A cryptographic folding lock

Abstract

The utility model discloses a kind of password folding locks of convenient operation, which is composed of a password lock and a folding chain. The password lock includes a lock body, a lock bolt and a password lock core. One end of the folding chain is a locking end connected to the lock body, and the other end is a plug-in lock end. The lock bolt is used to realize locking and unlocking. The lock body is provided with a communication latch cavity and an insertion cavity. The plug-in lock end can be inserted and removed in the insertion cavity, and a lock hole is provided on the plug-in lock end. The lock bolt slides in the latch cavity along a direction perpendicular to the insertion and removal direction. One end of the lock bolt can be inserted into the insertion cavity and cooperate with the lock hole. The password wheel group of the password lock core controls the position of the lock bolt. The first elastic member drives the lock bolt to be inserted into the insertion cavity. The plug-in lock end and the lock head inclined surface cooperate to push the lock head back. When the password is incorrect, the password wheel group presses the lock bolt, the lock head cannot be retracted, and the plug-in lock end is locked. When the password is correct, the position is released, the plug-in lock end is inserted and removed through the inclined surface to push the lock head back, and the elastic member drives the lock head to be locked after the plug-in lock end is inserted in place. This design eliminates the traditional manual button operation, and the locking or unlocking is completed by directly inserting and removing the plug-in lock end.

Description

Technical Field

[0001] This utility model relates to the field of lock technology, and in particular to a combination folding lock. Background Technology

[0002] There are many types of folding locks on the market. The mechanisms and structures of folding locks that realize the lock are different. Since the structure determines the function and performance of the product in addition to the properties of the material itself, the utility model patent with announcement number 204081706U and name "password folding lock" discloses a password folding lock that is opened by password. It includes a folding rod and a lock body. The first end of the folding rod is connected to the lock body. A keyhole and an opening are provided at the second end of the folding rod, communicating with each other. A receiving cavity with an open opening is provided on the side wall of the lock body, allowing the second end of the folding rod to be inserted into the receiving cavity. It also includes a mechanical combination lock mechanism, a latch, and a button. The latch consists of a base and a head, and is installed inside the lock body. The latch passes through the receiving cavity in a direction perpendicular to the insertion of the second end of the folding rod, and forms a sliding fit with the lock body. The mechanical combination lock mechanism is installed inside the lock body and has a spindle. The spindle forms a pressing fit with the latch. The button is fixedly connected to the latch and is exposed outside the lock body. Therefore, it uses a latch inside the lock body to lock the folding rod. After the combination is correctly set, the button needs to be pressed to unlock, resulting in multiple operation steps and inconvenience. Utility Model Content

[0003] The purpose of this utility model is to overcome the defects of the prior art. This utility model provides a combination folding lock. When the combination is correct, the locking end of the combination folding lock can be directly inserted and pulled to lock and unlock.

[0004] The technical solution of this utility model is as follows: A combination folding lock includes a combination lock and a folding chain. The combination lock includes a lock body, a bolt, and a combination lock cylinder. One end of the folding chain is a locking end, and the other end is a locking end. The locking end is connected to the lock body, and the locking end is locked or unlocked by the bolt.

[0005] The lock body has a connected latch cavity and a locking cavity. The locking end is inserted into the locking cavity and has a lock hole. The latch is slidably disposed in the latch cavity along a direction perpendicular to the insertion and removal direction of the locking end. The lock head at one end of the latch can extend into or retract from the locking cavity and cooperate with the lock hole. The combination lock cylinder includes a combination wheel set and a first elastic element. The combination wheel set is used to limit or release the locking of the latch. The first elastic element drives the lock head to extend into the locking cavity. The locking end cooperates with the inclined surface of the lock head, so that the lock head can be pushed into the latch cavity when the locking end is inserted or removed.

[0006] When the password is incorrect, the combination wheel set presses against the latch to limit the lock, preventing the lock head in the cavity from sliding back into the latch cavity and thus maintaining its engagement with the keyhole and preventing the lock end from being pulled out.

[0007] When the password is correct, the combination wheel releases the lock bolt. When the mortise lock is inserted or removed, the lock head in the mortise cavity is pushed into the latch cavity by the inclined surface. After the mortise lock is inserted into place, the first elastic element drives the lock head to extend into the lock hole and lock.

[0008] By adopting the above technical solution, the combination folding lock provided by this utility model has the advantages of simple structure and convenient operation. Compared with the traditional combination folding lock, which requires manual pressing of a button to unlock after the correct password, the combination folding lock of this utility model can be directly inserted and pulled out to lock and unlock when the password is correct, greatly improving the convenience of use. When the password is correct, the combination wheel group will release the limit on the latch, and during the insertion and removal process, the locking head in the insertion cavity will be pushed into the latch cavity through the inclined surface. At this time, the locking end can be pulled out at will to unlock. At the same time, by setting the cooperation structure of the combination lock cylinder and the latch, the security and reliability of the lock are effectively guaranteed.

[0009] A further feature of this invention is that the lock head has a first guide slope and a second guide slope on both sides. When the password is correctly inserted into the mortise lock end, the end face of the mortise lock end presses against the first guide slope of the lock head, pushing the lock head into the latch cavity. When the mortise lock end is pulled out, the inner wall of the lock hole of the mortise lock end presses against the second guide slope of the lock head, pushing the lock head into the latch cavity.

[0010] With the above-mentioned further configuration, first and second guide ramps are provided on the lock head, so that when the locking end is inserted, the lock head is automatically pushed back by squeezing the first guide ramp, and the elastic element drives the lock head to lock after it is inserted into place; when pulled out, the lock head is pushed back by squeezing the second guide ramp on the inner wall of the lock hole, without the need for additional manual operation of the latch, which further improves the smoothness and operation feel of the locking end insertion and removal process.

[0011] A further feature of this invention is that the lock body has a core, the combination wheel assembly includes an inner wheel and combination wheels mounted outside the core, the inner wheel has a notch, and the latch has a protrusion that matches the notch.

[0012] When the password is incorrect, the password wheel rotates in conjunction with the inner wheel until the notch is misaligned with the protrusion. The inner wheel then blocks the protrusion, preventing the latch from sliding in the unlocking direction.

[0013] When the password is correct, the password wheel rotates in conjunction with the inner wheel until the notch aligns with the protrusion. The inner wheel then releases its obstruction of the protrusion, allowing the latch to slide in the unlocking direction, thereby driving the lock head from the insertion cavity into the latch cavity.

[0014] By employing the aforementioned further design, a linkage structure between the combination wheel assembly and the inner wheel is used. Limit control is achieved through the interaction between the inner wheel's notch and the bolt's protrusion: when the combination is incorrect, the inner wheel blocks the protrusion, preventing the bolt from moving; when the combination is correct, the notch aligns with the protrusion, allowing the bolt to slide. This structure precisely controls the bolt's position based on the combination, enhancing the reliability and security of the combination lock cylinder.

[0015] A further feature of this invention is that the shaft core is hollow to form a latch cavity, and a sliding opening is provided on the outer wall. The latch is slidably disposed in the latch cavity, and the protrusion is slidably disposed in the sliding opening.

[0016] By adopting the above-mentioned further configuration, the latch cavity is integrated into the inside of the shaft core, and the sliding of the latch protrusion is guided by the sliding groove on the outer wall of the shaft core. This not only provides a stable sliding guide for the latch, but also simplifies the internal structural layout of the lock body. At the same time, the end of the shaft core directly forms a cavity, which enhances the integration of components and structural stability.

[0017] A further feature of this invention is as follows: the combination lock includes a password reset key, the end of which is exposed outside the lock body. The inner wheel can slide axially along the shaft core. The combination wheel and the inner wheel achieve axial sliding engagement and circumferential linkage through a snap-fit ​​structure. When the password reset key is pressed by an external force, it can push the inner wheel to slide relative to the combination wheel, causing the snap-fit ​​structure to disengage and release the circumferential linkage between the combination wheel and the inner wheel. When the external force is removed, the inner wheel is driven by a second elastic element to slide back to its original position, causing the snap-fit ​​structure to engage and restore the circumferential linkage between the combination wheel and the inner wheel. The password reset key can also be rotated.

[0018] By employing the aforementioned further design, the circumferential linkage between the password wheel and the inner wheel is controllable through the cooperation of the password reset button, the second elastic element, and the snap-fit ​​structure: pressing the password reset button disengages the linkage, allowing the password wheel to be adjusted and a new password set; releasing it automatically resets the linkage, ensuring convenient and reliable password adjustment operations and meeting the user's need for custom passwords. Furthermore, the password reset button can rotate freely and has an anti-drilling function; during drill bit operation, it rotates with the drill bit to prevent damage.

[0019] A further feature of this invention is that the insertion cavity and the password reset key are respectively located at both ends of the lock body, the lock head at one end of the latch corresponds to the insertion cavity, and the first elastic element is located between the other end of the latch and the password reset key.

[0020] By adopting the above-mentioned further configuration, the mortise cavity and the password reset key are located at opposite ends of the lock body, and the first elastic element is located between the other end of the latch and the password reset key. This makes the direction of the driving force of the elastic element on the latch more reasonable, while optimizing the internal space layout of the lock body, avoiding interference between components, and improving the compactness and stability of the overall structure.

[0021] A further feature of this invention is as follows: one end of the lock body is provided with an assembly head, the locking end of the folding chain is sleeved on the assembly head and abuts against the outer retaining ring of the assembly head and the corresponding end face of the lock body to form axial positioning; the lock body is provided with a through hole, and the outer periphery of the assembly head is provided with an annular groove corresponding to the through hole, and a pin passes through the through hole and the annular groove to form an axial connection between the assembly head and the lock body; the assembly head can prevent the password reset key from disengaging, and the password reset key is axially slidingly engaged with the assembly head and circumferentially rotating engaged.

[0022] By adopting the above-mentioned further design, the axial detachment of the locking end is effectively prevented through the cooperation of the outer retaining ring of the assembly head and the lock body. The locking end can rotate circumferentially, which improves the safety and reliability of the lock. At the same time, the cooperation between the through hole and the annular groove, as well as the insertion of the pin, makes the assembly head axially fixed and circumferentially rotateable. The assembly head can rotate at will and has an anti-sawing function. When sawing, the password reset key will rotate on its own to make the saw slip, preventing criminals from using saws or other tools to damage it. Of course, it can also prevent drilling.

[0023] A further feature of this invention is that the lock head has a metal reinforcing surface layer, the reinforcing surface layer has a beveled abutment, and the lock head surface has a latch. One end of the beveled abutment is connected to the reinforcing surface layer, and the other end extends into the latch and abuts against the inner wall of the latch, thereby preventing the reinforcing surface layer from detaching from the lock head.

[0024] By employing the aforementioned further design, the cooperation between the inclined abutment and the latch achieves a secure connection between the reinforced surface and the lock cylinder, effectively preventing the reinforced surface from detaching and enhancing the durability and security of the lock cylinder. Simultaneously, the metal reinforced surface increases the hardness and wear resistance of the lock cylinder, extending the lock's lifespan. Furthermore, this design simplifies the lock cylinder's structure, reduces production costs, and makes the lock more economical and practical.

[0025] A further feature of this invention is that the folding chain is composed of several rods that are hinged together end to end.

[0026] With the above-mentioned further design, the folding chain is composed of multiple rods hinged at both ends, which allows the chain to be folded and stored flexibly, reducing the space occupied when not in use. At the same time, the hinged structure ensures that the chain can stably surround and lock the object after it is unfolded, taking into account both portability and practicality.

[0027] A further feature of this invention is that the two rods are connected by a hinge assembly, which includes a pin and a bushing. The bushing passes through the hinge portion of the two rods, and the pin passes into the bushing and is rotatable. The pin is provided with a first stop plate, and the bushing is provided with a second stop plate. The first stop plate and the second stop plate abut against the outer sides of the two rods respectively, thereby restricting the axial separation of the two rods.

[0028] With the above-mentioned further design, the pin and bushing cooperate, and the addition of the first and second stop plates effectively prevent the axial disengagement of the rods at the hinge points, greatly improving the structural stability and safety of the folding chain, and facilitating the relative rotation of the two rods. The pin can rotate freely and has anti-sawing and anti-drilling functions. Attached Figure Description

[0029] Figure 1 This is a structural diagram of a specific embodiment of the present utility model;

[0030] Figure 2 This is an internal structural diagram of a specific embodiment of the present utility model;

[0031] Figure 3 This is a structural diagram of a folding chain according to a specific embodiment of the present invention;

[0032] Figure 4 This is a structural diagram of a combination lock according to a specific embodiment of the present utility model;

[0033] Figure 5 This is a structural diagram of the internal structure of a combination lock according to a specific embodiment of the present utility model, where arrow a indicates the sliding unlocking direction of the latch;

[0034] Figure 6 This is an exploded view of the combination lock according to a specific embodiment of the present invention;

[0035] Figure 7 This is an assembly diagram of the cipher wheel assembly according to a specific embodiment of the present utility model;

[0036] Figure 8 This is a structural diagram of the shaft core according to a specific embodiment of the present utility model;

[0037] Figure 9 This is a diagram of the latch structure according to a specific embodiment of the present utility model;

[0038] Figure 10 This is an exploded view of the latch and the reinforced surface layer in a specific embodiment of this utility model;

[0039] Figure 11 This is an assembly diagram of the latch and the reinforced surface layer in a specific embodiment of the present invention;

[0040] Figure 12 This is a structural diagram of one set of latch combination wheel groups according to a specific embodiment of the present utility model;

[0041] Figure 13 This is a structural diagram of the assembly head according to a specific embodiment of the present utility model;

[0042] Figure 14 This is an assembly drawing of the two rods in a specific embodiment of this utility model.

[0043] In the diagram: 1. Combination lock; 2. Folding chain; 11. Lock body; 111. Inner shell; 112. Outer shell; 112. Latch; 12. Lock head; 121. Combination lock cylinder; 13. Locking end; 21. Latent end; 22. Lock hole; 221. Rod; 23. Latch cavity; 1A. Latent cavity; 1B. Combination wheel assembly; 131. First elastic element; 132. First guide slope; 1211. Second guide slope; 1212. Shaft core; 10. Slide opening; 101. Inner wheel; 1311. Combination wheel; 1312. Notch; 13111. Protrusion; 122. Combination reset key; 14. Second elastic element; 15. Assembly head; 16. Outer retaining ring; 161. Annular groove; 162. Through hole; 1111. Reinforced surface layer; 17. Angled abutment; 171. Bayonet; 1213. Hinge assembly; 18. Pin; 181. Bushing; 182. First stop plate; 1811. Second stop plate; 1821. Detailed Implementation

[0044] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0045] like Figure 1-14 As shown, this utility model discloses a combination folding lock, including a combination lock 1 and a folding chain 2. The folding chain 2 is composed of several rods 23 that are hinged end to end. Two rods 23 are connected by a hinge assembly 18. The hinge assembly 18 includes a pin 181 and a bushing 182. The bushing 182 passes through the hinge part of the two rods 23. The pin 181 passes into the bushing 182 and is rotatable. The pin 181 is provided with a first baffle 1811, and the bushing 182 is provided with a second baffle 1821. The first baffle 1811 and the second baffle 1821 respectively abut against the outer side of the two rods 23, thereby restricting the axial separation of the two rods 23.

[0046] The combination lock 1 includes a lock body 11, a latch 12, and a combination lock cylinder 13. One end of the folding chain 2 is a locking end 21, and the other end is a locking end 22. The locking end 21 is connected to the lock body 11, and the locking end 22 is locked or unlocked by the latch 12.

[0047] The lock body 11 has a connected latch cavity 1A and a locking cavity 1B. The locking end 22 is inserted into the locking cavity 1B and has a lock hole 221. The latch 12 is slidably disposed in the latch cavity 1A along a direction perpendicular to the insertion and removal direction of the locking end. The lock head 121 at one end of the latch 12 can extend into or retract from the locking cavity 1B and engage with the lock hole 221. The combination lock cylinder 13 includes a combination wheel set 131 and a first elastic element 132. The combination wheel set 131 is used to limit or release the locking of the latch 12, and the first elastic element 132 drives the lock head 121 to extend into the locking cavity 1B. Cavity 1B, the locking end 22 is engaged with the inclined surface of the lock head 121, so that the lock head 121 can be pushed into the latch cavity 1A when the locking end 22 is inserted or removed. The lock head 121 is provided with a metal reinforcing surface layer 17, and the reinforcing surface layer 17 is provided with an inclined abutment 171. The surface of the lock head 121 is provided with a bayonet 1213. One end of the inclined abutment 171 is connected to the reinforcing surface layer, and the other end extends into the bayonet and abuts against the inner wall of the bayonet, thereby preventing the reinforcing surface layer 17 from detaching from the lock head 121. The reinforcing surface layer 17 is integrally connected to the lock head 121, or the lock head is an integral metal structure.

[0048] When the password is incorrect, the password wheel assembly 131 presses against the latch 12 to limit the movement of the lock head 121 in the cavity 1B, preventing the lock head 121 in the cavity 1B from sliding back into the latch cavity 1A and thus maintaining its engagement with the lock hole 221 and preventing the lock end 22 from being pulled out.

[0049] When the password is correct, the password wheel assembly 131 releases the limit on the latch 12. When the locking end 22 is inserted or removed, the locking head 121 in the insertion cavity 1B is pushed into the latch cavity 1A through the inclined surface. After the locking end 22 is inserted into place, the locking head 121 is driven by the first elastic element 132 to extend into the lock hole 221 and lock. The elastic element is a spring.

[0050] Specifically, the lock head 121 has a first guide slope 1211 and a second guide slope 1212 on both sides. When the correct password is inserted into the latch end 22, the end face of the latch end 22 presses against the first guide slope 1211 of the lock head 121, pushing the lock head 121 into the latch cavity 1A. When the latch end 22 is pulled out, the inner wall of the lock hole 221 of the latch end 22 presses against the second guide slope 1212 of the lock head 121, pushing the lock head 121 into the latch cavity 1A. Alternatively, the latch end may have a guide slope.

[0051] Specifically, the lock body 11 is provided with a shaft core 10, which is fixed or integrally set with the lock body. The combination wheel set 131 includes an inner wheel 1311 and a combination wheel 1312 mounted outside the shaft core 10. The inner wheel 1311 is provided with a notch 13111. The latch 12 is provided with a protrusion 122 that matches the notch 13111. The combination wheel set 131 is provided with multiple sets.

[0052] When the password is incorrect, the password wheel 1312, in conjunction with the inner wheel 1311, rotates until the notch 13111 is misaligned with the protrusion 122. The inner wheel 1311 blocks the protrusion 122, thus restricting the latch 12 from sliding in the unlocking direction.

[0053] When the password is correct, the password wheel 1312, in conjunction with the inner wheel 1311, rotates to the notch 13111, which corresponds to the protrusion 122. The inner wheel 1311 then releases its obstruction of the protrusion 122, and the latch 12 can slide along the unlocking direction to drive the lock head 121 from the insertion cavity 1B into the latch cavity 1A.

[0054] The core 10 has a hollow interior forming a latch cavity 1A, and a sliding opening 101 is provided on its outer wall. The latch 12 is slidably disposed in the latch cavity 1A, and the protrusion 122 is slidably disposed in the sliding opening 101. The combination lock 1 includes a combination reset key 14, the end of which is exposed outside the lock body 11. The inner wheel 1311 can slide axially along the core 10. The combination wheel 1312 and the inner wheel 1311 are axially slidingly engaged and circumferentially linked through a snap-fit ​​structure. When the combination reset key 14 is pressed by an external force, it can push the inner wheel 1311 to slide relative to the combination wheel 1312, causing the snap-fit ​​structure to disengage and release the circumferential linkage between the combination wheel 1312 and the inner wheel 1311. When the external force is removed, the inner wheel 1311 is driven by the second elastic element 15 to slide back to its original position, causing the snap-fit ​​structure to engage and restore the circumferential linkage between the combination wheel 1312 and the inner wheel 1311. The locking structure includes a locking block 181 on the outer circumference of the inner wheel and a locking groove 182 on the inner circumference of the combination wheel. The locking block 181 slides axially into the locking groove 182, realizing circumferential linkage between the combination wheel 1312 and the inner wheel 1311. The combination reset key can also be rotated. The cavity 1B and the combination reset key 14 are respectively located at both ends of the lock body 11. The lock head 121 at one end of the latch 12 corresponds to the cavity 1B. The first elastic element 132 is located between the other end of the latch 12 and the combination reset key 14. The lock body 11 has an assembly head 16 at one end. The locking end 21 of the folding chain is sleeved on the assembly head 16 and abuts against the outer retaining ring 161 of the assembly head to form an axial positioning between the outer retaining ring 161 of the assembly head and the corresponding end face of the lock body. The lock body 11 has a through hole 1111, and the outer periphery of the assembly head 16 has an annular groove 162 corresponding to the through hole 1111. A pin passes through the through hole 1111 and the annular groove 162, forming an axial connection between the assembly head 16 and the lock body 11. The assembly head 16 can prevent the password reset key from disengaging. The password reset key is axially slidingly engaged with the assembly head and circumferentially rotating engaged. The lock body 11 includes a separate inner shell 111 and an outer shell 112.

[0055] The working principle of this utility model:

[0056] When the user enters a password, the combination of the password wheel and the inner wheel triggers a linkage mechanism. If the password is correct, all the notches on the inner wheel align in a straight line, and the notches on the inner wheel correspond to the corresponding protrusions on the latch. At this point, the latch can slide in the unlocking direction, causing the lock head to retract from the mortise cavity into the latch cavity. The mortise end can then be smoothly inserted into the mortise cavity. As the mortise end is further inserted, its end face presses against the first guide slope of the lock head, pushing the lock head into the latch cavity until the mortise end is fully inserted. Subsequently, the first elastic element drives the lock head to extend and engage with the keyhole, locking the mortise end. When the password is correct, during the process of pulling out the mortise end, the inner wall of the keyhole can press against the second guide slope of the lock head, pushing the lock head into the latch cavity. At this point, the mortise end can be pulled out.

[0057] By shuffling the combination wheels, the notches on all the inner wheels will not align in a straight line, and the notches on the inner wheels will be misaligned with the corresponding protrusions on the bolt. The inner wheels will block the protrusions, preventing the bolt from sliding to unlock. The lock head will remain locked in the keyhole, thus preventing the mortise from being pulled out and ensuring the lock's security. Similarly, when the combination is incorrect, attempting to insert the mortise will also prevent the lock head from being pushed into the bolt cavity.

[0058] Furthermore, when a user needs to adjust the password, they can press the password reset button to push the inner wheel relative to the password wheel, causing the locking mechanism to disengage and releasing the circumferential linkage between the password wheel and the inner wheel. After adjustment, releasing the password reset button allows the inner wheel to reset under the action of the second elastic element, the locking mechanism to re-engage, restoring the circumferential linkage between the password wheel and the inner wheel, thus completing the password reset.

[0059] It should be noted that in the description of this utility model, all directional indicators (such as up, down, forward, backward, etc.) are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0060] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. In the description of this utility model, "a number" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0061] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," and "installation" 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 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 utility model based on the specific circumstances.

Claims

1. A combination folding lock, comprising a combination lock (1) and a folding chain (2), wherein the combination lock (1) comprises a lock body (11), a latch (12) and a combination lock cylinder (13), one end of the folding chain (2) is a locking end (21) and the other end is a locking end (22), the locking end (21) is connected to the lock body (11), and the locking end (22) is locked or unlocked by the latch (12), characterized in that: The lock body (11) has a connected latch cavity (1A) and a insertion cavity (1B). The insertion end (22) is inserted into the insertion cavity (1B). The insertion end (22) has a lock hole (221). The latch (12) is slidably disposed in the latch cavity (1A) along a direction perpendicular to the insertion direction of the insertion end. The lock head (121) at one end of the latch (12) can extend into or retract from the insertion cavity (1B) and cooperate with the lock hole (221). The combination lock cylinder (13) includes a combination wheel assembly (131) and a first elastic element (132). The combination wheel assembly (131) is used to limit or release the locking of the latch (12). The first elastic element (132) drives the lock head (121) to extend into the insertion cavity (1B). The insertion end (22) cooperates with the inclined surface of the lock head (121) so that the lock head (121) can be pushed into the latch cavity (1A) when the insertion end (22) is inserted or removed. When the password is incorrect, the combination wheel assembly (131) presses against the latch (12) to limit the movement, and the lock head (121) in the mortise cavity (1B) cannot slide back into the latch cavity (1A), thus maintaining its engagement with the lock hole (221) and preventing the mortise end (22) from being pulled out. When the password is correct, the password wheel assembly (131) releases the limit on the latch (12). When the locking end (22) is inserted or removed, the locking head (121) in the insertion cavity (1B) is pushed into the latch cavity (1A) through the inclined surface cooperation. After the locking end (22) is inserted into place, the first elastic element (132) drives the locking head (121) to extend into the lock hole (221) to lock.

2. The combination folding lock according to claim 1, characterized in that: The lock head (121) is provided with a first guide slope (1211) and a second guide slope (1212) on both sides. When the password is correctly inserted into the mortise end (22), the end face of the mortise end (22) presses against the first guide slope (1211) of the lock head (121) and pushes the lock head (121) into the latch cavity (1A). When the mortise end (22) is pulled out, the inner wall of the lock hole (221) of the mortise end (22) presses against the second guide slope (1212) of the lock head (121) and pushes the lock head (121) into the latch cavity (1A).

3. The combination folding lock according to claim 1, characterized in that: The lock body (11) is provided with a core (10), and the combination wheel assembly (131) includes an inner wheel (1311) and a combination wheel (1312) mounted outside the core (10). The inner wheel (1311) is provided with a notch (13111), and the latch (12) is provided with a protrusion (122) that matches the notch (13111). When the password is incorrect, the password wheel (1312) is linked to the inner wheel (1311) and rotates to the notch (13111) to be offset from the protrusion (122). The inner wheel (1311) blocks the protrusion (122) and restricts the latch (12) from sliding in the unlocking direction. When the password is correct, the password wheel (1312) drives the inner wheel (1311) to rotate to the notch (13111) and align with the protrusion (122). The inner wheel (1311) releases its obstruction of the protrusion (122), and the latch (12) can slide along the unlocking direction to drive the lock head (121) from the insertion cavity (1B) into the latch cavity (1A).

4. The combination folding lock according to claim 3, characterized in that: The shaft core (10) is hollow inside to form a latch cavity (1A) and has a sliding opening (101) on its outer wall. The latch (12) is slidably disposed in the latch cavity (1A) and the protrusion (122) is slidably disposed in the sliding opening (101).

5. The combination folding lock according to claim 3, characterized in that: The combination lock (1) includes a password reset key (14), the end of which is exposed outside the lock body (11). The inner wheel (1311) can slide axially along the shaft (10). The combination wheel (1312) and the inner wheel (1311) are axially sliding and circumferentially linked through a snap-fit ​​structure. When the password reset key (14) is pressed by an external force, it can push the inner wheel (1311) to slide relative to the combination wheel (1312), causing the snap-fit ​​structure to disengage and release the circumferential linkage between the combination wheel (1312) and the inner wheel (1311). When the external force is removed, the inner wheel (1311) is driven by the second elastic element (15) to slide back, causing the snap-fit ​​structure to engage and restore the circumferential linkage between the combination wheel (1312) and the inner wheel (1311). The password reset key can also be rotated.

6. The combination folding lock according to claim 5, characterized in that: The insertion cavity (1B) and the password reset key (14) are respectively located at both ends of the lock body (11), the lock head (121) at one end of the latch (12) corresponds to the insertion cavity (1B), and the first elastic element (132) is located between the other end of the latch (12) and the password reset key (14).

7. The combination folding lock according to any one of claims 1-6, characterized in that: The lock body (11) has an assembly head (16) at one end. The locking end (21) of the folding chain is sleeved on the assembly head (16) and abuts against the outer retaining ring (161) of the assembly head and the corresponding lock body end face to form an axial positioning. The lock body (11) has a through hole (1111). The outer periphery of the assembly head (16) has an annular groove (162) corresponding to the through hole (1111). A pin passes through the through hole (1111) and the annular groove (162) to form an axial connection between the assembly head (16) and the lock body (11). The assembly head (16) can restrict the password reset key from disengaging. The password reset key is axially slidingly engaged with the assembly head and circumferentially rotating engaged.

8. The combination folding lock according to any one of claims 1-6, characterized in that: The lock head (121) is provided with a metal reinforcing surface layer (17), and a beveled abutment (171) is provided on the reinforcing surface layer (17). A latch (1213) is provided on the surface of the lock head (121). One end of the beveled abutment (171) is connected to the reinforcing surface layer, and the other end extends into the latch and abuts against the inner wall of the latch, thereby restricting the reinforcing surface layer (17) from detaching from the lock head (121).

9. The combination folding lock according to any one of claims 1-6, characterized in that: The folding chain (2) is composed of several rods (23) that are hinged together end to end.

10. The combination folding lock according to claim 9, characterized in that: The two rods (23) are connected by a hinge assembly (18), which includes a pin (181) and a bushing (182). The bushing (182) passes through the hinge part of the two rods (23). The pin (181) passes into the bushing (182) and is rotatable. The pin (181) is provided with a first baffle (1811), and the bushing (182) is provided with a second baffle (1821). The first baffle (1811) and the second baffle (1821) respectively abut against the outer side of the two rods (23), thereby restricting the axial separation of the two rods (23).

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