阅读说明：本技术 一种拉杆驱动结构及含有其的双极绝缘手术钳机构 (Pull rod driving structure and bipolar insulation surgical forceps mechanism comprising same ) 是由 谢年 朱铖 韩屹立 翟晓峰 马广军 马骥 于 2021-11-11 设计创作，主要内容包括：本发明涉及医疗器械技术领域,特别涉及一种拉杆驱动结构,包括固定手柄和活动手柄,固定手柄上滑动设有拉杆,固定手柄上设有沿拉杆的轴向方向滑动的滑块,滑块与活动手柄之间设有连杆组件,滑块连接有用于拉动或释放拉杆的摆动件,摆动件的转动中心轴与拉杆的轴向垂直,本发明的拉杆驱动结构保证了拉杆的直线运动,减小拉杆的磨损。(The invention relates to the technical field of medical instruments, in particular to a pull rod driving structure which comprises a fixed handle and a movable handle, wherein a pull rod is arranged on the fixed handle in a sliding mode, a sliding block which slides along the axial direction of the pull rod is arranged on the fixed handle, a connecting rod assembly is arranged between the sliding block and the movable handle, the sliding block is connected with a swinging piece used for pulling or releasing the pull rod, and the rotating central shaft of the swinging piece is perpendicular to the axial direction of the pull rod.)

1. The pull rod driving structure is characterized by comprising a fixed handle (10) and a movable handle (20), wherein a pull rod (6) is arranged on the fixed handle (10) in a sliding mode, a sliding block (30) which slides along the axial direction of the pull rod (6) is arranged on the fixed handle (10), a connecting rod assembly (40) is arranged between the sliding block (30) and the movable handle (20), the sliding block (30) is connected with a swinging piece (50) used for pulling or releasing the pull rod (6), and the rotating central shaft of the swinging piece (50) is perpendicular to the axial direction of the pull rod (6).

2. A drawbar drive configuration according to claim 1, characterized in that: the swinging piece (50) is provided with a clamping groove (51), when the sliding block (30) moves towards the direction far away from the pull rod (6), the swinging piece (50) swings to enable the clamping groove (51) to clamp the convex part (61) at the end part of the pull rod (6), a return spring is connected between the sliding block (30) and the fixed handle (10), and after the sliding block (30) returns, the convex part (61) is separated from the clamping groove (51).

3. A drawbar drive configuration according to claim 1, characterized in that: the swing piece (50) is rotatably connected with the sliding block (30), and a driving mechanism for driving the swing piece (50) to swing in the sliding process of the sliding block (30) is further arranged in the fixed handle (10).

4. A drawbar drive configuration according to claim 3, characterized in that: the driving mechanism comprises a guide block (60) fixedly connected to the fixed handle (10), a wedge surface (61) used for enabling the swinging piece (50) to swing towards the direction close to the pull rod (6) while sliding along the sliding block (30) is arranged on the guide block (60), and a spring enabling the swinging piece (50) to reset is arranged between the swinging piece (50) and the sliding block (30).

5. A drawbar drive configuration according to claim 1, characterized in that: the connecting rod assembly (40) comprises a first connecting rod (401) and a second connecting rod (402), one end of the first connecting rod (401) is hinged to the fixed handle (10), the other end of the first connecting rod (401) is hinged to the movable handle (20), one end of the second connecting rod (402) is hinged to the first connecting rod (401), the second end of the second connecting rod (402) is hinged to the sliding block (30), and the first connecting rod (401) is in contact with the sliding block (30) and transmits with the sliding block (30).

6. A drawbar drive configuration according to claim 1, characterized in that: the slide block (30) is fixed with a supporting seat (70) for supporting the pull rod (6) towards the direction of the swinging piece (50).

7. A drawbar drive configuration according to claim 1, characterized in that: the sliding block (30) is provided with a plurality of guide posts (31), and the fixed handle (10) is provided with guide grooves (101) matched with the guide posts (31).

8. A bipolar insulated surgical clamp mechanism, comprising: the pull rod driving structure comprises the pull rod driving structure according to any one of claims 1 to 7, and further comprises a bipolar insulating tong head and a pipe fitting (5) connected with a fixed handle (10), wherein the pull rod (6) is movably arranged in the pipe fitting (5), the bipolar insulating tong head comprises a first tong head (1) and a second tong head (2), an insulating assembly is arranged between the first tong head (1) and the second tong head (2), the insulating assembly comprises a first insulating part (3) and a second insulating part (4) which are fixedly connected, a through hole (31) used for being rotatably connected with the second tong head (2) is formed in the first insulating part (3), the first insulating part (3) and the second insulating part (4) are matched to partially wrap the first tong head (1), and a first accommodating groove (32) used for accommodating the second insulating part (4) is formed in the first insulating part (3), the terminal surface of second insulating part (4) towards first insulating part (3) be equipped with second holding tank (41) that is used for packing into first binding clip (1), the shape and the first binding clip (1) of second holding tank (41) match, the degree of depth of first holding tank (32) along the axial setting of through-hole (31), second insulating part (4) and first binding clip (1) all contradict with the tank bottom of first holding tank (32) of first insulating part (3), first binding clip (1) have first landing leg (11) and second landing leg (12), second landing leg (12) and first landing leg (11) be located the both sides of through-hole (31) respectively, pull rod (6) articulated with first binding clip (1), pipe fitting (5) first end install pincers seat (7), second binding clip (2) articulated with seat (7), the second end of pipe fitting (5) be equipped with and be used for carrying out insulating cover to first pull rod (6) of guide 8) And a second insulating sleeve (9) used for limiting the pull rod (6) is arranged on the clamp seat (7).

9. A bipolar insulating forceps mechanism as claimed in claim 8, wherein: the inner diameter of the second insulating sleeve (9) is larger than that of the pull rod (6), and the inner diameter of the second insulating sleeve (9) is smaller than that of the forceps holder (7).

10. A bipolar insulating forceps mechanism as claimed in claim 8, wherein: first binding clip (1) and second binding clip (2) on have the tooth portion that is used for cliping the tissue and the pincers point that is used for cutting the tissue, first binding clip (1) and second binding clip (2) are equipped with the insulating layer except tooth portion and the other positions of pincers point, the insulating layer be the dull polish insulating layer, pull rod (6) on be equipped with the plastic-coated layer, the plastic-coated layer extend to the articulated position that is close to pull rod (6) and first binding clip (1).

Technical Field

The invention relates to the technical field of medical instruments, in particular to a pull rod driving structure and a bipolar insulation surgical forceps mechanism comprising the same.

Background

The prior art of the pull rod driving structure generally has no guiding function, such as a clip applier for endoscopic surgery disclosed in patent application No. 201320297853.7, the movement range of the pull rod is driven and adjusted by an adjusting screw, and the pull rod is easy to deflect or wear without the limitation of the driving structure, which affects the service life.

Disclosure of Invention

In order to solve the problem that a pull rod is easy to wear in the prior art, the invention provides a pull rod driving structure with a guiding function and a bipolar insulating tong head assembly.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a pull rod driving structure comprises a fixed handle and a movable handle, wherein a pull rod is arranged on the fixed handle in a sliding mode, a sliding block which slides along the axial direction of the pull rod is arranged on the fixed handle, a connecting rod assembly is arranged between the sliding block and the movable handle, the sliding block is connected with a swinging piece used for pulling or releasing the pull rod, and the rotating central shaft of the swinging piece is perpendicular to the axial direction of the pull rod.

Furthermore, a clamping groove is formed in the swinging piece, when the sliding block moves towards the direction far away from the pull rod, the swinging piece swings to enable the clamping groove to clamp the convex part at the end part of the pull rod, a return spring is connected between the sliding block and the fixed handle, and after the sliding block is reset, the convex part is separated from the clamping groove.

Furthermore, the swinging piece is rotatably connected with the sliding block, and a driving mechanism for driving the swinging piece to swing in the sliding process of the sliding block is also arranged in the fixed handle.

Furthermore, the driving mechanism comprises a guide block fixedly connected to the fixed handle, a wedge surface used for driving the swinging piece to swing towards the direction close to the pull rod is arranged on the guide block, and a spring used for enabling the swinging piece to reset is arranged between the swinging piece and the sliding block.

Furthermore, the connecting rod assembly comprises a first connecting rod and a second connecting rod, one end of the first connecting rod is hinged to the fixed handle, the other end of the first connecting rod is hinged to the movable handle, one end of the second connecting rod is hinged to the first connecting rod, the second end of the second connecting rod is hinged to the sliding block, and the first connecting rod is in contact with the sliding block and is in transmission with the sliding block.

Furthermore, the sliding block is provided with a plurality of guide posts, and the fixed handle is provided with guide grooves matched with the guide posts.

Furthermore, a supporting seat for supporting the pull rod towards the direction of the swinging piece is fixed on the sliding block.

A bipolar insulation surgical forceps mechanism comprises the pull rod driving structure, and further comprises a bipolar insulation forceps head and a pipe fitting connected with a fixed handle, wherein the pull rod is movably arranged in the pipe fitting, the bipolar insulation forceps head comprises a first forceps head and a second forceps head, an insulation assembly is arranged between the first forceps head and the second forceps head, the insulation assembly comprises a first insulation part and a second insulation part which are fixedly connected, the first insulation part is provided with a through hole used for being rotationally connected with the second forceps head, the first insulation part and the second insulation part are matched to wrap the first forceps head part, the first insulation part is provided with a first accommodating groove used for accommodating the second insulation part, the end face, facing the first insulation part, of the second insulation part is provided with a second accommodating groove used for accommodating the first forceps head, the shape of the second accommodating groove is matched with that of the first forceps head, the depth of the first accommodating groove is arranged along the axial direction of the through hole, second insulating part and first binding clip all contradict with the tank bottom of the first holding tank of first insulating part, first binding clip have first landing leg and second landing leg, second landing leg and first landing leg be located the both sides of through-hole respectively, the pull rod articulated with first binding clip, the first end of pipe fitting install the pincers seat, second binding clip articulated with the pincers seat, the second end of pipe fitting be equipped with and be used for carrying out the first insulation cover that leads to the pull rod, the pincers seat on be equipped with and be used for carrying out spacing second insulation cover to the pull rod.

Furthermore, the inner diameter of the second insulating sleeve is larger than that of the pull rod, and the inner diameter of the second insulating sleeve is smaller than that of the clamp seat.

Furthermore, first binding clip and second binding clip on have and be used for cliping the tooth portion of tissue and the pincers point that is used for cutting the tissue, first binding clip and second binding clip are equipped with the insulating layer except that tooth portion and the other positions of pincers point, the insulating layer be the dull polish insulating layer, the pull rod on be equipped with the package and mould the layer, the package mould the layer and extend to the articulated position that is close to pull rod and first binding clip.

Has the advantages that:

(1) the pull rod driving structure ensures the linear motion of the pull rod and reduces the abrasion of the pull rod;

(2) in the bipolar insulation surgical forceps mechanism, the structure of the swinging piece and the supporting seat of the pull rod driving structure ensures that the pull rod moves along a straight line, and reduces the contact probability between the pull rod and the forceps seat in the aspect of motion; in addition, the inner diameter of a second insulating sleeve between the pipe fitting and the pull rod is larger than that of the pull rod, and the inner diameter of the second insulating sleeve is smaller than that of the clamp seat, so that the pull rod cannot be in contact with the clamp seat, the pull rod is prevented from rubbing the clamp seat after swinging, even a plastic coating is worn away to cause breakdown, and the isolation between the pull rod and the clamp seat is ensured on the physical structure, so that a better isolation effect is ensured; moreover, the inner diameter of the second insulating sleeve is larger than that of the pull rod, and the inner diameter of the second insulating sleeve is smaller than that of the clamp seat, so that the pull rod is prevented from being positioned, and the smooth motion of the pull rod is ensured;

(3) the insulating part is adopted to realize the insulation of the two tong heads, the insulating part has the advantages of high hardness, high wear resistance, high adhesive force, high temperature resistance, high insulating property, long service life and the like, the insulating sleeve is arranged between the pull rod and the pipe fitting, the plastic coating layer is arranged on the pull rod, the withstand voltage value between the two tong heads can reach 1800V, and the insulating part is safe and reliable;

(4) a plurality of guide posts and guide grooves are arranged between the sliding block and the fixed handle, so that the movement precision of the sliding block is ensured.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

Fig. 1 is a front view of a drawbar drive structure according to embodiment 1 of the present invention;

fig. 2 is a first perspective view of a drawbar drive configuration according to embodiment 1 of the present invention;

fig. 3 is a second perspective view of the drawbar drive structure according to embodiment 1 of the present invention;

FIG. 4 is a block diagram of the first handle;

FIG. 5 is a block diagram of a second handle;

FIG. 6 is an assembled perspective view of the first jaw, the first insulator and the second insulator 1;

FIG. 7 is an assembled perspective view of the first jaw, the first insulator, and the second insulator 2;

FIG. 8 is an assembled front view of the first jaw, the first insulator and the second insulator;

FIG. 9 is a cross-sectional view taken along A-A of FIG. 8;

FIG. 10 is a cross-sectional view taken along line C-C of FIG. 8;

FIG. 11 is a block diagram of the first binding clip;

FIG. 12 is another view of the first jaw;

figure 13 is a front cross-sectional view of the overall construction of the bipolar insulation assembly;

FIG. 14 is an enlarged view of a portion of FIG. 13 at B;

FIG. 15 is a side view of the overall construction of the bipolar insulation assembly;

figure 16 is a front partial cross-sectional view of the overall construction of the bipolar insulation assembly;

fig. 17 is a perspective view of a drawbar drive structure according to embodiment 2 of the present invention.

The clamp comprises a clamp head 1, a first clamp head 11, a first support leg 12, a second support leg 2, a second clamp head 3, a first insulating part 31, a through hole 32, a first accommodating groove 4, a second insulating part 41, a second accommodating groove 5, a pipe 6, a pull rod 61, a convex part 7, a clamp seat 8, a first insulating sleeve 9, a second insulating sleeve 10, a fixed handle 101, a guide groove 102, a first handle 103, a second handle 20, a movable handle 30, a sliding block 31, a guide column 40, a connecting rod assembly 401, a first connecting rod 402, a second connecting rod 50, a swinging part 51, a clamping groove 60, a guide block 61, a wedge surface 70 and a supporting seat.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

Example 1:

referring to fig. 1 to 5, the pull rod driving structure of the present invention includes a fixed handle 10 and a movable handle 20, the fixed handle 10 is formed by splicing a first side handle 102 and a second side handle 103, a pull rod 6 is slidably disposed on the fixed handle 10, a slider 30 that slides along an axial direction of the pull rod 6 is disposed on the fixed handle 10, a link assembly 40 is disposed between the slider 30 and the movable handle 20, the slider 30 is connected to a swinging member 50 for pulling or releasing the pull rod 6, and a rotation center axis of the swinging member 50 is perpendicular to an axial direction of the pull rod 6.

The swinging piece 50 is provided with a clamping groove 51, when the sliding block 30 moves towards the direction far away from the pull rod 6, the swinging piece 50 swings so that the clamping groove 51 clamps the convex part 61 at the end part of the pull rod 6, a return spring is connected between the sliding block 30 and the fixed handle 10, and after the sliding block 30 returns, the convex part 61 is separated from the clamping groove 51. In the present invention, the convex portion 61 is a spherical convex portion.

The swinging piece 50 is rotatably connected with the sliding block 30, and a driving mechanism for driving the swinging piece 50 to swing in the sliding process of the sliding block 30 is also arranged in the fixed handle 10. The driving mechanism can be in a self-driving mode (such as motor driving and the like), the driving mechanism is in a mechanical mode, the driving mechanism comprises a guide block 60 fixedly connected to the fixed handle 10, a wedge surface 61 for promoting the swinging piece 50 to swing towards the direction close to the pull rod 6 while sliding along with the sliding block 30 is arranged on the guide block 60, and a spring for restoring the swinging piece 50 is arranged between the swinging piece 50 and the sliding block 30.

The connecting rod assembly 40 comprises a first connecting rod 401 and a second connecting rod 402, one end of the first connecting rod 401 is hinged on the fixed handle 10, the other end of the first connecting rod 401 is hinged on the movable handle 20, one end of the second connecting rod 402 is hinged on the first connecting rod 401, the second end of the second connecting rod 402 is hinged on the sliding block 30, and the first connecting rod 401 is in contact with the sliding block 30 and is in transmission with the sliding block 30. In order to enable the transmission of the two to be smooth, one side of the sliding block 30 is provided with a groove, the first connecting rod 401 is arranged in the groove of the sliding block 30, when the movable handle 20 is held, the first connecting rod 401 drives the sliding block 30 to slide, when the movable handle 20 is released, the return spring of the sliding block 30 enables the sliding block 30 to return, and the sliding block 30 drives the first connecting rod 401 to return.

A support 70 for supporting the pull rod 6 toward the swinging member 50 is fixed to the slider 30. Supporting seat 70 can be for flexible support column, is equipped with the spring between support column and the slider 30 promptly, and when pull rod 6 inserted, the convex part 61 of pull rod 6 made the support column shrink, and pull rod 6 continues to insert, and the support column stretches out the top on the member bar that is little than the convex part size at the convex part 61 rear of pull rod 6 to hold pull rod 6 from the below, prevent that it from rocking, with the cooperation of swinging member 50, together spacing with the pull rod, prevent that pull rod 6 from taking off.

The slider 30 is provided with a plurality of guide posts 31, the fixed handle 10 is provided with guide grooves 101 matched with the guide posts 31, the fixed handle 10 is formed by fixedly splicing a first handle 102 and a second handle 103, and the first handle 102 and the second handle 103 are both provided with the guide grooves 101. And a plurality of guide posts 31 are not in a straight line, wherein one guide post 31 simultaneously serves as a hinge joint of the swinging piece 50, so that the structure is more integrated.

The invention also provides a bipolar insulating surgical forceps mechanism which comprises the pull rod driving structure, as shown in fig. 6-16, and further comprises a bipolar insulating forceps head and a pipe fitting 5 connected with a fixed handle 10, wherein the pipe fitting 5 comprises a mounting sleeve and a steel pipe, the pull rod 6 is movably arranged in the pipe fitting 5, the bipolar insulating forceps head comprises a first forceps head 1 and a second forceps head 2, an insulating assembly is arranged between the first forceps head 1 and the second forceps head 2, and comprises a first insulating part 3 and a second insulating part 4. The first insulating part 3 is provided with a through hole 31 which is used for being rotationally connected with the second binding clip 2, the first insulating part 3 and the second insulating part 4 are matched to partially wrap the first binding clip 1, the first insulating part 3 is provided with a first accommodating groove 32 which is used for accommodating the second insulating part 4, the end surface of the second insulating part 4 facing the first insulating part 3 is provided with a second accommodating groove 41 which is used for accommodating the first binding clip 1, the shape of the second accommodating groove 41 is matched with that of the first binding clip 1, the depth of the first accommodating groove 32 is arranged along the axial direction of the through hole 31, the second insulating part 4 and the first binding clip 1 are both abutted against the groove bottom of the first accommodating groove 32 of the first insulating part 3, the first binding clip 1 is provided with a first supporting leg 11 and a second supporting leg 12, the second supporting leg 12 and the first supporting leg 11 are respectively positioned at two sides of the through hole 31, the pull rod 6 is hinged with the first binding clip 1, the first end of the pipe fitting 5 is provided with a binding clip 7, the pipe fitting 7 can be fixed with a steel pipe thread of the pipe fitting 5, the second binding clip 2 is articulated with the pincers seat 7, and the second end of pipe fitting 5 is equipped with and is used for carrying out the first insulating cover 8 that leads to pull rod 6, is equipped with on the pincers seat 7 to be used for carrying out spacing second insulating cover 9 to pull rod 6, and pipe fitting 5 and pincers seat surface need insulating spraying or parcel insulating material.

The inner diameter of the second insulating sleeve 9 is larger than that of the pull rod 6, and the inner diameter of the second insulating sleeve 9 is smaller than that of the caliper seat 7.

Have the tooth portion that is used for cliping the tissue on first binding clip 1 and the second binding clip 2 and be used for cutting the pincers point of tissue, first binding clip 1 is equipped with the insulating layer with the other positions of pincers point except tooth portion with second binding clip 2, and the insulating layer is the dull polish insulating layer, is equipped with the package on pull rod 6 and moulds the layer, and the package is moulded the layer and is extended to the articulated position that is close to pull rod 6 and first binding clip 1.

The oscillating piece 50 can have other ways than the structure of embodiment 1, such as: the swinging member 50 is rotatably connected to the fixed handle 10, and the swinging member 50 is in transmission connection with the sliding block 30, which is illustrated by two specific embodiments:

example 2:

the swing member 50 of this embodiment is rotatably connected to the fixed handle 10, and the swing member 50 is connected to the slider 30 through an intermediate link, specifically, the swing member 50 is hinged to the intermediate link, and the intermediate link is hinged to the slider 30, so that when the slider 30 slides, the swing member 50 is driven to rotate so as to buckle the protrusion 61 of the pull rod 6, the swing member 50 may also take the form of a notch as in embodiment 1, when the swing member 50 rotates, the notch catches the protrusion 61 of the pull rod 6, and then pulls the pull rod 6, because the protrusion 61 has a certain size, when the rotation angle of the swing member 50 is small, the notch will not be disengaged from the protrusion 61, the slider 30 is reset by the reset spring, the slider 30 drives the swing member 50 to rotate reversely until the pull rod 6 is disengaged from the notch, the slider 30 of this embodiment has a smaller size than the slider 30 of embodiment 1 because it is to avoid the intermediate link, the other structure of this embodiment is the same as embodiment 1.

Example 3:

the swing member 50 of this embodiment is rotatably connected to the fixed handle 10, and the swing member 50 is drivingly connected to the slider 30 by means of tooth engagement or the like, as in embodiment 2.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical scope of the present invention and the equivalent alternatives or modifications according to the technical solution and the inventive concept of the present invention within the technical scope of the present invention.