A chain lock

Abstract

The application discloses a chain lock and belongs to the field of locks. The chain lock solves the problem of unstable abutment between a lock catch steel ball and a chain movable end. The technical scheme for solving the problem mainly comprises a lock body and a chain. The lock body comprises a lock shell and a lock core. The lock shell is provided with a lock hole. The chain comprises a fixed end fixed to the lock shell and a movable end inserted into the lock hole. The lock shell is provided with a locking piece. The lock core drives the locking piece to lock the movable end in the lock hole. The locking piece comprises a locking column. The locking column is slidingly arranged on the lock shell and can be extended into an inner ring through hole of the movable end to lock the movable end or moved out of the inner ring through hole of the movable end to unlock the movable end. The sliding direction of the locking column is perpendicular to the length direction of the locking column. The lock core drives the locking column to slide to be extended into the inner ring through hole of the movable end. The locking column has at least two positions abutting against the hole wall of the inner ring through hole of the movable end. The application is mainly used for increasing the contact range between the locking piece and the movable end of the chain and improving the locking stability.

Description

Technical Field

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

[0002] A typical chain lock is primarily used to secure items to a fixed object, preventing them from being taken away arbitrarily. For example, it can be used to lock a bicycle or cart to a railing or post. The structure of a chain lock generally consists of a chain with interlocking locks at both ends. These locks are usually double-lock or padlocks, ensuring the secured item cannot be moved freely and preventing it from being taken away.

[0003] The prior art CN116556783A discloses a chain lock, including a lock shell, a lock cylinder seat, a lock cylinder, a fixed insert plate, a linkage, a torsion spring, a rotating seat, a locking seat, a positioning block, a compression spring, a cover plate, two screws, and a chain. The lock cylinder assembly is located inside the lock cylinder seat, the linkage is located inside the lock cylinder seat, the torsion spring is located between the lock cylinder seat and the linkage, the rotating seat is located on one side of the lock cylinder seat, the locking seat assembly is located on the rotating seat, the locking seat has a plug-in part located in the locking seat groove of the rotating seat, a positioning protrusion is provided on each side of the plug-in part, the rotating seat has two second notches, the two positioning protrusions are respectively located in the two second notches, the locking seat has a locking slot, the plug-in part has a steel ball receiving groove that penetrates the locking seat, and two locking steel balls are arranged opposite each other in the steel ball receiving groove. When using a chain lock to secure an item, after the movable end of the chain wraps around the item, insert the movable end of the chain into the locking slot. The movable end of the chain pushes the positioning block to move in the locking slot and compresses the spring, causing it to be in an elastic compressed state. The positioning block disengages from the locking seat, and the rotating seat rotates due to the elastic recovery of the torsion spring. The rotating seat drives the linkage to rotate, and the linkage drives the rotating seat to rotate. The steel ball groove of the rotating seat disengages from the corresponding steel ball receiving groove of the locking seat. The positioning block disengages from the notch of the locking seat as the rotating seat rotates. The inner wall of the rotating seat pushes the two locking steel balls inward and locks them into the movable end of the chain, thereby locking and positioning the movable end of the chain inside the lock case.

[0004] In existing technology, when locking the moving end of the chain, the locking ball is pushed to the moving end of the chain by a rotating base to lock the moving end of the chain. However, since the locking ball is spherical, when the outer peripheral wall of the locking ball contacts the inner wall of the moving end of the chain, it usually forms a point contact or a single and small-range arc surface contact. This results in unstable contact between the locking ball and the inner wall of the moving end of the chain. When the moving end of the chain is subjected to external force, it will generate a huge impact force on the locking ball, which can easily damage the locking ball and thus affect the stability of the chain lock when securing items. Summary of the Invention

[0005] The purpose of this invention is to provide a chain lock that solves the problem of unstable contact between the locking ball and the moving end of the chain, increases the contact range between the locking element and the moving end of the chain, and thus improves the locking stability.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a chain lock, comprising a lock body and a chain, the lock body comprising a lock shell and a lock cylinder, the lock shell having a lock hole, the chain comprising a fixed end fixed to the lock shell and a movable end inserted into the lock hole, the lock shell having a locking member, the lock cylinder driving the locking member to lock the movable end in the lock hole, the locking member comprising a locking pin, the locking pin being slidably disposed on the lock shell and extending into the inner ring through hole of the movable end to lock the movable end or moving out of the inner ring through hole of the movable end to unlock the movable end, the sliding direction of the locking pin being perpendicular to the length direction of the locking pin, the lock cylinder driving the locking pin to slide to extend into the inner ring through hole of the movable end, the locking pin having at least two points abutting against the hole wall of the inner ring through hole of the movable end.

[0007] After adopting the above technical solution, the present invention has the following advantages: When using a chain lock to secure an item, the movable end of the chain is wrapped around the item, so that the fixed end of the chain, the lock body, and the movable end of the chain encircle the item. Then, the movable end of the chain is inserted into the lock hole. After the movable end extends into the lock hole, the key drives the lock cylinder to rotate. The rotating lock cylinder drives the locking pin to slide and extend into the lock hole, so that the locking pin extends into the inner through hole of the movable end on the side facing the movable end, so that the locking pin abuts against the inner through hole in the direction in which the movable end leaves the lock hole. The locking pin engages with the inner through-hole wall at at least twice, thereby locking the movable end of the chain in the lock hole. Compared to existing technologies, this method of locking the movable end of the chain results in at least two points of contact between the locking pin and the inner through-hole wall. This increased contact area reduces the impact on the locking pin when the movable end of the chain is struck by external force, improving the stability of the locked chain and further enhancing the stability of the locked item. Furthermore, the at least two points of contact between the locking pin and the inner through-hole reduce the likelihood of the movable end of the chain wobbling when inserted into the lock hole due to a single contact area, thus reducing the possibility of the movable end accidentally disengaging from the lock hole.

[0008] Furthermore, the lock housing is provided with a guide hole that communicates with the lock hole. The guide hole is for the locking pin to be installed and fitted. The guide hole wall and the end face of the locking pin are provided with guide ribs and guide grooves to guide the sliding of the locking pin. The guide ribs are inserted into the guide grooves to simultaneously restrict the rotation of the locking pin.

[0009] Using the aforementioned technical solution, when the locking pin slides to lock or unlock the movable end, the guide ribs and guide grooves guide the locking pin to slide along the sliding direction of locking or unlocking the movable end, reducing the possibility of the locking pin deviating from the sliding path. In addition, the insertion of the guide ribs and guide grooves ensures that the lock cylinder can only slide and not rotate when it drives the locking pin to lock or unlock the movable end, reducing the impact of the locking pin's rotation on the stability of the movable end being locked or the unlocking efficiency when the movable end is unlocked. The restriction on the rotation of the locking pin improves the efficiency of the locking pin in locking or unlocking the movable end.

[0010] Furthermore, the guide rib has a first blocking surface, and the end face of the guide groove away from the lock hole is a second blocking surface. When the first blocking surface and the second blocking surface come into contact, the locking pin extends into the lock hole to lock the movable end.

[0011] Using the aforementioned technical solution, when one side of the locking pin extends into the inner ring through hole to lock the movable end, the first blocking surface abuts against the second blocking surface, ensuring that the range of the locking pin extending into the lock hole to lock the movable end is fixed, reducing the impact of the locking pin extending too far into the lock hole on the unlocking of the movable end. In addition, the abutment between the first blocking surface and the second blocking surface ensures that the range of the locking pin extending into the inner ring through hole is fixed, reducing the impact of the locking pin extending too far on the stability of locking the movable end, or reducing the impact of the locking pin extending too far on the difficulty of moving it out of the inner ring through hole, thus affecting the unlocking of the movable end.

[0012] Furthermore, the lock cylinder and the lock shell are covered by an outer shell, which blocks the locking pin when it exits the lock hole to prevent the locking pin from disengaging from the guide hole.

[0013] Using the aforementioned technical solution, when the movable end is unlocked, the lock cylinder releases its obstruction of the locking pin, pulls the movable end so that it disengages from the lock hole, the inner ring through hole abuts against the locking pin, and the locking pin slides and disengages from the lock hole under the abutment of the movable end. The outer shell blocks the locking pin on the outside of the lock cylinder and lock shell to prevent the locking pin from disengaging from the guide hole due to inertia, thereby reducing the possibility of damage to the lock body caused by forcefully unlocking the movable end.

[0014] Furthermore, the locking pins are provided in two and distributed on both sides of the lock hole and slide relative to each other. When the distance between the two locking pins is reduced to less than the diameter of the movable end, the movable end is locked. When the distance between the two locking pins is increased to greater than the diameter of the movable end, the movable end is unlocked.

[0015] Using the aforementioned technical solution, when the locking pins lock the movable end, both locking pins slide towards the movable end from both sides until both locking pins extend into the inner through hole and abut against the hole wall. When the movable end is locked, both sides are locked simultaneously, improving the stability of the movable end when locked and reducing the possibility that the instability of the movable end may affect the stability of the locked item. When locking the movable end of the chain, the distance between the two locking pins is less than the diameter of the movable end of the chain, ensuring that the two locking pins can lock the movable end of the chain relatively stably. When unlocking the movable end of the chain, the lock cylinder removes its obstruction of the locking pins, and the movable end of the chain is pulled, causing the two locking pins to slide in opposite directions, gradually disengaging from the hole wall of the inner through hole until the distance between the two locking pins is greater than the diameter of the movable end, thus unlocking the movable end of the chain. By locking the movable end from both sides with the two locking pins, the stability of the movable end when locked is improved, reducing the possibility of accidental unlocking of the movable end of the chain.

[0016] Furthermore, the surface of the locking pin facing the lock hole is provided with a circumferentially extending abutment surface, which maintains surface contact with the wall of the inner ring through hole of the movable end when the locking pin locks the movable end.

[0017] When the aforementioned technical solution is adopted, when the locking pin locks the movable end, the contact surface contacts the hole wall of the inner ring through hole, so that the locking pin and the hole wall of the inner ring through hole form a surface contact, increasing the contact area between the locking pin and the hole wall of the inner ring through hole, reducing the possibility of the locking pin disengaging from the hole wall of the inner ring through hole and causing accidental unlocking, thereby improving the stability of the locking pin locking the movable end.

[0018] Furthermore, the lock housing is provided with a movable transmission component. Driven by the lock cylinder, the transmission component pushes the locking pin to slide and lock the movable end of the chain. The transmission component can deviate from the sliding path of the locking pin to unlock the locking pin.

[0019] Using the aforementioned technical solution, when the lock cylinder and transmission component drive the locking pin to lock the movable end, the key drives the lock cylinder to rotate. The rotating lock cylinder drives the transmission component to move, and the moving transmission component pushes the locking pin, causing the locking pin to extend into the inner ring through hole on the side facing the movable end and abut against the hole wall of the inner ring through hole to lock the movable end. When the movable end needs to be unlocked, the lock cylinder drives the transmission component to deviate from the sliding path of the locking pin, pulling the chain movable end to make the movable end push the locking pin in the opposite direction, causing the locking pin to exit the inner ring through hole and the lock hole, thereby unlocking the movable end. The lock cylinder drives the locking pin to lock the movable end through the transmission component. During the process of locking the movable end, the transmission component blocks the sliding path of the locking pin, reducing the possibility of the locking pin accidentally unlocking the movable end. When unlocking the movable end, the lock cylinder drives the transmission component to deviate from the sliding path of the locking pin, reducing the possibility that the locking pin is blocked and affects the unlocking efficiency of the movable end.

[0020] Furthermore, the transmission component includes a rotating cam and a transmission frame. The rotating cam is connected to the lock cylinder and rotates with the lock cylinder. The transmission frame is rotatably mounted on the lock housing. The transmission frame is located between the rear end of the rotating cam and the locking pin. The lock cylinder drives the rotating cam to rotate, thereby pushing the transmission frame so that the transmission frame pushes the locking pin to lock the moving end of the chain. The transmission frame has a tendency to remain in contact with the rotating cam and move away from the locking pin.

[0021] Using the aforementioned technical solution, when the locking pin locks the movable end, the key drives the lock cylinder to rotate, causing the rotating cam to rotate and push the transmission frame. This causes the side of the transmission frame near the rotating cam to move away from the axis of the rotating cam, while the other end of the transmission frame rotates towards the sliding path of the locking pin and pushes the locking pin until it slides into the lock hole. When unlocking the movable end, the key first drives the lock cylinder to rotate, which in turn drives the rotating cam to rotate. The side of the transmission frame near the rotating cam, while maintaining its contact with the rotating cam, moves closer to the axis of the rotating cam. This causes the side of the transmission frame near the locking pin to deviate from the sliding path of the locking pin. Then, the movable end is pulled out, and the movable end abuts against the locking pin in the lock hole. The locking pin then slides away from the lock hole without the contact of the transmission component. This allows the moving end to be unlocked. When the moving end is locked, the transmission component always remains blocking the sliding path of the locking pin, reducing the possibility that the locking pin may accidentally unlock when the moving end is pulled out of the inner ring through hole. When the moving end is unlocked, the transmission frame, under the tendency of its abutting rotating cam, causes the other end of the transmission frame to deviate from the sliding path of the locking pin, reducing the possibility that the transmission frame may block the sliding of the locking pin during the unlocking process, thus reducing the influence of the resistance of the transmission frame during unlocking. Through the setting of the transmission frame and the rotating cam, the sliding of the locking pin is relatively smooth whether the moving end is unlocked or locked, improving the stability of the chain lock while reducing the possibility of spending too much time during use and thus reducing the locking efficiency.

[0022] Furthermore, the transmission frame includes an abutment part, a transition part, and a pushing part connected sequentially from front to back. The abutment part is located at the front end of the transmission frame and interacts with the rotating cam. The transition part is located in the middle of the transmission frame and is rotatably connected to the lock housing. The pushing part is located at the rear end of the transmission frame and interacts with the locking pin. There are two pushing parts and two transition parts, which are distributed on both sides of the lock housing.

[0023] Using the aforementioned technical solution, when locking the movable end, the rotating cam pushes the abutment part in a direction away from its axis, causing the transition part to rotate. This drives the pushing part to rotate toward the sliding path and push the locking pin, thereby pushing the locking pin into the inner ring through hole and abutting against the hole wall to lock the movable end. When unlocking the movable end, the rotating cam rotates, causing the abutment part to approach the axis of the rotating cam, and the pushing part to deviate from the sliding path of the locking pin, releasing the pushing part from obstructing the locking pin and facilitating the locking pin to unlock the movable end. The transmission frame is divided into an abutment part, a transition part, and a pushing part. The two transition parts and the two pushing parts push and block the two locking pins, improving the stability of the two locking pins locking the movable end.

[0024] Furthermore, the outer peripheral side of the locking pin includes a first guide surface and a second guide surface. The first guide surface is located on the outer side away from the lock hole and faces the transmission member, while the second guide surface is located on the inner side facing the lock hole and faces the movable end of the chain. The transmission member abuts against the first guide surface of the locking pin to push the locking pin into the lock hole, and the movable end of the chain abuts against the second guide surface to push the locking pin out of the lock hole.

[0025] Using the aforementioned technical solution, when the transmission component abuts against and pushes the locking pin, the transmission component abuts against the first guide surface. During the process of the transmission component pushing the locking pin, it slides along the first guide surface with the locking pin, reducing the possibility that the transmission component and the locking pin abut against each other in a direction perpendicular to the sliding direction of the locking pin, which would prevent the locking pin from sliding into the lock hole. When unlocking the movable end of the chain, after the transmission component deviates from the sliding path of the locking pin, it pulls the movable end of the chain, and the wall of the inner ring through hole abuts against the second guide surface, so that the movable end and the locking pin slide relative to each other along the second guide surface, reducing the impact of the locking pin and the movable end abutting against each other in a direction perpendicular to the sliding direction of the locking pin, which would affect the unlocking of the movable end. Through the setting of the first guide surface and the second guide surface, it is convenient for the transmission component to push the locking pin to lock the movable end and for the movable end to push the locking pin to unlock the movable end. Attached Figure Description

[0026] The present invention will be further described below with reference to the accompanying drawings:

[0027] Figure 1 This is a schematic diagram of the overall structure of a chain lock according to the present invention;

[0028] Figure 2 This is a schematic diagram of the installation of the chain and lock body of the present invention;

[0029] Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle;

[0030] Figure 4 This is a schematic diagram showing the contact between the locking pin and the wall of the inner ring through hole in this invention.

[0031] Figure 5-1This is a schematic diagram of the elliptical columnar structure of the locking post in this invention;

[0032] Figure 5-2 This is a schematic diagram showing the distribution of the first guide surface, the second guide surface, and the third guide surface of the locking post in this invention;

[0033] Figure 6 This is a schematic diagram of the contact between the first blocking surface and the second blocking surface in this invention;

[0034] Figure 7 This is an exploded schematic diagram of the two locking posts in this invention;

[0035] Figure 8 This is a schematic diagram showing the contact between the locking pin and the inner wall of the outer shell in this invention;

[0036] Figure 9 This is a schematic diagram of the transmission component in this invention. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0038] The terms "first," "second," etc. (if present) in the specification and claims of this invention are used to distinguish similar objects, not to describe a specific order or sequence. Even if "second" is used before a technical feature for distinction, it does not necessarily imply the presence of "first." It should be understood that in this invention, "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. It should be understood that in this invention, "a plurality of" refers to two or more. "And / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, X and / or Y can represent: X alone, X and Y simultaneously, and Y alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "Containing X, Y, and Z," "Containing X, Y, and Z" means that all three X, Y, and Z are included; "Containing X, Y, or Z" means that one of X, Y, and Z is included; "Containing X, Y, and / or Z" means that any one, two, or three of X, Y, and Z are included.

[0039] The technical solution of the present invention will be described in detail below with reference to specific embodiments. The following specific embodiments may be combined or substituted with each other according to the actual situation, and the same or similar concepts or processes may not be described again in some embodiments.

[0040] like Figure 1As shown, the present invention provides a chain lock, including a lock body 1 and a chain 2. The lock body 1 includes a lock cylinder 11 and a lock shell 12. The lock shell 12 is provided with a lock hole 121. The chain 2 includes a fixed end 21 and a movable end 22. The fixed end 21 is fixedly installed on the lock shell 12. The fixed end 21 can be fixed to the lock shell 12 by a fixing rod 211. Specifically, the fixing rod 211 is inserted into the fixed end 21, and then both ends of the fixing rod 211 are fixed to the lock shell 12 respectively, thereby fixing the fixed end 21 of the chain 2. Alternatively, the fixed end 21 can be welded to the lock shell 12 during the manufacturing of the chain lock to improve the structural strength between the fixed end 21 and the lock shell 12. The movable end 22 is inserted into the lock hole 121. The lock shell 12 is provided with a locking member 3. The lock cylinder 11 drives the locking member 3 to lock the movable end 22 inserted into the lock hole 121, thereby locking the movable end 22 in the lock hole 121.

[0041] In this embodiment, as Figure 2 and Figure 3 As shown, the locking component 3 includes a locking pin 31. A guide hole 122 is formed on the lock housing 12. The extension direction of the guide hole 122 is perpendicular to the insertion direction of the movable end 22 in the lock hole 121. The locking pin 31 is slidably installed in the guide hole 122. The sliding direction of the locking pin 31 is perpendicular to its length direction. When the locking pin 31 slides in the guide hole 122, it is driven by the lock cylinder 11. The movable end 22 of the chain 2 has an inner ring through hole 221. When the locking pin 31 slides towards the lock hole 121 under the drive of the lock cylinder 11, the side of the locking pin 31 facing the movable end 22 extends into the inner ring through hole 221, locking the movable end 22. After the lock cylinder 11 removes its obstruction of the locking pin 31, when the movable end 22 of the chain 2 is pulled to disengage from the lock hole 121, the movable end 22 pushes the locking pin 31 in the opposite direction, causing the locking pin 31 to move out of the inner ring through hole 221 and unlocking the movable end 22. Figure 4 As shown, when the locking pin 31 locks the movable end 22, it abuts against the wall of the inner ring through hole 221 of the movable end 22 at at least two points. Compared with the prior art CN116556783A, which uses a locking ball to lock the movable end 22, the contact between the locking pin 31 and the wall of the inner ring through hole 221 is no longer a point contact or a single and small-range arc surface contact. The locking pin 31 increases the contact range between the locking pin 31 and the inner ring through hole 221 by increasing the number of contact points, thereby improving the stability of the locking pin 31 when locking the movable end 22 and reducing the possibility of the locking pin 31 disengaging from the inner ring through hole 221 under external impact, thus improving the stability of the chain lock after securing the item. Furthermore, the at least two abutments between the locking pin 31 and the wall of the inner ring through hole 221 reduce the possibility of the movable end 22 swaying or shaking in the lock hole 121.

[0042] When using the chain lock, after the movable end 22 of the chain 2 is wrapped around the item, the movable end 22 is inserted into the lock hole 121. The lock cylinder 11 drives the locking pin 31 to slide on the lock shell 12 and extend into the lock hole 121. The locking pin 31, facing the center of the lock hole 121, extends into the inner ring through hole 221 to lock the movable end 22, thereby securing the item wrapped with the chain 2. When it is necessary to unlock the locked item, the lock cylinder 11 moves away from the sliding path of the locking pin 31, causing the lock cylinder 11 to disengage from the locking pin 31. Then, the movable end 22 is pulled along the unlocking direction of the movable end 22. The pulled movable end 22 pushes the locking pin 31 in the opposite direction of the sliding direction of the locking pin 31 in the lock hole 121, causing the locking pin 31 to move out of the inner ring through hole 221 and unlocking the movable end 22, thereby unlocking the chain lock.

[0043] like Figure 2 and Figure 3 As shown, in order to reduce the possibility of the locking pin 31 deviating from the sliding path, the guide hole 122 and the end face of the locking pin 31 are provided with guide ribs 32 and guide grooves 311 to guide the sliding of the locking pin 31. Specifically, guide ribs 32 are provided on both holes of the guide hole 122 distributed along the length of the locking pin 31, and guide grooves 311 are provided on the end faces of the locking pin 31 and the guide ribs 32 facing each other. When the locking pin 31 slides in the guide hole 122, the guide ribs 32 and the guide grooves 311 always remain in the insertion state. When the locking pin 31 slides, the sliding direction of the locking pin 31 is consistent with the extension direction of the guide ribs 32. The guide ribs 32 and the guide grooves 311 guide the sliding of the locking pin 31, reducing the possibility that the locking pin 31 deviates from the sliding path during the sliding process and cannot be inserted into the inner ring through hole 221 to lock the movable end 22. Since the locking pin 31 can be cylindrical, when the lock cylinder 11 drives the locking pin 31 to slide, the locking pin 31 may rotate. However, the insertion of the guide rib 32 and the guide groove 311 restricts the possibility of the locking pin 31 rotating during the process of being driven into the lock hole 121. This ensures that the locking pin 31 can accurately and smoothly extend into the inner ring through hole 221 to lock the movable end 22 during the process of sliding along the guide hole 122 to lock the movable end 22.

[0044] In another embodiment, such as Figures 2 to 6 As shown, the locking post 31 can be an elliptical column or other irregular column shape, such as... Figure 5-1As shown, when the locking pin 31 is an elliptical column, when it is installed in the guide hole 122, the major axis of the ellipse of the locking pin 31 extends along the sliding direction of the locking pin 31. When the locking pin 31 locks or unlocks the movable end 22, the lock cylinder 11 and the movable end 22 act on both sides of the locking pin 31 respectively. The axis of the locking pin 31 is located outside the inner ring through hole 221. When the movable end 22 is pulled to unlock, the movable end 22 acts on the inclined outer peripheral sidewall of the locking pin 31, which makes it easier for the movable end 22 to push the locking pin 31 out of the inner ring through hole 221 in the opposite direction, reducing the possibility of the locking pin 31 and the movable end 22 getting stuck. After the movable end 22 is fully unlocked, the axis of the locking pin 31 is located in the guide hole 122 and close to the lock cylinder 11. When the lock cylinder 11 drives the locking pin 31 to slide again, the lock cylinder 11 acts on the inclined surface of the locking pin 31, reducing the possibility of the lock cylinder 11 and the locking pin 31 getting stuck.

[0045] like Figures 3 to 6 As shown, to reduce the possibility that the locking pin 31 may extend too far or too little into the inner ring through hole 221, the guide rib 32 has a first blocking surface 321, and the end face of the guide groove 311 away from the lock hole 121 is a second blocking surface 312. Driven by the lock cylinder 11, the locking pin 31 gradually extends into the inner ring through hole 221 until the first blocking surface 321 and the second blocking surface 312 abut against each other. Only then does the locking pin 31 stop extending into the inner ring through hole 221, ensuring that the first blocking surface 321 and the second blocking surface 312 abut against each other. The insertion of the locking pin 31 is stopped, ensuring that the extent of the locking pin 31 extending into the inner ring through hole 221 is not too small, which would result in a poor locking effect on the movable end 22 and a possibility of accidental unlocking. At the same time, the contact between the first blocking surface 321 and the second blocking surface 312 reduces the continuous insertion of the locking pin 31 into the inner ring through hole 221, which would cause the locking pin 31 to extend too far, resulting in the movable end 22 being unable to push the locking pin 31 in the reverse direction to unlock the movable end 22 when unlocking, further affecting the unlocking of the chain lock.

[0046] To improve the stability of the movable end 22 when locked, the surface of the locking pin 31 facing the locking hole 121 is provided with a circumferentially extending abutment surface. When the locking pin 31 locks the movable end 22, the abutment surface remains in contact with the hole wall of the inner ring through hole 221 of the movable end 22, so that after the locking pin 31 extends into the inner ring through hole 221, a surface contact is formed between the abutment surface and the hole wall, increasing the contact area between the locking pin 31 and the hole wall of the inner ring through hole 221, thereby improving the stability of the movable end 22 when locked.

[0047] like Figure 7As shown, to improve the stability of the movable end 22 when locked, two locking pins 31 are provided. The two locking pins 31 are distributed on both sides of the lock hole 121 along the sliding direction of the locking pins 31. The corresponding lock shell 12 is provided with two guide holes 122. Each guide hole 122 is provided with a guide rib 32. Each locking pin 31 is provided with a guide groove 311. The guide groove 311 and the corresponding guide rib 32 are inserted into each other. When the movable end 22 is locked by the two locking pins 31, the two locking pins 31 move closer to each other under the simultaneous action of the lock cylinder 11 or move away from each other under the reverse push of the movable end 22. When the movable end 22 is locked, the two locking pins 31 move closer to each other until the distance between the two locking pins 31 is reduced to less than the diameter of the movable end 22, thereby blocking the movable end 22 in the lock hole 121 in the direction of disengagement from the lock hole 121. Additionally, the movable end 22 is locked by the blocking action of the locking pins 31 on both sides, reducing the possibility that the movable end 22 may be biased to one side of the lock hole 121, thus reducing its stability when locked. When unlocking the movable end 22, the lock cylinder 11 moves away from the sliding path of the locking pins 31, pulling the movable end 22. The movable end 22 pushes the locking pins 31 in the opposite direction until the distance between the two locking pins 31 increases to a size greater than the diameter of the movable end 22, at which point the movable end 22 is unlocked.

[0048] like Figure 8 As shown, in order to reduce the possibility that the locking pin 31 may completely detach from the guide hole 122 due to inertia, an outer shell 13 is provided to wrap around the outside of the lock cylinder 11 and the lock shell 12. The distance between the inner wall of the outer shell 13 and the outer wall of the lock shell 12 is less than the width of the locking pin 31. When the movable end 22 is unlocked, the locking pin 31 moves away from the lock hole 121 in the guide hole 122 and gradually abuts against the inner wall of the outer shell 13, reducing the possibility that the locking pin 31 may completely detach from the guide hole 122 after moving away from the lock hole 121. More specifically, the distance between the inner wall of the outer shell 13 and the outer wall of the lock shell 12 is less than half the width of the locking pin 31. When the locking pin 31 abuts against the inner wall of the outer shell 13, the axis of the locking pin 31 is still located in the guide hole 122. When the lock cylinder 11 drives the locking pin 31 to extend into the inner ring through hole 221 to lock the movable end 22, the lock cylinder 11 acts on the part of the locking pin 31 located outside the guide hole 122, so that the lock cylinder 11 has a tendency to push the locking pin 31 along the guide hole 122 toward the lock hole 121, thereby pushing the locking pin 31 to lock the movable end 22, reducing the possibility that the locking pin 31 may not be able to be pushed into the inner ring through hole 221 to lock the movable end 22 due to excessive extension of the locking pin 31 out of the guide hole 122.

[0049] like Figure 7 and Figure 8As shown, in order to facilitate the sliding of the locking pin 31 by the lock cylinder 11, the lock housing 12 is provided with a movable transmission component 4. The lock cylinder 11 is connected to the transmission component 4. After the movable end 22 is inserted into the lock hole 121, the transmission component 4 pushes the locking pin 31 to slide under the guidance of the lock cylinder 11 and locks the movable end 22 of the chain 2. When unlocking is required, the lock cylinder 11 is unlocked first, so as to drive the transmission component 4 to deviate from the sliding path of the locking pin 31 to unlock the locking pin 31.

[0050] When the transmission component 4 is used to push the locking pin 31 to slide, the transmission component 4 includes a rotating cam 41 and a transmission frame 42. The rotating cam 41 is connected to the lock cylinder 11 and rotates with the lock cylinder 11. The transmission frame 42 is rotatably mounted on the lock housing 12. The transmission frame 42 is located between the rear end of the rotating cam 41 and the locking pin 31. When the lock cylinder 11 is rotated by the key, the rotating cam 41 rotates with the lock cylinder 11. During the rotation process, the rotating cam 41 pushes the transmission frame 42, causing the transmission frame 42 to push the locking pin 31. The pushed locking pin 31 slides along the guide hole 122 to extend into the inner ring through hole 221 and lock the movable end 22.

[0051] like Figure 8 and Figure 9 As shown, the transmission frame 42 includes an abutment portion 421, a transition portion 422, and a pushing portion 423 connected sequentially from front to back. The abutment portion 421 is located at the front end of the transmission frame 42 and interacts with the rotating cam 41. The transition portion 422 is located in the middle of the transmission frame 42 and is rotatably connected to the lock housing 12. The pushing portion 423 is located at the rear end of the transmission frame 42 and interacts with the locking pin 31. The abutment portion 421 tends to interact with the rotating cam 41. When the rotating cam 41 rotates with the lock cylinder 11, the rotating cam 41 abuts against the abutment portion 421. Under the abutment of the rotating cam 41, the abutment portion 421 rotates through the transition portion 422. The pushing portion 423 rotates in the transmission frame 42. The rear end of 2 rotates and pushes the locking pin 31 or moves away from the sliding path of the locking pin 31. Specifically, when it is necessary to lock the movable end 22, the rotating cam 41 acts on the abutment part 421, causing the abutment part 421 to move away from the axis of the rotating cam 41. The pushing part 423 slides toward the locking pin 31 and pushes the locking pin 31, so that the locking pin 31 extends into the inner ring through hole 221 to lock the movable end 22. When unlocking the movable end 22, the lock cylinder 11 drives the rotating cam 41 to reset. The abutment part 421 moves closer to the axis of the rotating cam 41 under its own tendency. The pushing part 423 moves away from the sliding path of the locking pin 31, and then the movable end 22 is pulled to unlock.

[0052] like Figure 9As shown, in order to make the abutment part 421 tend to interact with the rotating cam 41, an elastic member 43 is provided between the abutment part 421 and the lock housing 12. The elastic member 43 abuts the abutment part 421 toward the rotating cam 41, so that the abutment part 421 and the rotating cam 41 interact with each other whether the movable end 22 is unlocked or locked, thereby ensuring the normal use of the chain lock.

[0053] In another embodiment, such as Figure 5-1 , Figure 5-2 and Figure 6 As shown, the locking post 31 can be cylindrical, elliptical, or other irregular shapes. To facilitate the transmission member 4 in pushing the locking post 31 to slide into the lock hole 121, the outer peripheral side of the locking post 31 includes a first guide surface 313 and a second guide surface 314. The first guide surface 313 is located on the outer side away from the lock hole 121 and faces the transmission member 4. The locking post 31 contacts the transmission member 4 through the first guide surface 313, so that the locking post 31 tends to slide along the guide hole 122 toward the lock hole 121 when pushed by the transmission member 4, and the transmission member 4 and the locking post 31 slide relative to each other along the first guide surface 313. Through the guidance of the first guide surface 313, the possibility of the transmission member 4 and the locking post 31 excessively abutting in a direction perpendicular to the sliding direction of the locking post 31, which would prevent the locking post 31 from sliding into the lock hole 121, is reduced, ensuring that the locking post 31 can extend into the inner ring through hole 221 when it is necessary to lock the movable end 22. The second guide surface 314 is located on the inner side facing the lock hole 121 and facing the movable end 22 of the chain 2. When the movable end 22 is unlocked, the movable end 22 of the chain 2 abuts against the second guide surface 314 to push the locking pin 31 out of the lock hole 121. Through the contact of the second guide surface 314, the locking pin 31 has a tendency to slide along the lock hole 121 towards the guide hole 122 when unlocking, and the movable end 22 and the locking pin 31 slide relative to each other along the second guide surface 314. This reduces the excessive contact between the locking pin 31 and the movable end 22 in the direction perpendicular to the sliding direction of the locking pin 31, which would affect the unlocking of the movable end 22. Through the setting of the first guide surface 313 and the second guide surface 314, it is convenient for the transmission member 4 to push the locking pin 31 to lock the movable end 22 and for the movable end 22 to push the locking pin 31 to unlock the movable end 22.

[0054] To reduce the possibility that the locking pin 31 may enter the lock hole 121 without locking the movable end 22, thus affecting the insertion of the movable end 22 into the lock hole 121, such as Figure 5-1 , Figure 5-2 and Figure 6As shown, the locking post 31 is provided with a third guide surface 315. The third guide surface 315 and the second guide surface 314 are symmetrically arranged along the sliding path of the locking post 31. When the chain lock is in the unlocked state, the locking post 31 can slide freely between the sliding rib 32 and the outer shell 13. Due to the swinging or placement method of the chain lock, when the movable end 22 is not inserted into the lock hole 121, the locking post 31 may extend into the lock hole 121. When it is necessary to insert the movable end 22 into the lock hole 121 to lock the item, the movable end 22 is directly inserted into the lock hole 121, or the movable end 22 abuts against the third guide surface 315 on the locking post 31 that extends into the lock hole 121. During the abutting process, the movable end 22 pushes the locking post 31 out of the lock hole 121 to reduce the locking post 31 from entering the lock hole 121. This causes the movable end 22 and the locking post 31 to abut against each other along the insertion direction of the movable end 22, resulting in the movable end 22 not being locked, which in turn affects the normal use of the chain lock.

[0055] In addition to the preferred embodiments described above, the present invention has other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection claimed by the present invention.

Claims

1. A chain lock, comprising a lock body and a chain, the lock body comprising a lock shell and a lock cylinder, the lock shell having a lock hole, the chain comprising a fixed end fixed to the lock shell and a movable end inserted into the lock hole, the lock shell having a locking element, the lock cylinder driving the locking element to lock the movable end in the lock hole, characterized in that, The locking component includes a locking pin, which is slidably disposed on the lock housing and can extend into the inner ring through hole of the movable end to lock the movable end or move out of the inner ring through hole of the movable end to unlock the movable end. The sliding direction of the locking pin is perpendicular to the length direction of the locking pin. The lock cylinder drives the locking pin to slide to extend into the inner ring through hole of the movable end. The locking pin has at least two points abutting against the hole wall of the inner ring through hole of the movable end. The lock housing is provided with a movable transmission component. The transmission component, driven by the lock cylinder, pushes the locking pin to slide and locks the movable end of the chain. The transmission component can deviate from the sliding path of the locking pin to unlock the locking pin. The outer peripheral side of the locking pin includes a first guide surface and a second guide surface. The first guide surface is located on the outer side away from the lock hole and faces the transmission component. The second guide surface is located on the inner side facing the lock hole and faces the movable end of the chain. The transmission component abuts against the first guide surface of the locking pin to push the locking pin into the lock hole. The movable end of the chain abuts against the second guide surface to push the locking pin out of the lock hole.

2. The chain lock according to claim 1, characterized in that, The lock housing is provided with a guide hole that communicates with the lock hole. The guide hole is for the locking pin to be installed and fitted. The guide hole wall and the end face of the locking pin are provided with guide ribs and guide grooves to guide the sliding of the locking pin. The guide ribs are inserted into the guide grooves to simultaneously restrict the rotation of the locking pin.

3. The chain lock according to claim 2, characterized in that, The guide rib has a first blocking surface, and the end face of the guide groove away from the lock hole is a second blocking surface. When the first blocking surface and the second blocking surface come into contact, the locking pin extends into the lock hole to lock the movable end.

4. The chain lock according to claim 2, characterized in that, The lock cylinder and lock shell are covered by an outer shell, which blocks the locking pin when it exits the lock hole to prevent the locking pin from disengaging from the guide hole.

5. The chain lock according to claim 1, characterized in that, The locking pin has a circumferentially extending abutment surface on the surface facing the lock hole. When the locking pin locks the movable end, the abutment surface maintains surface contact with the wall of the inner ring through hole of the movable end.

6. The chain lock according to claim 1, characterized in that, The transmission component includes a rotating cam and a transmission frame. The rotating cam is connected to the lock cylinder and rotates with the lock cylinder. The transmission frame is rotatably mounted on the lock housing. The transmission frame is located between the rear end of the rotating cam and the locking pin. The lock cylinder drives the rotating cam to rotate, thereby pushing the transmission frame so that the transmission frame pushes the locking pin to lock the moving end of the chain. The transmission frame has a tendency to remain in contact with the rotating cam and move away from the locking pin.

7. The chain lock according to claim 6, characterized in that, The transmission frame includes an abutment part, a transition part, and a pushing part connected sequentially from front to back. The abutment part is located at the front end of the transmission frame and interacts with the rotating cam. The transition part is located in the middle of the transmission frame and is rotatably connected to the lock housing. The pushing part is located at the rear end of the transmission frame and interacts with the locking pin.

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