Latching tongue structure and lock comprising same

Abstract

The utility model discloses a lock tongue structure and including its lock. The lock tongue structure includes: the casing is used for setting in the upper side part or lower side part of sliding door body, and the casing is provided with the opening, the lock tongue is up and down slidingly arranged in the casing to be telescopic relative to the opening, the cover is slidably arranged in the casing, and the cover can be moved relative to the casing at the first position and the second position, when the cover is at the first position, the cover is at least partially located above the lock tongue to block the lock tongue and extend from the opening, when the cover is moved to the second position by the impact, the cover removes the block of lock tongue, and the lock tongue can extend from the opening. Thus, by setting movable cover, blocking the lock tongue to extend when the sliding door body is not moved in place, avoiding the collision of the lock tongue and the upper track or the outer wall of the lock box, eliminating the security risk, and, after the sliding door body is moved in place, the cover can timely remove the block of lock tongue, so that the lock tongue can normally extend to realize the locking function, ensuring that the basic use function of the lock is not affected.

Description

Technical Field

[0001] This utility model belongs to the technical field of door and window hardware accessories, specifically relating to a lock tongue structure and a lock including the same. Background Technology

[0002] The top lock in related technologies typically includes a lock box, a bolt, and a lock cylinder. The lock box is located on the upper (or lower) track, the bolt is located on the upper (or lower) side of the sliding door, and the lock cylinder is located on the sliding door and is connected to the bolt. Driven by the lock cylinder, the bolt can move up and down relative to the lock box. When the bolt extends and contacts the lock box, the sliding door is locked; when the bolt retracts and separates from the lock box, the sliding door is unlocked. The lock box and bolt of this top lock are located on the upper (or lower) side of the door system, allowing them to be removed from the user's view, thus improving the aesthetics of the door and window system. However, if the bolt extends prematurely due to accidental operation before the sliding door is fully in place, it may collide with the upper track or the outer wall of the lock box, posing a safety hazard. Utility Model Content

[0003] In order to overcome at least one of the defects described in the prior art, the present invention provides a latch structure and a lock including the latch, which aims to solve the safety hazard problem in the prior art where the latch extends due to misoperation and collides with the upper track or the outer wall of the lock box when the sliding door body is not moved into place.

[0004] The technical solution adopted by this utility model to solve its problem is: A latch structure includes: a housing for being disposed on the upper or lower side of a sliding door body, the housing having an opening; a latch slidably disposed on the housing to extend and retract relative to the opening; and a cover slidably disposed on the housing, the cover being movable relative to the housing at a first position and a second position; when the cover is in the first position, the cover is at least partially located above the latch to prevent the latch from extending out of the opening; when the cover is moved to the second position by a collision, the cover releases its obstruction of the latch, and the latch can extend out of the opening.

[0005] As an optional implementation, the latch structure further includes a reset member disposed between the cover and the housing; when the latch retracts and the cover is not impacted, the reset member is used to elastically drive the cover to reset from the second position to the first position.

[0006] As an optional implementation, the reset element is a horizontally arranged spring, the cover is provided with a first connecting groove, the housing is provided with a second connecting groove, one end of the spring is engaged with the first connecting groove, and the other end of the spring is engaged with the second connecting groove.

[0007] As an optional implementation, the upper side of the cover is provided with an impact block, which is used to collide with the first side wall of the lock box.

[0008] As an optional implementation, a guide structure is provided between the cover and the housing, the guide structure being used to guide the cover to slide horizontally relative to the housing.

[0009] As an optional implementation, the guide structure includes a sliding cavity disposed in the housing, and the cover is slidably disposed in the sliding cavity.

[0010] As an optional implementation, the guide structure further includes a first guide rib and a first guide groove that both extend horizontally, the first guide rib and the first guide groove being slidably engaged, one of the first guide rib and the first guide groove being disposed on the cover body, and the other being disposed on the side wall of the sliding cavity.

[0011] As an optional implementation, the first guide rib is disposed on the side wall of the sliding cavity, and the first guide groove is disposed on the cover; a second guide groove is formed between the first guide rib and the side wall of the sliding cavity, and a second guide rib is disposed on the side wall of the cover; the second guide rib and the second guide groove are slidably engaged, and the second guide rib is located below the first guide rib.

[0012] As an optional implementation, the guide structure further includes a slider and a groove, the slider being disposed on the side wall of the cover, and the groove being disposed horizontally on the upper side wall of the housing.

[0013] In addition, this utility model also provides a lock, including a latch structure as described in any of the above embodiments, and a lock box, the lock box being disposed on an upper track or a lower track, the lock box having a first side wall, the first side wall being used to strike the cover to move the cover to the second position; when the cover is in the second position, the latch can extend from the opening and contact the lock box to achieve locking.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: Firstly, by setting a movable cover, the latch is blocked from extending when the sliding door is not in place, thus avoiding collision between the latch and the upper track or the outer wall of the lock box and eliminating potential safety hazards.

[0015] Secondly, after the sliding door moves into place, the cover can promptly release its obstruction of the bolt, allowing the bolt to extend normally and achieve the locking function, thus ensuring that the basic functions of the lock are not affected.

[0016] Thirdly, the overall locking tongue structure is set on the upper or lower side of the sliding door, moving the locking tongue structure out of the user's sight, which can maintain the overall aesthetics of the door and window system and will not destroy the original aesthetic design due to the addition of a cover or other structures. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional structural diagram of the latch structure (with the cover in the first position) according to an embodiment of this application; Figure 2 This is an exploded view of the latch structure of an embodiment of this application from a first perspective; Figure 3 This is an exploded view of the latch structure of an embodiment of this application from a second perspective; Figure 4 This is a three-dimensional structural diagram of the lock (when the cover does not collide with the lock box) according to an embodiment of this application; Figure 5 This is a three-dimensional structural diagram of a lock (when the cover collides with the lock box and the bolt is not extended) according to an embodiment of this application; Figure 6 This is a three-dimensional structural diagram of a lock (when the cover collides with the lock box and the bolt extends) according to an embodiment of this application.

[0019] Explanation of key figure labels: 1. Housing; 11. Opening; 12. Second connecting groove; 13. Sliding cavity; 131. First guide rib; 132. Second guide groove; 14. Slide groove; 2. Locking tongue; 3. Cover; 31. Impact block; 32. First connecting groove; 33. First guide groove; 34. Second guide rib; 35. Sliding block; 4. Reset component; 5. Lock box; 51. First side wall; 52. Second side wall; 6. Transmission component; 7. Fastening screw. Detailed Implementation

[0020] 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.

[0021] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0022] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0023] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0024] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0025] The technical solution of this utility model will be further described below with reference to the embodiments and accompanying drawings.

[0026] Please see Figures 1 to 3 This application provides a latch structure, including a housing 1, a latch 2, and a cover 3. The housing 1 is disposed on the upper or lower side of a sliding door, and the housing 1 has an opening 11. The latch 2 is slidably disposed on the housing 1 to extend and retract relative to the opening 11. The cover 3 is slidably disposed on the housing 1, and the cover 3 is movable relative to the housing 1 in a first position and a second position. When the cover 3 is in the first position, the cover 3 is at least partially located above the latch 2 to prevent the latch 2 from extending out of the opening 11. For details, please refer to [reference needed]. Figure 1 and Figure 4 When the cover 3 moves to the second position due to a collision, the cover 3 releases its obstruction of the latch 2, allowing the latch 2 to extend from the opening 11. (See details in the original text.) Figure 5 and Figure 6 .

[0027] It is understandable that the opening 11 provides a channel for the extension and retraction of the bolt 2. When the bolt 2 extends out of the opening 11 and contacts the lock box 5, it can lock the sliding door. When the bolt 2 retracts and separates from the lock box 5, it can unlock the sliding door.

[0028] The latch structure provided in this application has three aspects: First, by providing a movable cover 3, the latch 2 is prevented from extending when the sliding door is not in position, thus avoiding collision between the latch 2 and the upper track or the outer wall of the lock box 5 and eliminating safety hazards. Second, after the sliding door is in position, the cover 3 can promptly release the obstruction of the latch 2, allowing the latch 2 to extend normally and perform the locking function, ensuring that the basic function of the lock is not affected. Third, the overall latch structure is located on the upper or lower side of the sliding door, moving the latch structure out of the user's sight, maintaining the overall aesthetics of the door and window system, and preventing the original aesthetic design from being damaged by the addition of the cover 3 or other structures.

[0029] like Figure 2 and Figure 3 As shown, in one embodiment, the latch structure further includes a reset member 4, which is disposed between the cover 3 and the housing 1. When the latch 2 retracts and the cover 3 is not impacted, the reset member 4 is used to elastically drive the cover 3 to reset from the second position to the first position. Thus, firstly, the automatic reset function of the reset member 4 simplifies the user's operation process. After unlocking the sliding door, the user does not need to manually reset the cover 3 to the first position; the reset member 4 automatically completes this action, reducing the user's operation steps and difficulty. Secondly, after the sliding door unlocks and the latch 2 retracts, the cover 3 promptly returns to the first position, re-blocking the latch 2. Even if a misoperation occurs subsequently, since the cover 3 is already in the blocking position, it can effectively prevent the latch 2 from accidentally extending, avoiding collisions between the latch 2 and the upper track or the outer wall of the lock box 5. This promptly and effectively eliminates safety hazards and provides reliable safety assurance for the use of the sliding door.

[0030] like Figure 2 and Figure 3As shown, in one embodiment, the reset element 4 is a horizontally arranged spring. The cover 3 is provided with a first connecting groove 32, and the housing 1 is provided with a second connecting groove 12. One end of the spring is engaged with the first connecting groove 32, and the other end of the spring is engaged with the second connecting groove 12. Thus, firstly, by using a horizontally arranged spring as the reset element 4, and by using the first connecting groove 32 on the cover 3 and the second connecting groove 12 on the housing 1 to engage and fix both ends of the spring, the spring's position in the equipment is stable, preventing displacement or loosening, thereby ensuring the stability and reliability of the entire structure during operation. Secondly, by using an engaging method to fix both ends of the spring in the connecting grooves of the cover 3 and the housing 1 respectively, the installation method is simple and easy, requiring no complex tools or operating steps, greatly shortening assembly time and improving production efficiency. At the same time, when maintenance or replacement of the spring is required, disassembly and installation can be carried out conveniently and quickly, reducing maintenance costs and difficulty. Thirdly, the horizontally arranged spring, combined with the snap-fit ​​structure of the connecting slot, not only meets the reset function requirements but also makes more rational use of the internal space of the equipment. This design avoids space waste or interference with other components caused by improper spring placement, making the overall structure of the equipment more compact.

[0031] It should be noted that in some other embodiments, the reset member 4 may also be, but is not limited to, elastic rubber or silicone. The choice can be made according to actual needs, and no single limitation is made here.

[0032] like Figure 1 , Figure 4 , Figure 5 and Figure 6As shown, in one embodiment, an impact block 31 protrudes from the upper side of the cover 3. The impact block 31 is used to collide with the first side wall 51 of the lock box 5. When the impact block 31 collides with the first side wall 51, the cover 3 moves to the second position. In this way, firstly, when the sliding door moves into place for locking operation, the impact block 31 protruding from the upper side of the cover 3 can accurately collide with the first side wall 51 of the lock box 5. This precise collision design avoids the situation where the cover 3 moves to the second position due to accidental slight contact. Only when the sliding door is truly close to the lock box 5 and reaches the appropriate locking position will the effective collision between the impact block 31 and the first side wall 51 trigger the movement of the cover 3, thereby ensuring that the bolt 2 can only extend at a safe and correct time, reducing the risk of the bolt 2 extending in the wrong position, and enhancing the safety and reliability of the entire lock structure during use. Secondly, the impact block 31 adopts a protruding design, which increases the contact area and force uniformity when colliding with the first side wall 51 of the lock box 5. Compared with point contact or small area contact collision methods, this design can disperse the collision force and reduce local stress concentration, thereby reducing the risk of damage to the cover 3 and related components due to frequent collisions, effectively improving the overall durability of the lock tongue structure, extending the service life of the product, and reducing maintenance and replacement costs.

[0033] like Figure 1 , Figure 2 and Figure 3 As shown, in one embodiment, a guide structure is provided between the cover 3 and the housing 1. This guide structure guides the cover 3 to slide horizontally relative to the housing 1. Thus, the guide structure provides precise path guidance for the horizontal sliding of the cover 3 relative to the housing 1. During the sliding process, it strictly limits the movement trajectory of the cover 3, ensuring it can only move along a preset horizontal direction, preventing the cover 3 from deviating, wobbling, or tilting. This ensures that the cover 3 accurately moves to the first and second positions each time, thereby precisely achieving the functions of blocking and releasing the latch 2, ensuring that the latch structure can work normally according to design requirements, and improving the accuracy and reliability of lock operation.

[0034] like Figure 1 , Figure 2 and Figure 3 As shown, in one embodiment, the guide structure includes a sliding cavity 13, which is disposed in the housing 1, and the cover 3 is slidably disposed in the sliding cavity 13. Thus, the shape of the sliding cavity 13 matches that of the cover 3, allowing the cover 3 to slide linearly only along the horizontal direction specified by the sliding cavity 13. This precise guiding effect prevents the cover 3 from deviating, wobbling, or moving irregularly during sliding, ensuring that the cover 3 accurately reaches the first and second positions each time.

[0035] like Figure 1 , Figure 2 and Figure 3 As shown, in one embodiment, the guide structure further includes a first guide rib 131 and a first guide groove 33, both extending horizontally. The first guide rib 131 and the first guide groove 33 are slidably engaged. One of the first guide rib 131 and the first guide groove 33 is disposed on the cover 3, and the other is disposed on the side wall of the sliding cavity 13. Thus, in the first aspect, the design of the first guide rib 131 and the first guide groove 33 extending horizontally and slidably engaged provides extremely precise linear guidance for the horizontal sliding of the cover 3 relative to the sliding cavity 13. During the movement of the cover 3, the first guide rib 131 is tightly embedded in the first guide groove 33, and the two constrain each other, so that the cover 3 can only move in a straight line strictly in the horizontal direction, effectively avoiding irregular movements such as offset, tilting or shaking of the cover 3. Secondly, the first guide rib 131 and the first guide groove 33 enhance the connection strength and structural stability between the cover 3 and the side wall of the sliding cavity 13. The first guide rib 131 usually has a certain strength and rigidity. After it is embedded in the first guide groove 33, it can withstand various external forces generated during the sliding of the cover 3, such as friction and collision forces. This structural design makes the connection between the cover 3 and the sliding cavity 13 more solid, reducing problems such as loosening, deformation or separation of parts caused by external forces or long-term use, thereby improving the stability and durability of the entire latch structure and extending the service life of the product.

[0036] like Figure 1 , Figure 2 and Figure 3 As shown, in one embodiment, a first guide rib 131 is disposed on the side wall of the sliding cavity 13, and a first guide groove 33 is disposed on the cover 3. A second guide groove 132 is formed between the first guide rib 131 and the side wall of the sliding cavity 13. A second guide rib 34 is disposed on the side wall of the cover 3. The second guide rib 34 and the second guide groove 132 are slidably engaged, and the second guide rib 34 is located below the first guide rib 131. Thus, the first guide rib 131 and the second guide rib 34 are respectively embedded in the first guide groove 33 and the second guide groove 132. This nested connection increases the contact area and bonding force between the cover 3 and the side wall of the sliding cavity 13. During the use of the lock, the cover 3 will be subjected to various external forces, such as the impact force and friction force when opening and closing the door. The double guide structure can better disperse these external forces, reduce local stress concentration, and prevent problems such as loosening and separation between the cover 3 and the sliding cavity 13, thereby improving the stability and durability of the entire lock tongue structure.

[0037] like Figure 1 , Figure 2 and Figure 3As shown, in one embodiment, the guide structure further includes a slider 35 and a groove 14. The slider 35 is disposed on the side wall of the cover 3, and the groove 14 is disposed horizontally on the upper side wall of the housing 1. Thus, firstly, the cooperation between the slider 35 and the groove 14 provides precise linear guidance for the movement of the cover 3 relative to the housing 1. The groove 14 is disposed horizontally on the upper side wall of the housing 1, and the slider 35 is fixed to the side wall of the cover 3. This structure ensures that the cover 3 can only move along the horizontal linear direction specified by the groove 14. During the operation of the sliding door, the cover 3 needs to accurately reach a specific position to realize the blocking or unblocking function of the latch 2. Precise linear guidance avoids irregular movements such as offset and swaying of the cover 3, ensuring that the latch structure can work stably and reliably according to the design requirements. Secondly, in addition to the horizontal linear guidance, the cooperation between the slider 35 and the slide groove 14 also constrains the vertical movement of the cover 3 to a certain extent. The slider 35 is embedded in the slide groove 14 and is restricted in the vertical direction by the side wall of the slide groove 14, preventing the cover 3 from moving up or down during the sliding process, further enhancing the stability of the movement of the cover 3 and making the operation of the locking tongue 2 more precise and accurate.

[0038] like Figure 3 As shown, in one embodiment, the latch structure further includes a fastening screw 7 that is inclined to the horizontal plane and is connected to the bottom of the housing 1 to fix the housing 1 to the sliding door body.

[0039] like Figure 4 , Figure 5 and Figure 6 As shown, this utility model also provides a lock, including a latch structure as described in any of the above embodiments, and a lock box 5. The lock box 5 is used to be installed on the upper or lower track. The lock box 5 has a first side wall 51, which is used to strike the cover 3 to move the cover 3 to a second position. When the cover 3 is in the second position, the latch 2 can extend from the opening 11 and contact the lock box 5 to achieve locking.

[0040] In one embodiment, the lock box 5 has a second sidewall 52 opposite to the first sidewall 51. When the sliding door is moved into place and the cover 3 is moved to the second position, the latch 2 extends out from the opening 11 and abuts against the second sidewall 52 to restrict the sliding door from moving along the direction from the second sidewall 52 to the first sidewall 51.

[0041] It should be noted that in some other embodiments, the lock box 5 may be provided with a lock groove. When the sliding door moves into place and the cover 3 moves to the second position, the lock tongue 2 extends out from the opening 11 and engages with the lock groove to restrict the sliding door from moving along the direction from the second side wall 52 to the first side wall 51.

[0042] In one embodiment, the lock further includes a transmission component 6, a handle, and a lock cylinder (not shown). The transmission component 6 is tractively connected between the bolt 2 and the lock cylinder. The lock cylinder and the handle are disposed on the sliding door body, and the lock cylinder and the handle are tractively connected. Driven by the handle, the lock cylinder can move to drive the transmission component 6 to move up and down. Driven by the transmission component 6, the bolt 2 can extend and retract relative to the opening 11.

[0043] In summary, the bolt structure and lock including the bolt disclosed in this utility model can bring at least the following beneficial technical effects: (1) By setting a movable cover 3, the latch 2 is blocked from extending when the sliding door is not in place, thus avoiding collision between the latch 2 and the upper track or the outer wall of the lock box 5 and eliminating safety hazards.

[0044] (2) After the sliding door moves into place, the cover 3 can promptly release the obstruction of the latch 2, allowing the latch 2 to extend normally to achieve the locking function, ensuring that the basic function of the lock is not affected.

[0045] (3) The overall locking tongue structure is set on the upper or lower side of the sliding door body, which moves the locking tongue structure out of the user's sight, thus maintaining the overall aesthetics of the door and window system and preventing the original aesthetic design from being destroyed by the addition of structures such as the cover 3.

[0046] (4) The automatic reset function of the reset component 4 simplifies the user's operation process. After the user unlocks the sliding door, there is no need to manually reset the cover 3 to the first position. The reset component 4 will automatically complete this action, reducing the user's operation steps and operation difficulty.

[0047] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A locking tongue structure, characterized in that, include: A housing (1) is provided on the upper or lower side of the sliding door body, and the housing (1) is provided with an opening (11); The locking tongue (2) is slidably disposed on the housing (1) to extend and retract relative to the opening (11); A cover (3) is slidably disposed on the housing (1). The cover (3) is movable relative to the housing (1) in a first position and a second position. When the cover (3) is in the first position, the cover (3) is at least partially located above the latch (2) to prevent the latch (2) from extending out of the opening (11). When the cover (3) is moved to the second position by a collision, the cover (3) releases the obstruction of the latch (2), and the latch (2) can extend out of the opening (11).

2. The locking tongue structure according to claim 1, characterized in that, The latch structure also includes a reset member (4), which is disposed between the cover (3) and the housing (1). When the latch (2) retracts and the cover (3) is not impacted, the reset member (4) is used to elastically drive the cover (3) to reset from the second position to the first position.

3. The locking tongue structure according to claim 2, characterized in that, The reset component (4) is a horizontally arranged spring. The cover (3) is provided with a first connecting groove (32), and the housing (1) is provided with a second connecting groove (12). One end of the spring is engaged with the first connecting groove (32), and the other end of the spring is engaged with the second connecting groove (12).

4. The locking tongue structure according to any one of claims 1-3, characterized in that, The upper side of the cover (3) is provided with an impact block (31), which is used to collide with the first side wall (51) of the lock box (5).

5. The locking tongue structure according to any one of claims 1-3, characterized in that, A guide structure is provided between the cover (3) and the shell (1), the guide structure being used to guide the cover (3) to slide horizontally relative to the shell (1).

6. The locking tongue structure according to claim 5, characterized in that, The guide structure includes a sliding cavity (13), which is disposed in the housing (1), and the cover (3) is slidably disposed in the sliding cavity (13).

7. The locking tongue structure according to claim 6, characterized in that, The guide structure also includes a first guide rib (131) and a first guide groove (33) that both extend in the horizontal direction. The first guide rib (131) and the first guide groove (33) are slidably engaged. One of the first guide rib (131) and the first guide groove (33) is disposed on the cover (3), and the other is disposed on the side wall of the sliding cavity (13).

8. The locking tongue structure according to claim 7, characterized in that, The first guide rib (131) is disposed on the side wall of the sliding cavity (13), and the first guide groove (33) is disposed on the cover (3); a second guide groove (132) is formed between the first guide rib (131) and the side wall of the sliding cavity (13), and a second guide rib (34) is disposed on the side wall of the cover (3). The second guide rib (34) and the second guide groove (132) are slidably engaged, and the second guide rib (34) is located below the first guide rib (131).

9. The locking tongue structure according to claim 5, characterized in that, The guide structure also includes a slider (35) and a groove (14). The slider (35) is disposed on the side wall of the cover (3), and the groove (14) is disposed on the upper side wall of the housing (1) in a horizontal direction.

10. A lock, characterized in that, The lock includes the latch structure as described in claims 1-9, and also includes a lock box (5), which is used to be mounted on the upper or lower track. The lock box (5) has a first sidewall (51) which is used to strike the cover (3) to move the cover (3) to the second position. When the cover (3) is in the second position, the latch (2) can extend from the opening (11) and contact the lock box (5) to achieve locking.

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