Alternating self-locking type force transmission mechanism

Abstract

The utility model belongs to the technical field of medical equipment, and provides an alternate self-locking type force transmission mechanism which comprises a fixing assembly, and the fixing assembly is provided with a reset assembly, a feeding assembly, a non-return assembly, a loosening assembly, a handle assembly and a push rod. The feeding assembly and the non-return assembly are provided with a feeding enclasping part and a non-return enclasping part which have elasticity, the push rod is enclasped or loosened by adjusting the feeding enclasping part and the non-return enclasping part to be in a compressed state or a loosened state, then the handle assembly and the push rod are in linkage movement or the effect of locking the push rod is achieved through the handle assembly, and accurate control over the injection amount is facilitated; and the push rod can return to the initial position in cooperation with the loosening assembly and the reset assembly. According to the device, the working pressure of an operator can be relieved, the working efficiency in an operation is improved, and the operation quality is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of medical instrument equipment, and specifically relates to an alternating self-locking force transmission mechanism. BACKGROUND

[0002] Artificial joint replacement can relieve joint pain and improve joint function. In artificial joint replacement, bone cement is used to fix the bone prosthesis, and the injection amount of bone cement needs to be accurately controlled. Improper injection amount can cause various adverse reactions. If the bone cement injection amount is too small, the support effect on the vertebral body is poor, and the vertebral body has the risk of collapsing again. If the bone cement injection amount is too large, it is easy to cause overflow, causing compression to the surrounding nerve tissue, blood vessels and other tissues, and causing nerve damage or blood vessel embolism and other serious consequences. Since the bone cement is a kind of dough-like fluid, a large extrusion force needs to be applied to inject the bone cement from the container to the surgical site. The conventional extrusion device is laborious and difficult to extrude. When extruding bone cement with high viscosity, the handle usually needs to be operated with both hands. The operator is difficult to control the injection amount and prolongs the operation time. Therefore, it is urgent to design a force transmission mechanism which is labor-saving, time-saving, convenient, stable and reliable, and has large extrusion force. SUMMARY

[0003] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the utility model is to provide an alternating self-locking force transmission mechanism.

[0004] The technical scheme adopted by the utility model to solve its technical problems is:

[0005] An alternating self-locking force transmission mechanism, comprising a fixed component, the fixed component is provided with a reset component, a feeding component, a check valve component, a loosening component, a handle component and a push rod;

[0006] The reset component is provided with an elastic reset part, and one end of the reset component is provided with the fixed component;

[0007] The feeding component is provided with a feeding clamping part, and the check valve component is provided with a check valve clamping part;

[0008] The handle component is provided with a handle driving part capable of moving one end or the other end of the feeding component relative to the fixed component;

[0009] During the movement of one end of the feeding component relative to the fixed component, the reset part is in a compressed state, the feeding clamping part is in a radial tight state and abuts against the push rod, and the check valve clamping part is in a relaxed state and is separated from the push rod;

[0010] The feeding assembly is in a relaxed state and separated from the push rod when moving in the direction of the other end of the fixed assembly, and the check assembly is in a radial contraction state and in abutting engagement with the push rod;

[0011] The loosening assembly is arranged at the other end of the fixed assembly, and the loosening assembly has a loosening driving part capable of enabling the feeding assembly and the check assembly to be in a compressed state or a relaxed state.

[0012] Preferably, the fixed assembly comprises a fixed seat and a clamp joint arranged at one end of the fixed seat, the feeding assembly and the check assembly are arranged in the cavity of the fixed seat, the handle assembly is connected to the fixed seat, the loosening assembly is arranged at the other end of the fixed seat, and the push rod penetrates the cavity of the fixed seat.

[0013] Preferably, the loosening assembly comprises a loosening handle assembly and a first fixing pin, the first fixing pin is arranged in the fixed seat, the loosening handle assembly is coaxially arranged with the push rod and in sliding engagement, a misaligned groove is arranged on the loosening handle assembly, one end of the first fixing pin is in sliding engagement with the misaligned groove, and the loosening handle assembly is the loosening driving part.

[0014] Preferably, the reset assembly comprises a reset spring seat, a reset spring part and a reset movable sleeve, the reset spring seat is fixed at one end of the fixed seat, the reset movable sleeve is arranged in the cavity of the fixed seat, the reset spring part is arranged between the reset spring seat and the reset movable sleeve, and the reset spring part and the reset movable sleeve form the reset part.

[0015] Preferably, the feeding assembly comprises a feeding assembly spring seat, a feeding locking spring part, a feeding locking inner sleeve, a feeding clamping ring, a feeding conical sleeve, a feeding unlocking inner sleeve and a feeding assembly outer sleeve which are sequentially sleeved on the push rod in the extension direction of the push rod.

[0016] The feeding clamping ring is a conical structure comprising three feeding clamping blocks, the feeding clamping blocks form the feeding clamping part, the inner wall surface of the feeding clamping part is provided with a first boss, the push rod is provided with a first groove, the first boss of the feeding clamping part is matched with the first groove of the push rod when the feeding clamping part is in a compressed state, thereby realizing the abutting engagement of the feeding clamping part with the push rod, and the feeding conical sleeve is provided with a conical surface matched with the feeding clamping ring.

[0017] Preferably, the check assembly comprises a check assembly spring seat, a check locking spring part, a check locking inner sleeve, a check clamping ring, a check conical sleeve, a check unlocking inner sleeve and a check assembly outer sleeve which are sequentially sleeved on the push rod in the extension direction of the push rod.

[0018] The check embrace ring is a conical structure, comprising three check embrace blocks, the three check embrace blocks form the check embrace part, the inner wall surface of the check embrace part is provided with a second boss, the push rod is provided with a second groove, when the check embrace part is in a compressed state, the second boss of the check embrace part is matched with the second groove of the push rod, the check embrace part and the push rod are abutted and matched, the check conical sleeve is provided with a conical surface matched with the check embrace ring.

[0019] The fixing seat is internally provided with a snap ring, the snap ring is arranged between the feeding assembly and the check assembly.

[0020] Preferably, the handle assembly comprises a handle sleeve, a fixed handle, a front connecting rod, a rear connecting rod and a movable handle, the handle sleeve is sleeved on the fixing seat, the fixed handle is connected with the handle sleeve, the top of the front connecting rod and the rear connecting rod is hinged with the fixed handle, and the bottom of the front connecting rod and the rear connecting rod is hinged with the movable handle.

[0021] The top of the rear connecting rod is provided with a connecting rod boss, and the connecting rod boss is the handle driving part.

[0022] Preferably, the fixing seat is provided with a through hole through which the connecting rod boss passes, and the through hole is communicated with the cavity of the fixing seat.

[0023] Compared with the prior art, the beneficial effects of the utility model include:

[0024] The alternating self-locking force transmission mechanism of the application is applied to a device for injecting bone cement, the feeding assembly and the check assembly provided with the feeding embrace part and the check embrace part have elasticity, the feeding embrace part and the check embrace part are adjusted to be in a compressed state or a relaxed state, the push rod is embraced or released, the handle assembly is used to realize the effect of moving together with the push rod or locking the push rod, which is beneficial to accurately control the injection amount; the push rod can be retreated to the initial position by cooperating with the loosening assembly and the resetting assembly. The application can reduce the working pressure of the operator, improve the working efficiency during the operation and improve the operation quality. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical scheme of the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0026] Figure 1 It is a cross-sectional structure schematic view of the application.

[0027] Figure 2 It is the internal partial section schematic view of the utility model.

[0028] Figure 3 It is the structure exploded schematic view of the utility model.

[0029] Figure 4 It is the structure schematic view of the loosening handle component of the utility model.

[0030] Among them:

[0031] 1-fixed assembly, 101-fixed seat, 102-hoop joint, 103-through hole, 104-clamp ring;

[0032] 2-reset assembly, 201-reset spring seat, 202-reset spring piece, 203-reset movable sleeve;

[0033] 3-feeding assembly, 301-feeding assembly spring seat, 302-feeding locking spring piece, 303-feeding locking inner sleeve, 304-feeding clamping ring, 305-feeding conical sleeve, 306-feeding unlocking inner sleeve, 307-feeding assembly outer sleeve;

[0034] 4-backstop assembly, 401-backstop assembly spring seat, 402-backstop locking spring piece, 403-backstop locking inner sleeve, 404-backstop clamping ring, 405-backstop conical sleeve, 406-backstop unlocking inner sleeve, 407-backstop assembly outer sleeve;

[0035] 5-loosening assembly, 501-loosening handle component, 502-first fixed pin, 503-misaligned groove;

[0036] 6-handle assembly, 601-handle sleeve, 602-fixed handle, 603-front connecting rod, 604-rear connecting rod, 605-movable handle, 606-connecting rod boss;

[0037] 7-push rod, 701-first groove, 702-second groove. DETAILED DESCRIPTION

[0038] In order to more clearly understand the above purpose, features and advantages of the utility model, the utility model is described in detail below in combination with the drawings and specific embodiments. It should be noted that the embodiments and the features in the embodiments of the present application can be combined with each other without conflict. In the following description, a lot of specific details are described so as to fully understand the utility model, and the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the utility model.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application.

[0040] Embodiment:

[0041] As shown in the embodiment, an alternating self-locking force transmission mechanism is provided, comprising a fixed assembly 1, the fixed assembly 1 being provided with a reset assembly 2, a feeding assembly 3, a check valve assembly 4, a loosening assembly 5, a handle assembly 6 and a push rod 7; Figures 1-4 The reset assembly 2 is provided with an elastic reset part, and the reset assembly 2 is provided at one end of the fixed assembly 1;

[0042] The feeding assembly 3 is provided with a feeding clamping part, and the check valve assembly 4 is provided with a check valve clamping part;

[0043] The handle assembly 6 is provided with a handle driving part capable of moving the feeding assembly 3 relative to one end of the fixed assembly 1;

[0044] During movement of the feeding assembly 3 relative to one end of the fixed assembly 1, the reset part is in a compressed state, the feeding clamping part is in a radial tight state and abuts against the push rod 7, and the check valve clamping part is in a relaxed state and separated from the push rod 7;

[0045] During movement of the feeding assembly 3 relative to the other end of the fixed assembly 1, the feeding clamping part is in a relaxed state and separated from the push rod 7, and the check valve clamping part is in a radial tight state and abuts against the push rod 7;

[0046] The loosening assembly 5 is arranged at the other end of the fixed assembly 1, and the loosening assembly 5 has a loosening driving part capable of making the feeding clamping part and the check valve clamping part in a compressed state or a relaxed state.

[0047] The alternating self-locking force transmission mechanism of the embodiment is applied to a device for injecting bone cement, and the feeding assembly 3 and the check valve assembly 4 provided with the feeding clamping part and the check valve clamping part have elasticity. By adjusting the feeding clamping part and the check valve clamping part in a compressed state or a relaxed state, the push rod 7 is clamped or loosened, and then the handle assembly 6 is used to realize the effect of moving together with the push rod 7 or locking the push rod 7, which is beneficial to accurate control of the injection amount. The loosening assembly 5 and the reset assembly 2 can be used to realize the reset of the push rod 7 to the initial position. The embodiment can reduce the working pressure of the operator, improve the working efficiency during the operation, and improve the operation quality.

[0048] The specific structure of the fixed assembly 1 of the embodiment is as follows:

[0049]

[0050] ​The fixed assembly 1 comprises a fixed seat 101 and a clamp joint 102 provided at one end of the fixed seat 101, the feeding assembly 3 and the check assembly 4 are arranged in the cavity of the fixed seat 101, the handle assembly 6 is connected with the fixed seat 101, the loosening assembly 5 is arranged at the other end of the fixed seat 101, and the push rod 7 penetrates the cavity of the fixed seat 101.

[0051] The clamp joint 102 is used for connecting with the tail of a bone cement injection cylinder, and a flange face structure is arranged at the front end of the push rod 7 and used for pushing the piston in the injection cylinder.

[0052] The loosening assembly 5 of the embodiment has the following specific structure:

[0053] The loosening assembly 5 comprises a loosening handle assembly 501 and a first fixed pin 502, the first fixed pin 502 is arranged in the fixed seat 101, the loosening handle assembly 501 is coaxially arranged with the push rod 7 and is in sliding fit, a dislocation groove 503 is arranged on the loosening handle assembly 501, one end of the first fixed pin 502 is in sliding fit with the dislocation groove 503, and the loosening handle assembly 501 is a loosening driving part.

[0054] The reset assembly 2 of the embodiment has the following specific structure:

[0055] The reset assembly 2 comprises a reset spring seat 201, a reset spring part 202 and a reset movable sleeve 203, the reset spring seat 201 is fixed at one end of the fixed seat 101, the reset movable sleeve 203 is arranged in the cavity of the fixed seat 101, the reset spring part 202 is arranged between the reset spring seat 201 and the reset movable sleeve 203, and the reset spring part 202 and the reset movable sleeve 203 form a reset part.

[0056] In the above structure, the loosening handle assembly 501 moves relative to the push rod 7 through the cooperation structure of the dislocation groove 503 and the first fixed pin 502, when the loosening handle assembly 501 is rotated and moves to the front end of the push rod 7, the loosening handle assembly 501 releases the push rod 7 through the feeding assembly 3 and the check assembly 4, and the reset assembly 2 is in a squeezed state, at this time, the push rod 7 can move left and right under the external force, so that in the preparation stage before the bone cement injection, the bone cement cylindrical container can be installed on the clamp joint 102, the push rod 7 can be directly pushed to contact the piston in the container, and the bone cement injection is started from this position, so that the handle operation time can be effectively shortened; after the bone cement injection is completed, the push rod 7 can be easily pulled back to the initial position by holding the end of the push rod 7.

[0057] When the rotating release handle member 501 moves to the rear end of the push rod 7, the release handle member 501 is in contact with the action force between the feeding assembly 3 and the non-return assembly 4, at this time, the feeding assembly 3 and the non-return assembly 4 are restored to the state of holding the push rod 7 according to the elasticity, at this time, the push rod 7 is in a locked state, and the user cannot move the push rod 7 by directly applying an external force to the push rod 7.

[0058] The specific structure of the feeding assembly 3 of the embodiment is as follows:

[0059] The feeding assembly 3 comprises a feeding assembly spring seat 301, a feeding locking spring member 302, a feeding locking inner sleeve 303, a feeding holding ring 304, a feeding conical sleeve 305, a feeding unlocking inner sleeve 306 and a feeding assembly outer sleeve 307 which are sequentially sleeved on the push rod 7 along the extension direction of the push rod 7.

[0060] The feeding holding ring 304 is a conical structure and comprises three feeding holding blocks, and the three feeding holding blocks form a feeding holding part, the inner wall surface of the feeding holding part is provided with a first boss, the push rod 7 is provided with a first groove 701, and when the feeding holding part is in a compressed state, the first boss of the feeding holding part is matched with the first groove 701 of the push rod 7, so as to realize the abutting and matching of the feeding holding part and the push rod 7, and the feeding conical sleeve 305 is provided with a conical surface matched with the feeding holding ring 304.

[0061] The specific structure of the non-return assembly 4 of the embodiment is as follows:

[0062] The non-return assembly 4 comprises a non-return assembly spring seat 401, a non-return locking spring member 402, a non-return locking inner sleeve 403, a non-return holding ring 404, a non-return conical sleeve 405, a non-return unlocking inner sleeve 406 and a non-return assembly outer sleeve 407 which are sequentially sleeved on the push rod 7 along the extension direction of the push rod 7.

[0063] The non-return holding ring 404 is a conical structure and comprises three non-return holding blocks, and the three non-return holding blocks form a non-return holding part, the inner wall surface of the non-return holding part is provided with a second boss, the push rod 7 is provided with a second groove 702, and when the non-return holding part is in a compressed state, the second boss of the non-return holding part is matched with the second groove 702 of the push rod 7, so as to realize the abutting and matching of the non-return holding part and the push rod 7, and the non-return conical sleeve 405 is provided with a conical surface matched with the non-return holding ring 404.

[0064] The fixed seat 101 is provided with a clasp 104 between the feeding assembly 3 and the non-return assembly 4.

[0065] The specific structure of the handle assembly 6 of the embodiment is as follows:

[0066] The handle assembly 6 comprises a handle sleeve 601, a fixed handle 602, a front connecting rod 603, a rear connecting rod 604 and a movable handle 605, the handle sleeve 601 is sleeved on the fixed seat 101, the fixed handle 602 is connected with the handle sleeve 601, the top of the front connecting rod 603 and the rear connecting rod 604 is hinged with the fixed handle 602, and the bottom of the front connecting rod 603 and the rear connecting rod 604 is hinged with the movable handle 605.

[0067] The top of the rear connecting rod 604 is provided with a connecting rod boss 606, and the connecting rod boss 606 is a handle driving part.

[0068] Specifically, the fixed seat 101 is provided with a through hole 103 for the connecting rod boss to pass through, and the through hole 103 is communicated with the cavity of the fixed seat 101.

[0069] When the above loosening assembly 5 realizes that the push rod 7 is in the locked state, the operator can realize the movement of the push rod 7 through the handle assembly 6. Specifically, when the user holds the movable handle 605, the front connecting rod 603 and the rear connecting rod 604 rotate relative to the fixed handle 602, the connecting rod boss of the rear connecting rod 604 acts on the feeding assembly outer sleeve 307 to move in the direction of the front end of the push rod 7, thereby driving the feeding assembly 3 as a whole to move in the direction of the front end of the push rod 7. At this time, the feeding clamping ring 304 is in a compressed state and clamps the push rod 7 under the action of the spring force of the feeding locking spring member 302 and the taper surface extrusion force of the feeding taper sleeve 305. At this time, the push rod 7 provides a force to the check clamping ring 404 in the direction of the front end of the push rod 7, so that the check clamping ring 404 is separated from the taper surface of the check taper sleeve 405, and the feeding clamping part of the check clamping ring 404 returns to a relaxed state and does not have a clamping effect. Therefore, the push rod 7 moves to the left in the direction of the front end of the push rod 7 along with the feeding clamping ring 304.

[0070] If the movable handle 605 is loosened, the above-mentioned components are sequentially reset in the direction of the rear end of the push rod 7 by the reset spring. At this time, the check clamping ring 404 is compressed to clamp the push rod 7 under the action of the check locking spring member 402 and the taper surface of the check taper sleeve 405, and the push rod 7 cannot move to the right under the action of external force, thereby realizing the check effect. At the same time, the feeding assembly outer sleeve 307 is reset in the direction of the rear end of the push rod 7 under the action of the pushing force of the reset spring member 202, the taper surface of the feeding taper sleeve 305 does not extrude the feeding clamping ring 304, and the feeding clamping ring 304 is in a relaxed state. Therefore, the feeding clamping ring 304 can be reset in the direction of the rear end of the push rod 7 under the action of the pushing force of the feeding locking spring member 302 and the feeding locking inner sleeve 303 in the direction of the rear end of the push rod 7. The front connecting rod 603 and the rear connecting rod 604 are also reset along with the feeding assembly outer sleeve 307. According to the above steps, the movable handle 605 is gripped and loosened in a cycle, so that the push rod 7 can be continuously fed in the direction of the front end of the push rod 7 and cannot be returned in the direction of the rear end of the push rod 7.

[0071] In summary, the alternative self-locking force transmission mechanism of the embodiment is used in a bone cement injection device in joint replacement, has reasonable structure design, clear working principle, labor-saving operation, large output extrusion force, can stably feed and eliminate back-off during injection, and is beneficial to accurate control of injection amount. In specific operation, the front flange surface of the push rod 7 can be directly pushed to contact the piston according to the amount of bone cement filled in the container, so as to effectively shorten the handle operation time. After bone cement injection is completed, the push rod 7 can easily return to the initial position under the action of the loosening mechanism, without jamming phenomenon. The mechanism reduces the working pressure of the operator, improves the working efficiency in the operation, and improves the operation quality.

[0072] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Any modification, equivalent change and modification of the above embodiment according to the technical essence of the present application still belongs to the scope of the technical scheme of the present application.

Claims

1. An alternating self-locking force transmission mechanism, characterized in that It includes a fixed component, which is provided with a reset component, a feeding component, a check component, a loosening component, a handle component and a push rod; The reset component is provided with an elastic reset part, and one end of the reset component is provided with the fixed component; The feeding component is provided with a feeding clamping part, and the check component is provided with a check clamping part; The handle component is provided with a handle driving part which can drive one end of the feeding component to move relative to the fixed component; During the movement of one end of the feeding component relative to the fixed component, the reset part is in a compressed state, the feeding clamping part is in a radial tight state and is in abutting connection with the push rod, and the check clamping part is in a relaxed state and is separated from the push rod; During the movement of the other end of the feeding component relative to the fixed component, the feeding clamping part is in a relaxed state and is separated from the push rod, and the check clamping part is in a radial tight state and is in abutting connection with the push rod; The loosening component is arranged at the other end of the fixed component, and the loosening component has a loosening driving part which can make the feeding clamping part and the check clamping part be in a compressed state or a relaxed state.

2. The alternating self-locking force transmission according to claim 1, characterized in that The fixed component includes a fixed seat and a clamp type joint, the clamp type joint is arranged at one end of the fixed seat, the feeding component and the check component are arranged in the cavity of the fixed seat, the handle component is connected with the fixed seat, the loosening component is arranged at the other end of the fixed seat, and the push rod penetrates the cavity of the fixed seat.

3. The alternating self-locking force transmission according to claim 2, characterized in that The loosening component includes a loosening handle component and a first fixed pin, the first fixed pin is arranged at the fixed seat, the loosening handle component is coaxially arranged with the push rod and is in sliding connection, a dislocation groove is arranged on the loosening handle component, one end of the first fixed pin is in sliding connection with the dislocation groove, and the loosening handle component is the loosening driving part.

4. The alternating self-locking force transmission according to claim 2, characterized in that The reset component includes a reset spring seat, a reset spring and a reset movable sleeve, the reset spring seat is fixed at one end of the fixed seat, the reset movable sleeve is arranged in the cavity of the fixed seat, the reset spring is arranged between the reset spring seat and the reset movable sleeve, and the reset spring and the reset movable sleeve form the reset part.

5. The alternating self-locking force transfer mechanism of claim 2, wherein, The feeding component includes a feeding component spring seat, a feeding locking spring, a feeding locking inner sleeve, a feeding clamping ring, a feeding conical sleeve, a feeding unlocking inner sleeve and a feeding component outer sleeve which are sequentially sleeved on the push rod along the extension direction of the push rod; The feeding clamping ring is a conical structure and includes three feeding clamping blocks, the three feeding clamping blocks form the feeding clamping part, an inner wall surface of the feeding clamping part is provided with a first boss, a first groove is arranged on the push rod, when the feeding clamping part is in a compressed state, the first boss of the feeding clamping part is matched with the first groove of the push rod, the feeding clamping part and the push rod are in abutting connection, and the feeding conical sleeve is provided with a conical surface matched with the feeding clamping ring.

6. The alternating self-locking force transfer mechanism of claim 2, wherein, The check assembly comprises, in sequence along the extension direction of the push rod, a check assembly spring seat, a check locking spring piece, a check locking inner sleeve, a check embracing ring, a check conical sleeve, a check unlocking inner sleeve and a check assembly outer sleeve; The check embracing ring is a conical structure and comprises three check embracing blocks, and the three check embracing blocks form the check embracing part, and the inner wall surface of the check embracing part is provided with a second boss, and the push rod is provided with a second groove, and when the check embracing part is in a compressed state, the second boss of the check embracing part is matched with the second groove of the push rod, so that the check embracing part is abutted and matched with the push rod, and the check conical sleeve is provided with a conical surface matched with the check embracing ring; The fixing seat is internally provided with a snap ring, and the snap ring is arranged between the feeding assembly and the check assembly.

7. The alternating self-locking force transfer mechanism of claim 2, wherein, The handle assembly comprises a handle sleeve, a fixed handle, a front connecting rod, a rear connecting rod and a movable handle, the handle sleeve is sleeved on the fixing seat, the fixed handle is connected with the handle sleeve, the top of the front connecting rod and the rear connecting rod is hinged with the fixed handle, and the bottom of the front connecting rod and the rear connecting rod is hinged with the movable handle. The top of the rear connecting rod is provided with a connecting rod boss, and the connecting rod boss is the handle driving part.

8. The alternating self-locking force transmission according to claim 7, characterized in that The fixing seat is provided with a through hole through which the connecting rod boss passes, and the through hole is communicated with the cavity of the fixing seat. The fixing seat is provided with a through hole through which the connecting rod boss passes, and the through hole is communicated with the cavity of the fixing seat.

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