CN214129337U - Special seat of thorax puncture convenient to patient uses - Google Patents

Abstract

The utility model belongs to the technical field of the puncture auxiliary device, especially, a special seat of thorax puncture convenient to patient uses now proposes following scheme, comprising a base plate, top one side rigid coupling of bottom plate has the complementary unit who sets up rather than the slope, complementary unit includes the back board with bottom plate top rigid coupling, the mounting groove of setting up along its length direction is seted up to one side top that the back board is close to the bottom plate, the inside slide of mounting groove has cup jointed the activity backup plate, one side that the activity backup plate stretches out mounting groove top one end articulates there is the layer board, the holding tank of setting up along its length direction is seted up to the bottom of layer board. The utility model discloses this design can be according to height and the inclination of patient's height regulation layer board, makes things convenient for the patient to lie prone and puncture the operation on the layer board, improves the puncture and makes patient's comfort level, makes things convenient for medical personnel to puncture the operation simultaneously.

Description

Special seat of thorax puncture convenient to patient uses

Technical Field

The utility model relates to a puncture auxiliary device technical field especially relates to a special seat of thorax puncture convenient to patient uses.

Background

Thoracentesis refers to the operation of puncturing the skin, intercostal tissues, parietal pleura and entering the pleural cavity with a sterilized needle. In the clinical work of pneumology department, thoracentesis is a more common, convenient simple and easy diagnosis and treatment method again, when carrying out the puncture to the patient, sometimes need follow patient's back and carry out the puncture, the patient sits on the chair at this time, the hand is put and is punctured on the chair back, because the chair highly uniform, patient height is inconsistent, the patient is extremely uncomfortable when the puncture, inconvenient medical personnel carry out the puncture operation, need a thoracentesis special seat of patient's use of being convenient for this reason.

SUMMERY OF THE UTILITY MODEL

The utility model provides a special seat of thorax puncture convenient to patient uses has solved the problem that exists among the prior art.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a special chair for thoracentesis convenient for a patient to use, which comprises a bottom plate, wherein one side of the top of the bottom plate is fixedly connected with an auxiliary mechanism which is obliquely arranged with the bottom plate, the auxiliary mechanism comprises a backrest plate fixedly connected with the top of the bottom plate, a mounting groove arranged along the length direction of the backrest plate is arranged above one side of the backrest plate close to the bottom plate, a movable backup plate is sleeved on the inner slide way of the mounting groove, a supporting plate is hinged on one side of the movable backup plate extending out of one end of the top of the mounting groove, the bottom of the supporting plate is provided with a holding tank arranged along the length direction of the supporting plate, one end of the holding tank far away from the movable backup plate is rotationally connected with a telescopic mechanism, one end of the telescopic mechanism, which is far away from the supporting plate, is connected with a docking mechanism positioned on the backrest plate, one side of the docking mechanism, which is close to the backrest plate, is provided with a locking mechanism, and the bottom of the auxiliary mechanism is connected with a leg clamping mechanism fixedly connected with the bottom plate;

docking mechanism includes two sets of parallel arrangement and with the side shield of the L type structure of back board rigid coupling, and is two sets of one side that the side shield is close to each other begins to have along the guide way that its length direction set up, and is two sets of sliding connection has the stripper plate of U type structure between the guide way, the inside sliding connection of stripper plate has the regulating plate, the regulating plate screw thread cup joints the regulation pole of cup jointing with the stripper plate activity.

Preferably, telescopic machanism includes the sleeve pipe of being connected with the holding tank rotation, the sleeve pipe is kept away from the one end slip of holding tank and is cup jointed along its gliding movable tube of length direction, the inside slip of movable tube has cup jointed along its gliding push rod of length direction, the movable tube stretches into to sheathed tube one end rigid coupling has the apron, the apron is close to one side of movable tube and has offered two sets of spouts along its axis symmetric distribution, and the spout sets up along the diametric (al) direction of apron, spout sliding connection has the joint board, the one end rigid coupling that the joint board is close to the push rod has the butt piece of trapezium structure, the ejector pad of the round platform type structure with the push rod rigid coupling is installed to one side that two sets of butt pieces are close to each other, the butt joint hole that cup joints with the butt piece activity is seted up to the one end both sides that the movable tube is close to the apron.

Preferably, one side rigid coupling that the sleeve pipe one end was stretched out to the movable tube has the pivot that cup joints with the activity of stripper plate inside wall, and the one end rigid coupling that the push rod is close to the back board has the adapter plate that is located the semi-circular structure in the movable tube outside, and the outer convex surface rigid coupling of adapter plate has the rack of convex structure, through the mode joint of latch draw-in groove between rack and the regulating plate.

Preferably, the clamping grooves arranged along the length direction of the sleeve are formed in the two sides of the inner side wall of the sleeve, and the clamping grooves are clamped with the clamping plates in a clamping mode of clamping tooth clamping grooves.

Preferably, a first spring is fixedly connected between the pushing block and the cover plate, a second spring is fixedly connected to one side, far away from each other, of each of the two clamping plates, and the second spring is fixedly connected with the side wall of the end portion of the sliding groove.

Preferably, the locking mechanism comprises a channel which is positioned in the mounting groove and penetrates through the backboard, the locking board is sleeved on the inner slide way of the channel, and a third spring is fixedly connected between the locking board and the side baffle.

Preferably, the extrusion board is close to back board one side below and sets up the promotion groove that the slope set up, and the landing leg is installed to the bottom of bottom plate, and the holding tank is close to the inside wall of back board one end and sets up inside sunken convex standing groove.

Preferably, the leg clamping mechanism comprises an extension plate which is positioned at the bottom of the auxiliary mechanism and fixedly connected with the end part of the bottom plate, fixed clamping plates are fixedly connected with two sides of the extension plate adjacent to a point, one side of the extension plate, which is far away from the bottom plate, is provided with a sliding groove arranged along the length direction of the extension plate, the sliding groove is in sliding connection with two groups of first push plates with L-shaped structures symmetrically arranged along the middle position of the extension plate, one ends of the two groups of first push plates, which are far away from each other, are fixedly connected with movable clamping plates arranged in parallel with the fixed clamping plates, the two groups of movable clamping plates are positioned at one sides of the two groups of fixed clamping plates, the tops of the two groups of first push plates, which extend out of the sliding groove, are fixedly connected with second push plates with the L-shaped structures extending towards the upper part of the extension plate, push rods are fixedly connected with the tops of the two groups of first push plates, the same pull-back plate with the L-shaped structures in sliding sleeve joint with the side baffle is arranged at the tops of the two groups of the first push plates, and the pull plate is fixedly connected with the bottom part of the locking plate, the pull-back plate is clamped with the first push rod in a clamping manner of a clamping tooth clamping groove.

In the utility model, the water-saving device is provided with a water-saving valve,

through bottom plate, complementary unit, back board, mounting groove, activity backup plate, layer board, holding tank, telescopic machanism and the docking mechanism that sets up for this design can be according to height and the inclination of patient's height regulation layer board, makes things convenient for the patient to lie prone and punctures the operation on the layer board, improves the puncture and makes patient's comfort level, makes things convenient for medical personnel to puncture the operation simultaneously.

Drawings

Fig. 1 is a schematic structural view of a special thoracentesis chair convenient for a patient to use;

fig. 2 is a schematic structural view of a special seat auxiliary mechanism for thoracocentesis convenient for a patient to use;

fig. 3 is a schematic structural view of a docking mechanism of a special thoracic puncture seat convenient for a patient to use;

fig. 4 is a schematic structural view of a locally enlarged seat a for thoracocentesis convenient for a patient to use in the present invention;

fig. 5 is a schematic structural view of a locally enlarged seat B for thoracentesis convenient for a patient to use;

fig. 6 is a schematic structural view of a leg clamping mechanism of a thoracocentesis special seat convenient for a patient to use;

fig. 7 is a structural schematic diagram of the distribution of the first push plate, the movable splint and the second push plate of the special seat for thoracentesis convenient for a patient to use.

In the figure: the device comprises a base plate 1, an auxiliary mechanism 2, a backrest plate 3, a mounting groove 4, a movable backup plate 5, a supporting plate 6, a receiving groove 7, an expansion mechanism 8, a docking mechanism 9, a leg clamping mechanism 10, a channel 41, a locking plate 42, a sleeve 81, a movable tube 82, a push rod 83, a cover plate 84, a sliding groove 85, a clamping plate 86, a butting plate 87, a docking hole 88, a clamping groove 89, a push block 810, a rotating shaft 811, a switching plate 812, a side baffle 91, a guide groove 92, a pressing plate 93, an adjusting plate 94, an adjusting rod 95, an extension plate 10, a fixed clamping plate 102, a sliding groove 103, a first pushing plate 104, a movable clamping plate 105, a second pushing plate 106, a first pushing rod 107 and a pull-back plate 108.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Referring to fig. 1-7, a special chair for thoracentesis convenient for patients to use, which comprises a bottom plate 1, wherein one side of the top of the bottom plate 1 is fixedly connected with an auxiliary mechanism 2 obliquely arranged with the bottom plate, the auxiliary mechanism 2 comprises a back plate 3 fixedly connected with the top of the bottom plate 1, a mounting groove 4 arranged along the length direction of the back plate 3 is arranged above one side of the back plate 3 close to the bottom plate 1, an internal slideway of the mounting groove 4 is sleeved with a movable backup plate 5, one side of the movable backup plate 5 extending out of the top of the mounting groove 4 is hinged with a supporting plate 6, the bottom of the supporting plate 6 is provided with a holding tank 7 arranged along the length direction, one end of the holding tank 7 far away from the movable backup plate 5 is rotatably connected with a telescopic mechanism 8, one end of the telescopic mechanism 8 far away from the supporting plate 6 is connected with a butt joint mechanism 9 positioned on the back plate 3, a locking mechanism is arranged on one side of the docking mechanism 9 close to the backboard 3, and the bottom of the auxiliary mechanism 2 is connected with a leg clamping mechanism 10 fixedly connected with the bottom board 1;

further, docking mechanism 9 includes two sets of parallel arrangement and the side shield 91 of the L type structure of rigid coupling with backboard 3, and the one side that two sets of side shield 91 are close to each other begins to have a guide way 92 that sets up along its length direction, and sliding connection has the stripper plate 93 of U type structure between two sets of guide ways 92, and the inside sliding connection of stripper plate 93 has regulating plate 94, and regulating plate 94 threaded sleeve has the regulation pole 95 that cup joints with stripper plate 93 activity.

Specifically, telescopic machanism 8 includes the sleeve pipe 81 of being connected with holding tank 7 rotation, the sleeve pipe 81 is kept away from the one end slip cup joint of holding tank 7 and is followed its gliding movable tube 82 of length direction, the inside slip cup joint of movable tube 82 has along its gliding push rod 83 of length direction, movable tube 82 stretches into the one end rigid coupling of sleeve pipe 81 has apron 84, apron 84 is close to one side of movable tube 82 and has been seted up two sets of spout 85 along its axis symmetric distribution, and spout 85 sets up along the diameter direction of apron 84, spout 85 sliding connection has joint board 86, the one end rigid coupling that joint board 86 is close to push rod 83 has trapezoidal structure's butt piece 87, the ejector pad 810 of the round platform type structure with push rod 83 rigid coupling is installed to one side that two sets of butt piece 87 are close to each other, the butt joint hole 88 that cup joints with butt piece 87 activity is seted up to one end both sides that movable tube 82 is close to apron 84.

Particularly, a rotating shaft 811 movably sleeved with the inner side wall of the extrusion plate 93 is fixedly connected to one side of the movable tube 82 extending out of one end of the sleeve 81, an adapter plate 812 of a semicircular structure located outside the movable tube 82 is fixedly connected to one end of the push rod 83 close to the back plate 3, a rack of a circular arc structure is fixedly connected to the outer convex surface of the adapter plate 812, and the rack and the adjusting plate 94 are clamped in a clamping manner through a clamping groove of a clamping tooth.

It is worth to say that the clamping grooves 89 arranged along the length direction are formed in the two sides of the inner side wall of the sleeve 81, and the clamping grooves 89 are clamped with the clamping plates 86 in a manner of clamping tooth clamping grooves.

In addition, a first spring is fixedly connected between the pushing block 810 and the cover plate 84, a second spring is fixedly connected to the side of the two sets of clamping plates 86 away from each other, and the second spring is fixedly connected to the side wall of the end portion of the sliding groove 85.

Besides, the locking mechanism comprises a channel 41 which is positioned in the mounting groove 4 and penetrates through the backrest plate 3, a locking plate 42 is sleeved on an inner slide way of the channel 41, and a spring III is fixedly connected between the locking plate 42 and the side baffle 91.

Furthermore, a pushing groove is obliquely formed below one side of the extrusion plate 93 close to the backboard 3, the bottom of the bottom plate 1 is provided with a supporting leg, and the inner side wall of the accommodating groove 7 close to one end of the backboard 3 is provided with an inwardly concave arc-shaped accommodating groove.

To be supplemented, the leg clamping mechanism 10 includes an extension board 101 located at the bottom of the auxiliary mechanism 2 and fixedly connected to the end of the bottom board 1, fixed clamping boards 102 are fixedly connected to two sides of the extension board 101 adjacent to the point 1, a sliding groove 103 is formed in one side of the extension board 101 away from the bottom board 1 and arranged along the length direction of the extension board 101, two groups of first push boards 104 symmetrically arranged along the middle position of the extension board 101 are slidably connected to the sliding groove 103, movable clamping boards 105 arranged parallel to the fixed clamping boards 102 are fixedly connected to the ends of the two groups of first push boards 104 away from each other, two groups of movable clamping boards 105 are located at the sides of the two groups of fixed clamping boards 102 away from each other, two groups of push boards 106 extending out of the sliding groove 103 are fixedly connected to the tops of the ends of the two groups of first push boards 104 extending out of the sliding groove 103, two groups of push boards 106 extending towards the upper part of the extension board 101 are fixedly connected to the tops of the two groups of push boards 107, the same pull-back board 108 of the L-type structure slidably sleeved with the side baffle 91 is installed at the tops of the two groups of first push boards 107, one end of the pull-back plate 108 extending into the side baffle 91 is fixedly connected with the bottom of the locking plate 42, and the pull-back plate 108 is clamped with the first push rod 107 in a clamping manner of a clamping tooth clamping groove.

The working principle is as follows: when in use, the adapter plate 812 positioned in the accommodating groove 7 is pushed towards the direction of the sleeve 81, so that the adapter plate 812 is not clamped with the placing groove at the end part of the accommodating groove 7, then the movable tube 82 is deflected downwards, the telescopic mechanism 8 is pulled out from the containing groove 7, then the extrusion plate 93 on the butting mechanism 9 at the bottom of the movable tube 82 is pushed in from the guide groove 92 between the tops of the two groups of side baffles 91, the extrusion plate 93 is pushed downwards along the guide groove 92, meanwhile, the movable backup plate 5 positioned on the backup plate 3 is pushed along the length direction of the mounting groove 4, the position between the movable backup plate 5 and the backup plate 3 is adjusted, when the pressing plate 93 moves downward to press the locking plate 42, the locking plate 42 moves toward the movable backup plate 5, then the locking plate 42 is clamped with the movable backup plate 5 in a clamping manner through a clamping tooth clamping groove, and the movable backup plate 5 is fixed on the backup plate 3 at this time;

then the movable tube 82 is pushed to extend out of the sleeve 81, the inclined position of the support plate 6 is adjusted, the support plate 6 is moved to a proper position, then the adjusting rod 95 on the adjusting plate 94 is rotated and rotated, the adjusting plate 94 moves towards the direction of the movable tube 82 under the action of the thread, the adjusting plate 94 is firstly contacted with the adapter plate 812 on the push rod 83, then the adapter plate 812 is pushed towards the direction of the sleeve 81 along with the movement of the adjusting plate 94, the push rod 83 moves along with the adapter plate 812, the push block 810 drives the push block 810 to move when the push rod 83 moves, the push block 810 pushes the two groups of abutting plates 87 towards the positions far away from each other, the abutting plates 87 are clamped with the clamping grooves 89 on the sleeve 81, the sleeve 81 and the movable tube 82 are fixed, meanwhile, the adjusting plate 94 is clamped and fixed with the adapter plate 812, the fixing operation of the telescopic mechanism 8 is completed, then the patient sits on the top of the bottom plate 1, and places the hand on the top of the support plate 6, medical staff puncture the back of the patient;

meanwhile, when the auxiliary mechanism 2 is adjusted, before a patient sits on the bottom plate 1 in a reverse direction, the locking plate 42 moves towards the side baffle 91 under the action of the spring III, the pull-back plate 108 on the locking plate 42 is not clamped with the push rod I107, at the moment, the two groups of push plates I104 are pushed, the two groups of push plates I104 move towards positions far away from each other, when the patient sits on the bottom plate 1, legs are placed between the fixed clamping plate 102 and the movable clamping plate 105, then the push plates I104 are pushed, the movable clamping plate 105 clamps the legs between the fixed clamping plate 102, when the locking plate 42 is squeezed by the squeezing plate 93, the locking plate 42 drives the pull-back plate 107 to move, the pull-back plate 107 clamps the push rod I107, at the moment, the movable clamping plate 105 fixes and clamps the legs of the patient, the legs of the patient are prevented from bouncing during puncturing, and the design can adjust the height and the inclination angle of the supporting plate according to the height of the patient, make things convenient for the patient to lie prone and carry out the puncture operation on the layer board, improve the puncture and make patient's comfort level, make things convenient for medical personnel to carry out the puncture operation simultaneously.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims (9)

1. The utility model provides a special seat of thorax puncture convenient to patient uses, includes bottom plate (1), its characterized in that, top one side rigid coupling of bottom plate (1) has complementary unit (2) rather than the slope setting, complementary unit (2) include back board (3) with bottom plate (1) top rigid coupling, mounting groove (4) that set up along its length direction are seted up to one side top that back board (3) are close to bottom plate (1), movable backup plate (5) have been cup jointed to the inside slide of mounting groove (4), one side that mounting groove (4) top one end was stretched out in movable backup plate (5) articulates there is layer board (6), holding tank (7) that set up along its length direction are seted up to the bottom of layer board (6), the one end that movable backup plate (5) were kept away from in holding tank (7) is rotated and is connected with telescopic machanism (8), the one end that layer board (6) were kept away from in telescopic machanism (8) is connected with docking mechanism ( ) A locking mechanism is arranged on one side, close to the backrest plate (3), of the butt joint mechanism (9), and the bottom of the auxiliary mechanism (2) is connected with a leg clamping mechanism (10) fixedly connected with the bottom plate (1);

docking mechanism (9) including two sets of parallel arrangement and with side shield (91) of the L type structure of backboard (3) rigid coupling, two sets of one side that side shield (91) is close to each other begins to have along guide way (92) that its length direction set up, two sets of sliding connection has stripper plate (93) of U type structure between guide way (92), the inside sliding connection of stripper plate (93) has regulating plate (94), regulating plate (94) screw thread sleeve has the regulation pole (95) that cup joints with stripper plate (93) activity.

2. The special thoracentesis seat convenient for a patient to use according to claim 1, wherein the telescopic mechanism (8) comprises a sleeve (81) rotatably connected with the accommodating groove (7), one end of the sleeve (81) far away from the accommodating groove (7) is slidably sleeved with a movable tube (82) sliding along the length direction thereof, a push rod (83) sliding along the length direction thereof is slidably sleeved inside the movable tube (82), one end of the movable tube (82) extending into the sleeve (81) is fixedly connected with a cover plate (84), one side of the cover plate (84) close to the movable tube (82) is provided with two groups of sliding grooves (85) symmetrically distributed along the axis thereof, the sliding grooves (85) are arranged along the diameter direction of the cover plate (84), the sliding grooves (85) are slidably connected with a clamping plate (86), one end of the clamping plate (86) close to the push rod (83) is fixedly connected with a butting block (87) with a trapezoidal structure, one side of each two groups of abutting blocks (87) close to each other is provided with a pushing block (810) of a circular truncated cone structure fixedly connected with the pushing rod (83), and two sides of one end of the movable tube (82) close to the cover plate (84) are provided with abutting holes (88) movably sleeved with the abutting blocks (87).

3. The special thoracentesis seat convenient for a patient to use according to claim 2, wherein a rotating shaft (811) movably sleeved with the inner side wall of the extrusion plate (93) is fixedly connected to one end of the movable tube (82) extending out of one end of the sleeve (81), an adapter plate (812) of a semicircular structure positioned on the outer side of the movable tube (82) is fixedly connected to one end of the push rod (83) close to the back plate (3), a rack of a circular arc structure is fixedly connected to the outer convex surface of the adapter plate (812), and the rack is clamped with the adjusting plate (94) in a clamping groove mode through a clamping tooth.

4. The special thoracentesis seat convenient for a patient to use according to claim 2, wherein the two sides of the inner side wall of the sleeve (81) are provided with clamping grooves (89) arranged along the length direction thereof, and the clamping grooves (89) are clamped with the clamping plates (86) in a manner of clamping tooth clamping grooves.

5. The thoracentesis special chair convenient for patients to use according to claim 2, wherein a first spring is fixedly connected between the pushing block (810) and the cover plate (84), a second spring is fixedly connected to the side of each of the two clamping plates (86) away from each other, and the second spring is fixedly connected to the side wall of the end of the sliding groove (85).

6. The thoracentesis special chair convenient for a patient to use according to claim 1, wherein the locking mechanism comprises a channel (41) which is positioned in the mounting groove (4) and penetrates through the backrest plate (3), a locking plate (42) is sleeved on an internal slide way of the channel (41), and a spring III is fixedly connected between the locking plate (42) and the side baffle (91).

7. The special thoracentesis seat convenient for a patient to use according to claim 1, wherein a pushing groove which is obliquely arranged is formed below one side of the pressing plate (93) close to the backboard (3), the bottom of the bottom plate (1) is provided with a supporting leg, and an inner side wall of the accommodating groove (7) close to one end of the backboard (3) is provided with an inwardly-recessed arc-shaped accommodating groove.

8. The thoracentesis special chair convenient for a patient to use according to claim 1, wherein the leg clamping mechanism (10) comprises an extension plate (101) which is positioned at the bottom of the auxiliary mechanism (2) and fixedly connected with the end of the bottom plate (1), fixed clamping plates (102) are fixedly connected to two adjacent sides of the extension plate (101) and the bottom plate (1), a sliding groove (103) which is arranged along the length direction of the extension plate (101) is formed in one side of the extension plate (101) far away from the bottom plate (1), two groups of first push plates (104) which are symmetrically arranged along the middle position of the extension plate (101) and are of an L-shaped structure are slidably connected to the sliding groove (103), a movable clamping plate (105) which is arranged in parallel to the fixed clamping plate (102) is fixedly connected to one end of the two groups of first push plates (104) far away from each other, and the two groups of movable clamping plates (105) are positioned on one side of the two groups of fixed clamping plates (102) far away from each other, the top of one end of each of the two groups of first push plates (104) extending out of the sliding groove (103) is fixedly connected with a second push plate (106) of an L-shaped structure extending above the extending plate (101), the top of each of the two groups of second push plates (106) is fixedly connected with a first push rod (107), and the top of each of the two groups of first push rods (107) is provided with a same pull-back plate (108) of the L-shaped structure in sliding sleeve joint with the side baffle (91).

9. The special thoracentesis seat convenient for a patient to use according to claim 8, wherein one end of the pull-back plate (108) extending into the side baffle (91) is fixedly connected with the bottom of the locking plate (42), and the pull-back plate (108) is clamped with the first push rod (107) in a clamping manner of a clamping tooth.

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