A snap lock

Abstract

The utility model relates to a lock, especially a lock with button switch and password component placed on two sides, which comprises a main body and a vice body for installation on one opening and closing side of a box and hinged rotation cooperation, a lock hook installed on the other opening and closing side of the box, and a push button in the vice body for unlocking by separating from the lock hook, the utility model places the button switch in the vice body and the password component in the main body, the password component does not jump up with the main body, only the vice body with the button switch jumps up, which reduces the false touch problem of the password component, and under the premise of not increasing the volume, the lock body is provided with the password component and the switch placed in different positions, the switch is not affected by the password component in the main body, the volume of the switch is increased, the switch mode is more diversified, and the internal space of the main body is reduced due to the switch, so that the stability of the password component is stronger, and the utility model also has the characteristics of simple structure, convenient processing and easy assembly.

Description

Technical Field

[0001] This utility model relates to a latch, and more particularly to a latch in which a push-button switch and a password component are placed on opposite sides. Background Technology

[0002] The following patents on the market, which use hinged rotating locking mechanisms, are common in the industry: CN106760988B ("A Simple-to-Operate Thin Lock"), CN108625688A ("An External Thin Lock"), CN208106131U ("A Simple Lock"), and CN208456322U ("A Simple Lock"). All of these patents place the combination lock, lock cylinder, and push-button switch on the same side of the main body, with the secondary body hinged to the main body. When unlocking, the push-button switch and combination lock are tightly placed on the same side, making the lock body very compact. The push-button switch cannot be used efficiently, making operation very inconvenient. Furthermore, when the secondary body springs up, the button and the springing position are too close, causing the user's finger to be impacted by the spring force of the secondary body when unlocking.

[0003] The patent, with announcement number CN105239855A and titled "A Lock and a Bag Using the Lock," also places the combination lock, lock cylinder, and push-button switch all in the lock body. When unlocking, the entire lock body pops up, which can easily cause the combination lock to change its code. Then, when using the push-button lock to close the bag, it is also easy to touch the combination lock on the surface of the lock body. Utility Model Content

[0004] In view of the shortcomings of existing technology, this utility model provides a latch.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: a latch, characterized in that it includes a main body and a secondary body for installation on one opening and closing side of the box and hinged and rotatably engaged, and a locking hook installed on the other opening and closing side of the box. The secondary body is provided with a push button for unlocking by disengaging from the locking hook, and the main body is provided with a password component to prevent the push button from unlocking. When the password is correct, the push button unlocks the latch by sliding within the secondary body.

[0006] The push button is located at the end of the sub-body, and the movement path formed by the reciprocating motion is parallel to the length direction of the latch.

[0007] The auxiliary body is provided with a groove for the push button to reciprocate. The push button is provided with a locking groove that cooperates with the locking hook. The auxiliary body is engaged with the locking hook along with the locking groove to lock the box.

[0008] The password component includes an unlocking linkage for preventing the push button from sliding. The unlocking linkage has a reciprocating motion path and is opened and closed by switching between correct and incorrect passwords in the password component.

[0009] The unlocking linkage has a protrusion, and the push button has a slot that matches the protrusion. The movement path formed by the reciprocating motion of the unlocking linkage is perpendicular to the movement path formed by the reciprocating motion of the push button. When the password is correct, the projection surface of the protrusion coincides with the slot, and the protrusion is inserted into the slot during the unlocking process.

[0010] The password component includes a password wheel and a mating wheel that are linked together. The rotation surfaces of the password wheel and the mating wheel are parallel to the extension surface formed by the end face of the main body. It also includes a lock block for preventing the unlocking linkage from sliding to unlock. The lock block is movably connected to the password component and achieves reciprocating motion by converting between the correct and incorrect passwords of the password component.

[0011] A transmission block is provided between the locking block and the unlocking linkage to facilitate transmission between the two, and the transmission block is rotatably connected to the main body.

[0012] The main body is provided with a lock cylinder assembly, which includes a rotating block for actuating the lock block. The lock is unlocked by rotating the rotating block.

[0013] The mating wheel has a groove, and the lock block has a protrusion that matches the groove. When the password is correct, the lock block moves back and forth on the password assembly by engaging the groove with the protrusion. The lock block also includes a code switching switch that is rotatably connected to the mating wheel and used to prevent the lock block from moving back and forth. The password wheel and the mating wheel are separated by the code switching switch to achieve code switching.

[0014] The unlocking linkage is provided with a stop part to prevent the push button from sliding, and the push button is provided with a stop part adapted to the stop part. The unlocking linkage and the push button achieve a repulsive linkage through the cooperation of the stop part and the stop part. The movement path formed by the reciprocating motion of the unlocking linkage is parallel to the movement path formed by the reciprocating motion of the push button.

[0015] The password component includes a password wheel and a mating wheel that are linked together. The rotation surfaces of the password wheel and the mating wheel are perpendicular to the extension surface formed by the end face of the main body. It also includes a lock block for preventing the unlocking linkage from sliding to unlock. The lock block is movably connected to the password component and has a swing angle. The lock block achieves reciprocating motion by converting between the correct and incorrect passwords of the password component.

[0016] The lock block has a first unlocking position, a locking position and a second unlocking position in sequence by swinging. The main body is equipped with a lock cylinder assembly. The locking position and the first unlocking position can be switched between each other by the correctness and error of the password. The locking position and the second unlocking position can be switched between each other by the cooperation of the lock cylinder assembly and the lock block.

[0017] The lock cylinder assembly includes a rotating block for actuating the lock block. In the locked position, the lock block swings by rotating the rotating block, thus switching between the locked position and the second unlocked position.

[0018] The password assembly includes an axle perpendicular to the rotation surface of the password wheel. The password wheel and a mating wheel are mounted on the axle. One end of the axle is equipped with a code-adjusting switch. Between the mating wheel and the code-adjusting switch, there is a slider that abuts against the code-adjusting switch and is opened and closed by a locking block. The slider is mounted on the axle. When the password is correct, the code-adjusting switch adjusts the code by forcing the slider to press the mating wheel away from the password wheel along the axial direction of the axle.

[0019] The beneficial effects of this utility model are as follows: This utility model places the push-button switch in the sub-body and the password component in the main body. The password component no longer pops up with the main body, but only the sub-body with the push-button switch pops up, reducing the problem of accidental activation of the password component and reducing the possibility of code changes. At the same time, without increasing the size of the lock body, the password component and the switch are placed in different positions, so that the switch is not affected by the password component inside the main body. Increasing the size of the switch allows for more diverse switching methods. Furthermore, the internal space of the main body is reduced due to the reduction of the switch, making the password component more stable. This utility model also has the characteristics of simple structure, convenient processing, and easy assembly. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of Example 1;

[0021] Figure 2 This is an exploded view of the structure of Example 1;

[0022] Figure 3 This is a cross-sectional view of the structure of Example 1 when the latch and the hook are engaged;

[0023] Figure 4 This is a cross-sectional view of the structure of Example 1 when the latch and hook are unlocked;

[0024] Figure 5 This is a schematic diagram of the structure of Example 1 when locked;

[0025] Figure 6 This is a schematic diagram of the structure of Example 1 when the push button is pressed;

[0026] Figure 7 This is a schematic diagram of the structure when the lock cylinder assembly is used to unlock and the push button is pressed in Example 1;

[0027] Figure 8 This is a schematic diagram of the structure of Example 1 when the switching switch is turned on;

[0028] Figure 9 This is a schematic diagram of the structure of Example 2;

[0029] Figure 10 This is an exploded view of the structure of Example 2;

[0030] Figure 11 This is a cross-sectional view of the structure of Example 2 when the latch and hook are engaged;

[0031] Figure 12 This is a cross-sectional view of the structure of Example 2 when the latch and hook are unlocked;

[0032] Figure 13 This is a schematic diagram of the structure of Example 2 when locked;

[0033] Figure 14 This is a schematic diagram of the structure of Example 2 when the push button is pressed in the first unlock position;

[0034] Figure 15 This is a schematic diagram of the structure of Example 2 in the second unlock position;

[0035] Figure 16 This is a schematic diagram of the structure of Example 2 when the switching switch is turned on;

[0036] Figure 17 This is a schematic diagram of the cooperative structure of the unlocking linkage, lock block, and password component in the first unlocked state of Embodiment 2;

[0037] Figure 18 This is a schematic diagram of the cooperative structure of the unlocking linkage, lock block, and password component in the locked state in Embodiment 2;

[0038] Figure 19 This is a schematic diagram of the cooperative structure of the unlocking linkage, lock block and password component in the second unlocking state of Embodiment 2. Detailed Implementation

[0039] Example 1; as Figures 1-8 As shown, a latch includes a main body 100 and a secondary body 200 for mounting on one opening side of a housing and hinged to rotate, and a locking hook 500 mounted on the other opening side of the housing. The secondary body 200 has a push button 400 for unlocking by disengaging from the locking hook 500. The main body 100 has a password component 300 for preventing the push button 400 from unlocking. When the password is correct, the push button 400 unlocks the latch by sliding within the secondary body 200. The push button 400 is a button switch or push mechanism. The specific operation method is described below.

[0040] The push button 400 is located at the end of the sub-body 200, and the movement path formed by the reciprocating motion is parallel to the length direction of the latch. The push button 400 is set to unlock by reciprocating motion towards the main body 100, which is ergonomic.

[0041] The sub-body 200 is provided with a groove 210 for limiting the reciprocating motion of the push button 400. The push button 400 is provided with a locking groove 410 that cooperates with the locking hook 500. The sub-body 200 is engaged with the locking hook 500 along with the locking groove 410 to lock the box. The groove 210 can limit the reciprocating motion of the push button 400. A first spring 440 is provided in the groove 210 to prevent the push button 400 from unlocking. The engagement of the locking groove 410 and the locking hook 500 locks the box. The disengagement of the locking groove 410 from the locking hook 500 unlocks the lock.

[0042] The password component 300 includes an unlocking linkage 310 for preventing the push button 400 from sliding. The unlocking linkage 310 has a reciprocating motion path and is opened and closed by the conversion between the correct and incorrect passwords of the password component 300. Both embodiments 1 and 2 have an unlocking linkage 310 for preventing the push button 400 from sliding, but their structures are different. The sliding of the push button 400 is controlled by the password component 300.

[0043] The unlocking linkage 310 has a protrusion 311, and the push button 400 has a slot 420 that matches the protrusion 311. The movement path formed by the reciprocating motion of the unlocking linkage 310 is perpendicular to the movement path formed by the reciprocating motion of the push button 400. When the password is correct, the projection surface of the protrusion 311 coincides with the slot 420. During the unlocking process, the protrusion 311 is inserted into the slot 420. The protrusion 311 and the slot 420 form a space for mutual accommodation. Therefore, when the unlocking linkage 310 moves, it provides space for the push button 400 to unlock. The unlocking linkage 310 is provided with a second spring 313 to prevent unlocking.

[0044] The password component 300 includes a password wheel 320 and a mating wheel 330 that are linked together. The rotation surfaces of the password wheel 320 and the mating wheel 330 are parallel to the extension surface formed by the end face of the main body 100. It also includes a locking block 340 for preventing the unlocking linkage 310 from sliding to unlock. The locking block 340 is movably connected to the password component 300 and achieves reciprocating motion by converting between the correct and incorrect password of the password component 300. In this embodiment, it is a password wheel structure commonly referred to in the art as a flat wheel. The locking block 340 controls the unlocking linkage 310, the unlocking linkage 310 controls the push button 400, and the locking block 340 is controlled by whether the password is correct or not.

[0045] A transmission block 350 is provided between the lock block 340 and the unlocking linkage 310 for transmitting power between the two. The transmission block 350 is rotatably connected to the main body 100. The addition of a transmission block 350 between the lock block 340 and the unlocking linkage 310 can reserve installation space for the lock cylinder assembly 600, and the addition of the transmission block 350 makes the internal fit of the latch more coherent.

[0046] The main body 100 is provided with a lock cylinder assembly 600, which includes a rotating block 610 for actuating the lock block 340. The lock is unlocked by rotating the rotating block 610. In this embodiment, the lock cylinder assembly 600 is added. The lock cylinder assembly 600 is a relatively mature technology on the market and will not be described in detail here. As long as a suitable key is inserted, the rotating block 610 can be rotated. The rotating block 610 is in contact with the unlocking linkage 310.

[0047] The mating wheel 330 is provided with a groove 331, and the locking block 340 is provided with a protrusion 341 that matches the groove 331. When the password is correct, the locking block 340 reciprocates on the password assembly 300 by engaging the protrusion 341 with the groove 331. It also includes a code switching switch 360 rotatably connected to the mating wheel 330 and used to prevent the reciprocating motion of the locking block 340. The password wheel 320 and the mating wheel 330 are separated by the engagement of the code switching switch 360 to achieve code switching. In this embodiment, the code switching switch 360 is added so that the code can only be switched when the password is correct. The locking block 340 is provided with a third spring 342 that pushes the protrusion 341 toward the groove 331. The elastic restoring force of the third spring 342 is greater than that of the second spring 313. The code switching switch 360 can be set on the rotating shaft of the password wheel 320 and the mating wheel 330.

[0048] Instructions for use:

[0049] like Figure 5 As shown, in the locked state, when the password is incorrect, the grooves 331 on the three mating wheels 330 are not all facing the protrusions 341 of the lock block 340. Therefore, the lock block 340 is limited to the left side, and the unlocking linkage 310 is on the right side, blocking the push button 400 from unlocking downwards.

[0050] like Figure 6 As shown, when the password is correct, the grooves 331 on the three mating wheels 330 all face the protrusions 341 on the locking block 340. The locking block 340 moves to the right under the action of the third spring 342, and the protrusions 341 are engaged in the grooves 331. The unlocking linkage 310 moves to the left under the joint action of the locking block 340 and the transmission block 350. The protrusions 311 on the unlocking linkage 310 move to the slots 420 of the push button 400, thus giving the push button 400 room to move. At this time, when the push button 400 is pressed, the slots 420 will engage with the protrusions 311, and the lock slots 410 will leave the lock hook 500 to achieve unlocking.

[0051] like Figure 8As shown, when the password is correct, flipping the code switching switch 360 restricts the lock block 340 to the right side. At this time, the mating wheel 330 is completely locked. The fourth spring 321 on the password wheel 320 and the mating wheel 330, which is used to link the two, and the concave-convex structure between them are insufficient to allow the mating wheel 330 to rotate. Therefore, the password wheel 320 can rotate independently without causing the mating wheel 330 to rotate. This is the code switching process. After the code switching is completed, flipping the code switching switch 360 in the opposite direction ends the code switching. The linkage between the password wheel 320 and the mating wheel 330 is a conventional technology on the market, but it has been described in detail before.

[0052] like Figure 7 As shown, when the key is needed to unlock, regardless of whether the password is correct, the rotating block 610 rotates with the key, pushing the unlocking linkage 310 to the left. The protrusion 311 on the unlocking linkage 310 moves to the slot 420 of the push button 400, giving the push button 400 room to move. At this time, when the push button 400 is pressed, the slot 420 will engage with the protrusion 311, and the lock slot 410 will leave the lock hook 500 to achieve unlocking.

[0053] Example 2; as Figures 9-19 As shown, the difference between this embodiment and Embodiment 1 is that the unlocking linkage 310 is provided with a stop part 312 to prevent the push button 400 from sliding, and the push button 400 is provided with a stop part 430 adapted to the stop part 312. The unlocking linkage 310 and the push button 400 achieve a repulsive linkage through the cooperation of the stop part 312 and the stop part 430. The movement path formed by the reciprocating motion of the unlocking linkage 310 is parallel to the movement path formed by the reciprocating motion of the push button 400. The stop part 312 on the unlocking linkage 310 directly blocks the unlocking action of the push button 400. When the unlocking linkage 310 moves down, it frees up the space for the push button 400 to move towards the main body 100 to unlock. The unlocking linkage 310 is provided with a second spring 313 to prevent the unlocking linkage 310 from unlocking, as detailed below.

[0054] The password component 300 includes a password wheel 320 and a mating wheel 330 that are linked together. The rotation surfaces of the password wheel 320 and the mating wheel 330 are perpendicular to the extension surface formed by the end face of the main body 100. It also includes a locking block 340 for preventing the unlocking linkage 310 from sliding to unlock. The locking block 340 is movably connected to the password component 300 and has a swing angle. The locking block 340 achieves reciprocating motion by switching between the correct and incorrect password of the password component 300. This embodiment protects the password wheel 320 structure commonly referred to in the art as a two-color wheel. The locking block 340 controls the unlocking linkage 310, the unlocking linkage 310 controls the push button 400, and the locking block 340 is controlled by whether the password is correct or not.

[0055] The lock block 340 has a first unlocking position, a locking position, and a second unlocking position by swinging. The main body 100 is provided with a lock cylinder assembly 600. The locking position and the first unlocking position are mutually converted by the correctness and error of the password. The locking position and the second unlocking position are mutually converted by the cooperation of the lock cylinder assembly 600 and the lock block 340. The lock block 340 has three swing angle limits, which correspond to the locking, password unlocking, and key unlocking states, respectively. The lock block 340 is provided with a fifth spring 343 that forces the lock block 340 to switch to the first unlocking position, as detailed below.

[0056] The lock cylinder assembly 600 includes a rotating block 610 for actuating the lock block 340. In the locked position, the lock block 340 swings by rotating the rotating block 610, thus switching from the locked position to the second unlocked position.

[0057] The password assembly 300 includes an axle 370 perpendicular to the rotation surface of the password wheel 320. The password wheel 320 and a mating wheel 330 are sleeved on the axle 370. A code-changing switch 360 is provided at one end of the axle 370. A slider 380, which abuts against the code-changing switch 360 and is opened and closed by a locking block 340, is provided between the mating wheel 330 and the code-changing switch 360. The slider 380 is sleeved on the axle 370. When the password is correct, the code-changing switch 360 forces the slider 380 to press the mating wheel 330 away from the password wheel 320 along the axial direction of the axle 370, thus achieving code adjustment. In this embodiment, a code switching switch 360 is added, which can only switch codes when the code is correct. The axle 370 is provided with a sixth spring 371 that forces the mating wheel 330 and the code wheel 320 to be linked. The slider 380 is provided with a guide groove 381 for detecting whether the code is correct. When the code is correct, that is, when the lock block 340 is in the first unlock position, the side of the lock block 340 corresponds to the position of the guide groove 381. At this time, the slider 380 can be pushed. The linkage relationship between the code wheel 320 and the mating wheel 330 is the prior art and will not be described in detail here.

[0058] Instructions for use:

[0059] like Figure 13 As shown, in the locked state, due to the incorrect password, the limiting block 344 on the locking block 340 cannot be pressed into the limiting groove 332 of the mating wheel 330. Therefore, the locking block 340 is in the middle position, which is the locked position. The end of the locking block 340 blocks the travel path of the unlocking linkage 310, and the unlocking linkage 310 also prevents the push button 400 from unlocking.

[0060] like Figure 14As shown, when the password is correct, the limiting grooves 332 of all mating wheels 330 face the limiting block 344 of the lock block 340. The lock block 340 swings to the lower position under the action of the fifth spring 343, which is the first unlocking position. The end of the lock block 340 makes room for the unlocking linkage 310 to move. At this time, when the push button 400 is pressed, the lock groove 410 moves downward and disengages from the lock hook 500 to achieve unlocking.

[0061] like Figure 16 As shown, when the password is correct, flip the code switching switch 360 to press the slider 380 towards the mating wheel 330. The mating wheel 330 temporarily moves away from the password wheel 320, at which point the password wheel 320 can be switched. After the password wheel 320 has finished switching, flip the code switching switch 360 in the opposite direction, and the slider 380 is reset with the help of the sixth spring 371, and the code switching ends.

[0062] like Figure 15 As shown, when a key is needed to unlock, the rotating block 610 rotates with the lock cylinder assembly 600. The rotating block 610 swings the lock block 340 to the upper position, which is the second unlocking position. The lock block 340 once again avoids the unlocking linkage 310, giving the unlocking linkage 310 a space to move. At this time, when the push button 400 is pressed, the lock groove 410 moves downward and disengages from the lock hook 500 due to the contact linkage between the push button 400 and the unlocking linkage 310, thus unlocking.

[0063] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Simple modifications and substitutions made by those skilled in the art without departing from the spirit and scope of this utility model are within its protection scope.

Claims

1. A latch, characterized in that, It includes a main body (100) and a secondary body (200) for installation on one opening and closing side of the enclosure and hinged rotational engagement, and a locking hook (500) for installation on the other opening and closing side of the enclosure. The secondary body (200) is provided with a push button (400) for unlocking by disengaging from the locking hook (500). The main body (100) is provided with a password component (300) to prevent the push button (400) from unlocking. The password component (300) includes a password wheel (320) and a mating wheel (330) that are linked and engaged. When the password is correct, the push button (400) unlocks the lock by sliding within the secondary body (200).

2. The latch as described in claim 1, characterized in that, The push button (400) is located at the end of the sub-body (200), and the movement path formed by the reciprocating motion is parallel to the length direction of the latch.

3. A latch as described in claim 2, characterized in that, The sub-body (200) is provided with a groove (210) for limiting the reciprocating motion of the push button (400), and the push button (400) is provided with a locking groove (410) that cooperates with the locking hook (500). The sub-body (200) is engaged with the locking hook (500) along with the locking groove (410) to achieve the locking of the box.

4. A latch as described in claim 1, 2, or 3, characterized in that, The password component (300) includes an unlocking linkage (310) for preventing the push button (400) from sliding. The unlocking linkage (310) has a reciprocating motion path and is opened and closed by switching between correct and incorrect passwords in the password component (300).

5. A latch as described in claim 4, characterized in that, The unlocking linkage (310) is provided with a protrusion (311), and the push button (400) is provided with a slot (420) that matches the protrusion (311). The movement path formed by the reciprocating motion of the unlocking linkage (310) is perpendicular to the movement path formed by the reciprocating motion of the push button (400). When the password is correct, the projection surface of the protrusion (311) coincides with the slot (420), and the protrusion (311) is inserted into the slot (420) during the unlocking process of the push button (400).

6. A latch as described in claim 5, characterized in that, The rotating surfaces of the combination wheel (320) and the mating wheel (330) are parallel to the extended surface formed by the end face of the main body (100). It also includes a lock block (340) for preventing the unlocking linkage (310) from sliding to unlock. The lock block (340) is movably connected to the combination component (300) and achieves reciprocating motion through the conversion between the correct and incorrect combination of the combination component (300).

7. A latch as described in claim 6, characterized in that, A transmission block (350) is provided between the locking block (340) and the unlocking linkage (310) for transmitting power between the two, and the transmission block (350) is rotatably connected to the main body (100).

8. A latch as described in claim 7, characterized in that, The main body (100) is provided with a lock cylinder assembly (600), which includes a rotating block (610) for actuating the lock block (340). The lock is unlocked by rotating the rotating block (610).

9. A latch as described in claim 8, characterized in that, The mating wheel (330) is provided with a groove (331), and the locking block (340) is provided with a protrusion (341) that matches the groove (331). When the password is correct, the locking block (340) is engaged in the groove (331) through the protrusion (341) to achieve reciprocating motion on the password assembly (300). It also includes a code switching switch (360) that is rotatably connected to the mating wheel (330) and used to prevent the reciprocating motion of the locking block (340). The password wheel (320) and the mating wheel (330) are separated by the engagement of the code switching switch (360) to achieve code switching.

10. A latch as described in claim 4, characterized in that, The unlocking linkage (310) is provided with a stop part (312) to prevent the push button (400) from sliding. The push button (400) is provided with a stop part (430) adapted to the stop part (312). The unlocking linkage (310) and the push button (400) achieve a repulsive linkage through the cooperation of the stop part (312) and the stop part (430). The movement path formed by the reciprocating motion of the unlocking linkage (310) is parallel to the movement path formed by the reciprocating motion of the push button (400).

11. A latch as described in claim 10, characterized in that, The password component (300) includes a password wheel (320) and a mating wheel (330) that are linked together. The rotation surfaces of the password wheel (320) and the mating wheel (330) are perpendicular to the extension surface formed by the end face of the main body (100). It also includes a lock block (340) for preventing the unlocking linkage (310) from sliding to unlock. The lock block (340) is movably connected to the password component (300) and has a swing angle. The lock block (340) achieves reciprocating motion by switching between the correct and incorrect password of the password component (300).

12. A latch as described in claim 11, characterized in that, The lock block (340) has a first unlocking position, a locking position and a second unlocking position in sequence by swinging. The main body (100) is provided with a lock cylinder assembly (600). The locking position and the first unlocking position can be converted to each other by the correctness and error of the password. The locking position and the second unlocking position can be converted to each other by the cooperation of the lock cylinder assembly (600) and the lock block (340).

13. A latch as described in claim 12, characterized in that, The lock cylinder assembly (600) includes a rotating block (610) for actuating the lock block (340). In the locked position, the lock block (340) swings by rotating the rotating block (610) and achieves the conversion from the locked position to the second unlocked position.

14. A latch as described in claim 13, characterized in that, The password assembly (300) includes a wheel axle (370) perpendicular to the rotation surface of the password wheel (320). The password wheel (320) and the mating wheel (330) are sleeved on the wheel axle (370). One end of the wheel axle (370) is provided with a code switching switch (360). Between the mating wheel (330) and the code switching switch (360), there is a slider (380) that abuts against the code switching switch (360) and is opened and closed by a locking block (340). The slider (380) is sleeved on the wheel axle (370). When the password is correct, the code switching switch (360) achieves code switching by forcing the slider (380) to squeeze the mating wheel (330) away from the password wheel (320) along the axial direction of the wheel axle (370).

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