Multifunctional rescue medical transfer trolley

Abstract

The application discloses a multifunctional rescue medical transfer trolley, which comprises a bed body, guardrails located at the front side and the rear side of the bed body, and a protection assembly. The protection assembly comprises a reel and a protection curtain cloth wound outside the reel. The inner side end of the protection curtain cloth is fixed with the reel. The outer side end of the protection curtain cloth is pulled to expand the protection curtain cloth and cover above the bed body. At least one set of telescopic supporting assemblies is arranged in the guardrails. The telescopic supporting assemblies move upward when the protection curtain cloth is expanded. When the protection curtain cloth is completely expanded, the upper ends of the telescopic supporting assemblies are provided with supporting portions which horizontally extend into the bed body and support the front end and the rear end of the protection curtain cloth respectively. Through the cooperative movement of the telescopic supporting assemblies and the expansion and winding of the protection curtain, the operation steps of medical staff can be reduced, and the operation is simple and convenient.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a multifunctional emergency medical transport vehicle. Background Technology

[0002] With hospital expansion, many hospitals now have multiple buildings, with separate outpatient and inpatient departments. However, inpatients sometimes need to go to the outpatient building for certain examinations. Transport vehicles are also necessary to move patients with limited mobility or those who are critically ill to other departments or examination rooms.

[0003] Currently, the patient transport vehicles used in clinical practice do not have the function of sheltering from wind and rain. When passing through outdoor roads without corridors, patients are exposed to the elements. In case of bad weather, patients will inevitably be exposed to the sun and rain during the transport process. Some special patients cannot be exposed to the wind. The transport process can easily have a very bad impact on the patient's pain, and in severe cases, it may even lead to some life-threatening situations. Summary of the Invention

[0004] The purpose of this invention is to provide a multi-functional emergency medical transport vehicle to solve the problem mentioned in the background art where patients are exposed to the elements during transport in severe weather.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0006] A multi-functional emergency medical transport vehicle includes a bed and guardrails located on the front and rear sides of the bed, and also includes a protective assembly. The protective assembly includes a roller and a protective curtain wound around the outside of the roller. The inner end of the protective curtain is fixed to the roller. Pulling the outer end of the protective curtain unfolds the protective curtain to cover the top of the bed.

[0007] The guardrail has at least one set of telescopic support components. When the protective curtain is unfolded, the telescopic support components move upward. When the protective curtain is fully unfolded, the upper end of the telescopic support components has a support portion that extends horizontally into the bed body. The support portion supports the front end and the rear end of the protective curtain respectively.

[0008] Preferably, each telescopic support assembly includes a slider, two fixed pulleys, and a pull rope. The slider is located between the two fixed pulleys. The bottom of the slider has a horizontally extending first wire hole, or the bottom surface of the slider has a wire groove. The pull rope extends downward after passing the upper part of the left fixed pulley and passes through the first wire hole or wire groove of the slider, and then upward through the left side and upper part of the right fixed pulley. Pulling the pull rope will cause the slider to move upward, thereby causing the slider to extend upward out of the guardrail.

[0009] Preferably, each telescopic support assembly further includes a rotating component. The slider is a U-shaped structure with an open top. A pivot shaft extending horizontally in the left-right direction is provided between the two vertical sections of the slider. The rotating component is L-shaped and has a shaft hole. The pivot shaft passes through the shaft hole. The rotating component can move up and down with the slider and can rotate relative to the slider.

[0010] Preferably, the guardrail has a receiving cavity, the telescopic support assembly is located in the receiving cavity, and the guardrail has a longitudinally extending slide rail recessed in the inner wall of the receiving cavity on the side away from the bed, and the upper end of the slide rail is provided with an abutment block.

[0011] In the initial position, the end of the first segment of the rotating component, which is horizontally positioned, extends into the slide rail. After the rotating component moves upward with the slider for a certain distance, it abuts against the abutment block. The slider continues to move upward, and the rotating component rotates to flip the second segment, which was initially vertically positioned, to the horizontal position, and extends into the bed body to form the support part.

[0012] Preferably, the pull rope corresponding to the front guardrail of the bed is wound around the front end of the reel, and the pull rope corresponding to the rear guardrail of the bed is wound around the rear end of the reel. The bottom of the bed is provided with a second wire hole that communicates with the receiving cavity.

[0013] Preferably, the bottom of the bed is provided with a positioning mechanism to limit the travel trajectory of the pull rope.

[0014] Preferably, the outer end of the protective curtain is fixed with a positioning shaft, the protective component is located at the bottom left or bottom right of the bed and extends in the front-to-back direction, and a positioning clip is provided at the bottom right or bottom left of the bed. When the protective curtain is fully unfolded and covers the bed, the positioning shaft is engaged with the positioning clip to fix the protective curtain.

[0015] Preferably, the front end and / or rear end of the reel are provided with a position locking component, the position locking component includes a ratchet and a pawl, the outer peripheral surface of the ratchet is regularly arranged with limiting teeth, the pawl has a limiting plane that cooperates with the limiting teeth, and the bottom of the bed is provided with a rotating shaft passing through the pawl, the pawl can rotate relative to the rotating shaft;

[0016] During the unfolding of the protective curtain, the ratchet rotates, causing the pawl to flip upwards. When the protective curtain is fully unfolded, the ratchet stops rotating, and the pawl is engaged in the limiting teeth under the action of gravity.

[0017] Preferably, the upper end of the pawl is provided with a paddle, which is fixed to the pawl at an angle of 80-100 degrees. By pulling the paddle upward, the pawl is rotated upward and disengaged from the ratchet, thereby releasing the lock between the ratchet and the pawl.

[0018] Preferably, the bottom of the bed is provided with a mounting groove, the outer end of the lever is located below the mounting groove, the outer end of the lever can rotate upward into the mounting groove, the bottom of the mounting groove is provided with a positioning hole, an elastic pin is provided between the positioning hole and the lever, a positioning ring is provided in the middle of the elastic pin, a compression spring is sleeved on the outer side of the elastic pin, one end of the compression spring abuts against the bottom of the positioning hole, the other end of the compression spring abuts against the positioning ring, and the lower end of the elastic pin abuts against the upper surface of the lever.

[0019] Compared with the prior art, the advantages of the present invention are as follows:

[0020] The protective roller shutter unfolds to cover the bed, and is raised by telescopic support components located in the front and rear guardrails to prevent it from sticking to the patient, providing excellent protection during transport. The coordinated movement of the telescopic support components and the unfolding and retracting of the protective roller shutter reduces the number of steps required by medical staff, making operation simple and convenient. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of the multi-functional emergency medical transport vehicle of the present invention. Figure 1 ;

[0023] Figure 2 This is a schematic diagram of the structure of the multi-functional emergency medical transport vehicle of the present invention. Figure 2 ;

[0024] Figure 3 This is a partial structural schematic diagram of the multifunctional emergency medical transport vehicle of the present invention;

[0025] Figure 4 This is a cross-sectional schematic diagram of the multi-functional emergency medical transport vehicle of the present invention;

[0026] Figure 5 This is a schematic diagram of the telescopic support assembly when the protective curtain is in the retracted state in this invention;

[0027] Figure 6 This is a schematic diagram of the telescopic support assembly when the protective curtain is fully extended in this invention. Figure 1 ;

[0028] Figure 7 This is a schematic diagram of the telescopic support assembly when the protective curtain is fully extended in this invention. Figure 2 ;

[0029] Figure 8 This is a schematic diagram of the position locking component in this invention;

[0030] Figure 9 This is an exploded view of the position locking component in this invention;

[0031] Figure 10 This is an exploded view of the telescopic support assembly in this invention.

[0032] In the diagram: 1. Bed frame; 11. Positioning hole; 12. Mounting slot; 2. Guardrail; 21. Body; 22. Cover plate; 221. Groove; 23. Slide rail; 24. Abutment block; 3. Protective assembly; 31. Reel; 32. Positioning shaft; 4. Telescopic support assembly; 41. Slider; 411. First line hole; 42. Fixed pulley; 43. Pull rope; 44. Rotating component; 441. First section; 442. Second section; 443. Shaft hole; 45. Pivot shaft; 51. Positioning block; 6. Positioning clip; 7. Position locking assembly; 71. Ratchet; 711. Limiting tooth; 72. Pawl; 73. Rotating shaft; 74. Paddle; 75. Elastic pin; 751. Positioning ring; 76. Compression spring. Detailed Implementation

[0033] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0034] A multi-functional emergency medical transport vehicle, combining Figures 1-10 As shown, it includes a bed frame 1, guardrails 2 located on the front and rear sides of the bed frame 1, and a protective assembly 3 located at the bottom of the bed frame 1.

[0035] The protective assembly 3 includes a roller 31 and a protective curtain wound around the outside of the roller 31. The roller 31 has supports at both ends, and a housing with an opening is located between the two supports. The protective curtain and roller 31 are housed within the housing. The inner end of the protective curtain is fixed to the roller 31, and the outer end of the protective curtain extends out of the housing through the opening and is fixed with a positioning shaft 32. The roller 31 can rotate relative to the two supports. Pulling the positioning shaft 32 at the outer end of the protective curtain unfolds the curtain, allowing it to be easily placed over the bed 1, providing wind protection during outdoor patient transport and reducing the risk of injury to the patient due to weather conditions. A return torsion spring is installed inside the roller 31 to reset the roller 31, i.e., to roll the protective curtain from the unfolded state to the outside of the roller 31.

[0036] The front and rear guardrails 2 each have at least one set of telescopic support components 4. As the protective curtain unfolds, the telescopic support components 4 move upwards. When the protective curtain is fully unfolded, the upper end of the telescopic support components 4 has a support portion extending horizontally into the bed frame 1, which supports the front and rear ends of the protective curtain. The upward-extending telescopic support components 4 can raise the protective curtain, thus preventing it from sticking to the patient's body due to being too low.

[0037] Specifically, the guardrail 2 includes a body 21 and a cover plate 22. The cover plate 22 is located on the side close to the bed 1. A receiving cavity is provided between the cover plate 22 and the body 21. The telescopic support assembly 4 is located in the receiving cavity. Each telescopic support assembly 4 includes a slider 41, two fixed pulleys 42, a rotating part 44, and a pull rope 43. The slider 41 is located between the two fixed pulleys 42. The bottom of the slider 41 is provided with a horizontally extending first wire hole 411, or the bottom surface of the slider 41 is provided with a wire groove. The pull rope 43 extends downward after passing the upper part of the left fixed pulley 42 and passes through the first wire hole 411 or wire groove of the slider 41, and then goes upward through the left side and the upper part of the right fixed pulley 42. Pulling the pull rope 43 will drive the slider 41 to move upward, thereby causing the slider 41 to extend upward out of the guardrail 2.

[0038] The slider 41 has a U-shaped structure with an open top. A pivot shaft 45 extending horizontally in the left-right direction is provided between the two vertical sections of the slider 41. The rotating member 44 is L-shaped and has a shaft hole 443. The shaft hole 443 is located on the first horizontally set section 441. The pivot shaft 45 passes through the shaft hole 443. The rotating member 44 can move up and down with the slider 41 and can rotate relative to the slider 41.

[0039] The cover plate 22 has a slot 221 extending to the upper end corresponding to the position of the rotating member 44. The body 21 is recessed in the inner wall of the receiving cavity to form a longitudinally extending slide rail 23. The slide rail 23 corresponds one-to-one with the rotating member 44. The upper end of the slide rail 23 is provided with an abutment block 24.

[0040] In the initial position, when the reel 31 is fully wound up, the end of the first section 441 of the rotating member 44, which is horizontally positioned, extends into the slide rail 23. After the rotating member 44 moves upward a certain distance with the slider 41, the upper surface of the rotating member 44 abuts against the abutment block 24. The slider 41 continues to move upward, and the rotating member 44 rotates around the pivot shaft 45, causing the second section 442, which was initially vertically positioned, to flip upward, and the first section 441 to flip downward and abut against the side of the abutment block 24, thereby making the second section 442 horizontal. The second section 442 extends into the bed body 1 to form a support. A magnet is provided on the upper surface of the second section 442 when it is horizontal. The front and rear ends of the protective curtain are also provided with flexible magnetic attractors that can be attracted to the magnets, thereby fixing the protective curtain.

[0041] The pull rope 43 corresponding to the front guardrail 2 of the bed body 1 is wound around the front end of the reel 31, and the pull rope 43 corresponding to the rear guardrail 2 of the bed body 1 is wound around the rear end of the reel 31. The bottom of the bed body 1 is provided with a second wire hole communicating with the receiving cavity. The pull rope 43 enters the receiving cavity through the second wire hole and is wound around the outside of the fixed pulley 42. The bottom of the bed body 1 is provided with a positioning mechanism to limit the travel trajectory of the pull rope 43. The positioning mechanism includes a positioning block 51, and the positioning block 51 is provided with a positioning wire hole for the pull rope 43 to pass through.

[0042] A positioning shaft 32 is fixed to the outer end of the protective curtain. The protective component 3 is located at the bottom left or right side of the bed frame 1 and extends in the front-to-back direction. A positioning clip 6 is provided at the bottom right or left side of the bed frame 1. When the protective curtain is fully unfolded and covers the bed frame 1, the positioning shaft 32 engages with the positioning clip 6 to secure the protective curtain. Specifically, the positioning clip 6 is a snap ring structure with a notch on the inside. In use, simply engage the positioning shaft 32 with the positioning clip 6; the operation is simple and convenient.

[0043] When medical staff or transport personnel pull the positioning shaft 32 outward to unfold the protective curtain, they also drive the roller 31 to rotate, thereby pulling the pull cable and causing the slider 41 to move upward. Moreover, by designing a suitable stroke, when the protective curtain is fully unfolded, that is, when the positioning shaft 32 is engaged with the positioning clip 6, the slider 41 slides to the top, and the rotating part 44 flips to form a support extending into the bed 1, supporting and fixing the protective curtain. This design is ingenious and is achieved entirely through a simple mechanical structure. Furthermore, when the protective curtain is not in use, the protective component 3 is completely hidden at the bottom of the bed 1, and the telescopic support component 4 is also completely hidden inside the guardrail 2, so as not to affect the normal use of the medical bed.

[0044] The front end and / or rear end of the scroll 31 are provided with a position locking component 7, which includes a ratchet 71 and a pawl 72. The outer circumferential surface of the ratchet 71 is regularly arranged with limiting teeth 711. The pawl 72 has a limiting plane that cooperates with the limiting teeth 711. The bottom of the bed 1 is horizontally provided with a rotating shaft 73 that passes through the pawl 72. The pawl 72 can rotate relative to the rotating shaft 73. During the unfolding of the protective curtain, the ratchet 71 rotates, causing the pawl 72 to flip upward. When the protective curtain is fully unfolded, the ratchet 71 stops rotating, and the pawl 72 is locked into the limiting teeth 711 under the action of gravity.

[0045] The upper end of the pawl 72 is provided with a lever 74, which is fixed to the pawl 72 at an angle of 80-100 degrees. Moving the lever 74 upwards causes the pawl 72 to flip upwards and disengage from the ratchet 71, thereby releasing the lock between the ratchet 71 and the pawl 72. The bottom of the bed 1 is provided with a mounting groove 12. The outer end of the lever 74 is located below the mounting groove 12 and can rotate upwards into the mounting groove 12. The bottom of the mounting groove 12 is provided with a positioning hole 11. A flexible pin 75 is provided between the positioning hole 11 and the lever 74. A positioning ring 751 is provided in the middle of the flexible pin 75. A compression spring 76 is sleeved on the outer side of the flexible pin 75. One end of the compression spring 76 abuts against the bottom of the positioning hole 11, and the other end abuts against the positioning ring 751. The lower end of the flexible pin 75 abuts against the lever 74. When the protective curtain is fully unfolded, the ratchet 71 stops rotating, and the pawl 72 engages with the limiting tooth 711 under the action of gravity and the abutment of the elastic pin 75. During the unfolding process, the rotation of the ratchet 71 pushes the pawl 72 upwards, causing the pawl 72 to push the elastic pin 75 into the positioning hole 11, without affecting the unfolding of the protective curtain. Specifically, the tooth groove angle of the limiting tooth 711 is 60 degrees, and the tooth deviation angle of the limiting tooth 711 is 0 degrees.

[0046] Combination Figures 8-9 As shown, when the protective curtain is unfolded, the roller 31 and ratchet 71 rotate counterclockwise. At this time, the ratchet 71 moves the pawl 72, and the pawl 72 rotates clockwise around the shaft 73. Therefore, the ratchet 71 will not impact the pawl 72. When the protective curtain is fully unfolded and locked, the ratchet 71 stops rotating, and the pawl 72, under the force of gravity and the elastic pin 75, will engage with the limiting tooth 711 to lock its position. When it is necessary to roll up the protective curtain, the lever 74 is pulled upwards, causing the pawl 72 to rotate clockwise and disengage from the ratchet 71, thereby releasing the position lock between the ratchet 71 and the pawl 72. The roller 31 then rolls up the curtain under the action of the return torsion spring.

[0047] In this embodiment, the sides of the bed are also equipped with protective railings. After the protective curtain is unfolded, the protective railings located on the left and right sides of the bed can also support the protective curtain, preventing the protective curtain from being too low and sticking to the patient's body.

[0048] The components of the embodiments of the invention described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0049] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0050] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0051] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-functional emergency medical transport vehicle, comprising a bed (1) and guardrails (2) located on the front and rear sides of the bed (1), characterized in that, It also includes a protective component (3), which includes a roller (31) and a protective curtain wrapped around the outside of the roller (31). The inner end of the protective curtain is fixed to the roller (31). Pulling the outer end of the protective curtain unfolds the protective curtain to cover the bed frame (1). The guardrail (2) has at least one set of telescopic support components (4). When the protective curtain is unfolded, the telescopic support components (4) move upward. When the protective curtain is fully unfolded, the upper end of the telescopic support components (4) has a support part that extends horizontally into the bed body (1). The support part supports the front end and the rear end of the protective curtain respectively. Each telescopic support assembly (4) includes a slider (41), two fixed pulleys (42) and a pull rope (43). The slider (41) is located between the two fixed pulleys (42). The bottom of the slider (41) is provided with a horizontally extending first wire hole (411), or the bottom surface of the slider (41) is provided with a wire groove. The pull rope (43) extends downward after passing the upper part of the left fixed pulley (42) and passes through the first wire hole (411) or wire groove of the slider (41), and then goes upward through the left and upper parts of the right fixed pulley (42). Pulling the pull rope (43) will drive the slider (41) to move upward, thereby causing the slider (41) to extend upward out of the guardrail (2). Each telescopic support assembly (4) further includes a rotating component (44). The slider (41) is a U-shaped structure with an open top. A pivot shaft (45) extending horizontally in the left and right direction is provided between the two vertical sections of the slider (41). The rotating component (44) is L-shaped. A shaft hole (443) is provided on the rotating component (44). The pivot shaft (45) passes through the shaft hole (443). The rotating component (44) can move up and down with the slider (41), and the rotating component (44) can rotate relative to the slider (41). The guardrail (2) has a receiving cavity, and the telescopic support assembly (4) is located in the receiving cavity. The guardrail (2) has a longitudinally extending slide rail (23) recessed on the inner wall of the receiving cavity away from the bed (1). The upper end of the slide rail (23) is provided with an abutment block (24). In the initial position, the end of the first segment (441) of the rotating member (44) is horizontally positioned and extends into the slide rail (23). After the rotating member (44) moves upward a certain distance with the slider (41), the rotating member (44) abuts against the abutment block (24). The slider (41) continues to move upward. The rotating member (44) rotates to flip the second segment (442) which was initially vertically positioned to the horizontal position and extends into the bed body (1) to form the support part.

2. The multi-functional emergency medical transport vehicle according to claim 1, characterized in that, The pull rope (43) corresponding to the front guardrail (2) of the bed body (1) is wound around the front end of the reel (31), and the pull rope (43) corresponding to the rear guardrail (2) of the bed body (1) is wound around the rear end of the reel (31). The bottom of the bed body (1) is provided with a second wire hole that communicates with the receiving cavity.

3. A multi-functional emergency medical transport vehicle according to claim 2, characterized in that, The bottom of the bed (1) is provided with a positioning mechanism to limit the travel trajectory of the pull rope (43).

4. A multi-functional emergency medical transport vehicle according to any one of claims 1-3, characterized in that, The outer end of the protective curtain is fixed with a positioning shaft (32). The protective component (3) is located at the bottom left or bottom right of the bed (1) and extends in the front-back direction. A positioning clip (6) is provided at the bottom right or bottom left of the bed (1). When the protective curtain is fully unfolded and covers the bed (1), the positioning shaft (32) is inserted into the positioning clip (6) to fix the protective curtain.

5. A multi-functional emergency medical transport vehicle according to any one of claims 1-3, characterized in that, The front end and / or rear end of the scroll (31) are provided with a position locking component (7), the position locking component (7) includes a ratchet (71) and a pawl (72), the outer peripheral surface of the ratchet (71) is regularly arranged with limiting teeth (711), the pawl (72) has a limiting plane that cooperates with the limiting teeth (711), and the bottom of the bed (1) is provided with a rotating shaft (73) that passes through the pawl (72), the pawl (72) can rotate relative to the rotating shaft (73); During the unfolding of the protective curtain, the ratchet (71) rotates, causing the pawl (72) to flip upward. When the protective curtain is fully unfolded, the ratchet (71) stops rotating, and the pawl (72) is engaged in the limiting tooth (711) under the action of gravity.

6. A multi-functional emergency medical transport vehicle according to claim 5, characterized in that, The upper end of the pawl (72) is provided with a paddle (74). The paddle (74) is fixed to the pawl (72) and the included angle is 80-100 degrees. When the paddle (74) is pulled upward, the pawl (72) is rotated upward and disengaged from the ratchet (71), thereby releasing the lock between the ratchet (71) and the pawl (72).

7. A multi-functional emergency medical transport vehicle according to claim 6, characterized in that, The bottom of the bed body (1) is provided with a mounting groove (12). The outer end of the lever (74) is located below the mounting groove (12). The outer end of the lever (74) can rotate upward into the mounting groove (12). The bottom of the mounting groove (12) is provided with a positioning hole (11). An elastic pin (75) is provided between the positioning hole (11) and the lever (74). A positioning ring (751) is provided in the middle of the elastic pin (75). A compression spring (76) is sleeved on the outer side of the elastic pin (75). One end of the compression spring (76) abuts against the bottom of the positioning hole (11), and the other end of the compression spring (76) abuts against the positioning ring (751). The lower end of the elastic pin (75) abuts against the upper surface of the lever (74).

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