Lock

Abstract

The utility model belongs to the technical field of locks, and particularly relates to a lock which comprises a key, a plunger latch assembly and a lock catch assembly. The plunger latch assembly and the lock catch assembly are oppositely arranged, the plunger latch assembly is provided with a spring bolt, and the lock catch assembly is provided with a lock catch block; a key hole is formed in one side of the plunger latch assembly, and after a key is inserted into the key hole, the key is twisted to drive the spring bolt of the plunger latch assembly and the lock catch block of the lock catch assembly to be locked and clamped so as to achieve locking, or the spring bolt of the plunger latch assembly is driven to be separated from the lock catch block of the lock catch assembly so as to relieve locking and clamping between the spring bolt and the lock catch block so as to achieve unlocking. Through the arrangement, more than two door (window) bodies can be locked when the lock is locked in application scenes such as a combined door (window) and the like, so that the door (window) bodies can be locked into a whole and can be conveniently pushed and pulled, and the door (window) bodies can be conveniently disassembled into a single body after being unlocked. The lock is applicable to multiple application scenes due to the mounting mode of the plunger latch assembly and the lock catch assembly.

Description

Technical Field

[0001] This utility model belongs to the technical field of locks, and specifically relates to a lock. Background Technology

[0002] Modular doors and windows are quite common in daily life. To lock together two or more doors of a modular door or two or more windows of a modular window, either to fix them as a whole or to facilitate overall sliding, locks that connect modular doors and windows are increasingly widely used.

[0003] Currently, there is a general lack of mature and complete technical solutions for locks used in locking combination doors, combination windows, and similar applications. For example, the lock disclosed in the utility model patent with authorization announcement number CN221722536U includes a first door body and a second door body. The lock includes a lock assembly and a bolt. The lock is installed on the first door body. The lock assembly is configured such that when it is in a first working state, it can move the bolt away from the lock assembly and abut against the second door body to prevent relative movement between the first and second door bodies. The lock assembly is also configured such that when it is in a second working state, it can move the bolt towards the lock assembly to allow relative movement between the first and second door bodies.

[0004] The lock disclosed in the aforementioned utility model patent, although the two doors can be abutted together by the lock when locked, there is only a pushing force between the two doors and no pulling force between them. This makes it impossible to securely lock two or more doors into a whole and to push and pull them conveniently. Moreover, it is only suitable for designs where the doors and their tracks are staggered, which is inconvenient to use and has a narrow range of applications. Utility Model Content

[0005] The purpose of this utility model is to provide a lock that solves the technical problem in the prior art that "in combination doors and similar application scenarios, two or more door panels cannot be securely locked into a whole and can be easily pushed and pulled, and the lock is only suitable for designs where the door panels and their tracks are staggered, which is inconvenient to use and has a narrow application scenario".

[0006] To achieve the above objectives, this utility model provides a lock comprising: a key, a latch assembly, and a latch assembly;

[0007] The latch assembly and the latch assembly are disposed opposite to each other. The latch assembly is provided with a latch tongue, and the latch assembly is provided with a latch block.

[0008] One side of the latch assembly is provided with a keyhole. After inserting the key into the keyhole, the key is turned to drive the latch of the latch assembly to lock and engage with the latch block of the latch assembly to lock, or to drive the latch of the latch assembly to disengage from the latch block of the latch assembly to release the locking engagement and unlock.

[0009] Optionally, the latch assembly includes a base box, a latch, and a lock cylinder, wherein the latch is located on the inner bottom surface of the base box and is slidably connected to the inner bottom surface of the base box;

[0010] The bottom surface of the inner side of the base box has a base box hole. The lock cylinder is located above the latch. One end of the lock cylinder near the base box hole is adapted to be connected to the base box hole. The lock cylinder rotates around the axis of the base box hole and is limited by the base box hole.

[0011] The latch has a latch rotation groove aligned with the bottom box hole, and the lock cylinder is rotatably connected to the latch rotation groove.

[0012] Optionally, the latch is provided with a short column on the side of the latch rotation groove, and the lock cylinder is provided with a lock cylinder pressing part and a lock cylinder clearance groove;

[0013] During the locking process, the lock cylinder pressing part of the lock cylinder abuts against the short post of the latch.

[0014] Optionally, the latch has a high protrusion on the side of the short post, the high protrusion and the short post are on the same plane of the latch, the lock cylinder has a sliding hole, and the high protrusion is located in the sliding hole and is limited by it;

[0015] During the unlocking or locking process, the lock cylinder is driven to rotate, causing the sliding hole to rotate synchronously to push against the high boss, thereby driving the bolt to move.

[0016] Optionally, the latch is provided with a latch cam, and the lock cylinder is provided with a lock cylinder cam. During the unlocking or locking process, the latch cam and the lock cylinder cam rotate and abut against each other.

[0017] Optionally, the bottom surface of the inner side of the base box is provided with two base box limiting posts, and the latch is provided with two latch sliding grooves. When the periphery of the two latch sliding grooves slides around the two base box limiting posts, the two latch sliding grooves abut against the two base box limiting posts.

[0018] Optionally, the latch assembly further includes two elastic members;

[0019] The bottom inner side of the base box is provided with two base box tensioning posts, and the latch is provided with two latch tensioning posts. The two base box tensioning posts and the two latch tensioning posts are elastically connected by two elastic elements respectively.

[0020] Optionally, the latch assembly includes a latch box, and the latch has a latching tongue on one side near the latch box, and the latch has a snap-fit ​​section;

[0021] The base box has a through hole corresponding to the position of the latch, which is aligned with the latch during the movement of the latch. The latch box has a latch hole on the side near the through hole, which is aligned with the through hole.

[0022] The latch box is provided with a latch block. When locked and the latch assembly and the latch assembly are pulled in opposite directions, the latch segment on the latch tongue engages with the latch block and is limited by it.

[0023] Optionally, the latch is further provided with a first limiting groove and a second limiting groove, the first limiting groove and the second limiting groove being located at the far end opposite to the bolt.

[0024] Optionally, the side of the latch that contacts the bottom inner side of the base box is provided with a latch sliding surface and a latch clearance surface, and the latch sliding surface is slidably connected to the bottom inner side of the base box.

[0025] The lock provided in this utility model embodiment has at least one of the following technical effects: In this utility model, by providing a key, a latch assembly, and a latch assembly, the lock can securely lock two or more doors or windows when closed in application scenarios such as combination doors and combination windows, allowing them to be locked as a single unit and easily pushed and pulled. Simultaneously, it is easy to disassemble into individual units after unlocking. Furthermore, the latch assembly and latch assembly of the lock can both be embedded and concealed, or one can be embedded and concealed while the other is externally mounted, making it applicable to application scenarios such as combination doors with single-track parallel arrangements and combination doors with multi-track staggered arrangements. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art 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.

[0027] Figure 1 This is a schematic diagram of the lock provided in this embodiment;

[0028] Figure 2 This is a schematic diagram of the locking assembly in the locked state provided in this embodiment;

[0029] Figure 3This is a structural schematic diagram of the lock in the locked state provided in this embodiment;

[0030] Figure 4 This is a partial cross-sectional view of the lock in the locked state provided in this embodiment;

[0031] Figure 5 This is an exploded view of the lock provided in this embodiment;

[0032] Figure 6 This is a schematic diagram of the lock cylinder provided in this embodiment;

[0033] Figure 7 This is another perspective view of the lock cylinder provided in this embodiment;

[0034] Figure 8 This is a schematic diagram of the latch structure provided in this embodiment;

[0035] Figure 9 Another perspective view of the latch provided in this embodiment;

[0036] Figure 10 This is a schematic diagram of the structure of the bottom box provided in this embodiment;

[0037] Figure 11 This is a schematic diagram of the locking box provided in this embodiment;

[0038] Figure 12 This is a schematic diagram showing the contact between the low column and the lock cylinder pressing part during the locking process of the lock provided in this embodiment;

[0039] Figure 13 This is a schematic diagram showing the contact between the raised boss and the sliding hole during the locking process of the lock provided in this embodiment;

[0040] Figure 14 This is a schematic diagram showing the contact between the latch sliding groove and the bottom box limiting post during the locking process of the lock provided in this embodiment;

[0041] Figure 15 This is a schematic diagram showing the contact between the lock cylinder cam and the latch cam during the locking process of the lock provided in this embodiment;

[0042] Figure 16 This is a schematic diagram showing the arcuate contour of the latch sliding groove sliding around the bottom box limiting post during the locking process of the lock provided in this embodiment;

[0043] Figure 17 This is a schematic diagram showing the bottom box limiting post engaging with the first limiting groove when the lock is locked in this embodiment.

[0044] The following are the labeling elements in the figure:

[0045] Key 100, lock cylinder 200, keyhole 210, sliding hole 220, lock cylinder cam 230, lock cylinder pressing part 240, lock cylinder clearance groove 250, bolt 300, high boss 310, bolt cam 320, bolt sliding groove 330, bolt tensioning post 340, bolt tongue 350, latching section 351, low post 360, first limiting groove 371, second limiting groove 372, bolt sliding surface 381, latch clearance surface 382, ​​latch rotation groove 390, base box 400, base box limiting post 410, positioning section 411, base box tensioning post 420, through hole 430, base box hole 440, elastic element 500, lock box 600, lock hole 610, lock block 620, top cover 700, top cover mounting hole 710, lock head 800, lock head cover 900, lock box baffle 1000. Detailed Implementation

[0046] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0047] In the description of the embodiments of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0048] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0049] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0050] In one embodiment of this utility model, such as Figures 1-17 As shown, a lock is provided, including: a key 100, a latch assembly and a latch assembly;

[0051] The latch assembly and the latch assembly are arranged opposite to each other. The latch assembly is provided with a latch tongue 350 and the latch assembly is provided with a latch block 620.

[0052] A keyhole 210 is provided on one side of the latch assembly. After inserting the key 100 into the keyhole 210, the key 100 is turned to drive the latch tongue 350 of the latch assembly to lock and engage with the latch block 620 of the latch assembly to lock, or to drive the latch tongue 350 of the latch assembly to disengage from the latch block 620 of the latch assembly to release the locking engagement between the two and unlock.

[0053] Specifically, by incorporating a key 100, a latch assembly, and a latch assembly, the lock can securely lock two or more doors or windows when closed in applications such as combination doors and combination windows, allowing them to be locked as a single unit and easily pushed and pulled. Simultaneously, it can be easily disassembled into individual units after unlocking. Furthermore, the latch assembly and latch assembly can both be recessed and concealed, or one can be recessed and concealed while the other is externally mounted, making it suitable for applications such as combination doors with single-track parallel configurations and combination doors with multi-track staggered configurations.

[0054] In another embodiment of this utility model, such as Figures 2-10 As shown, the latch assembly includes a base box 400, a latch 300, and a lock cylinder 200. The latch 300 is located on the inner bottom surface of the base box 400 and is slidably connected to the inner bottom surface of the base box 400. A base box hole 440 is formed on the inner bottom surface of the base box 400. The lock cylinder 200 is located above the latch 300. One end of the lock cylinder 200 near the base box hole 440 is adapted to be connected to the base box hole 440, and the lock cylinder 200 rotates around the axis of the base box hole 440 and is limited by the base box hole 400. A latch rotation groove 390 is formed on the latch 300 at the position aligned with the base box hole 440, and the lock cylinder 200 is rotatably connected to the latch rotation groove 390.

[0055] In another embodiment of this utility model, such as Figures 6-9As shown, the latch 300 has a low post 360 beside the latch rotation groove 390. The lock cylinder 200 has a lock cylinder pressing part 240 and a lock cylinder clearance groove 250. The latch 300 has a high boss 310 beside the low post 360. The high boss 310 and the low post 360 are on the same plane as the latch 300. The lock cylinder 200 has a sliding hole 220, and the high boss 310 is located in the sliding hole 220 and is limited by it. During the locking or unlocking process, the lock cylinder 200 is driven to rotate, causing the sliding hole 220 to rotate synchronously to push against the high boss 310, thereby driving the latch 300 to move. During the locking process, the lock cylinder pressing part 240 of the lock cylinder 200 first abuts against the low post 360 of the bolt 300 and moves relative to it for a certain distance before the sliding hole 220 of the lock cylinder 200 abuts against the high boss 310 of the bolt 300 and continues to drive the bolt 300 to move. Specifically, the low post 360 is provided to prevent self-locking when the bolt 300 is driven to rotate by the sliding hole 220 pushing against the high boss 310 in the initial stage of locking. At the same time, the angle of force when the lock cylinder pressing part 240 of the lock cylinder 200 pushes against the low post 360 to drive the bolt 300 to rotate makes it smoother and less strenuous for the user to turn the key 100 to lock, thus providing a more comfortable experience. Subsequently, during the movement of the high boss 310 of the bolt 300 by the sliding hole 220, the lock cylinder clearance groove 250 causes the low post 360 to retract from contact with the lock cylinder pressing part 240.

[0056] In another embodiment of this utility model, such as Figures 6-8 As shown, the latch 300 is provided with a latch cam 320, and the lock cylinder 200 is provided with a lock cylinder cam 230. During the unlocking or locking process, the latch cam 320 and the lock cylinder cam 230 rotate and abut against each other. The lock cylinder cam 230 and the latch cam 320 are provided so that when the bolt 350 is ejected during unlocking or inserted during locking, the force parallel to the direction of the bolt 350 can be better transmitted, thus making the action of ejecting and inserting the bolt 350 smoother.

[0057] In another embodiment of this utility model, such as Figures 5-10As shown, the bottom inner surface of the base box 400 is provided with two base box limiting posts 410. The latch 300 is provided with two latch sliding grooves 330. When the periphery of the two latch sliding grooves 330 slides around the two base box limiting posts 410, the two latch sliding grooves 330 abut against the two base box limiting posts 410. The top of each of the two base box limiting posts 410 of the base box 400 is provided with a positioning section 411. The base box 400 is also provided with a top cover 700, and the top cover 700 is provided with two top cover mounting holes 710 aligned with the two positioning sections 411. After the two positioning sections 411 are aligned and inserted into the two top cover mounting holes 710, the top cover 700 can be installed together with the base box 400, and the top cover 700 and the base box 400 can be sealed together or movably disassembled. The top cover 700 and the base box 400 form a sealed box body to protect the internal components. A lock head 800 is also provided on the upper outer side of the top cover 700. The keyhole is aligned with the shank of the key 100. The lock head 800 protects the keyhole. The lock head 800 is also provided with a lock head cover 900 to protect the lock head 800. The lock head 800 is housed in the groove of the lock head cover 900 and is limited by the lock head cover 900, so that the lock head 800 can rotate with the key 100 within the space limited by the lock head cover 900 under the action of the key 100.

[0058] In another embodiment of this utility model, such as Figures 5-10 As shown, the latch assembly also includes two elastic elements 500. Two bottom box tensioning posts 420 are provided on the inner bottom surface of the bottom box 400, and two latch tensioning posts 340 are provided on the latch 300. The two bottom box tensioning posts 420 and the two latch tensioning posts 340 are elastically connected by two elastic elements 500 respectively. Specifically, the two elastic elements 500 are generally tension springs. The obliquely positioned elastic elements 500 apply an oblique pulling force to the latch 300, so that the latch 300 is subjected to a pulling force perpendicular to the direction of the bolt 350 during the locking process. Combined with the forces between the sliding hole 220 and the high boss 310, and between the lock cylinder cam 230 and the latch cam 320 during movement, the combined force causes the latch 350 to enter the latch hole 610, and the latching section 351 is limited by the latch block 620, engaging obliquely to complete the locking. The forward-facing elastic element 500 applies a pulling force parallel to the direction of the latch 350 to the latch 300. This, combined with the obliquely positioned elastic element 500, causes the two bottom box limiting posts 410 to be pulled and slid into the first limiting groove 371 and the second limiting groove 372 of the latch 300 during locking, and then locked in place. During unlocking, the pulling force of the two elastic elements 500 causes the two bottom box limiting posts 410 to slide into the latch sliding groove 330, and the latch 350 quickly retracts into the bottom box 400 for rapid reset. The elastic element 500, the bottom box tensioning post 420, and the latch tensioning post 340 can also be single or multiple elements, or any combination thereof, that achieve the same technical effect.

[0059] In another embodiment of this utility model, such as Figures 5-11As shown, the locking assembly includes a locking box 600. A latch 350 is provided on the side of the latch 300 near the locking box 600, and the latch 350 has a latching section 351. A through hole 430 is provided on the base box 400 corresponding to the position of the latch 350, which aligns with the latch 350 during the movement of the latch 300. It should be further noted that the through hole 430 on the base box 400 is only one embodiment shown in the illustration; it can also be provided on the top cover 700, or both the top cover 700 and the base box 400 may have portions with through holes 430. A locking hole 610 is provided on the side of the locking box 600 near the through hole 430, which is aligned with the through hole 430. The design of the number of latches 350, through holes 430, and locking holes 610 mentioned in this embodiment is not limited to the two embodiments shown in the illustration; it can also be one or more that achieve the same technical effect. The side of the lock box 600 away from the latch 350 is also provided with a lock box baffle 1000 to seal and protect the lock box 600. The lock box 600 is provided with a lock block 620. When locked and the latch assembly and the lock assembly are pulled in opposite directions, the latch section 351 on the latch 350 engages with the lock block 620 and is limited by it.

[0060] In another embodiment of this utility model, such as Figures 4-5 As shown, the latch 300 is also provided with a first limiting groove 371 and a second limiting groove 372, which are located at the far end opposite to the bolt 350. Specifically, at the end of the locking process, the first limiting groove 371 and the second limiting groove 372 are precisely engaged with the two bottom box limiting posts 410, so that unless an external force is applied to twist the lock cylinder 200, the bolt 350 of the latch 300 remains in a locked state. The limiting grooves 371 and 372 and the bottom box limiting posts 410 can also be provided individually or in multiple locations.

[0061] In another embodiment of this utility model, such as Figure 9 As shown, the side of the latch 300 that contacts the inner bottom of the base box 400 is provided with a latch sliding surface 381 and a latch clearance surface 382. The latch sliding surface 381 is slidably connected to the inner bottom surface of the base box 400. When the latch sliding surface 381 slides on the inner bottom surface of the base box 400, the smaller design of the latch sliding surface 381 reduces the contact area and friction, thereby making the process of turning the lock cylinder 200 with the key 100 smoother and more fluid during the unlocking and closing process.

[0062] The working principle of the lock in this utility model is as follows:

[0063] During the locking process from the unlocked state, the key is inserted 100% and then turned. For example... Figure 12The lock cylinder pressing part 240 of the lock cylinder 200 first abuts against the low post 360 of the latch 300 to drive the latch 300 to move. At this time, the sliding hole 220 of the lock cylinder 200 and the high protrusion 310 of the latch 300 have not yet come into contact.

[0064] After that, the movement reached such a state Figure 13 At this time, the transition occurs when the sliding hole 220 of the lock cylinder 200 abuts against the high boss 310 of the latch 300, after which the low post 360 withdraws from contact with the lock cylinder pressing part 240 and is located in the lock cylinder clearance groove 250.

[0065] Subsequently, under the action of the sliding hole 220 pressing against the high boss 310 to drive the latch 300 to move and the oblique pulling force of the elastic element 500, it moves to the position shown. Figure 14 At this time, the bottom box limiting post 410 abuts against one side of the latch sliding groove 330. When the bottom box limiting post 410 moves against the side of the latch sliding groove 330, the latch 300 can only move in a direction parallel to the bolt 350, while the direction of movement perpendicular to the bolt 350 is limited.

[0066] After that, the movement reached such a state Figure 15 At this time, the lock cylinder cam 230 abuts against the latch cam 320.

[0067] After that, the movement reached such a state Figure 16 At that time, under the action of the force between the lock core cam 230 and the latch cam 320 and the oblique pulling force of the elastic element 500, the arc surface contour of the edge of the latch sliding groove 330 slides around the bottom box limiting post 410.

[0068] Finally, as Figure 17 Upon reaching the final locked position, the bottom box limiting post 410 engages with the first limiting groove 371 to ensure a secure lock, then the key 100 is removed. During unlocking, the key 100 is inserted while the lock is engaged and twisted in the reverse direction to reset. Figure 12 The unlocked state.

[0069] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A lock, characterized in that: Includes key, latch assembly, and latch assembly; The latch assembly and the latch assembly are disposed opposite to each other. The latch assembly is provided with a latch tongue, and the latch assembly is provided with a latch block. One side of the latch assembly is provided with a keyhole. After inserting the key into the keyhole, the key is turned to drive the latch of the latch assembly to lock and engage with the latch block of the latch assembly to lock, or to drive the latch of the latch assembly to disengage from the latch block of the latch assembly to release the locking engagement and unlock.

2. The lock according to claim 1, characterized in that: The latch assembly includes a base box, a latch, and a lock cylinder, wherein the latch is located on the inner bottom surface of the base box and is slidably connected to the inner bottom surface of the base box; The bottom surface of the inner side of the base box has a base box hole. The lock cylinder is located above the latch. One end of the lock cylinder near the base box hole is adapted to be connected to the base box hole. The lock cylinder rotates around the axis of the base box hole and is limited by the base box hole. The latch has a latch rotation groove aligned with the bottom box hole, and the lock cylinder is rotatably connected to the latch rotation groove.

3. The lock according to claim 2, characterized in that: The latch is provided with a short column on the side of the latch rotation groove, and the lock cylinder is provided with a lock cylinder pressing part and a lock cylinder clearance groove; During the locking process, the lock cylinder pressing part of the lock cylinder abuts against the short post of the latch.

4. The lock according to claim 3, characterized in that: The latch has a high protrusion on the side of the short column, the high protrusion and the short column are on the same plane of the latch, the lock cylinder has a sliding hole, and the high protrusion is located in the sliding hole and is limited by it; During the locking or unlocking process, the lock cylinder is driven to rotate, causing the sliding hole to rotate synchronously to push against the high boss, thereby driving the bolt to move.

5. The lock according to claim 2, characterized in that: The latch is provided with a latch cam, and the lock cylinder is provided with a lock cylinder cam. During the unlocking or locking process, the latch cam and the lock cylinder cam rotate and abut against each other.

6. The lock according to claim 2, characterized in that: The bottom inner side of the base box is provided with two base box limiting posts, and the latch is provided with two latch sliding grooves. When the periphery of the two latch sliding grooves slides around the two base box limiting posts, the two latch sliding grooves abut against the two base box limiting posts.

7. The lock according to claim 3, characterized in that: The latch assembly also includes two elastic elements; The bottom inner side of the base box is provided with two base box tensioning posts, and the latch is provided with two latch tensioning posts. The two base box tensioning posts and the two latch tensioning posts are elastically connected by two elastic elements respectively.

8. The lock according to any one of claims 2-7, characterized in that: The latch assembly includes a latch box, and the latch has a latch tongue on one side near the latch box, and the latch tongue has a latching section; The base box has a through hole corresponding to the position of the latch, which is aligned with the latch during the movement of the latch. The latch box has a latch hole on the side near the through hole, which is aligned with the through hole. The latch box is provided with a latch block. When locked and the latch assembly and the latch assembly are pulled in opposite directions, the latch segment on the latch tongue engages with the latch block and is limited by it.

9. The lock according to claim 8, characterized in that: The latch is also provided with a first limiting groove and a second limiting groove, which are located at the far end opposite to the bolt.

10. The lock according to claim 9, characterized in that: The side of the latch that contacts the bottom inner side of the base box is provided with a latch sliding surface and a latch clearance surface, and the latch sliding surface is slidably connected to the bottom inner side of the base box.

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