Bolt assembly

Abstract

The utility model discloses a bolt assembly which comprises a pair of zipper belts, the opposite sides of the zipper belts are provided with mutually meshed zipper tooth rows, a bolt and a fixed pin are fixed at the tail ends of the zipper belts in a pulverized coal mode, and the zipper belts are further provided with two pullers which are arranged in opposite directions. The face, facing the plug pin, of the fixed pin is a positioning face. A limiting part is arranged on one side, far away from the tail end of the fixed pin, of the positioning surface; the face, facing the fixed pin, of the plug pin is a guide face, the guide face is provided with a containing part corresponding to the limiting part, the containing part is provided with a positioning groove with an opening facing the tail end of the plug pin, and the positioning groove is connected with the limiting part in a clamped mode. The tail end of the guide face is bent towards the outer side away from the positioning face to form a guide end, a guide groove extending from the tail end to the positioning groove is formed in the surface of the guide end, and the guide groove is sunken in the center line direction. The plug pin is inserted through instant strong force, the limiting part abuts against the guide groove, and smooth matched connection of the plug pin and the fixed pin is achieved.

Description

Technical Field

[0001] The utility model belongs to the field of zippers, and in particular relates to a latch assembly. Background Art

[0002] A zipper is a device used to connect two pieces of fabric. It consists of a series of interlocking teeth. By pulling the rod on the zipper head, the teeth engage or separate to open or close the zipper. Zipper tape is a zipper embedded in a tape. It is commonly found in clothing, bags and other products, and serves the purpose of connection and opening and closing. Zippers are usually made of durable materials such as metal, plastic or nylon. These materials need to have a certain degree of flexibility and wear resistance to ensure the long-term use and stable performance of the zipper. For the structural design and manufacturing process of the zipper, it is necessary to ensure that it can withstand various forces and pressures and maintain smooth operation during use. At the same time, the appearance, function and user experience of the zipper must be taken into consideration. Reasonable design and optimization are required to meet the requirements of different scenarios and needs. The zipper head in the zipper is an important part of the zipper system. The design of the latch generally takes into account the anti-slip and anti-slip properties, which improves the safety and convenience of use. However, the existing zipper design is prone to problems such as the insertion of the locking pin through the plug and the zipper tapes on both sides not being smoothly inserted for adaptation. Since the entrance is large when the plug is inserted through the Y-shaped channel of the zipper body assembly, the insertion force becomes difficult to control to avoid the plug being stuck. In addition, during the insertion of the plug and the adaptation of the locking pin, the internal concave and convex structures of the plug, the locking pin and the zipper body assembly are prone to form obstacles during the adaptation, resulting in jamming and poor insertion, resulting in the inability to quickly and smoothly complete the adaptation of the plug and the locking pin; there is even a need for repeated reinsertions to make the two adapt.

[0003] The Chinese patent with announcement number CN205321437U discloses a novel zipper plug-in, which utilizes a transverse card head to be embedded in the groove inside the zipper teeth, thereby preventing the plug-in from falling off from the zipper teeth, but does not solve the problem of smooth guidance.

[0004] Therefore, in view of the problems existing in the prior art, it is urgently necessary to provide a latch assembly to solve the problems existing in the prior art. Summary of the invention

[0005] In response to the problems in the related technology, the utility model proposes a latch pin assembly, including a latch pin and a fixing pin. A guide groove is provided at the end of the latch pin, and a concave surface is provided on the inclined section of the guide groove. By making the convex teeth of the fixing pin actively touch the concave surface and inserting the latch pin with great force, the latch pin and the fixing pin are instantly adapted to each other, thereby avoiding the problem of the latch pin getting stuck when being inserted, and achieving smooth pulling and closing of the zipper tape.

[0006] The utility model is achieved in this way:

[0007] A latch assembly comprises a pair of zipper tapes, mutually interlocking chain teeth are installed on opposite sides of the pair of zipper tapes, and latches and fixed pins are respectively fixed to the ends of the pair of zipper tapes, and a sliding puller body group is also provided on the zipper tapes; the puller body group comprises two pull heads arranged in opposite directions, and a Y-shaped chain closing channel is provided in the pull heads along the chain teeth direction, the puller body group is slidably installed on the fixed pin and the chain teeth of the zipper tape, the latch and the zipper tape are separated from the puller body group, and the installation with the puller body group and the fixed pin and the zipper tape is completed by continuously inserting the latch into the Y-shaped chain closing channel;

[0008] A stop block is provided at the end of the fixed pin, and the stop block abuts against the pull head to prevent the pull head from falling out; the side of the fixed pin facing the plug pin is a positioning surface, and a raised limiting portion is provided at the front end of the positioning surface close to the chain tooth row, and the limiting portion extends along the direction of the chain tooth row and is located at the midline position of the Y-shaped chain closing channel;

[0009] The side of the latch pin facing the fixed pin is a guiding surface, and a receiving portion corresponding to the limiting portion is provided at the front end of the guiding surface close to the chain tooth row, and the receiving portion is provided with a positioning groove opening toward the end of the latch pin, and the positioning groove and the limiting portion are mutually engaged; the end of the guiding surface is bent toward the outside away from the positioning surface to form a guiding end, and the surface of the guiding end is provided with a guiding groove extending from the end and toward the positioning groove, and the guiding groove is recessed along the center line direction, so that the latch pin will abut against the limiting portion when inserted into the Y-shaped chain channel.

[0010] Preferably, the guide groove includes a straight section and an inclined section, the inclined section is located at the end of the latch and is inclined in a direction away from the fixed pin, and a concave surface is provided on the inclined section; the concave surface is located at the end of the latch, and its length is one third to one half of the length of the longer side of the latch guide surface.

[0011] Specifically, when the latch is vigorously inserted into the Y-shaped chain-closing channel of the pull-body assembly, it can be ensured that the concave portion is fully in contact with the limiting portion of the fixed pin.

[0012] Preferably, the concave surface has a width in the middle greater than the width at both ends along the direction from the end of the latch to the accommodating portion, and a connecting surface is provided between the wider portion in the middle and the edge of the guide surface, and the connecting surface is located on the side close to the end of the latch.

[0013] Specifically, the connecting surface can play a better avoidance and auxiliary role, so that the limiting part can smoothly enter the guide groove, ensuring that the adaptation of the latch and the fixed pin is completed instantly.

[0014] Preferably, the limiting portion includes a recessed portion and a convex tooth located in the recessed portion; the inner side wall of the recessed portion is a slope structure inclined from the inside to the outside; the convex tooth extends from the middle of the recessed portion toward the end of the fixed pin, and the extended portion forms a slope from high to low and ends at the edge of the recessed portion.

[0015] Specifically, the slope of the inner side wall where the convex tooth intersects the recessed portion is relatively gentle, which can better adapt to the raised portion of the latch; the slope structure of the inner side wall of the recessed portion facilitates the raised portion to slide along the side wall and cooperate with the recessed portion.

[0016] Preferably, the accommodating portion is located on a side away from the end of the latch, the accommodating portion includes a U-shaped protrusion, the positioning groove is located in the protrusion; the protrusion is adapted to the recessed portion; the protruding tooth is adapted to the positioning groove.

[0017] Specifically, the protruding teeth and the positioning grooves are mainly used to achieve the positioning between the fixing pin and the plug pin. Through the cooperation of the raised portion and the recessed portion, the upper and lower positions of the plug pin after being inserted into the fixing pin can be guided and better fixed, while avoiding excessive insertion of the plug pin, causing the end of the plug pin to exceed the end of the fixing pin, resulting in the two being unable to fit together.

[0018] Preferably, the raised portion is a semi-enclosed structure formed by three facades and an open end, and the opening of the open end faces the end of the latch pin, and the positioning groove is connected to the straight section of the guide groove.

[0019] Specifically, the convex teeth first contact the concave surface and enter the positioning groove through the straight section of the guide groove.

[0020] Preferably, a shallow groove is provided in the straight section of the guide groove, and two ends of the shallow groove are respectively connected to the positioning groove and the concave surface; the width of the shallow groove gradually increases as it extends toward the concave surface.

[0021] Specifically, the width of the shallow groove near the concave surface is greater than the width of the shallow groove near the positioning groove, and the overall shape is trumpet-shaped, which is convenient for better guiding the protruding tooth through the shallow groove into the positioning groove, achieving the effect of instantly completing the adaptation of the latch and the fixing pin.

[0022] Preferably, the exterior facade opposite to the opening end is the front facade, and the two exterior facades connected to the opening end are side facades, the front facade and the side facades are perpendicular to each other; the side facades extend toward the opening end, and their heights gradually decrease; the side of the front facade away from the end of the pin forms a plurality of transition surfaces inclined outward.

[0023] Specifically, the transition surface includes a transition inclined surface and a transition arc surface, and the transition arc surface is located on a side close to the end of the latch pin;

[0024] Part of the side elevation structure extends to the straight section. The high-to-low side elevation structure can avoid obstruction when the protruding teeth enter the positioning groove, forming a smooth transition line. When the bolt and the fixed pin are pulled together by the pull body assembly, the bolt can be tilted and moved closer to the fixed pin as a whole, so that the accommodating part and the limiting part can be flexibly adapted.

[0025] The design of the transition surface on the outside of the front facade is similar to the design purpose of the inclined structure of the side facade, which facilitates the pin and the fixed pin to have a fine-tunable activity space when they are connected through the positioning groove and the convex teeth, thereby achieving a better guiding adaptation effect.

[0026] Preferably, an L-shaped protrusion and an inclined portion are sequentially provided extending from the limiting portion toward the end of the latch pin. The inclined portion is located at the end of the fixed pin and is inclined in a direction away from the latch pin.

[0027] Specifically, the ends of the latch and the fixing pin are inclined away from each other, which can avoid obstruction of the limit portion when the latch is inserted, and at the same time is more flexible during adaptation and has room for fine-tuning; the L-shaped protrusion can play an auxiliary guiding role.

[0028] Preferably, a limiting groove is provided on the side away from the end of the latch pin, and a limiting block adapted to the limiting groove is provided on the side away from the end of the fixed pin;

[0029] The slider is provided with a stop portion adapted to the stop block, and the stop block abuts against the stop portion to prevent the slider from falling out.

[0030] Specifically, the limit groove and the limit block can play an auxiliary fixing role after the convex teeth and the positioning groove are matched and connected. The limit block blocks the limit groove to prevent the pin from moving back out of the positioning pin, that is, to prevent a large relative position movement between the pin and the positioning pin, so that the zipper tape can be smoothly pulled and closed.

[0031] The stopper is to prevent the zipper assembly from sliding off the end of the zipper tape.

[0032] The two sliders form a slider body group, which can realize the closing and closing of the zipper tape as a whole, and a single slider can also close and close the zipper tape from both ends of the zipper tape respectively; the zipper tape between the two sliders is always in a closed state.

[0033] Compared with the prior art, the utility model achieves the following beneficial effects:

[0034] The utility model provides a latch assembly, comprising a latch and a fixed pin, wherein a receiving portion and a guiding groove are arranged on a guiding surface of the latch, the guiding groove comprises a straight section and an inclined section, and a concave surface is arranged on the inclined section, and when the concave surface is actively brought into contact with the latch and the latch can be inserted into a Y-shaped chain-closing channel of a zipper body assembly with great force, the convex teeth are positioned in the concave surface due to the great force, and the adaptation of the latch and the fixed pin is instantly completed through the guiding groove, thereby avoiding the problem that the latch is stuck when inserted into the fixed pin, and the insertion force is difficult to control and the insertion of the latch is not smooth; the structural design of the inclined section and the inclined portion of the latch and the fixed pin reduces internal obstruction during adaptation, and the concave surface of the inclined section ensures its stability and maximum force, so that the greater the insertion force of the latch, the easier it is to be guided to slide correctly, thereby realizing smooth closing and pulling of the zipper tape. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a product schematic diagram of a latch assembly in an embodiment of the utility model;

[0036] Figure 2 This is one of the schematic diagrams of the latch structure of a latch assembly in an embodiment of the utility model;

[0037] Figure 3 This is a second schematic diagram of a latch structure of a latch assembly in an embodiment of the utility model;

[0038] Figure 4 This is one of the schematic diagrams of the fixed pin structure of a latch assembly in an embodiment of the utility model;

[0039] Figure 5 This is a second schematic diagram of a fixed pin structure of a latch assembly in an embodiment of the utility model;

[0040] Figure 6 This is a schematic diagram of a pull head structure of a latch assembly in an embodiment of the utility model;

[0041] Figure 7 This is one of the state diagrams of the process of matching between a latch pin and a fixed pin of a latch pin assembly in an embodiment of the utility model;

[0042] Figure 8 This is a second state diagram of the process of matching a latch pin and a fixed pin of a latch pin assembly in an embodiment of the present utility model;

[0043] Fig. 9 This is the third state diagram of the adaptation process between the latch pin and the fixed pin of a latch pin assembly in an embodiment of the utility model.

[0044] Reference numerals:

[0045] 101, latch; 102, accommodating portion; 103, guiding groove; 104, protruding portion; 105, positioning groove; 106, opening end; 107, side elevation; 108, front elevation; 109, transition slope; 110, transition arc surface; 111, shallow groove; 112, connecting surface; 113, limiting groove; 114, concave surface; 115, guiding end;

[0046] 201, fixed pin; 202, limiting portion; 203, recessed portion; 204, convex teeth; 205, slope; 206, limiting block; 207, inclined portion; 208, L-shaped convex block; 209, stop block;

[0047] 301. Puller assembly; 302. Slider head; 303. Stop portion; 304. Y-shaped chain channel. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0049] Example:

[0050] like Figures 1 to 9 , a latch assembly, comprising a pair of zipper tapes, mutually interlocking chain teeth are installed on opposite sides of the pair of zipper tapes, and latches 101 and fixed pins 201 are respectively fixed to the ends of the pair of zipper tapes, and a sliding body puller group 301 is also provided on the zipper tape; the body puller group 301 comprises two pull heads 302 arranged in opposite directions, and a Y-shaped chain closing channel 304 is provided in the pull heads 302 along the chain teeth direction, the body puller group 301 is slidably installed on the fixed pin 201 and the chain teeth of the zipper tape, the latch 101 and the zipper tape are separated from the body puller group 301, and the latch 101 is continuously inserted into the Y-shaped chain closing channel 304 to complete the installation with the body puller group 301 and the fixed pin 201 and the zipper tape;

[0051] A stop block 209 is provided at the end of the fixing pin 201, and the stop block 209 abuts against the pull head 302 to prevent the pull head 302 from falling out; the side of the fixing pin 201 facing the latch 101 is a positioning surface, and a raised limiting portion 202 is provided at the front end of the positioning surface close to the chain tooth row, and the limiting portion 202 extends along the direction of the chain tooth row and is located at the midline position of the Y-shaped chain closing channel 304;

[0052] The side of the latch 101 facing the fixed pin 201 is a guiding surface, and a receiving portion 102 corresponding to the limiting portion 202 is provided at the front end of the guiding surface close to the chain tooth row, and the receiving portion 102 is provided with a positioning groove 105 opening toward the end of the latch 101, and the positioning groove 105 and the limiting portion 202 are mutually engaged; the end of the guiding surface is bent toward the outside away from the positioning surface to form a guiding end 115, and the surface of the guiding end 115 is provided with a guiding groove 103 extending from the end and toward the positioning groove 105, and the guiding groove 103 is recessed along the center line direction, so that when the latch 101 is inserted into the Y-shaped chain channel 304, it will abut against the limiting portion 202.

[0053] The guide groove 103 includes a straight section and an inclined section. The inclined section is located at the end of the latch 101 and is inclined in a direction away from the fixed pin 201. A concave surface 114 is provided on the inclined section. The concave surface 114 is located at the end of the latch 101, and its length is one third to one half of the length of the longer side of the guide surface of the latch 101.

[0054] When the latch pin 101 is inserted into the Y-shaped chain channel 304 of the pull body assembly 301 with great force, it can be ensured that a portion of the concave surface 114 is fully in contact with the limiting portion 202 of the fixed pin 201 .

[0055] The concave surface 114 is along the direction from the end of the latch 101 to the accommodating portion 102 , and its width in the middle is greater than the width at both ends. A connecting surface 112 is provided between the wider portion in the middle and the edge of the guide surface, and the connecting surface 112 is located on the side close to the end of the latch 101 .

[0056] The connecting surface 112 can play a good avoiding and auxiliary role, so that the limiting portion 202 can smoothly enter the guide groove, ensuring that the adaptation of the latch 101 and the fixing pin 201 is completed instantly.

[0057] The limiting portion 202 includes a recessed portion 203 and a convex tooth 204 located in the recessed portion 203; the inner side wall of the recessed portion 203 is a slope structure inclined from the inside to the outside; the convex tooth 204 extends from the middle of the recessed portion 203 toward the end of the fixed pin 201, and its extended part forms a slope 205 from high to low and ends at the edge of the recessed portion 203.

[0058] The slope of the inner wall where the protruding tooth 204 intersects the recessed portion 203 is relatively gentle, which can better adapt to the protruding portion 104 of the latch 101; the slope structure of the inner wall of the recessed portion 203 facilitates the protruding portion 104 to slide in along the side wall and cooperate with the recessed portion 203.

[0059] The accommodating portion 102 is located at a side away from the end of the latch 101 , and includes a U-shaped protrusion 104 , and the positioning groove 105 is located in the protrusion 104 ; the protrusion 104 is adapted to the recess 203 ; and the protruding tooth 204 is adapted to the positioning groove 105 .

[0060] The protruding teeth 204 and the positioning grooves 105 are mainly used to realize the positioning between the fixing pin 201 and the plug pin 101. Through the cooperation between the raised portion 104 and the recessed portion 203, the upper and lower positions of the plug pin 101 after being inserted into the fixing pin 201 can be guided and better fixed, while avoiding excessive insertion of the plug pin 101, causing the end of the plug pin 101 to exceed the end of the fixing pin 201, resulting in the inability to fit the two.

[0061] The protrusion 104 is a semi-enclosed structure formed by three facades and an open end 106 . The opening of the open end 106 faces the distal end of the latch 101 , and the positioning groove 105 is connected to the straight section of the guide groove 103 .

[0062] The protruding teeth 204 first contact the concave surface 114 and enter into the positioning groove 105 through the straight section of the guiding groove 103 .

[0063] The exterior facade opposite to the opening end 106 is the front facade 108, and the two exterior facades connected to the opening end 106 are the side facades 107. The front facade 108 and the side facades 107 are perpendicular to each other; the side facades 107 extend toward the opening end 106, and their height gradually decreases; the side of the front facade 108 away from the end of the latch 101 forms a plurality of transition surfaces inclined outward.

[0064] The transition surface includes a transition inclined surface 109 and a transition arc surface 110, and the transition arc surface 110 is located on a side close to the end of the latch 101;

[0065] Part of the structure of the side elevation 107 extends to the straight section. The high-to-low side elevation 107 structure can avoid the formation of obstacles when the protruding teeth 204 enter the positioning groove 105, forming a smooth transition line, and when the latch 101 and the fixed pin 201 are pulled together by the pull body assembly 301, the latch 101 can be tilted and moved closer to the fixed pin 201 as a whole, so that the accommodating portion 102 and the limiting portion 202 can be flexibly adapted;

[0066] The design of the transition surface on the outside of the front facade 108 is similar to the design purpose of the inclined structure of the side facade 107, which facilitates the pin 101 and the fixed pin 201 to have a fine-tunable activity space when they are adapted to be connected through the positioning groove 105 and the protruding tooth 204, thereby achieving a better guiding adaptation effect.

[0067] A shallow groove 111 is provided in the straight section of the guide groove 103 , and two ends of the shallow groove 111 are respectively connected to the positioning groove 105 and the concave surface 114 ; the width of the shallow groove 111 gradually increases as it extends toward the concave surface 114 .

[0068] The width of the shallow groove 111 near the concave surface 114 is greater than the width near the positioning groove 105. The overall shape is trumpet-shaped, which is convenient for better guiding the protruding tooth 204 through the shallow groove 111 into the positioning groove 105, so as to achieve the effect of instantly completing the adaptation of the latch 101 and the fixing pin 201.

[0069] Extending from the limiting portion 202 toward the end of the latch 101 , an L-shaped protrusion 208 and an inclined portion 207 are sequentially provided. The inclined portion 207 is located at the end of the fixing pin 201 and is inclined in a direction away from the latch 101 .

[0070] The ends of the latch 101 and the fixing pin 201 are both inclined away from each other, which can avoid blocking the limit portion 202 when the latch 101 is inserted, and at the same time, it is more flexible during adaptation and has room for fine-tuning; the L-shaped protrusion 208 can play an auxiliary guiding role.

[0071] A limiting groove 113 is provided on a side away from the end of the latch pin 101, and a limiting block 206 adapted to the limiting groove 113 is provided on a side away from the end of the fixed pin 201;

[0072] The slider 302 is provided with a stop portion 303 adapted to the stop block 209 , and the stop block 209 abuts against the stop portion 303 to prevent the slider 302 from falling out.

[0073] The limiting groove 113 and the limiting block 206 can play an auxiliary fixing role after the protruding tooth 204 and the positioning groove 105 are matched and connected. The limiting block 206 blocks the limiting groove 113 to prevent the latch pin 101 from moving back out of the fixing pin 201, that is, to prevent a large relative position movement between the latch pin 101 and the fixing pin 201, so that the zipper tape can be smoothly pulled and closed.

[0074] The stop block 209 is used to prevent the zipper assembly 301 from sliding out of the end of the zipper tape.

[0075] The two sliders 302 form the pull body assembly 301, which can realize the closing and closing of the zipper tape as a whole. The single slider 302 can also close the zipper tape from both ends of the zipper tape respectively; the zipper tape between the two sliders 302 is always in a closed state.

[0076] The utility model provides a latch pin assembly, wherein the latch pin 101 is inserted into the zipper body assembly 301, the convex teeth 204 of the fixing pin 201 contact the concave surface 114 of the inclined section at the end of the latch pin 101, the latch pin 101 is inserted instantly with great force, the convex teeth 204 are guided by the guide groove 103 to be inserted into the positioning groove 105 of the latch pin 101, and the latch pin 101 and the fixing pin 201 are smoothly matched and connected instantly, thereby smoothly pulling and closing the zipper tape.

[0077] According to the disclosure and teaching of the above specification, the technicians in the field of the utility model can also change and modify the above implementation. Therefore, the utility model is not limited to the specific implementation methods disclosed and described above, and some modifications and changes to the utility model should also fall within the scope of protection of the claims of the utility model. In addition, although some specific terms are used in this specification, these terms are only for the convenience of explanation and do not constitute any limitation to the utility model.

Claims

1. A latch assembly, comprising a pair of zipper tapes, mutually interlocking chain teeth rows are installed on opposite sides of the pair of zipper tapes, and latches and fixed pins are respectively fixed to the ends of the pair of zipper tapes, and a sliding pull body group is also provided on the zipper tape; the pull body group comprises two pull heads arranged in opposite directions, and a Y-shaped chain closing channel is provided in the pull heads along the chain tooth row direction, the pull body group is slidably installed on the fixed pin and the chain tooth row of the zipper tape, the latch and the zipper tape are separated from the pull body group, and the installation with the pull body group and the fixed pin and the zipper tape is completed by continuously inserting the latch into the Y-shaped chain closing channel; it is characterized in that A stop block is provided at the end of the fixed pin, and the stop block abuts against the pull head to prevent the pull head from falling out; the side of the fixed pin facing the plug pin is a positioning surface, and a raised limiting portion is provided at the front end of the positioning surface close to the chain tooth row, and the limiting portion extends along the direction of the chain tooth row and is located at the midline position of the Y-shaped chain closing channel; The side of the latch pin facing the fixed pin is a guiding surface, and a receiving portion corresponding to the limiting portion is provided at the front end of the guiding surface close to the chain tooth row, and the receiving portion is provided with a positioning groove opening toward the end of the latch pin, and the positioning groove and the limiting portion are mutually engaged; the end of the guiding surface is bent toward the outside away from the positioning surface to form a guiding end, and the surface of the guiding end is provided with a guiding groove extending from the end and toward the positioning groove, and the guiding groove is recessed along the center line direction, so that the latch pin will abut against the limiting portion when inserted into the Y-shaped chain channel.

2. A latch assembly according to claim 1, characterized in that: The guide groove includes a straight section and an inclined section, the inclined section is located at the end of the latch and is inclined in a direction away from the fixed pin, and a concave surface is provided on the inclined section; the concave surface is located at the end of the latch, and its length is one third to one half of the length of the longer side of the latch guide surface.

3. A latch assembly according to claim 2, characterized in that: The concave surface is along the direction from the end of the bolt to the accommodating portion, and its width in the middle is greater than the width at both ends. A connecting surface is provided between the wider part in the middle and the edge of the guide surface, and the connecting surface is located on the side close to the end of the bolt.

4. A latch assembly according to claim 1, characterized in that: The limiting portion includes a recessed portion and a convex tooth located in the recessed portion; the inner side wall of the recessed portion is a slope structure inclined from the inside to the outside; the convex tooth extends from the middle of the recessed portion toward the end of the fixed pin, and its extended part forms a slope from high to low and ends at the edge of the recessed portion.

5. A latch assembly according to claim 4, characterized in that: The accommodating portion is located at a side away from the end of the latch, and the accommodating portion includes a U-shaped protruding portion, and the positioning groove is located in the protruding portion; the protruding portion is adapted to the recessed portion; and the convex teeth are adapted to the positioning groove.

6. A latch assembly according to claim 5, characterized in that: The raised portion is a semi-enclosed structure formed by three facades and an open end, and the opening of the open end faces the end of the latch pin, and the positioning groove is connected to the straight section of the guide groove.

7. A latch assembly according to claim 6, characterized in that: A shallow groove is provided in the straight section of the guide groove, and two ends of the shallow groove are respectively connected to the positioning groove and the concave surface; the width of the shallow groove gradually increases as it extends toward the concave surface.

8. The latch assembly according to claim 6, characterized in that: The exterior facade opposite to the opening end is the front facade, and the two exterior facades connected to the opening end are side facades, the front facade and the side facades are perpendicular to each other; the side facades extend toward the opening end, and their heights gradually decrease; the side of the front facade away from the end of the latch forms a plurality of transition surfaces inclined outward.

9. The latch assembly according to claim 1, characterized in that: Extending from the limiting portion toward the end of the bolt, an L-shaped protrusion and an inclined portion are sequentially provided. The inclined portion is located at the end of the fixed pin and is inclined in a direction away from the bolt.

10. The latch assembly according to claim 1, characterized in that: A limiting groove is provided on one side away from the end of the latch pin, and a limiting block adapted to the limiting groove is provided on one side away from the end of the fixed pin; The slider is provided with a stop portion adapted to the stop block, and the stop block abuts against the stop portion to prevent the slider from falling out.

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