A seat headrest folding structure

Abstract

The utility model discloses a seat headrest folding structure effectively facilitates the quick folding of seat headrest, including with the fixed link of seat framework connection, the upper side rotation of fixed link is connected with the headrest framework, the middle part fixed link is connected with the lock body, the inside of headrest framework is equipped with the rotating lock tongue, the upper side of lock tongue is detachably connected with transmission link, the inside of headrest framework is equipped with rotatable transmission block, the upper side of transmission link with transmission block rotation is connected, the utility model discloses novel structure, the clever idea is ingenious, and the operation is simple and convenient, effectively facilitates the folding operation, increases the stability when the device uses, makes the force of pulling process more uniform, through increasing the force arm length, and then can reduce the force size, and the device is installed conveniently, increase the anti -impact ability of device, and the staff is assembled conveniently.

Description

Technical Field

[0001] This utility model belongs to the field of automotive seat technology and relates to a folding headrest structure. Background Technology

[0002] Most car seat headrests are adjustable up and down. As car seats are used in more diverse scenarios, such as when the backrest is folded flat to form a bed, the headrest affects the folding of the seat and needs to be removed. In this case, for ease of operation, foldable headrests are needed. Due to their high convenience and space utilization, they are now widely used in various types of cars.

[0003] However, the existing headrest folding mechanisms in vehicles generally have a large wobble (gap) after locking. The operation of unlocking and folding the existing headrest folding mechanisms is cumbersome. The instability of the locking mechanism after locking can cause accidental flipping. The adjustment is not smooth, and in severe cases, it can even cause injury to the occupants. Safety cannot be guaranteed, resulting in a poor user experience.

[0004] Furthermore, existing manual headrest folding mechanisms directly apply force to the locking mechanism via a pull cord and are reset via a torsion spring. This means that during the headrest folding process, the torsion spring needs to continuously accumulate force to ensure the stability of the locking structure. To maintain the stability of the locking structure, the force exerted by the torsion spring is relatively large, which means that a large torque needs to be overcome manually. Moreover, the force applied during the force application process is not uniform. As the torsion spring accumulates force, an even greater torque is required to unlock the headrest, which is very inconvenient. Therefore, a more labor-saving headrest folding mechanism is needed to solve the above problems. Utility Model Content

[0005] To address the aforementioned problems, this utility model proposes a folding headrest structure for seats, which effectively solves the problems in the prior art.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A folding headrest structure includes a fixed rod connected to a seat frame, a headrest frame rotatably connected to the upper side of the fixed rod, a lock body fixedly connected to the middle of the fixed rod, a rotating latch inside the headrest frame, the latch and the lock body cooperating to form a structure in which the headrest frame and the fixed rod are relatively fixed in position, a transmission rod detachably connected to the upper side of the latch, a rotatable transmission block inside the headrest frame, the upper side of the transmission rod rotatably connected to the transmission block, and the rotation of the transmission block forming a structure in which the transmission rod drives the latch to move up and down.

[0008] Preferably, the fixed rod has a through hole inside, a guide line is fixedly connected inside the through hole, and a pull rope is provided inside the guide line.

[0009] Preferably, the upper end of the pull rope is fixedly connected to a limiting block, the inside of the headrest frame is rotatably connected to a power disk, the middle of the power disk is provided with a first cable management groove, the middle of the power disk is provided with a limiting groove, and the upper part of the pull rope passes around the first cable management groove so that the limiting block and the limiting groove cooperate with each other.

[0010] Preferably, a first torsion spring is provided on the front side of the power disc, and the two ends of the first torsion spring are respectively connected to the power disc and the headrest frame.

[0011] Preferably, a first actuating block is fixedly connected to the rear side of the power plate, and a second actuating block is fixedly connected to the side of the transmission block near the first actuating block, with the upper side of the first actuating block abutting against the lower side of the second actuating block.

[0012] Preferably, the transmission block has a rotating groove in the middle, and two first disassembly blocks are fixedly connected inside the rotating groove. The upper side of the transmission rod has two first disassembly grooves that are adapted to the first disassembly blocks. A rotating rod is fixedly connected in the middle of the rotating groove. A rotating hole is opened in the middle of the upper side of the transmission rod. Two second disassembly blocks are fixedly connected to the outer side of the rotating rod. The rotating hole has two second disassembly grooves that are adapted to the second disassembly blocks.

[0013] Preferably, a second torsion spring is provided on the front side of the transmission block, and the two ends of the second torsion spring are rotatably connected to the transmission block and the headrest frame, respectively.

[0014] Preferably, the headrest frame includes a front headrest and a rear headrest, and the front headrest and the rear headrest are detachably connected.

[0015] Preferably, a third torsion spring is provided on each of the left and right sides of the lock body, and both ends of each third torsion spring are respectively connected to the lock body and the headrest frame.

[0016] Preferably, a positioning rod is fixedly connected to the front of the latch, and the latch is rotatably connected to the headrest frame through the positioning rod. A connecting groove is provided on the upper side of the latch, and a connecting rod that matches the connecting groove is fixedly connected to the lower side of the transmission rod.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. This utility model has a locking tongue and a locking body. When the locking tongue and the locking body cooperate with each other, the two interact to prevent the headrest frame from rotating relative to the fixed rod, thereby limiting the angle of the headrest frame relative to the seat frame. By rotating the locking tongue, the locking tongue and the locking body will be disengaged, allowing the headrest to rotate. By setting the locking tongue and the locking body, the cooperation strength between the headrest and the seat frame can be enhanced, thereby increasing the stability of the device.

[0019] 2. This utility model has a transmission rod that can move up and down. By driving the transmission rod to move up and down, the locking tongue can be rotated to unlock. In addition, the transmission rod can be easily applied through the lever principle, which can reduce the amount of force applied during operation and make the force application process more uniform. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0021] Figure 2 This is a schematic diagram of the internal structure of the front headrest in this utility model.

[0022] Figure 3 This is a schematic diagram of the structure of the power disc and transmission block in this utility model.

[0023] Figure 4 This is a schematic diagram of the structure of the latch and lock body in this utility model.

[0024] In the diagram: 1. Fixed rod; 2. Headrest frame; 3. Lock body; 4. Lock tongue; 5. Transmission rod; 6. Transmission block; 7. Guide line; 8. Pull rope; 9. Limiting block; 10. Power plate; 11. First cable management groove; 12. Limiting groove; 13. First torsion spring; 14. First actuating block; 15. Second actuating block; 16. Rotating groove; 17. First disassembly block; 18. First disassembly groove; 19. Rotating rod; 20. Rotating hole; 21. Second disassembly block; 22. Second disassembly groove; 23. Second torsion spring; 24. Front headrest; 25. Rear headrest; 26. Third torsion spring; 27. Positioning rod; 28. Connecting groove; 29. ​​Connecting rod. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] The following is in conjunction with the appendix Figures 1 to 4 The specific embodiments of this utility model will be described in further detail.

[0027] Depend on Figures 1 to 4As shown, this utility model includes a fixing rod 1 connected to the seat frame, a headrest frame 2 rotatably connected to the upper side of the fixing rod 1, a lock body 3 fixedly connected to the middle of the fixing rod 1 for easy quick folding of the seat headrest, a rotating locking tongue 4 provided inside the headrest frame 2, the locking tongue 4 and the lock body 3 cooperate with each other to form a structure in which the headrest frame 2 and the fixing rod 1 are relatively fixed in position, a transmission rod 5 detachably connected to the upper side of the locking tongue 4, a rotatable transmission block 6 provided inside the headrest frame 2, the upper side of the transmission rod 5 rotatably connected to the transmission block 6, the rotation of the transmission block 6 forms a structure in which the transmission rod 5 drives the locking tongue 4 to move up and down;

[0028] It should be noted that the lock body 3 has a protrusion that matches the lower part of the lock tongue 4, and the lock tongue 4 has a groove that matches the protrusion. When the two are engaged, the protrusion and the groove engage with each other, limiting the rotation angle of the headrest frame 2 relative to the fixed rod 1. When the groove rotates upward with the lock tongue 4, the protrusion and the groove will disengage, and the headrest frame 2 can then rotate relative to the fixed rod 1, thereby folding the headrest frame 2 forward relative to the seat back.

[0029] In this embodiment, the seat frame refers to the seat back frame of a car seat. During the operation of this device, it can be regarded as a fixed component. In actual use, the fixing rod 1 can be equipped with a lifting mechanism between itself and the seat frame, thereby adjusting the height of the headrest. The height adjustment of the headrest will not be described in detail here. In addition, when it is not necessary to adjust the height of the headrest, the fixing rod 1 can also be directly fixedly connected to the seat frame, thus making the fixing rod 1 a fixed component as well. The headrest frame 2 is the main structure of the car seat headrest. Generally, it is also equipped with a covering layer on the outside for protecting the head of the occupant.

[0030] The fixing rod 1 includes two vertical rods and one horizontal rod. The left and right ends of the horizontal rod are respectively connected to the upper ends of the two vertical rods, forming an n-shape. The headrest frame 2 has a placement groove inside. Under the action of the placement groove, the headrest frame 2 is rotatably connected to the horizontal rod.

[0031] A chamfer is provided on the rear side of the locking tongue 4. When the headrest frame 2 is in a folded state and needs to be re-engaged with the lock body 3, the headrest frame 2 can be moved upward directly. At this time, the chamfer will first contact the protrusion of the lock body 3, and then move the locking tongue 4 upward to facilitate the engagement of the protrusion and the groove. The protrusion and the groove are adapted to each other. The cross section of the groove is trapezoidal. After the protrusion and the groove are engaged, the two will fit tightly, thereby reducing play and making the headrest frame 2 more stable.

[0032] In use, when the latch 4 and lock body 3 cooperate, their interaction prevents the headrest frame 2 from rotating relative to the fixed rod 1, thus limiting the angle of the headrest frame 2 relative to the seat frame and enabling it to provide normal head protection. When the seat back needs to be folded, the headrest frame 2 may interfere with the front seat. In this case, the transmission block 6 can be rotated. During the rotation of the transmission block 6, the upper side of the transmission rod 5 will move upward in a circular motion, which in turn will move the lower side of the transmission rod 5 upward, thereby rotating the latch 4. This will disengage the latch 4 from the lock body 3. Since the lock body 3 is fixed relative to the fixed rod 1, the latch 4 and the headrest frame 2 can rotate forward relative to the upper part of the fixed rod 1, thus completing the folding action of the headrest. When the headrest needs to be reset, the headrest frame 2 can be pulled upward directly. At this time, the latch 4 will cooperate with the lock body 3 again, thereby limiting the position of the headrest frame 2 relative to the seat frame.

[0033] Furthermore, by Figures 1 to 4 As shown, in order to facilitate folding operation, a through hole is provided inside the fixing rod 1, and a guide line 7 is fixedly connected inside the through hole. The guide line 7 has a hollow structure and a pull rope 8 is provided inside the guide line 7. The upper part of the guide line 7 passes through the side wall of the fixing rod 1 and enters the interior of the headrest frame 2, and is engaged with the interior of the headrest frame 2.

[0034] Furthermore, by Figures 1 to 4 As shown, to increase the stability of the device during use, a limiting block 9 is fixedly connected to the upper end of the pull rope 8, and a power disk 10 is rotatably connected inside the headrest frame 2. A first cable management groove 11 is provided in the middle of the power disk 10, and a limiting groove 12 is provided in the middle of the power disk 10. The upper part of the pull rope 8 passes around the first cable management groove 11 so that the limiting block 9 and the limiting groove 12 cooperate with each other. By setting the first cable management groove 11, the probability of the pull rope 8 coming off when the pull rope 8 drives the power disk 10 to rotate can be reduced, thereby increasing the stability of the cooperation between the pull rope 8 and the power disk 10.

[0035] Furthermore, by Figures 1 to 4 As shown, in order to make the force applied during the pulling process more even, a first torsion spring 13 is provided on the front side of the power plate 10, and the two ends of the first torsion spring 13 are respectively connected to the power plate 10 and the headrest frame 2. It should be understood that, in the embodiment, the two ends of the first torsion spring 13 are respectively engaged with the power plate 10 and the headrest frame 2, so that the power plate 10 can store force on the first torsion spring 13 when it rotates relative to the headrest frame 2.

[0036] In use, the side of the pull rope 8 away from the power plate 10 can be connected to the trigger mechanism, which is the mechanism used to pull the pull rope 8. When the trigger mechanism is activated, it will drive the lower end of the pull rope 8 to move. Since the upper part of the pull rope 8 is fixedly connected to the limit block 9 after passing through the first cable management groove 11, the power plate 10 will rotate when the lower end of the pull rope 8 is pulled by force. During this process, the first torsion spring 13 stores force. After the pull rope 8 is released, the power plate 10 will reset under the action of the first torsion spring 13.

[0037] Furthermore, by Figures 1 to 4 As shown, in order to reduce the amount of force applied, a first actuating block 14 is fixedly connected to the rear side of the power disc 10, and a second actuating block 15 is fixedly connected to the side of the transmission block 6 near the first actuating block 14, with the upper side of the first actuating block 14 abutting against the lower side of the second actuating block 15.

[0038] It should be understood that by setting the second actuating block 15, the cooperation position of the second actuating block 15 and the transmission block 6 is at the left and right ends of the transmission block 6. That is, the process of the second actuating block 15 actuating the first actuating block 14 upward is a force-saving lever for the transmission block 6, thereby reducing the force exerted by the second actuating block 15 on the first actuating block 14, and thus reducing the force exerted by the pull rope 8.

[0039] Furthermore, by Figures 1 to 4 As shown, to facilitate the installation of the device, a rotating groove 16 is provided in the middle of the transmission block 6. Two first disassembly blocks 17 are fixedly connected inside the rotating groove 16. Two first disassembly grooves 18 that are adapted to the first disassembly blocks 17 are provided on the upper side of the transmission rod 5. A rotating rod 19 is fixedly connected in the middle of the rotating groove 16. A rotating hole 20 is provided in the middle of the upper side of the transmission rod 5. Two second disassembly blocks 21 are fixedly connected to the outer side of the rotating rod 19. Two second disassembly grooves 22 that are adapted to the second disassembly blocks 21 are provided inside the rotating hole 20.

[0040] In use, during the interaction between the transmission rod 5 and the transmission block 6, the transmission rod 5 needs to be placed at the rear of the transmission block 6, the first disassembly block 17 aligned with the first disassembly groove 18, and the second disassembly block 21 aligned with the second disassembly groove 22. At this time, the transmission rod 5 is in an inclined state (non-working state). The transmission rod 5 can then be pushed forward so that the front side plane of the transmission rod 5 contacts the bottom surface of the rotating groove 16. Then, the transmission rod 5 is rotated so that the first disassembly block 17 and the first disassembly groove 18 are offset from each other, and at the same time, the second disassembly block 21 and the second disassembly groove 22 are offset from each other, thus completing the interaction between the transmission rod 5 and the transmission block 6.

[0041] It should be understood that during the operation of the device, the upper end of the transmission rod 5 will rotate relative to the transmission block 6, but the rotation angle is small and will not cause the first disassembly groove 18 to move to the position of the first disassembly block 17. Therefore, the cooperation state between the transmission rod 5 and the transmission block 6 can be guaranteed during the operation of the device.

[0042] It should also be noted that the transmission block 6 is also provided with a weight reduction groove.

[0043] Furthermore, by Figures 1 to 4 As shown, in order to increase the impact resistance of the device, a second torsion spring 23 is provided on the front side of the transmission block 6, and the two ends of the second torsion spring 23 are rotatably connected to the transmission block 6 and the headrest frame 2 respectively.

[0044] In use, the second torsion spring 23 is similar to the first torsion spring 13, with its two ends connected to the transmission block 6 and the headrest frame 2 respectively. When the transmission block 6 rotates, it can store force for the second torsion spring 23.

[0045] It should be noted that the second torsion spring 23 serves two purposes. First, a certain gap exists between the first actuating block 14 and the second actuating block 15. During the pulling of the pull rope 8, the first torsion spring 13 first stores force, and then the first torsion spring 13 and the second torsion spring 23 store force together. Thus, when the triggering mechanism is manually operated, the force at both ends can be clearly felt, thereby reducing the risk of accidental activation. Second, when one of the first torsion spring 13 or the second torsion spring 23 fails due to wear, impact, or other reasons, the reset between the power disc 10 and the transmission block 6 can still operate normally. This serves as a redundant reset setting, increasing the device's resilience.

[0046] Furthermore, by Figures 1 to 4 As shown, in order to facilitate assembly by the staff, the headrest frame 2 includes a front headrest 24 and a rear headrest 25, and the front headrest 24 and the rear headrest 25 are detachably connected.

[0047] In use, the front headrest 24 and the rear headrest 25 are detachably connected by bolts.

[0048] Furthermore, by Figures 1 to 4 As shown, in order to enable the headrest to fold automatically, a third torsion spring 26 is provided on each of the left and right sides of the lock body 3, and both ends of each third torsion spring 26 are connected to the lock body 3 and the headrest frame 2 respectively.

[0049] When in use, when the latch 4 and the lock body 3 are engaged, the third torsion spring 26 is in a continuously charged state. When the latch 4 and the lock body 3 are disengaged, the third torsion spring 26 will drive the headrest frame 2 to flip forward and fold.

[0050] Furthermore, by Figures 1 to 4 As shown, in order to facilitate the assembly by the staff, a positioning rod 27 is fixedly connected to the front of the locking tongue 4. The locking tongue 4 is rotatably connected to the headrest frame 2 through the positioning rod 27. A connecting groove 28 is opened on the upper side of the locking tongue 4, and a connecting rod 29 that matches the connecting groove 28 is fixedly connected to the lower side of the transmission rod 5.

[0051] It should be noted that in this embodiment, an extension rod is fixedly connected to each of the left and right sides of the lock body 3. One end of each third torsion spring 26 is engaged with the corresponding extension rod, and the end of each third torsion spring 26 away from the extension rod is engaged with the positioning rod 27. Since the extension rod and the positioning rod 27 are both metal supports, their strength is higher than that of the headrest frame 2, thus improving the overall stability of the device.

[0052] During use, since the transmission rod 5 rotates relative to the transmission block 6 during the cooperation process between the transmission rod 5 and the transmission block 6, the positioning rod 27 can be directly engaged with the connecting groove 28 during this rotation process, thus completing the assembly between the transmission rod 5 and the locking tongue 4.

[0053] In this embodiment, an elastic piece is provided at the right end of the connecting rod 29, and a gap is provided between the elastic piece and the connecting rod 29. The elastic piece is made of wear-resistant plastic and has a certain elasticity. During the process of the connecting rod 29 moving with the transmission rod 5, the right end of the connecting rod 29 and the elastic piece will pass through the connecting groove 28. When the elastic piece has completely passed through the connecting groove 28, it will pop outward under its own elastic deformation. At this time, the gap will expand, and then the connecting rod 29 will engage with the connecting groove 28 under the action of the elastic piece, thus completing the cooperation between the transmission rod 5 and the locking tongue 4.

[0054] It should be noted that since the rotating groove 16 is located in the middle of the transmission block 6, that is, directly to the right of the rotation center of the transmission block 6, its displacement in the left and right directions during the rotation of the transmission block 6 is much smaller than its displacement in the vertical direction. In addition, under the action of the elastic plate, the cooperation between the connecting rod 29 and the connecting groove 28 also allows for a certain angular offset between the two. Therefore, the rotation process of the transmission block 6 will not affect the stability of the cooperation between the transmission rod 5 and the locking tongue 4.

[0055] In addition, to facilitate the assembly of the transmission rod 5, an operating block is slidably provided on the rear side of the lower part of the transmission rod 5, so that the operator can easily move the transmission rod 5 to engage with the locking tongue 4.

[0056] When this invention is in use, firstly, when the locking tongue 4 and the locking body 3 cooperate with each other, their interaction prevents the headrest frame 2 from rotating relative to the fixed rod 1, thus limiting the angle of the headrest frame 2 relative to the seat frame, allowing it to provide normal head protection. When the seat back needs to be folded, the headrest frame 2 may interfere with the front seat. In this case, the transmission block 6 can be operated to rotate. During the rotation of the transmission block 6, the upper side of the transmission rod 5 will move upward in a circular motion, which in turn will cause the lower side of the transmission rod 5 to move upward as well, thereby causing the locking tongue 4 to rotate. This will disengage the locking tongue 4 from the locking body 3. Since the locking body 3 is fixed relative to the fixed rod 1, the locking tongue 4 and the headrest frame 2 can rotate forward relative to the upper part of the fixed rod 1, thus completing the folding action of the headrest. When the headrest needs to be reset, the headrest frame 2 can be directly pulled upward. At this time, the locking tongue 4 will cooperate with the locking body 3 again, thereby limiting the position of the headrest frame 2 relative to the seat frame.

[0057] This utility model features a novel structure, ingenious design, and simple and convenient operation. This design effectively facilitates the quick folding of the seat headrest, making the folding operation easier, increasing the stability of the device during use, making the force applied during the pulling process more even, and reducing the amount of force applied by increasing the length of the force arm. This also facilitates the installation of the device, increases its impact resistance, and makes it easier for workers to assemble.

[0058] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A folding headrest structure for a seat, comprising a fixing rod connected to a seat frame, wherein a headrest frame is rotatably connected to the upper side of the fixing rod, characterized in that: A lock body is fixedly connected to the middle of the fixed rod. The headrest frame has a rotating lock tongue inside. The lock tongue and the lock body cooperate to form a structure in which the headrest frame and the fixed rod are relatively fixed in position. A transmission rod is detachably connected to the upper side of the lock tongue. A rotatable transmission block is provided inside the headrest frame. The upper side of the transmission rod is rotatably connected to the transmission block. The rotation of the transmission block forms a structure in which the transmission rod drives the lock tongue to move up and down.

2. The folding headrest structure according to claim 1, characterized in that: The fixed rod has a through hole inside, and a guide line is fixedly connected inside the through hole. A pull rope is installed inside the guide line.

3. The folding headrest structure according to claim 2, characterized in that: The upper end of the pull rope is fixedly connected to a limiting block, and the inside of the headrest frame is rotatably connected to a power plate. A first cable management groove is opened in the middle of the power plate, and a limiting groove is opened in the middle of the power plate. The upper part of the pull rope passes around the first cable management groove so that the limiting block and the limiting groove cooperate with each other.

4. The folding headrest structure according to claim 3, characterized in that: The front side of the power plate is provided with a first torsion spring, and the two ends of the first torsion spring are respectively connected to the power plate and the headrest frame.

5. A folding headrest structure according to claim 3, characterized in that: A first actuating block is fixedly connected to the rear side of the power plate, and a second actuating block is fixedly connected to the side of the transmission block near the first actuating block. The upper side of the first actuating block abuts against the lower side of the second actuating block.

6. The folding headrest structure according to claim 1, characterized in that: The transmission block has a rotating groove in the middle, and two first disassembly blocks are fixedly connected inside the rotating groove. The upper side of the transmission rod has two first disassembly grooves that are adapted to the first disassembly blocks. A rotating rod is fixedly connected in the middle of the rotating groove. A rotating hole is opened in the middle of the upper side of the transmission rod. Two second disassembly blocks are fixedly connected to the outer side of the rotating rod. The rotating hole has two second disassembly grooves that are adapted to the second disassembly blocks.

7. The folding headrest structure according to claim 1, characterized in that: The front side of the transmission block is provided with a second torsion spring, and the two ends of the second torsion spring are rotatably connected to the transmission block and the headrest frame, respectively.

8. The folding headrest structure according to claim 1, characterized in that: The headrest frame includes a front headrest and a rear headrest, and the front headrest and the rear headrest are detachably connected.

9. A folding headrest structure according to claim 1, characterized in that: The lock body is provided with a third torsion spring on each of its left and right sides, and the two ends of each third torsion spring are respectively connected to the lock body and the headrest frame.

10. A folding headrest structure according to claim 1, characterized in that: A positioning rod is fixedly connected to the front of the latch, and the latch is rotatably connected to the headrest frame through the positioning rod. A connecting groove is provided on the upper side of the latch, and a connecting rod that matches the connecting groove is fixedly connected to the lower side of the transmission rod.

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