Indoor house door silent magnetic lock

Abstract

This utility model provides a silent magnetic lock for interior doors, including a lock box and a latch assembly. The lock box includes a base box and a cover plate. The base box includes a base plate and a first fixing plate, and the lock box is fixed to the door leaf by the first fixing plate. The first fixing plate has a first latch hole. The latch assembly includes a latch body, a first permanent magnet block, and a limiting member. The first permanent magnet block and the limiting member are respectively assembled on the latch body. The Young's modulus of the limiting member is smaller than that of the latch body. The latch body is assembled between the base plate and the cover plate. The limiting member includes a first limiting part protruding from the top of the latch body. When the top of the front end of the latch body extends out of the first latch hole, the first limiting part limits the rotation of the latch body by abutting against the inner wall of the first fixing plate. This utility model can reduce the noise generated by the latch body colliding with the lock box or latch.

Description

Technical Field

[0001] This utility model relates to the field of door locks, and more specifically, to a silent magnetic lock for indoor doors. Background Technology

[0002] Door locks are one of the most important components of a home security system, used to control entrances and exits and protect personal and property safety.

[0003] In traditional door locks, the bolt has a 45-degree bevel, which is protruded by a spring. When locking the door, force is required to push or pull the door, creating speed and impact that pushes the bolt back into the lock housing. This closing method generates significant impact on the door and frame, producing considerable noise and causing damage. Furthermore, the bolt protruding from the lock housing is unsightly and can easily snag clothing.

[0004] To avoid the above situation, magnetic locks were developed. These locks have a magnetic bolt. When the door is open, the bolt is hidden inside the lock housing. When the door is closed, a magnetic block in the strike plate attracts the bolt out, causing it to insert into the strike plate and lock the door. This eliminates the need to force the door to close. However, when the magnetic block attracts the bolt out of the lock housing, the bolt will collide with the lock housing or strike plate, producing considerable noise. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a silent magnetic lock for indoor doors, which addresses the issue of excessive noise generated when the bolt leaves the lock box in the aforementioned magnetic locks.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is to provide an indoor door silent magnetic lock, including a lock box and a lock tongue assembly. The lock box includes a bottom box and a cover plate. The bottom box includes a bottom plate and a first fixing plate vertically connected to the edge of the bottom plate. The lock box is fixed to the door leaf by the first fixing plate. The first fixing plate has a first lock tongue hole.

[0007] The latch assembly includes a latch body, a first permanent magnet block, and a limiting member. The first permanent magnet block and the limiting member are respectively mounted on the latch body. The Young's modulus of the limiting member is smaller than that of the latch body. The latch body is mounted between the base plate and the cover plate via a pin and is adjacent to the first latch hole on the first fixed plate. When the first permanent magnet block is attracted by magnetic force, it drives the latch body to rotate around the pin and causes the top front end of the latch body to extend out of the first latch hole on the first fixed plate. The limiting member includes a first limiting part protruding from the top end of the latch body. When the top front end of the latch body extends out of the first latch hole, the first limiting part limits the forward rotation of the latch body by abutting against the inner sidewall of the first fixed plate.

[0008] As a further improvement of this utility model, the limiting member includes a second limiting part protruding from the rear end of the latch body, and either the bottom plate or the cover plate has a limiting protrusion. When the front end of the latch body is retracted into the bottom box, the second limiting part limits the reverse rotation of the latch body by abutting against the limiting protrusion.

[0009] As a further improvement of this utility model, the latch body has a first mounting cavity adapted to the first permanent magnet block and a second mounting cavity adapted to the limiting member. The first mounting cavity is adjacent to the front end of the latch body, and the second mounting cavity is adjacent to the rear end of the latch body. The first permanent magnet block is installed in the first mounting cavity, and the limiting member is installed in the second mounting cavity.

[0010] As a further improvement of this utility model, the first mounting cavity and the second mounting cavity are connected.

[0011] The rear end face of the latch body has a first opening, and the first permanent magnet block is installed into the first mounting cavity through the first opening; the top face of the latch body has a second opening, the limiting member is inserted into the second mounting cavity through the first opening, and the first limiting part extends to the top face of the latch body through the second opening.

[0012] As a further improvement of this utility model, the two side walls of the second mounting cavity perpendicular to the thickness direction of the lock box are respectively provided with assembly holes;

[0013] The limiting component includes a limiting body, a first limiting part connected to the top of the limiting body, and a second limiting part connected to the rear of the limiting body; the limiting body has two sidewalls perpendicular to the thickness direction of the lock box with protruding fixing shafts, and when the limiting component is installed on the lock tongue body, the two fixing shafts are respectively embedded into two assembly holes, and the first limiting part is engaged with the second opening.

[0014] As a further improvement of this utility model, the limiting body is in the shape of a "7", and the two fixed axes are respectively far away from the top of the limiting body; the dimension of the first limiting part in the lock box thickness direction is smaller than the dimension of the limiting body in the lock box thickness direction, and the dimension of the second limiting part in the lock box thickness direction is larger than the dimension of the lock tongue body in the lock box thickness direction.

[0015] As a further improvement of this utility model, the two side walls of the first mounting cavity perpendicular to the thickness direction of the lock box are respectively provided with elastic clips, and the first permanent magnet block is limited in the first mounting cavity by the two elastic clips.

[0016] As a further improvement of this utility model, the side of the first limiting part facing the front end of the latch body is comb-shaped.

[0017] As a further improvement of this utility model, the silent magnetic lock for indoor doors includes a latch box, which includes a latch box body, a second permanent magnet block, and a latch sleeve made of elastic material. The latch box body has a third mounting cavity and a latch groove that is adapted to the front end top of the latch body and adjacent to the third mounting cavity. The second permanent magnet block is installed in the third mounting cavity. The latch sleeve includes buffer layers that are respectively attached to the side wall and bottom wall of the latch groove, and the thickness of the buffer layer is 0.5-2mm.

[0018] As a further improvement of this utility model, the buckle box includes a second fixing plate, and the buckle box is fixed to the door frame through the second fixing plate; the second fixing plate has a second locking tongue hole, and the buckle box body is fixed to the second fixing plate in such a way that the opening of the locking tongue groove is opposite to the second locking tongue hole;

[0019] The locking tongue sleeve includes a protruding edge, and when the buckle box body is fixed to the second fixing plate, the protruding edge is clamped between the buckle box body and the second fixing plate.

[0020] The present invention has the following beneficial effects: by assembling a limiting member with a relatively small Young's modulus on the main body of the lock tongue, and by having the first limiting part on the limiting member abut against the inner side wall of the first fixing plate when the main body of the lock tongue extends out of the first lock tongue hole, the rotation of the main body of the lock tongue is limited, thereby reducing the noise generated by the main body of the lock tongue colliding with the lock box or the buckle box. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the silent magnetic lock for indoor doors provided in an embodiment of this utility model.

[0022] Figure 2 This is an exploded structural diagram of the silent magnetic retractable latch assembly for an indoor door provided in this embodiment of the utility model.

[0023] Figure 3 This is a schematic diagram showing the top of the front end of the latch body extending out of the latch hole in the silent magnetic lock for indoor doors provided in this embodiment of the utility model.

[0024] Figure 4 This is a schematic diagram of the bolt body retracting into the lock box in the silent magnetic lock for indoor doors provided in this embodiment of the utility model.

[0025] Figure 5 This is a schematic diagram of the latch box of the silent magnetic lock for indoor doors provided in this embodiment of the utility model.

[0026] Figure 6This is an exploded structural diagram of the snap box in the silent magnetic lock for indoor doors provided in this embodiment of the utility model. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0028] like Figure 1 , Figure 2 The diagram shows the structure of a silent magnetic lock for interior doors provided in this embodiment of the invention. This silent magnetic lock can be installed on an interior door to lock and open it. The silent magnetic lock for interior doors in this embodiment includes a lock box 10, a latch assembly 20, and a snap box 30. The lock box 10 is installed on the door leaf, the snap box 30 is installed on the door frame, and the latch assembly 20 is installed inside the lock box 10. When the door leaf is closed (e.g., when the door leaf is rotated to the same plane as the door frame), a portion of the latch assembly 20 extends into the snap box 30 to lock the door leaf.

[0029] The lock box 10 can be generally rectangular in shape and includes a base box and a cover plate. The cover plate is fastened to the base box and forms a cavity for assembling the latch assembly 20, etc. The base box includes a base plate 11 and a first fixing plate 12, wherein the first fixing plate 12 is vertically connected to the edge of the base plate 11, and the lock box 10 is fixed to the door leaf by the first fixing plate 12. The first fixing plate 12 has a first latch hole. In addition to the edge where the first fixing plate 12 is located, the other edges of the base plate 11 also have vertically connected protruding edges. Those skilled in the art will understand that the lock box 10 can adopt a conventional structure in the art, which will not be described in detail here.

[0030] The latch assembly 20 includes a latch body 21, a first permanent magnet block 22, and a limiting member 23. The first permanent magnet block 22 and the limiting member 23 are respectively assembled on the latch body 21, and the Young's modulus of the limiting member 23 is less than that of the latch body 21, that is, the stiffness of the limiting member 23 is less than that of the latch body 21. Specifically, the latch body 21 can be made of hard materials such as metal or engineering plastics (e.g., Young's modulus greater than 2000 MPa), while the limiting member 23 can be made of elastic materials such as silicone (e.g., Young's modulus less than 1000 MPa). Similar to existing magnetic locks, since the first permanent magnet block 22 is assembled inside the latch body 21, in order to ensure that the magnetic field of the first permanent magnet block 22 is not shielded, the front end of the latch body 21 (i.e., the side facing the first fixing plate 12) needs to be made of a non-ferromagnetic material.

[0031] The latch body 21 is assembled between the base plate 11 and the cover plate via pins 213, and is adjacent to the first latch hole on the first fixed plate 12. That is, the base plate 11 and the cover plate each have pin holes, and the two pins 213 are located on the surfaces of the latch body 21 facing the base plate 11 and the cover plate, respectively. In other words, the pins 213 are integral with the latch body 21. The latch body 21 is assembled between the base plate 11 and the cover plate by inserting the two pins 213 into the pin holes of the base plate 11 and the cover plate, respectively, and can rotate relative to the lock box 10. In practical applications, the pins 213 can also be independent of the latch body 21; for example, the pins 213 can pass through the latch body 21.

[0032] When the first permanent magnet block 22 is attracted by magnetic force (e.g., when the door is closed, the lock box 10 and the latch box 30 are opposite each other, and the first permanent magnet block 22 is attracted by the magnetic components inside the latch box 30), the first permanent magnet block 22 drives the latch body 21 to rotate around the pin 213, and causes the top front end of the latch body 21 to extend out of the first latch hole on the first fixing plate 12. The limiting member 23 includes a first limiting part 231 protruding from the top end of the latch body 21, and when the top front end of the latch body 21 extends out of the first latch hole, the first limiting part 231 limits the rotation of the latch body 21 by abutting against the inner sidewall of the first fixing plate 12, that is, when the latch body 21 is in the forward direction (e.g., ... Figure 3 During the counter-clockwise rotation, the first limiting part 231 impacts the first fixing plate 12, thereby preventing the bolt body 21 from continuing to rotate. Figure 3 As shown.

[0033] When the first permanent magnet block 22 is attracted by magnetic force, as the latch body 21 rotates, the distance between the first permanent magnet block 22 and the magnetic component attracting its rotation will decrease. Correspondingly, the force on the first permanent magnet block 22 will also increase, and the rotation of the latch body 21 will also accelerate. If the latch body 21 directly impacts the first fixed plate 12 or the latch box 30, it will cause significant noise and may damage the latch body 21 or the latch box 30. However, since the Young's modulus of the limiting component 23 is smaller than that of the latch body 21, when the first limiting component 23 impacts the first fixed plate 12, the first limiting component 23 can absorb kinetic energy through its deformation, thereby making the noise generated by the impact relatively small (compared to the noise generated by the rigid latch body 21 impacting the rigid first fixed plate 12).

[0034] The aforementioned silent magnetic lock for interior doors uses a limiting member 23 with a relatively small Young's modulus mounted on the main body 21 of the lock tongue. The first limiting part 231 on the limiting member 23 abuts against the inner wall of the first fixing plate 12 when the main body 21 of the lock tongue extends out of the first lock tongue hole, thereby limiting the rotation of the main body 21 of the lock tongue and reducing the noise generated by the lock tongue 21 colliding with the lock box 10 or the latch box 30.

[0035] Combination Figure 2 , Figure 4 As shown, in one embodiment of this utility model, the aforementioned limiting member 23 further includes a second limiting portion 232, which protrudes from the rear end of the latch body 21. Correspondingly, either the base plate 11 or the cover plate has a limiting protrusion 111, which is located between the latch body 21 and the first fixing plate 12. When the front end of the latch body 21 is retracted into the lock box 10, the second limiting portion 232 abuts against the limiting protrusion 111 to prevent the latch body 21 from retracting (e.g., ...). Figure 3 The clockwise rotation of the bolt body 21 is used to limit the movement, thereby preventing the rear end of the rigid bolt body 21 from directly impacting the limiting protrusion 111 and generating significant noise during the unlocking process.

[0036] Specifically, the aforementioned limiting protrusion 111 can be directly formed by stamping the base plate 11 or the cover plate (when the base plate 11 or the cover plate is made of metal material). This method is not only simple in structure, but also generally will not be damaged.

[0037] In one embodiment of this utility model, the latch body 21 has a first mounting cavity and a second mounting cavity. The shape and size of the first mounting cavity are adapted to the shape and size of the first permanent magnet block 22, and the shape and size of the second mounting cavity are adapted to the shape and size of the limiting member 23. The first mounting cavity is adjacent to the front end of the latch body 21, and the second mounting cavity is adjacent to the rear end of the latch body 21. The first permanent magnet block 22 is installed in the first mounting cavity of the latch body 21, and the limiting member 23 is installed in the second mounting cavity of the latch body 21.

[0038] In one embodiment of this utility model, the first mounting cavity and the second mounting cavity are connected. Correspondingly, the rear end face of the latch body 21 (i.e., the end face facing away from the first fixing plate 12) has a first opening 211, and the first permanent magnet block 22 is installed into the first mounting cavity via the first opening 211. The top end face of the latch body 21 has a second opening 212, and the limiting member 23 is inserted into the second mounting cavity via the first opening 211, with the first limiting portion 231 extending out to the top end face of the latch body 21 via the second opening 212. During the assembly of the latch assembly 20, the first permanent magnet block 22 is first inserted into the first mounting cavity of the latch body 21 via the first opening 211; after the first permanent magnet block 22 is installed in place, the limiting member 23 is then inserted into the second mounting cavity of the latch body 21 via the first opening 211. Since the first permanent magnet block 22 and the limiting member 23 are both installed into the bolt body 21 through the first opening 211, there is no need to open two separate openings in the bolt body 21, which makes the structure of the bolt body 21 simple and its strength relatively large.

[0039] In one embodiment of this utility model, the two sidewalls of the second mounting cavity perpendicular to the thickness direction of the lock box 10 (i.e., the sidewalls where the two pins 213 are located) each have mounting holes 215. Correspondingly, the limiting member 23 includes a limiting body 233, a first limiting part 231 connected to the top of the limiting body 233, and a second limiting part 232 connected to the rear of the limiting body 233. In particular, the limiting body 233, the first limiting part 231, and the second limiting part 232 can be an integral structure, for example, integrally injection molded. The shape and size of the second opening 212 on the latch body 21 are adapted to the shape and size of the root of the first limiting part 231 (i.e., the connection between the first limiting part 231 and the limiting body 233). Furthermore, the limiting body 233 has two sidewalls perpendicular to the thickness direction of the lock box 10, each with a protruding fixing shaft 2331. When the limiting member 23 is installed onto the lock tongue body 21, the two fixing shafts 2331 are respectively inserted into the two mounting holes 215, and the first limiting part 231 is engaged with the second opening 212. When installing the limiting member 23, the first limiting part 231 can be inserted into the top of the lock tongue body 21 through the first opening 211 and the second opening 212 first. Then, the other part of the limiting body 233 is inserted into the second mounting cavity through the first opening 211, and the two fixing shafts 2331 are respectively inserted into the two mounting holes 215. The above structure makes the assembly of the limiting member 23 relatively simple. Of course, in practical applications, the limiting member 23 may not have a fixing shaft 2331, but can be fixed to the lock tongue body 21 by screws or the like.

[0040] Specifically, the aforementioned limiting body 233 is shaped like a figure 7, with the two fixed shafts 2331 located away from the top of the limiting body 233. The dimension of the first limiting part 231 in the thickness direction of the lock box 10 is smaller than the dimension of the limiting body 233 in the thickness direction of the lock box 10. This structure helps to reduce the cross-sectional area of ​​the first limiting part 231, and helps to absorb the kinetic energy of the collision with the first fixed plate 12 through deformation, thereby reducing noise.

[0041] Furthermore, the side of the first limiting part 231 facing the front end of the latch body 21 (i.e., the side facing the first fixing plate 12) is comb-shaped. This structure facilitates the elastic deformation of the first limiting part 231 when subjected to force, thereby further reducing the noise from impacting the first fixing plate 12.

[0042] The dimension of the second limiting part 232 in the thickness direction of the lock box 10 is larger than the dimension of the lock tongue body 21 in the thickness direction of the lock box 10 (that is, the dimension of the second limiting part 232 in the thickness direction of the lock box 10 is larger than the dimension of the limiting body 233 in the thickness direction of the lock box 10). The above structure makes the limiting protrusion 111 on the base plate 11 and / or cover plate relatively small in size from the base plate 11 and / or cover plate.

[0043] Furthermore, the two sidewalls of the first mounting cavity of the latch body 21, perpendicular to the thickness direction of the lock box 10, each have elastic clips 214. The first permanent magnet block 22 is confined within the first mounting cavity by the two elastic clips 214 (for example, the two elastic clips 214 abut against the front end of the first permanent magnet block 22 facing away from the latch body 21), thus keeping the first permanent magnet block 22 stable within the latch body 21. Those skilled in the art will understand that the distance between the two elastic clips 214 in their natural state (i.e., without external force) is less than the dimension of the first permanent magnet block 22 in the thickness direction of the lock box 10. Moreover, the two elastic clips 214 can be formed by stamping the two sidewalls of the first mounting cavity.

[0044] Combination Figure 5 , Figure 6 As shown, in one embodiment of the present invention, the latch box 30 of the above-mentioned silent magnetic lock for indoor doors includes a latch box body 31, a second permanent magnet block 33, and a latch sleeve 34 made of elastic material (e.g., silicone). The latch box body 31 is provided with a third mounting cavity and a latch groove 311 that is adapted to the front end top of the latch body 21 and adjacent to the third mounting cavity. The second permanent magnet block 33 is installed in the third mounting cavity. The latch sleeve 34 includes a buffer layer 341 that is respectively attached to the side wall and bottom wall of the latch groove 311, and the thickness of the buffer layer 341 is 0.5-2mm. Those skilled in the art will understand that the polarity directions of the second permanent magnet block 33 in the latch body 31 and the first permanent magnet block 22 in the latch body 21 are opposite. Thus, after the door is closed, the second permanent magnet block 33 can attract the first permanent magnet block 22 through magnetic force, so that the front top of the latch body 21 is embedded into the latch groove 311 of the latch body 31. Furthermore, due to the presence of the latch sleeve 34, the kinetic energy of the collision between the latch body 21 and the latch body 31 can be absorbed, thereby reducing collision noise.

[0045] Specifically, the aforementioned latch box 30 also includes a second fixing plate 32, and the latch box 30 is fixed to the door frame via the second fixing plate 32; the second fixing plate 32 has a second latch hole 321, and the latch box body 31 is fixed to the second fixing plate 32 such that the opening of the latch groove 311 is opposite to the second latch hole 321. Correspondingly, the latch sleeve 34 includes a protruding edge 342, and when the latch box body 31 is fixed to the second fixing plate 32, the protruding edge 342 is clamped between the latch box body 31 and the second fixing plate 32, thereby ensuring that the latch sleeve 34 is stably fixed.

[0046] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A silent magnetic lock for a room door, characterized by, The lock box includes a lock box and a latch assembly. The lock box includes a base box and a cover plate. The base box includes a base plate and a first fixing plate perpendicularly connected to the edge of the base plate. The lock box is fixed to the door leaf by the first fixing plate. The first fixing plate has a first latch hole. The latch assembly includes a latch body, a first permanent magnet block, and a limiting member. The first permanent magnet block and the limiting member are respectively mounted on the latch body. The Young's modulus of the limiting member is smaller than that of the latch body. The latch body is mounted between the base plate and the cover plate via a pin and is adjacent to the first latch hole on the first fixed plate. When the first permanent magnet block is attracted by magnetic force, it drives the latch body to rotate around the pin and causes the top front end of the latch body to extend out of the first latch hole on the first fixed plate. The limiting member includes a first limiting part protruding from the top end of the latch body. When the top front end of the latch body extends out of the first latch hole, the first limiting part limits the forward rotation of the latch body by abutting against the inner sidewall of the first fixed plate.

2. The silent magnetic lock for interior doors according to claim 1, characterized in that, The limiting member includes a second limiting part protruding from the rear end of the latch body. Either the base plate or the cover plate has a limiting protrusion. When the front end of the latch body is retracted into the base box, the second limiting part limits the reverse rotation of the latch body by abutting against the limiting protrusion.

3. The silent magnetic lock for interior doors according to claim 2, characterized in that, The latch body has a first mounting cavity adapted to the first permanent magnet block and a second mounting cavity adapted to the limiting member. The first mounting cavity is adjacent to the front end of the latch body, and the second mounting cavity is adjacent to the rear end of the latch body. The first permanent magnet block is installed in the first mounting cavity, and the limiting member is installed in the second mounting cavity.

4. The silent magnetic lock for interior doors according to claim 3, characterized in that, The first mounting cavity and the second mounting cavity are connected. The rear end face of the latch body has a first opening, and the first permanent magnet block is installed into the first mounting cavity through the first opening; the top face of the latch body has a second opening, the limiting member is inserted into the second mounting cavity through the first opening, and the first limiting part extends to the top face of the latch body through the second opening.

5. The silent magnetic lock for interior doors according to claim 4, characterized in that, The two sidewalls of the second mounting cavity, which are perpendicular to the thickness direction of the lock box, each have mounting holes; The limiting component includes a limiting body, a first limiting part connected to the top of the limiting body, and a second limiting part connected to the rear of the limiting body; the limiting body has two sidewalls perpendicular to the thickness direction of the lock box with protruding fixing shafts, and when the limiting component is installed on the lock tongue body, the two fixing shafts are respectively embedded into two assembly holes, and the first limiting part is engaged with the second opening.

6. The silent magnetic lock for interior doors according to claim 5, characterized in that, The limiting body is 7-shaped, with two fixed axes respectively away from the top of the limiting body; the first limiting part is smaller in the lock box thickness direction than the limiting body in the lock box thickness direction, and the second limiting part is larger in the lock box thickness direction than the bolt body in the lock box thickness direction.

7. The silent magnetic lock for interior doors according to claim 4, characterized in that, The first mounting cavity has two sidewalls perpendicular to the thickness direction of the lock box, each with an elastic clip. The first permanent magnet block is limited within the first mounting cavity by the two elastic clips.

8. The silent magnetic lock for interior doors according to claim 1, characterized in that, The side of the first limiting part facing the front end of the latch body is comb-shaped.

9. The silent magnetic lock for interior doors according to any one of claims 1-8, characterized in that, The silent magnetic lock for interior doors includes a latch box, which comprises a latch box body, a second permanent magnet block, and a latch sleeve made of elastic material. The latch box body has a third mounting cavity and a latch groove that is adapted to the front top of the latch body and adjacent to the third mounting cavity. The second permanent magnet block is installed in the third mounting cavity. The latch sleeve includes buffer layers that are respectively attached to the side wall and bottom wall of the latch groove, and the thickness of the buffer layers is 0.5-2mm.

10. The silent magnetic lock for interior doors according to claim 9, characterized in that, The latch box includes a second fixing plate, and the latch box is fixed to the door frame through the second fixing plate; the second fixing plate has a second latch hole, and the latch box body is fixed to the second fixing plate with the opening of the latch groove facing the second latch hole; The locking tongue sleeve includes a protruding edge, and when the buckle box body is fixed to the second fixing plate, the protruding edge is clamped between the buckle box body and the second fixing plate.

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