chain lock

Abstract

The present invention provides a chain lock, comprising a lock housing, a lock core seat, a lock core, a fixed plug plate, a linkage, a torsion spring, a swivel seat, a latch seat, a positioning block, a compression spring, a cover plate, two screws and a chain, wherein the lock core assembly is arranged in the lock core seat, the linkage is arranged in the lock core seat, the torsion spring is arranged between the lock core seat and the linkage, the swivel seat is arranged on one side of the lock core seat, the latch seat assembly is arranged on the swivel seat, the positioning block is arranged between the latch seat and the swivel seat, and the compression spring is arranged between the positioning block and the swivel seat The above components are installed in the lock housing, the fixed end of the chain is inserted into the first chain insertion hole and the second insertion hole of the lock housing and the lock core seat, the fixed plug plate is inserted into the first fixed slot of the lock core seat and the second fixed slot of the chain, and the cover plate is covered on one end of the lock housing. Two screws are passed through the second through-hole of the latch seat and the first through-hole of the lock core seat from the other end of the lock housing and are screwed into the screw hole of the cover plate. In this way, the chain can be firmly locked and the chain lock can be easily disassembled.

Description

Technical Field

[0001] The present invention relates to a chain lock, and in particular to a chain lock which can achieve the best anti-theft effect on the locked object and can conveniently disassemble the lock components for classification and recycling. Background Art

[0002] A conventional chain lock is mainly used to lock items to fixed objects to prevent thieves from stealing them at will, for example, locking a bicycle or a stroller to a railing or a pillar. The structure of a conventional chain lock is that two ends of a chain are connected with locks that can be locked together. The lock is a matching lock or a buckle padlock, which can prevent the locked items from being moved and prevent the items from being stolen. However, the lock and chain of conventional chain locks are separately provided, and the lock is easy to lose. In addition, the lock structure of conventional locks is extremely simple, and thieves can easily unlock or break the lock from the outside with tools, so the anti-theft effect is not ideal. There are also chain locks that combine the chain and the lock into one. However, the chain lock cannot be disassembled and repaired after the combination is completed. If the chain lock is damaged, the lock shell must be destroyed with a breaking tool to disassemble the internal components for sorting and recycling, which is less convenient in recycling and disassembly. Summary of the Invention

[0003] The main purpose of the present invention is to provide a chain lock that can effectively solve the shortcomings of conventional chain locks when in use.

[0004] The present invention provides a chain lock, comprising:

[0005] A lock housing, wherein a receiving groove is provided in the lock housing, two first chain insertion holes are provided on the wall surface of the lock housing and are connected to the receiving groove, and a positioning protrusion is provided on the wall surface of the receiving groove of the lock housing;

[0006] A lock core seat is provided in the accommodating groove of the lock shell, one end of the lock core seat is provided with a lock core accommodating groove and a first fixed slot, two second chain insertion holes are provided on the wall surface of the lock core seat, the two second chain insertion holes are connected to the first fixed slot, the other end of the lock core seat is provided with a first groove, the first groove is provided with a first notch, the inner wall surface of the first groove is provided with a first spring insertion hole, a through hole is provided in the lock core seat to connect the first groove and the lock core accommodating groove, and two first through holes are provided on one end of the lock core seat to pass through the other end of the lock core seat;

[0007] A lock core is arranged in the lock core receiving groove of the lock core seat, one end of the lock core is provided with a key insertion hole, and the other end of the lock core is provided with a rotating protrusion;

[0008] A fixed inserting plate is inserted into the first fixed slot of the lock core seat;

[0009] A linkage member is provided in the lock core seat, one end of the linkage member is provided with a protrusion, the outer end surface of the protrusion is provided with a positioning hole, the positioning hole is for the rotating protrusion of the lock core to be inserted into, a limiting protrusion is provided on the peripheral wall surface of the linkage member, the limiting protrusion is provided in the first notch of the lock core seat, a second spring insertion hole is provided on the linkage member, and a linkage protrusion is provided on the other end of the linkage member;

[0010] a torsion spring sleeved on the protruding post of the linkage member and located between the linkage member and the lock core seat, wherein a first end of the torsion spring is inserted into a first spring insertion hole of the lock core seat, and a second end of the torsion spring is inserted into a second spring insertion hole of the linkage member;

[0011] A swivel seat is provided on one side of the lock core seat, the swivel seat is provided with a latch seat receiving groove, a steel ball groove is provided on the wall surface of the latch seat receiving groove, a positioning groove and two latch insertion holes are provided on the inner end surface of the latch seat receiving groove, a connecting hole for receiving the linkage protrusion of the linkage member is provided in the positioning groove, and two second notches are provided on the wall surface of the swivel seat;

[0012] A latch seat is assembled on the rotating seat, the latch seat is provided with an inserting portion, the inserting portion is provided in the latch seat receiving groove of the rotating seat, a positioning convex body is protruded on each side of the inserting portion, and the two positioning convex bodies are respectively provided in the two second notches of the rotating seat, the latch seat is provided with a latch slot, the inserting portion is provided with a steel ball receiving groove that passes through the latch slot, and two locking steel balls are oppositely provided in the steel ball receiving groove, and a positioning groove is provided on the outer wall surface of the latch seat, and the positioning groove is for the positioning convex body of the lock shell to be embedded, and the outer end surface of the inserting portion is protruded with two positioning protrusions and a through hole, and the two positioning protrusions are each provided with a second through hole that passes through the latch slot, and the through hole is provided with two notches;

[0013] A positioning block is disposed in the through hole of the latch seat, the positioning block is provided with a spring receiving groove, and two latch protrusions are protruded from the outer wall of the positioning block, the two latch protrusions corresponding to the two latch insertion holes of the rotating seat and the two notches of the latch seat;

[0014] A compression spring is disposed in the spring receiving groove of the positioning block and is held in the positioning groove of the rotating seat;

[0015] a cover plate disposed at one end of the lock housing, the cover plate being provided with a key hole and two screw holes;

[0016] Two screws are inserted through the second through-hole of the latch seat and the first through-hole of the lock core seat, and are screwed into the screw holes of the cover plate;

[0017] A chain, one end of which is set as a fixed end and the other end is set as a movable end. The fixed end is inserted into the two first chain insertion holes of the lock shell and the two second chain insertion holes of the lock core seat. The opposite inner side surfaces of the fixed end are each provided with a second fixed slot. A fixed plug plate is provided in the lock core seat and inserted into the two second fixed slots of the fixed end to fix the fixed end of the chain. The movable end of the chain is inserted into the latch slot of the latch seat for the lock steel ball to latch the lock.

[0018] The advantages of the chain lock of the present invention are that one end of the chain is connected to the lock housing, so there is no risk of loss, and the entire fixing structure is hidden inside the lock housing and cannot be damaged. It cannot be unlocked without the correct key, which has excellent anti-theft effect. The chain lock can also be easily disassembled and repaired. If the chain lock is damaged and needs to be discarded, the internal components can also be easily disassembled for classified recycling, which is very environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Shown is a perspective exploded view of an embodiment of the present invention.

[0020] Figure 2 Shown is a three-dimensional exploded view from another angle of an embodiment of the present invention.

[0021] Figure 3 Shown is a three-dimensional combination diagram of an embodiment of the present invention.

[0022] Figure 4 Shown is a combined cross-sectional view of an embodiment of the present invention.

[0023] Figure 5 Shown is a cross-sectional schematic diagram of an embodiment of the present invention in which the fixed end of the chain is fixed in the lock housing.

[0024] Figure 6 Shown is a schematic diagram of locking according to an embodiment of the present invention.

[0025] Figure 7 FIG2 is a cross-sectional view from another angle of the embodiment of the present invention when locked.

[0026] Figure 8 Shown is a cross-sectional schematic diagram of an embodiment of the present invention when locked.

[0027] Figure 9 Shown is a schematic diagram of unlocking according to an embodiment of the present invention.

[0028] Figure 10 Shown is a schematic cross-sectional view of an embodiment of the present invention when unlocked.

[0029] Figure 11 FIG2 is a schematic diagram of a lock to be disassembled according to an embodiment of the present invention.

[0030] Explanation of the reference numerals: 1-lock housing; 10-accommodating groove; 11-first chain insertion hole; 12-positioning protrusion; 2-lock core seat; 20-lock core receiving groove; 21-first fixing slot; 22-second chain insertion hole; 23-first groove; 24-first notch; 25-first spring insertion hole; 26-through hole; 27-first through hole; 3-lock core; 30-key insertion hole; 31-rotating protrusion; 32-fixing plug plate; 4-linking member; 40-boss; 41-positioning insertion hole; 42-limiting protrusion; 43-second spring insertion hole; 44-linking protrusion; 45-torsion spring; 450-first end; 451-second end; 5-rotating seat; 50-clamping seat Receiving groove; 51- steel ball groove; 52- positioning groove; 53- latch socket; 54- connecting socket; 55- second notch; 6- latch seat; 60- plug-in part; 61- positioning protrusion; 62- latch slot; 63- steel ball receiving groove; 64- locking steel ball; 65- positioning notch; 66- positioning protrusion; 660- second through hole; 67- through hole; 670- notch; 7- positioning block; 70- spring receiving groove; 71- latch protrusion; 72- compression spring; 8- cover plate; 80- key through hole; 81- screw hole; 82- screw; 9- chain; 90- fixed end; 900- second fixed slot; 91- movable end; A- key; B- tool. DETAILED DESCRIPTION

[0031] Regarding the technical means adopted by the present invention to achieve the above-mentioned purpose and effect, the preferred feasible embodiments are now listed and shown in detail with reference to the accompanying drawings as follows:

[0032] See also Figure 1 、 Figure 2As shown, the present invention provides a chain lock, which mainly includes: a lock shell 1, a receiving groove 10 is provided in the lock shell 1, and two first chain insertion holes 11 connected to the receiving groove 10 are provided on the wall surface of the lock shell 1, and a positioning protrusion 12 is relatively convexly provided on the wall surface of the receiving groove 10 of the lock shell 1; a lock core seat 2 is provided in the receiving groove 10 of the lock shell 1, and one end of the lock core seat 2 is provided with a lock core receiving groove 20 and a first fixed slot 21, and two second chain insertion holes 22 are provided on the wall surface of the lock core seat 2, and the two second chain insertion holes 22 are connected to the first fixed slot 21, and the other end of the lock core seat 2 is provided with a There is a first groove 23, a first notch 24 is provided on the first groove 23, a first spring insertion hole 25 is provided on the inner wall surface of the first groove 23, a through hole 26 is provided in the lock core seat 2 to communicate with the first groove 23 and the lock core groove 20, and two first through holes 27 are provided on one end of the lock core seat 2 to pass through the other end of the lock core seat 2; a lock core 3 is provided in the lock core groove 20 of the lock core seat 2, a key insertion hole 30 is provided at one end of the lock core 3, and a rotating protrusion 31 is convexly provided at the other end of the lock core 3; a fixed insert plate 32 is inserted into the first fixed slot 21 of the lock core seat 2; a The linking member 4 is arranged in the lock core seat 2, and a boss 40 is provided at one end of the linking member 4. A positioning socket 41 is provided on the outer end surface of the boss 40. The positioning socket 41 is for the rotating convex body 31 of the lock core 3 to be inserted. A limiting convex body 42 is convexly provided on the peripheral wall surface of the linking member 4. The limiting convex body 42 is arranged in the first notch 24 of the lock core seat 2. A second spring socket 43 is provided on the linking member 4, and a linking convex body 44 is convexly provided at the other end of the linking member 4; a torsion spring 45 is sleeved on the boss 40 of the linking member 4 and is located between the linking member 4 and the lock core seat 2. The torsion spring The first end 450 of the torsion spring 45 is inserted into the first spring insertion hole 25 of the lock core seat 2, and the second end 451 of the torsion spring 45 is inserted into the second spring insertion hole 43 of the linkage member 4; a rotating seat 5 is provided on one side of the lock core seat 2, and the rotating seat 5 is provided with a latch seat groove 50, and a steel ball groove 51 is provided on the wall surface of the latch seat groove 50. A positioning groove 52 and two latch insertion holes 53 are provided on the inner end surface of the latch seat groove 50. A connecting hole 54 for the linkage protrusion 44 of the linkage member 4 to be installed is provided in the positioning groove 52. Two second notches 55 are provided on the wall surface of the rotating seat 5;A latch seat 6 is assembled on the rotating seat 5, and the latch seat 6 is provided with a plug-in portion 60, which is provided in the latch seat receiving groove 50 of the rotating seat 5. A positioning convex body 61 is provided on each side of the plug-in portion 60. The two positioning convex bodies 61 are respectively provided in the two second notches 55 of the rotating seat 5. The latch seat 6 is provided with a latch slot 62, and a steel ball receiving groove 63 is provided on the plug-in portion 60, which passes through the latch slot 62. Two locking steel balls 64 are relatively provided in the steel ball receiving groove 63. The latch seat 6 is provided with a plurality of locking balls 64. The outer wall is provided with two opposite positioning grooves 65, the positioning groove 65 is for the positioning convex body 12 of the lock housing 1 to be set in, the outer end surface of the plug-in portion 60 is provided with two positioning protrusions 66 and a through hole 67, the two positioning protrusions 66 are each provided with a second through hole 660 that passes through the latch slot 62, and the through hole 67 is provided with two notches 670; a positioning block 7 is provided in the through hole 67 of the latch seat 6, the positioning block 7 is provided with a spring receiving groove 70, the outer wall surface of the positioning block 7 is provided with two latch protrusions 7 1, the two latch protrusions 71 correspond to the two latch insertion holes 53 of the swivel seat 5 and the two notches 670 of the latch seat 6; a compression spring 72 is provided in the spring receiving groove 70 of the positioning block 7 and abuts against the positioning groove 52 of the swivel seat 5; a cover plate 8 is provided on the lock housing 1, and the cover plate 8 is provided with a key through hole 80 and two screw holes 81; two screws 82 are provided through the second through hole 660 of the latch seat 6 and the first through hole 27 of the lock core seat 2, and are screwed into the screw holes 81 of the cover plate 8 A chain 9 has one end configured as a fixed end 90 and the other end as a movable end 91. The fixed end 90 is inserted into the two first chain insertion holes 11 of the lock housing 1 and the two second chain insertion holes 22 of the lock core seat 2. Opposite inner sides of the fixed end 90 are each provided with a second fixed slot 900. A fixed insert plate 32 disposed within the lock core seat 2 is inserted into the two second fixed slots 900. The movable end 91 of the chain 9 is inserted into the latch slot 62 of the latch seat 6. Thus, a chain lock structure is formed.

[0033] When assembling the present invention, please refer to Figures 1 to 5As shown, the compression spring 72 is set in the spring receiving groove 70 of the positioning block 7, the positioning block 7 is set in the through hole 67 of the latch seat 6, the two latch protrusions 71 of the positioning block 7 are respectively set in the two notches 670 of the latch seat 6, and the two locking steel balls 64 are set in the steel ball receiving groove 63 of the latch seat 6, and then the plug-in portion 60 of the latch seat 6, the positioning block 7 and the compression spring 72 are assembled together in the latch seat receiving groove 50 of the rotating seat 5, so that the outer end of the compression spring 72 is against the positioning groove 52 of the rotating seat 5, and the latch The two positioning protrusions 61 of the catch seat 6 are respectively arranged in the two second notches 55 of the rotating seat 5, and the two locking steel balls 64 correspond to the two steel ball grooves 51 of the rotating seat 5. In addition, the lock core 3 is arranged in the lock core groove 20 of the lock core seat 2, and the torsion spring 45 is sleeved on the protrusion 40 of the linking member 4, so that the second end 451 of the torsion spring 45 is embedded in the second spring insertion hole 43 of the linking member 4, and then the linking member 4 and the torsion spring 45 are arranged in the through hole 26 and the first groove 23 of the lock core seat 2, and the torsion spring 4 The first end 450 of the 5 is embedded in the first spring insertion hole 25 of the lock core seat 2, so that the torsion spring 45 is in an elastically tightened state, and the rotating protrusion 31 of the lock core 3 is inserted into the positioning insertion hole 41 at the end of the linking member 4, and the limiting protrusion 42 of the linking member 4 is set in the first notch 24 of the lock core seat 2, and then the swivel seat 5 is assembled on one side of the lock core seat 2, so that the linkage protrusion 44 of the linking member 4 is inserted into the connecting hole 54 of the swivel seat 5, and then the above-mentioned assembled components are placed together in the accommodating groove 10 of the lock case 1 In the lock case, the two positioning protrusions 12 of the lock case 1 are respectively embedded in the two positioning grooves 65 of the latch seat 6, the latch seat 6 is positioned in the lock case 1, and the two second chain insertion holes 22 of the lock core seat 2 are respectively aligned with the two first chain insertion holes 11 of the lock case 1, and then the fixed end 90 of the chain 9 is inserted into the first chain insertion hole 11 of the lock case 1 and the second chain insertion hole 22 of the lock core seat 2, and the fixed plug plate 32 is inserted into the first fixed slot 21 of the lock core seat 2 and the two second fixed slots 900 of the chain 9 (as shown in FIG. Figure 5 As shown), fix the fixed end 90 of the chain 9 to the lock housing 1, and finally cover the cover 8 on one end of the lock housing 1. Pass the two screws 82 from the other end of the lock housing 1 through the two second through-holes 660 in the latch slot 62 of the latch seat 6 and the two first through-holes 27 of the lock core seat 2 and screw them into the two screw holes 81 of the cover 8. Fix each component in the lock housing 1. In this way, the overall assembly can be completed.

[0034] When using the lock, please refer to Figures 6 to 8As shown, the movable end 91 of the chain 9 of the present invention is passed through the object to be locked, such as the frame or wheel of a bicycle and the fixed column or fixed frame, and then the movable end 91 of the chain 9 is inserted into the latch slot 62 of the latch seat 6 from the end of the lock housing 1. The movable end 91 of the chain 9 pushes the positioning block 7 to move toward the rotating seat 5 and squeezes the compression spring 72 to an elastically compressed state, and the two latch protrusions 71 of the positioning block 7 are separated from the two notches 670 of the latch seat 6 and are respectively inserted into the two latch insertion holes 53 of the rotating seat 5 (as shown in FIG. Figure 7 As shown), the swivel seat 5 and the latch seat 6 are no longer locked to each other by the two latch protrusions 71 of the positioning block 7, so that the swivel seat 5 can rotate. The swivel seat 5 is elastically restored by the torsion spring 45 and drives the linkage 4 to rotate. The linkage 4 also drives the swivel seat 5 to rotate, and the steel ball groove 51 of the swivel seat 5 is separated from the steel ball receiving groove 63 position of the corresponding latch seat 6 (as shown). Figure 8 As shown), the positioning block 7 and its two latching protrusions 71 also rotate with the rotating base 5 to disengage from the corresponding positions of the notch 670 of the latching base 6. The inner wall surface of the rotating base 5 pushes the two locking steel balls 64 inward and is locked in the movable end 91 of the chain 9, and the movable end 91 of the chain 9 is locked and positioned in the lock housing 1. In this way, the locking action can be completed.

[0035] When the present invention is unlocked, please refer to Figure 9 、 Figure 10 As shown, it is only necessary to insert the key A into the key through-hole 80 of the cover plate 8 and the key insertion hole 30 of the lock core 3 to unlock the lock core 3, and then the lock core 3 can be rotated. The rotating protrusion 31 of the lock core 3 drives the linking member 4 to rotate, and twists the torsion spring 45 into an elastic twisting state. The linkage protrusion 44 of the linkage member 4 also drives the swivel seat 5 to rotate, so that the steel ball groove 51 of the swivel seat 5 returns to the position corresponding to the steel ball receiving groove 63 of the latch seat 6. The lock steel ball 64 can then move outward into the steel ball groove 51 of the swivel seat 5 and no longer get caught in the movable end 91 of the chain 9. The movable end 91 of the chain 9 can be pulled out from the latch slot 62 of the latch seat 6, so that the unlocking action is completed. The present invention is very convenient to use and can be used to fix the lock of any object. The screw 82 used to fix the overall structure of the present invention is hidden inside the lock case 1. The thief cannot disassemble the chain lock of the present invention from the outside, so the anti-theft effect is excellent.

[0036] If the internal components of the present invention are damaged and need to be repaired or the lock is not used and needs to be discarded for recycling, please refer to Figure 11 As shown, it is only necessary to unfasten the chain lock and remove the movable end 91 of the chain 9 from the latch slot 62 of the latch seat 6. Then, the tool B can be inserted into the latch slot 62 to disassemble the screw 82. The screw 82 locked on the cover plate 8 can be removed, and the various components can be disassembled and classified from the lock housing 1. There is no need to use destructive tools to damage the lock housing 1. It is very convenient and quick to disassemble and repair the internal components or to classify and recycle the various components.

[0037] The above description is only illustrative of the present invention and not restrictive. Those skilled in the art will understand that many modifications, changes or equivalents may be made without departing from the spirit and scope defined by the claims, and all of them will fall within the scope of protection of the present invention.

Claims

1. A chain lock, characterized in that: Includes: A lock housing, wherein a receiving groove is provided in the lock housing, two first chain insertion holes are provided on the wall surface of the lock housing and are connected to the receiving groove, and a positioning protrusion is provided on the wall surface of the receiving groove of the lock housing; A lock core seat is provided in the accommodating groove of the lock shell, one end of the lock core seat is provided with a lock core accommodating groove and a first fixed slot, two second chain insertion holes are provided on the wall surface of the lock core seat, the two second chain insertion holes are connected to the first fixed slot, the other end of the lock core seat is provided with a first groove, the first groove is provided with a first notch, the inner wall surface of the first groove is provided with a first spring insertion hole, a through hole is provided in the lock core seat to connect the first groove and the lock core accommodating groove, and two first through holes are provided on one end of the lock core seat to pass through the other end of the lock core seat; A lock core is arranged in the lock core receiving groove of the lock core seat, one end of the lock core is provided with a key insertion hole, and the other end of the lock core is provided with a rotating protrusion; A fixed inserting plate is inserted into the first fixed slot of the lock core seat; A linkage member is provided in the lock core seat, one end of the linkage member is provided with a protrusion, the outer end surface of the protrusion is provided with a positioning hole, the positioning hole is for the rotating protrusion of the lock core to be inserted into, a limiting protrusion is provided on the peripheral wall surface of the linkage member, the limiting protrusion is provided in the first notch of the lock core seat, a second spring insertion hole is provided on the linkage member, and a linkage protrusion is provided on the other end of the linkage member; a torsion spring sleeved on the protruding post of the linkage member and located between the linkage member and the lock core seat, wherein a first end of the torsion spring is inserted into a first spring insertion hole of the lock core seat, and a second end of the torsion spring is inserted into a second spring insertion hole of the linkage member; A swivel seat is provided on one side of the lock core seat, the swivel seat is provided with a latch seat receiving groove, a steel ball groove is provided on the wall surface of the latch seat receiving groove, a positioning groove and two latch insertion holes are provided on the inner end surface of the latch seat receiving groove, a connecting hole for receiving the linkage protrusion of the linkage member is provided in the positioning groove, and two second notches are provided on the wall surface of the swivel seat; A latch seat is assembled on the rotating seat, the latch seat is provided with an inserting portion, the inserting portion is provided in the latch seat receiving groove of the rotating seat, a positioning convex body is protruded on each side of the inserting portion, and the two positioning convex bodies are respectively provided in the two second notches of the rotating seat, the latch seat is provided with a latch slot, the inserting portion is provided with a steel ball receiving groove that passes through the latch slot, and two locking steel balls are oppositely arranged in the steel ball receiving groove, and a positioning groove is provided on the outer wall surface of the latch seat, and the positioning groove is for the positioning convex body of the lock shell to be embedded, and the outer end surface of the inserting portion is protruded with two positioning protrusions and a through hole, and the two positioning protrusions are each provided with a second through hole that passes through the latch slot, and the through hole is provided with two notches; a positioning block disposed in the through hole of the latch seat, the positioning block having a spring receiving groove and two latch protrusions protruding from the outer wall of the positioning block, the two latch protrusions corresponding to the two latch insertion holes of the rotating seat and the two notches of the latch seat; A compression spring is disposed in the spring receiving groove of the positioning block and is held in the positioning groove of the rotating seat; a cover plate disposed at one end of the lock housing, the cover plate being provided with a key hole and two screw holes; Two screws are inserted through the second through-hole of the latch seat and the first through-hole of the lock core seat, and are screwed into the screw holes of the cover plate; A chain, one end of which is set as a fixed end and the other end is set as a movable end. The fixed end is inserted into the two first chain insertion holes of the lock shell and the two second chain insertion holes of the lock core seat. The opposite inner side surfaces of the fixed end are each provided with a second fixed slot. A fixed plug plate is provided in the lock core seat and inserted into the two second fixed slots of the fixed end to fix the fixed end of the chain. The movable end of the chain is inserted into the latch slot of the latch seat for the lock steel ball to latch the lock.

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