A chain lock

Abstract

This utility model aims to provide a chain lock with strong anti-theft properties, simple structure, and good resistance to violent prying, and adopts the following technology: A chain lock, wherein the lock seat has a connecting seat at the end away from the insertion end, and a connecting pin passes through the connecting seat; the end of the chain away from the lock pin is connected to the connecting pin; the lock body also includes a lock seat sleeve, which is sleeved on the outside of the lock seat, and the connecting pin extends and passes through the lock seat sleeve; one end of the lock seat sleeve forms a first closed end, and the first closed end has a first through hole for the lock pin to be inserted and removed; an outer sleeve is also sleeved on the outside of the lock seat sleeve, and one end of the outer sleeve forms a second closed end, and the second closed end has a second through hole for the lock pin to be inserted and removed; the outer sleeve and the lock seat sleeve are fixedly connected by a pin; the lock pin is shouldered with a boss, and the cross-sectional area of ​​the boss is larger than the cross-sectional area of ​​the second through hole.

Description

Technical Field

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

[0002] Chain locks are widely used for anti-theft locking of non-motorized vehicles such as electric bikes and bicycles. Existing chain locks often use steel balls or cylindrical pins to engage the lock cylinder, such as the chain lock head structure disclosed in patent CN120312042A, which uses cylindrical pins instead of steel balls for locking, thus improving the strength of the lock cylinder to some extent. However, this type of lock relies solely on the outer shell to protect the locking device, making it vulnerable to forced entry when locked. The outer shell can be easily pried open, exposing the internal locking mechanism. External forces can directly impact the internal locking components, leading to lock failure and a remaining weakness in anti-theft performance. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the shortcomings of the existing technology and provide a chain lock with strong anti-theft performance, simple structure and good resistance to violent prying.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a chain lock, comprising a lock body and a chain, wherein a lock seat and a lock cylinder are assembled in the lock body, one end of the chain is connected to a lock pin, one end of the lock seat is a plug-in end, the plug-in end allows the lock pin to be inserted and removed, a linkage component is provided in the lock body, the linkage component is linked with the lock pin to complete the unlocking or locking action, a connecting seat is provided at the end of the lock seat away from the plug-in end, a connecting pin is inserted in the connecting seat, and the end of the chain away from the lock pin is connected to the connecting pin; The lock body also includes a lock seat sleeve, which is fitted onto the outside of the lock seat. The connecting pin extends through and passes through the lock seat sleeve. The end of the lock seat sleeve near the insertion end forms a first closed end, which has a first through hole for inserting and removing the lock pin. The outside of the lock seat sleeve is also fitted with an outer sleeve that can cover the connection pin point. The end of the outer sleeve near the insertion end forms a second closed end, which has a second through hole for inserting and removing the lock pin. The outer sleeve and the lock seat sleeve are fixedly connected by a pin, which is staggered from the connecting pin. The locking post is provided with a boss on its shoulder, and the cross-sectional area of ​​the boss is larger than the cross-sectional area of ​​the second through hole.

[0005] By adopting the above technical solution, a lock seat sleeve is installed on the outside of the lock seat, and an outer sleeve is fitted over the lock seat sleeve to form a double-layer protective structure. This structure shields and protects the lock seat, lock cylinder, and connecting pin, preventing the connecting pin from being pried or sheared, and significantly improving anti-theft performance. The through holes at the closed ends of the double sleeves do not interfere with the insertion and removal of the lock pin, ensuring smooth insertion and preventing jamming. The outer sleeve and lock seat sleeve are fixed together by a pin, making assembly simple and the structure compact. Furthermore, the staggered arrangement of the pin and connecting pin ensures that even if the pin is damaged by external force, it will not directly cause the connecting pin to loosen, further enhancing anti-pry performance. The lock cylinder shoulder is equipped with a boss, and the cross-sectional area of ​​the boss is larger than that of the second through hole. When attempting to disassemble the outer sleeve by force, if the outer sleeve moves away from the second closed end, the second closed end itself forms an obstruction; if the outer sleeve moves towards the second closed end, the boss can constrain the movement of the outer sleeve, preventing it from being disassembled, thus improving the overall pry resistance of the double-layer sleeve and enhancing the tensile strength and locking stability of the lock. Furthermore, the boss can axially limit the lock cylinder, preventing it from excessively extending into the lock seat and causing locking jamming. This solution, while ensuring the lock cylinder and linkage components can normally complete locking and unlocking actions, improves the structural strength of the lock body from multiple dimensions, including external protection, lock cylinder limiting, and chain connection reinforcement, resulting in high reliability.

[0006] The present invention is further configured such that: the linkage component includes a locking element and a locking tongue; The plug end has grooves on both sides, and the locking member is movably assembled in the grooves; the opposite sidewalls of the two grooves have waist-shaped through holes for partial extension of the locking member, and the locking pin has a locking ring groove that matches the locking member; when the locking member moves to the waist-shaped through hole, its partial extension gets into the locking ring groove, thus locking the locking pin; when the partial extension of the locking member completely retracts from the waist-shaped through hole, the locking pin is released. The lock cylinder includes a keyhole end for key insertion and a bolt end. The bolt end is provided with a protruding rod. The bolt and the protruding rod work together to cover or open the groove, thereby controlling the extension of the partial extension section of the locking member to extend or retract from the waist-shaped through hole.

[0007] By adopting the above technical solution, grooves are provided on both sides of the lock seat insertion end to accommodate locking components. The locking components on both sides pass through the oblong through hole and engage with the locking ring groove of the lock pin to achieve locking. The locking components and the locking ring groove cooperate to form a self-locking structure. The symmetrical locking on both sides makes the locking force more balanced, resulting in excellent tensile strength and pry resistance. When the lock pin is pulled outward by external force, the lock pin can further press the locking components, producing a self-locking effect that tightens as it is pulled, significantly improving the lock's pull resistance. At the same time, it can form a radial limit on the lock pin, effectively preventing the lock pin from shaking and increasing the locking stability. The lock tongue and the convex rod work together to cover or open the groove opening to control the extension or retraction of the locking components. The overall mechanical transmission structure is simple and compact, with few parts, convenient assembly, and low production cost. In the locked state, the latch closes the groove, which not only prevents dust and foreign objects from entering the groove and causing jamming, but also limits the locking parts from being knocked back by external force, effectively improving the ability to prevent forced unlocking; in the unlocked state, the groove opens to release the movement space of the locking parts, and the locking parts can smoothly retract inward, ensuring smooth insertion and removal of the lock pin and sensitive unlocking.

[0008] The present invention is further configured such that: the latch includes a movable plate located at the end of the latch, the end of the movable plate away from the protruding rod extends into both sides of the insertion end to form a shielding plate; the movable plate is provided with a sliding hole for the protruding rod to move and avoid; the lock seat is provided with limiting protrusions on both sides of the latch end, and the limiting protrusions on both sides together form a guide channel; the rotation of the lock cylinder drives the protruding rod to rotate synchronously, the protruding rod cooperates with the sliding hole, drives the movable plate to make linear reciprocating motion along the guide channel, thereby driving the shielding plate to shield or open the groove.

[0009] By adopting the above technical solution, when the lock cylinder rotates, the convex rod rotates synchronously with the lock cylinder. Through its cooperation with the sliding hole, the rotational motion of the convex rod is converted into the linear reciprocating motion of the moving plate, resulting in a simple and reliable transmission conversion structure. The moving plate slides within the guide channel formed by the locking seat's limiting protrusion, ensuring stable guidance during the sliding process and effectively preventing the moving plate from deviating. The moving plate branches off to extend a shielding plate, which can simultaneously shield or open the grooves on both sides, ensuring good synchronization of actions on both sides. The entire linkage component is integrated inside the lock body, occupying little space, facilitating assembly, and stably controlling the movement space of the locking components, ensuring accurate locking and unlocking actions.

[0010] The present invention is further configured such that the end of the shielding plate that cooperates with the locking member is provided as an inclined end face.

[0011] By adopting the above technical solution, the mating end of the shielding plate and the locking component is set as an inclined end face. During the linear movement of the moving plate, the inclined end face can form an inclined pushing fit with the locking component, and the locking component is smoothly pushed along the groove with the help of the inclined guide. When locking, the shielding plate moves towards the groove opening, the inclined end face presses against the locking component, driving the locking component to extend through the waist-shaped through hole and lock into the locking ring groove of the lock pin; when unlocking, the shielding plate is removed from the groove opening, the inclined end face releases the pressing constraint on the locking component, and the locking component can smoothly retract inward. The inclined fit can reduce the frictional resistance between the shielding plate and the locking component, making the movement smooth, reducing the risk of mechanism jamming, and realizing a smooth transition from the linear translational movement of the shielding plate to the radial extension and retraction movement of the locking component.

[0012] The present invention is further configured such that: a sleeve end cap is fitted on one end of the outer sleeve near the connecting seat, and the sleeve end cap has a third through hole for the chain to extend out; a lock shell is also fitted on the outside of the outer sleeve.

[0013] By adopting the above technical solution, a sleeve end cap is installed at the end of the outer sleeve near the connecting seat. A third through hole is provided on the sleeve end cap for the chain to pass through, which not only meets the chain's movement requirements but also provides a seal and protection at that end, reducing the entry of dirt into the sleeve from the end and improving the protective effect. A lock shell is then fitted onto the outside of the outer sleeve. The lock shell fully covers and shields the sleeve end cap, pin, and outer sleeve, further enhancing the overall protection level, concealing assembly gaps, reducing the possibility of external force directly prying open the internal sleeve components, and improving the lock's appearance, structural integrity, and resistance to damage.

[0014] The present invention will now be further described with reference to the accompanying drawings. Attached Figure Description

[0015] Figure 1 This is a perspective view of the present invention; Figure 2 This is a side view of the present invention; Figure 3 yes Figure 2 Sectional view of AA; Figure 4 yes Figure 2 Sectional view of BB; Figure 5 This is a schematic diagram of the locking pin structure; Figure 6 This is a schematic diagram of the internal structure of this utility model. Figure 1 ; Figure 7 This is a schematic diagram of the locking tongue structure; Figure 8 This is a schematic diagram of the internal structure of this utility model. Figure 2 ; Figure 9This is a schematic diagram of the lock base; Figure 10 This is a schematic diagram of the partially exploded structure after the lock shell has been removed.

[0016] Explanation of reference numerals in the attached figures 1. Chain; 2. Lock base; 21. Limiting protrusion; 22. Guide channel; 23. Insertion end; 231. Groove; 232. Waist-shaped through hole; 3. Lock cylinder; 31. Keyhole end; 32. Lock tongue end; 4. Protruding rod; 5. Lock pin; 51. Locking ring groove; 52. Boss; 6. Locking component; 61. Partially protruding section; 7. Lock tongue; 71. Moving plate; 711. Sliding hole; 72. Cover plate; 8. Connecting seat; 81. Connecting pin; 9. Lock base sleeve; 91. First closed end; 92. First through hole; 10. Outer sleeve; 101. Second closed end; 102. Second through hole; 11. Pin; 12. Sleeve end cap; 121. Third through hole; 13. Lock shell; 14. Lock body. Detailed Implementation

[0017] In the description of this application, it should be understood that the terms "upper", "lower", "bottom", "top", "front", "back", "inner", "outer", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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 application.

[0018] Furthermore, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within 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.

[0019] The following will refer to the appendix in the embodiments of this utility model. Figure 1-10 The technical solutions in the embodiments of this utility model are clearly and completely described herein. 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.

[0020] As attached Figure 1-10As shown, a chain lock includes a lock body 14 and a chain 1. The lock body 14 is equipped with a lock base 2 and a lock cylinder 3 disposed within the lock base 2. The lock cylinder 3 includes a keyhole end 31 for inserting a key and a bolt end 32. The bolt end 32 is provided with a protruding rod 4. Rotation of the lock cylinder 3 can drive the protruding rod 4 to rotate synchronously. One end of the chain 1 is connected to a locking pin 5. One end of the lock base 2 is a plug-in end 23, which allows the locking pin 5 to be inserted and removed. The lock body 14 is provided with a linkage component, which is linked and cooperates with the locking pin 5 to complete the unlocking or locking action.

[0021] The lock seat 2 is provided with a connecting seat 8 at the end away from the plug end 23, and a connecting pin 81 is inserted in the connecting seat 8. The end of the chain 1 away from the lock post 5 is connected to the connecting pin 81.

[0022] The lock body 14 also includes a lock seat sleeve 9, which is sleeved on the outside of the lock seat 2. The connecting pin 81 extends through the lock seat sleeve 9, which can firmly bind the lock seat sleeve 9 and the lock seat 2 together, effectively improving the overall structural rigidity and assembly consistency. It can effectively resist external impacts and violent prying, while forming a closed protection for the internal moving structure, blocking the intrusion of dust and moisture, reducing the probability of parts corrosion and jamming, and greatly improving the stability and durability of the lock.

[0023] The lock seat sleeve 9 forms a first closed end 91 near the insertion end 23, and the first closed end 91 has a first through hole 92 for the insertion and removal of the lock pin 5. The outer side of the lock seat sleeve 9 is also fitted with a shell sleeve 10 that can cover the position of the connecting pin 81. The end of the shell sleeve 10 near the insertion end 23 forms a second closed end 101, and the second closed end 101 has a second through hole 102 for the insertion and removal of the lock pin 5. The lock seat sleeve 9 and the shell sleeve 10 form a double-layer protective structure, which provides shielding protection for the lock seat 2, lock cylinder 3 and connecting pin 81, preventing the connecting pin 81 from being pried or sheared, and significantly improving the anti-theft performance. The through holes on the closed ends of the two sleeves are only for the lock pin 5 to pass through, and will not interfere with the insertion and removal of the lock pin 5. The insertion and removal of the lock pin 5 is smooth and not easy to get stuck.

[0024] The outer sleeve 10 and the lock seat sleeve 9 are fixedly connected by a pin 11, which makes assembly simple and the overall structure compact. The pin 11 and the connecting pin 81 are staggered, so even if the pin 11 is damaged by external force, it will not directly cause the connecting pin 81 to loosen, further enhancing the anti-pry performance.

[0025] The locking pin 5 is shoulder-mounted with a boss 52. The diameters of the first through hole 92 and the second through hole 102 are slightly larger than the outer diameter of the locking pin 5, and the cross-sectional area of ​​the boss 52 is larger than the cross-sectional area of ​​the second through hole 102. This ensures that the locking pin 5 can pass smoothly through the through hole, while also allowing the boss 52 to act as a limiting obstruction. When attempting to disassemble the outer sleeve 10 by force, if the outer sleeve 10 moves away from the second closed end 101, the second closed end 101 itself acts as an obstruction; if the outer sleeve 10 moves towards the second closed end 101, the boss 52 can constrain the movement of the outer sleeve 10, preventing it from being disassembled, thus improving the overall pry resistance of the double-layer sleeve and enhancing the tensile strength and locking stability of the lock. In addition, the boss 52 can axially limit the locking pin 5, preventing it from excessively extending into the lock seat 2 and causing locking jamming.

[0026] Optionally, the lock base 2 and the connecting seat 8 can be integrally formed to reduce assembly seams and decrease the entry point for external prying. When unlocking, the key turns the lock cylinder 3, causing the linkage component to release the locking constraint on the lock pin 5. The lock pin 5 is pulled outwards, passing through the second through hole 102 and the first through hole 92 in sequence, disengaging from the lock base 2's insertion end 23, thus completing the unlocking process. When locking, the lock pin 5 is aligned with the second through hole 102 and the first through hole 92 and inserted inwards. The lock pin 5 enters the lock base 2's insertion end 23, and turning the key causes the linkage component to lock, locking the lock pin 5 within the lock base 2.

[0027] Furthermore, the linkage assembly includes a locking member 6 and a locking tongue 7; the plug end 23 has grooves 231 on both sides, and the locking member 6 is movably assembled in the grooves 231; in this embodiment, the locking member 6 is preferably a cylinder, and the cylindrical locking member 6 has low sliding resistance and uniform force, which is conducive to stable sliding. The opposite sidewalls of the grooves 231 on both sides are provided with waist-shaped through holes 232 for partial extension of the locking member 6, and the locking pin 5 is provided with a locking ring groove 51 adapted to the locking member 6; the locking tongue 7 is linked with the protruding rod 4, which can cover or open the groove opening of the groove 231, thereby controlling the partial extension section 61 of the locking member 6 to extend or retract from the waist-shaped through hole 232.

[0028] When the locking member 6 moves to the waist-shaped through hole 232, its partial protrusion 61 is engaged in the locking ring groove 51, thereby locking the locking pin 5; when the partial protrusion 61 of the locking member 6 completely retracts from the waist-shaped through hole 232, the locking pin 5 is released.

[0029] The latch 7 includes a movable plate 71 located at the latch end 32. The end of the movable plate 71 away from the protruding rod 4 branches off to both sides of the insertion end 23 to form a shielding plate 72. The movable plate 71 has a sliding hole 711 that allows the protruding rod 4 to move and avoid obstacles. The length of the sliding hole 711 is adapted to the left and right movement distance of the protruding rod 4 to ensure smooth transmission without jamming. The lock seat 2 has limiting protrusions 21 on both sides of the latch end 32. The limiting protrusions 21 on both sides form a guide channel 22 to guide and constrain the movable plate 71, preventing the movable plate 71 from shifting or tilting. The rotation of the lock cylinder 3 drives the protruding rod 4 to rotate synchronously. The protruding rod 4 cooperates with the sliding hole 711 to drive the movable plate 71 to make linear reciprocating motion along the guide channel 22, thereby driving the shielding plate 72 to shield or open the groove 231.

[0030] Preferably, the end of the shielding plate 72 that cooperates with the locking member 6 is provided as an inclined end face. During the linear movement of the moving plate 71, the inclined end face can form an inclined pushing fit with the locking member 6, and the locking member 6 is smoothly pushed along the groove 231 with the help of the inclined guide. When locking, the shielding plate 72 moves towards the groove opening of the groove 231, and the inclined end face presses against the locking member 6, driving the locking member 6 to extend through the waist-shaped through hole 232 and lock into the locking ring groove 51 of the locking pin 5; when unlocking, the shielding plate 72 withdraws from the groove opening, the inclined end face releases the pressing constraint on the locking member 6, and the locking member 6 can smoothly retract inward. The inclined fit can reduce the frictional resistance between the shielding plate 72 and the locking member 6, making the movement smooth, reducing the risk of mechanism jamming, and realizing a smooth transition from the linear translational movement of the shielding plate 72 to the radial extension and retraction movement of the locking member 6.

[0031] The inner wall of the lock seat sleeve 9 and the outer wall of the insertion end 23 cooperate with each other, on the one hand forming an external limit for the lock tongue 7 to prevent the lock tongue 7 from falling off, and on the other hand limiting the maximum travel of the locking member 6 to avoid the locking member 6 completely falling out of the groove 231 and causing linkage failure, thus ensuring the stable operation of the internal linkage mechanism.

[0032] Furthermore, a sleeve end cap 12 is fitted onto one end of the outer sleeve 10 near the connecting seat 8. The sleeve end cap 12 has a third through hole 121 for the chain 1 to extend out, which not only meets the need for the chain 1 to move out, but also forms a sealing and protection at that end, reducing the amount of dirt entering the sleeve from the end and improving the protection effect.

[0033] A lock shell 13 is also fitted on the outside of the outer sleeve 10. The lock shell 13 can fully cover and shield the sleeve end cap 12, the pin 11 and the outer sleeve 10, further improving the overall protection level, shielding the assembly gaps, reducing the possibility of external force directly prying the internal sleeve components, and improving the appearance of the lock, as well as enhancing the overall structure and resistance to damage.

[0034] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., 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 chain lock, comprising a lock body (14) and a chain (1), wherein a lock seat (2) and a lock cylinder (3) disposed within the lock seat (2) are assembled therein, one end of the chain (1) is connected to a lock pin (5), one end of the lock seat (2) is a plug-in end (23) for inserting and removing the lock pin (5), and a linkage component is provided within the lock body (14), wherein the linkage component is linked and cooperates with the lock pin (5) to complete the unlocking or locking action, characterized in that: The lock seat (2) has a connecting seat (8) at one end away from the plug end (23), and a connecting pin (81) is inserted inside the connecting seat (8). The chain (1) is connected to the connecting pin (81) at one end away from the lock post (5). The lock body (14) also includes a lock seat sleeve (9), which is sleeved on the outside of the lock seat (2). The connecting pin (81) extends through the lock seat sleeve (9). The lock seat sleeve (9) forms a first closed end (91) near the insertion end (23). The first closed end (91) has a first through hole (92) for the lock pin (5) to be inserted and removed. The lock seat sleeve (9) is also sleeved on the outside of the outer shell sleeve (9) to cover the position of the connecting pin (81). The outer shell sleeve (10) forms a second closed end (101) near the insertion end (23). The second closed end (101) has a second through hole (102) for the lock pin (5) to be inserted and removed. The outer shell sleeve (10) and the lock seat sleeve (9) are fixedly connected by a pin (11). The pin (11) and the connecting pin (81) are staggered. The locking post (5) is provided with a boss (52) on its shoulder, and the cross-sectional area of ​​the boss (52) is larger than the cross-sectional area of ​​the second through hole (102).

2. A chain lock according to claim 1, characterized in that: The linkage component includes a locking element (6) and a locking tongue (7); The plug end (23) has grooves (231) on both sides, and the locking member (6) is movably assembled in the grooves (231); the opposite sidewalls of the grooves (231) on both sides have waist-shaped through holes (232) for partial extension of the locking member (6); the locking post (5) has a locking ring groove (51) that matches the locking member (6); when the locking member (6) moves to the waist-shaped through hole (232), its partial extension (61) is inserted into the locking ring groove (51) to lock the locking post (5); when the partial extension (61) of the locking member (6) is completely withdrawn from the waist-shaped through hole (232), the locking post (5) is released. The lock cylinder (3) includes a keyhole end (31) for inserting a key and a bolt end (32). The bolt end (32) is provided with a protruding rod (4). The bolt (7) and the protruding rod (4) work together to cover or open the groove (231), thereby controlling the partial protrusion section (61) of the locking member (6) to extend or retract from the waist-shaped through hole (232).

3. A chain lock according to claim 2, characterized in that: The latch (7) includes a movable plate (71) located at the latch end (32). The movable plate (71) extends from the end away from the protrusion (4) to both sides of the insertion end (23) to form a shielding plate (72). The movable plate (71) is provided with a sliding hole (711) for the protrusion (4) to move and avoid. The lock seat (2) is provided with limiting protrusions (21) on both sides of the latch end (32). The limiting protrusions (21) on both sides enclose to form a guide channel (22). The lock cylinder (3) rotates and drives the protrusion (4) to rotate synchronously. The protrusion (4) cooperates with the sliding hole (711) to drive the movable plate (71) to make a linear reciprocating motion along the guide channel (22), thereby driving the shielding plate (72) to shield or open the groove (231).

4. A chain lock according to claim 3, characterized in that: The end of the shielding plate (72) that cooperates with the locking member (6) is provided as an inclined end face.

5. A chain lock according to claim 3 or 4, characterized in that: The outer sleeve (10) is fitted with a sleeve end cap (12) at one end near the connecting seat (8), and the sleeve end cap (12) has a third through hole (121) for the chain (1) to extend out; a lock shell (13) is also fitted on the outside of the outer sleeve (10).

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