sticking department 217 in locking device on locking bar sinks into the first fixed plate It is upper in the fixation hole of front wheel of scooter wheel shaft, i.e. the fixation hole 121 of first position, the major diameter section 214 on locking bar sinks into the The arc groove of two fixed plates is in the location hole 222 of steering yoke one end, i.e. the location hole of first position, curved hook portion 154 Hook is in (please referring to Fig. 3) in fixed plate and the fixing axle of pedal 23；

When needing to fold, along the direction perpendicular to 15 place plane of connecting plate, the handle of locking device is pulled outward 211, detach the sticking department 217 of locking bar from the fixation hole 121 of first position, major diameter section 214 is simultaneously from the second fixed plate On arc-shaped slot first position location hole 222 in detach outward, path section 215 sinks into arc-shaped slot and can edge Arc-shaped slot 221 slides, and so as to fold connecting plate 15 to the direction of fixed plate, that is, pedal 11, that is, realizes the folding of scooter It is folded；Since 216 one end of spring connects sticking department 217, the other end is resisted against the inside of the second fixed plate 22, and spring 216 can be pressure Spring can then remove external force to the work of handle constantly to sticking department one active force mobile to the first fixed plate direction With when scooter is gone to folding position, sticking department 217 can sink into automatically in the corresponding fixation hole in folding position；

At folding position, Fig. 5, Fig. 6 are please referred to, the sticking department 217 in locking device on locking bar sinks into the first fixed plate It goes up in the fixation hole far from front wheel of scooter wheel shaft, i.e. the fixation hole of the second position, it is solid that the major diameter section 214 on locking bar sinks into second The arc groove of fixed board is far from the location hole 222 of front wheel of scooter wheel shaft, i.e., the location hole of the second position, second connecting rod 14 are fallen into Between two positioning regions 171, steering yoke 16 does not rotate.

It when needing to be unfolded, also needs outward to detach sticking department 217 out of the second position fixation hole, while big Diameter section 214 detaches outward from the location hole of the second position, and path section 215 sinks into arc-shaped slot and can arcuately through slot 221 slidings, achievable expansion.

When needing position relative to handle of locking bar in adjusting and locking mechanism, locking bar can be turned with guarded blade utility knife, with Reach suitable position.

In other embodiments, fixed plate can be one, i.e. the first fixed plate, and connecting plate can be one, first connecting rod It can be one, equally be able to achieve scheme purpose.

Embodiment 2

Please refer to Figure 12 to Figure 16, in the present embodiment, the first connecting rod 13 in fold mechanism is one, first connecting rod 13 Upper end offers the groove for accommodating second connecting rod 14, i.e. the upper end of first connecting rod, which is in U-shape, pitches structure, is U-shaped end 135, U-shaped End 135 is articulated with second connecting rod 14, and the lower end of first connecting rod 13 is articulated in the first fixed plate and the second fixed plate by pivot 24 On, the U-shaped fork structure at U-shaped end, which is formed by gap, can accommodate second connecting rod 14 so as to its rotation；Connecting plate 15 is pivotally connected fixed plate One end tool there are two lug boss 155, there is an angle, connecting plate 15 is articulated in by fixing axle 23 between two lug bosses 155 In first fixed plate and the second fixed plate, the first fixed plate and the second fixed plate are installed on pedal 11 by other clamp devices On, when unfolded state, the upper position lug boss 155 of connecting plate 15 can be resisted against in fixing axle, when folded state, connecting plate 15 The lug boss 155 of upper position can be resisted against in fixing axle.

By a boss transition between sticking department and path section in locking device, boss diameter is small greater than path section diameter In sticking department diameter, spring can be placed on this boss, and spring one end can be against sticking department, and the other end is resisted against connecting plate, be convenient for It resets.

The scheme of the present embodiment, other structures and principle are same as Example 1, the specific structure of first connecting rod and connecting plate It is also convenient for that entire fold mechanism is made to keep stablizing in expansion and folded state, and overall structure is light ingenious.

The above descriptions are merely preferred embodiments of the present invention, not makees in any form to the utility model Limitation, although the utility model with preferred embodiment disclose as above, be not intended to limit the utility model, Ren Heben Field technical staff is not departing within the scope of technical solutions of the utility model, makes when using the technology contents of the disclosure above A little change or the equivalent embodiment for being modified to equivalent variations, but it is all without departing from the content of the technical scheme of the utility model, foundation The technical essence of the utility model any simple modification, equivalent change and modification to the above embodiments still fall within this In the range of utility model technical solution.

Claims (14)

1. a kind of fold mechanism characterized by comprising the first fixed plate (12), connecting plate (15) and locking device (21), institute It states connecting plate (15) and is articulated in first fixed plate (12), the locking device (21) is threaded through in the connecting plate (15), At least two fixation holes (121) fixed for locking device (21), the first fixed plate are offered on first fixed plate (12) (12) it is also articulated with first connecting rod (13), the other end of first connecting rod (13) is articulated with second connecting rod (14), second connecting rod (14) The other end be pivotally connected the connecting plate (15).

2. fold mechanism as described in claim 1, which is characterized in that the locking device includes locking bar and spring (216), lock Bar is threaded through in connecting plate (15), and the end of locking bar is sticking department (217), sticking department (217) can fall into fixation hole (121) with It completes to fix；Against sticking department (217), the other end is resisted against on connecting plate (15) for spring (216) one end.

3. fold mechanism as claimed in claim 2, which is characterized in that be removably connected with handle (211), lock on the locking bar Bar is close to one end of handle (211) setting external thread section (213) to be bolted on handle (211), and handle (211) is in corresponding spiral shell Connecing position has screwed pipe (212) in one；Alternatively, internal screw thread is arranged close to handle (211) one end in locking bar, handle is spirally connected accordingly Outer screwed pipe is arranged in position.

4. fold mechanism as claimed in claim 1 or 2, which is characterized in that the connecting plate (15) is two.

5. fold mechanism as described in claim 1, which is characterized in that first connecting rod (13) be symmetrically arranged two, second Connecting rod (14) is between two first connecting rods (13).

6. fold mechanism as described in claim 1, which is characterized in that first connecting rod (13) is one, first connecting rod (13) Upper end offers the groove for accommodating second connecting rod (14).

7. the fold mechanism as described in claims 1 or 2 or 5 or 6, which is characterized in that it further include the second fixed plate (22), second Fixed plate (22) and the first fixed plate (12) position are symmetrical, connecting plate (15) be in the first fixed plate and the second fixed plate it Between, the arc-shaped slot (221) slided for locking device (21) is offered in the second fixed plate.

8. fold mechanism as claimed in claim 7, which is characterized in that the both ends of arc-shaped slot (221) have an aperture ratio arc The big location hole of shape through slot spacing dimension (222), have on the locking device with the matched path section of arc-shaped slot (215) and With the matched major diameter section (214) of location hole.

9. the fold mechanism as described in claims 1 or 2 or 5 or 8, which is characterized in that first connecting rod (13) includes the first connection Section (131), the second linkage section (132), third linkage section (133) and the 4th linkage section (134), the first linkage section (131) one end It is pivotally connected second connecting rod (14), the other end connects the one end of the second linkage section (132), the other end connection third of the second linkage section connects One end of section (133) is connect, the other end of third linkage section (133) connects one end of the 4th linkage section (134), the 4th linkage section (134) the other end is articulated in the first fixed plate；First linkage section and the 4th linkage section are in the same side of third linkage section.

10. the fold mechanism as described in claims 1 or 2 or 5 or 8, which is characterized in that the lower part of connecting plate (15) has an arc Shape hook portion (154).

11. the fold mechanism as described in claims 1 or 2 or 5 or 6 or 8, which is characterized in that there are two the lower part tools of connecting plate Lug boss (155) has an angle between two lug bosses (155).

12. scooter, which is characterized in that including the described in any item fold mechanisms of claim 1-11, further include pedal (11), Steering yoke (16), attachment base (18), front fork (19) and wheel (20), the first fixed plate (12) and the second fixed plate (22) are fixed to be connected It connects the pedal (11), connecting plate (15) is by attachment base (18) connection steering yoke (16), before the lower end of steering yoke (16) passes through Pitch (19) pivot joint wheel (20).

13. scooter as claimed in claim 12, which is characterized in that steering yoke is fixedly connected with a positioning seat on (16) (17), positioning seat (17) is in the top position of attachment base (18), outwardly protrudes that be provided at least two fixed on positioning seat (17) Position portion (171).

14. scooter as claimed in claim 12, which is characterized in that on attachment base (18), there are two symmetrical engaging lugs for tool (181), connecting plate (15) is fixedly connected on the outside of engaging lug (181), and the second connecting rod (14) is articulated in two companies The inside of lug (181).