CN220036390U - Coordinated control structure of anti-prying lock - Google Patents

Abstract

The utility model discloses a coordinated control structure of an anti-prying lock, which comprises a shell, wherein a lock shell is fixedly arranged in the shell, a plurality of marble springs are fixedly arranged in the lock shell, flat marble is fixedly arranged at the top end of each marble spring, round marble is movably arranged at the top end of each flat marble, a lock cylinder is movably arranged in the lock shell, a key slot is formed in the lock cylinder, a poking wheel is movably arranged in the lock cylinder, a rotating wheel is movably arranged in the poking wheel, four limit springs are fixedly arranged at two sides of the rotating wheel, clamping grooves are formed in the top of the rotating wheel, and a triggering block is fixedly arranged at one side of the rotating wheel. Through the extension spring that sets up, movable rod and gag lever post, the pulling force of extension spring makes the one end of movable rod be less than the other end all the time, and the position of fixed gag lever post that can be better makes its axostylus axostyle can not withdraw, even lawless persons uses the instrument to push-and-pull spring bolt from the crack also can not make the axostylus axostyle inwards remove, has strengthened the pick-proof, the theftproof performance of tool to lock, has improved the security of tool to lock.

Description

Coordinated control structure of anti-prying lock

Technical Field

The utility model belongs to the technical field of anti-theft locks, and particularly relates to a linkage control structure of an anti-prying lock.

Background

Door locks, as the name suggests, are devices used to lock a door to prevent others from opening the door, and are an indispensable tool in people's ordinary lives. The door locks are classified into a plurality of types, and the door locks are required to be different in various occasions, so that the common household antitheft door locks are high in safety and low in price.

The door lock has very close relation in human life, relates to the safety of each family and public place, when a general lock is unlocked, a dial wheel in a lock cylinder is directly pushed by a key, so that the lock drives a lock tongue to move, unlocking and locking are realized, the structure capable of directly pushing the lock tongue is poor in anti-prying and anti-theft performances, and based on the structure, the linkage control structure of the anti-prying lock is provided.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model aims to provide a coordinated control structure of an anti-prying lock, which solves the problems of poor anti-prying and anti-theft performances of the existing lockset.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides a coordinated control structure of anti-pick lock, includes the casing, the inside fixed mounting of casing has the lock shell, the inside fixed mounting of lock shell has a plurality of marble springs, the top fixed mounting of marble spring has the flat marble, the top movable mounting of flat marble has the button marble, the inside movable mounting of lock shell has the lock core, the inside of lock core has seted up the key slot, the inside movable mounting of lock core has the thumb wheel, the inside movable mounting of thumb wheel has the runner, the both sides fixed mounting of runner has four spacing springs, the draw-in groove has been seted up at the top of runner, one side fixed mounting of runner has the trigger block, the top of thumb wheel has the slotted hole, the top fixed mounting of slotted hole has the telescopic link, the outside movable sleeve of telescopic link has first spring, the bottom fixed mounting of telescopic link has the groove block, one side of thumb wheel is close to the thumb wheel has the clamp splice, the one end fixed mounting of clamp splice bar has the trigger lever, the fixed block has two fixed shaft blocks, two fixed mounting of the inside fixed axle boxes have the fixed axle box, two fixed mounting of fixed axle boxes have the fixed axle boxes, fixed mounting of fixed axle boxes have the inner chamber, fixed mounting of fixed mounting has the fixed axle boxes, the top surface fixed mounting of fixed plate has two pressure springs, the top fixed mounting of two pressure springs has the regulation box, the bottom surface fixed mounting of regulation box inner chamber has four regulating blocks, the opposite face of two lock boxes articulates there are two bolts, the outside of lock box articulates there is the gangbar, one side fixed mounting of casing inner chamber has the second pivot, the outside movable mounting of second pivot has the movable rod, the bottom fixed mounting of movable rod has the connecting block, one side fixed mounting of casing inner chamber has first pivot, the outside movable mounting of first pivot has the gag lever post, one side fixed mounting of casing inner chamber has the dead lever, the top surface fixed mounting of dead lever has the extension spring.

Preferably, one ends of the four limit springs far away from the rotating wheel are tightly attached to the inner side of the shifting wheel, one ends of the first springs are fixedly arranged at the top ends of the slotted holes, the other ends of the first springs are fixedly arranged on the top surfaces of the slotted blocks, and the bottom surfaces of the slotted blocks are tightly attached to the top of the rotating wheel.

Through adopting above-mentioned technical scheme, the advantage lies in the position that can fix the runner through four spacing springs, makes the trough block can not be because the normal device that triggers when opening the door with the key, has increased the stability of device.

Preferably, one end of the triggering rod far away from the clamping block movably penetrates through the groove and extends to the inside of the shifting wheel, and the bottom surface of the clamping block is tightly attached to the top surface of the movable rod.

Through adopting above-mentioned technical scheme, advantage lies in making the movable rod lift up through the trigger lever when the door lock is prized and driving gag lever post chucking fixed block and making its spring bolt can not remove to reach the purpose of pick-proof, increased the security of device.

Preferably, one end of the second rotating shaft far away from the shell movably penetrates through the center point of the movable rod, and one end of the tension spring far away from the fixed rod is fixedly arranged in the connecting block.

Through adopting above-mentioned technical scheme, the advantage lies in that the pulling force through the extension spring uses the second pivot to keep away from the one end downwardly pulling of fixture block with the movable rod, makes its device can not become flexible easily after being triggered, has increased the security of device, and the practical function is good.

Preferably, one end of the limiting rod is hinged to one end of the side face of the movable rod, the limiting rod takes the first rotating shaft as a center point to form an included angle inwards, and the included angle is 120 degrees.

Through adopting above-mentioned technical scheme, advantage lies in making the effect of gag lever post one end and fixed block joint better when the lock is prized, reduces the risk of being prized.

Preferably, one end of the linkage rod movably penetrates through the inner side of the stop block and extends to the top of the stop block, the other end of the linkage rod is bent upwards by taking a hinge point of the linkage rod and the lock box as a center to form an included angle, and the degree of the included angle is 60 degrees.

Through adopting above-mentioned technical scheme, advantage lies in that when normally unblanking, stir the contained angle of gangbar one end through the thumb wheel and drive the other end of gangbar and make the stopper remove and withdraw the spring bolt and accomplish the unblanking, convenient to use.

Preferably, one end of the shaft rod far away from the fixed block penetrates through one sides of the two limiting blocks and extends to one side of the lock tongue, the second spring is sleeved on the outer side of the shaft rod, and one end of the second spring far away from the abutting block is clung to one side of the limiting block.

Through adopting above-mentioned technical scheme, the advantage lies in that can drive the axostylus axostyle through the elasticity of second spring and make the spring bolt can not rock in fixed position, increases the security of device.

Compared with the prior art, the utility model has the beneficial effects that:

1. through the key slot that sets up, when normally unblanking with the key, insert the key in the key slot and drive movable lever extrusion spring through the button head marble and make its marble spring at same horizon, the inserted end of key is with the one end of runner push into the thumb wheel then rotatory key makes lock core and thumb wheel rotate together and unblank, when illegal molecule prizes, because of need push into the thumb wheel with the one end of runner and just can rotate the thumb wheel and unblank, the length of key is fixed, and the tool of prizing lock is when the length of runner one end push into the thumb wheel exceeds the key, first spring can drive the telescopic link through elasticity promotion cell block and get into the position lock dead of draw-in groove with the runner, make it can not drive the thumb wheel rotation and stir the regulating box and make the bolt remove, the one end that the trigger block can press the trigger lever lifts up, then the one end of movable lever just can loosen, at this moment, the second pivot becomes a fulcrum, the pulling force of extension spring can drive the movable lever other end to the position of dead lever, use first pivot as the fulcrum to make one side of the other end of the first pivot chucking piece of pivot through the pin joint of gag lever, the lock tool, the lock is fixed, the lock is moved into the position of the dead lever, the lock is not good, the safety of lock has been increased, the lock has been improved.

2. Through the extension spring that sets up, movable rod and gag lever post, the pulling force of extension spring makes the one end of movable rod be less than the other end all the time, and the position of fixed gag lever post that can be better makes its axostylus axostyle can not withdraw, even lawless persons uses the instrument to push-and-pull spring bolt from the crack also can not make the axostylus axostyle inwards remove, has strengthened the pick-proof, the theftproof performance of tool to lock, has improved the security of tool to lock.

Drawings

FIG. 1 is a schematic cross-sectional elevation view of the present utility model;

FIG. 2 is a schematic side cross-sectional view of the present utility model;

FIG. 3 is an enlarged schematic view of the structure of FIG. 2A according to the present utility model;

FIG. 4 is a schematic view of a rear cross-sectional structure of the present utility model;

fig. 5 is a schematic diagram of the structure of fig. 4B according to the present utility model.

In the figure: 1. a housing; 2. a plug pin; 3. a shaft lever; 4. a bolt; 5. a linkage rod; 6. a limiting block; 7. a second spring; 8. abutting blocks; 9. a fixed block; 10. a lock core; 11. a thumb wheel; 12. an adjustment box; 13. a fixed shaft; 14. an adjusting block; 15. a pressure spring; 16. a fixing plate; 17. a lock box; 18. a key slot; 19. round-head marble; 20. a movable rod; 21. a lock case; 22. a groove; 23. a fixed rod; 24. flat marble; 25. a spring; 26. a rotating wheel; 27. a limit spring; 28. a tension spring; 29. a clamping groove; 30. a slot hole; 31. a telescopic rod; 32. a first spring; 33. a trigger lever; 34. a clamping block; 35. clamping blocks; 36. a limit rod; 37. a first rotating shaft; 38. a connecting block; 39. a second rotating shaft; 40. a trigger block; 41. a trough block; 42. a stop block; 43. and a sliding groove.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by one of ordinary skill in the art without undue burden on the person of ordinary skill in the art based on the embodiments of the present utility model, are within the scope of the present utility model.

As shown in fig. 1 to 5, a coordinated control structure of an anti-pick lock comprises a shell 1, wherein a lock shell 21 is fixedly installed in the shell 1, a plurality of marble springs 25 are fixedly installed in the lock shell 21, flat marble 24 is fixedly installed at the top end of each marble spring 25, round marble 19 is movably installed at the top end of each flat marble 24, a lock cylinder 10 is movably installed in the lock shell 21, a key slot 18 is formed in the lock cylinder 10, a deflector wheel 11 is movably installed in the lock cylinder 10, a rotating wheel 26 is movably installed in the deflector wheel 11, four limit springs 27 are fixedly installed on two sides of the rotating wheel 26, a clamping groove 29 is formed in the top of the rotating wheel 26, a trigger block 40 is fixedly installed on one side of the rotating wheel 26, a slotted hole 30 is formed in the top end of each deflector wheel 11, a telescopic rod 31 is fixedly installed at the top end of each slotted hole 30, a first spring 32 is movably sleeved on the outer side of each telescopic rod 31, the bottom end of the telescopic rod 31 is fixedly provided with a groove block 41, one side of the thumb wheel 11 is provided with a groove 22, one side of the lock shell 21, which is close to the thumb wheel 11, is fixedly provided with a clamping block 35, one end of the clamping block 35 is fixedly provided with a triggering rod 33, one end of the triggering rod 33 is fixedly provided with a clamping block 34, one side of the inner cavity of the shell 1 is fixedly provided with two limiting blocks 6, the opposite sides of the two limiting blocks 6 are fixedly provided with a stop block 42, one side of the inner cavity of the shell 1 is fixedly provided with a supporting block 8, the inside of the supporting block 8 is movably provided with a shaft lever 3, one side of the supporting block 8 is fixedly provided with a second spring 7, one end of the shaft lever 3 is fixedly provided with a fixed block 9, one end of the shaft lever 3, which is far away from the fixed block 9, is fixedly provided with a lock tongue 4, one side of the inner cavity of the shell 1 is fixedly provided with a fixed shaft 13, the outer side of the fixed shaft 13 is movably provided with a lock box 17, the inner side of the lock box 17 is provided with a chute 43, the inside fixed mounting of lock box 17 has fixed plate 16, the top surface fixed mounting of fixed plate 16 has two pressure springs 15, the top fixed mounting of two pressure springs 15 has regulation box 12, the bottom surface fixed mounting of regulation box 12 inner chamber has four regulating blocks 14, two bolt 2 are articulated to the opposite face of two lock boxes 17, the outside of lock box 17 articulates there is gangbar 5, one side fixed mounting of casing 1 inner chamber has second pivot 39, the outside movable mounting of second pivot 39 has movable rod 20, the bottom fixed mounting of movable rod 20 has connecting block 38, one side fixed mounting of casing 1 inner chamber has first pivot 37, the outside movable mounting of first pivot 37 has spacing bar 36, one side fixed mounting of casing 1 inner chamber has dead lever 23, the top surface fixed mounting of dead lever 23 has extension spring 28.

The working principle of the technical scheme is as follows:

when a key is used for unlocking normally, the key is inserted into the key slot 18, the round head marble 19 drives the movable rod 26 to squeeze the marble spring 25, so that the marble spring 25 is on the same horizontal line, the inserted end of the key pushes one end of the rotary wheel 26 into the thumb wheel 11, then the key is rotated, the lock cylinder 10 and the thumb wheel 11 rotate together to unlock, when an illegal person performs unlocking, the thumb wheel 11 can be rotated to unlock the lock because one end of the rotary wheel 26 needs to be pushed into the thumb wheel 11, the length of the key is fixed, when the length of the key is higher than the length of the thumb wheel 11 by the unlocking tool, the first spring 32 pushes the groove block 41 to drive the telescopic rod 31 to enter the clamping groove 29 to lock the position of the rotary wheel 26, so that the thumb wheel 11 cannot be driven to rotate to stir the regulating box 12 to move the bolt 2, meanwhile, the triggering block 40 presses one end of the triggering rod 33 to lift the clamping block 34, then one end of the movable rod 20 is released, at the moment, the second rotating shaft 39 becomes a fulcrum, the pulling force of the 28 can drive the other end of the movable rod 20 to rotate towards the position of the fixed rod 23, the position of the rotating rod 20 is fixed, the first rotating rod 37 is pulled by the elasticity force of the second rotating shaft 39, the first rotating shaft 37 is not to be a fulcrum 37, the first rotating rod is well, and the lock tongue is prevented from being firmly fixed, and the other end is firmly fixed, and the lock dog device is prevented from being pulled by the position of the rotating rod is by the rotating rod, and the rotating rod is firmly, and the rotating rod is 9.

In another embodiment, as shown in fig. 1-5, one end of the four limiting springs 27 far away from the rotating wheel 26 is clung to the inner side of the shifting wheel 11, one end of the first spring 32 is fixedly installed at the top end of the slot hole 30, the other end of the first spring 32 is fixedly installed at the top surface of the slot block 41, and the bottom surface of the slot block 41 is clung to the top of the rotating wheel 26.

The position of the rotating wheel 26 can be fixed through the four limit springs 27, so that the groove block 41 can not trigger the device when the door is opened by a normal key, and the stability of the device is improved.

In another embodiment, as shown in fig. 1-5, an end of the trigger lever 33 away from the latch 34 extends through the recess 22 and into the thumbwheel 11, and the bottom surface of the latch 34 abuts against the top surface of the movable lever 20.

When the door lock is prized, the movable rod 20 is lifted by the trigger rod 33 to drive the limit rod 36 to clamp the fixed block 9 so that the lock tongue 4 cannot move, thereby achieving the anti-prizing purpose and increasing the safety of the device.

In another embodiment, as shown in fig. 1 to 5, the end of the second rotating shaft 39 away from the housing 1 is movably penetrated through the center point of the movable rod 20, and the end of the tension spring 28 away from the fixed rod 23 is fixedly installed inside the connecting block 38.

The tension of the tension spring 28 takes the second rotating shaft 39 as a fulcrum to pull down one end of the movable rod 20 away from the clamping block 34, so that the device cannot be easily loosened after being triggered, the safety of the device is improved, and the practical effect is good.

In another embodiment, as shown in fig. 1-5, one end of the stop lever 36 is hinged to one end of the side of the movable lever 20, and the stop lever 36 is angled inward about the first pivot 37 by an angle of 120 °.

The effect of making the one end of gag lever post 36 and fixed block 9 joint better when the door lock is prized is convenient, reduces the risk of prizing.

In another embodiment, as shown in fig. 1-5, one end of the linkage rod 5 movably penetrates the inner side of the stopper 42 and extends to the top of the stopper 42, and the other end of the linkage rod 5 is bent upward with the hinge point with the lock case 17 as the center to form an included angle with the hinge point of 60 degrees.

When the lock is normally unlocked, the dial wheel 11 is used for poking the included angle at one end of the linkage rod 5 to drive the other end of the linkage rod 5 to enable the limiting block 6 to move, so that the lock tongue 4 is retracted to complete unlocking, and the lock is convenient to use.

In another embodiment, as shown in fig. 1-5, one end of the shaft 3 away from the fixed block 9 penetrates through one side of the two limiting blocks 6 and extends to one side of the lock tongue 4, the second spring 7 is sleeved on the outer side of the shaft 3, and one end of the second spring 7 away from the abutting block 8 is tightly attached to one side of the limiting blocks 6.

The elastic force of the second spring 7 can drive the shaft lever 3 to ensure that the lock tongue 4 cannot shake at a fixed position, thereby increasing the safety of the device.

The working principle and the using flow of the utility model are as follows: when a key is used for normal unlocking, the key is inserted into the key slot 18, the movable rod 20 is driven by the round-head marble 19 to squeeze the marble spring 25 to enable the marble spring 25 to be on the same horizontal line, the inserted end of the key pushes one end of the rotary wheel 26 into the thumb wheel 11, then the key is rotated to enable the lock cylinder 10 and the thumb wheel 11 to rotate together for unlocking, when an illegal person is used for picking the lock, the thumb wheel 11 can be rotated for unlocking because one end of the rotary wheel 26 is pushed into the thumb wheel 11, the length of the key is fixed, when the length of the one end of the rotary wheel 26 pushed into the thumb wheel 11 by a picking tool exceeds the length of the key, the telescopic rod 31 is driven by the first spring 32 to enter the clamping slot 29 through the elastic force to lock the position of the rotary wheel 26, the thumb wheel 11 can not be driven to rotate to stir the adjusting box 12 to enable the bolt 2 to move, meanwhile, the clamping block 34 can be lifted by the triggering block 40 to be pressed to one end of the triggering rod 33, then one end of the movable rod 20 is loosened, at this time, the second rotating shaft 39 becomes a fulcrum, the tension of the tension spring 28 pulls the connecting block 38 to drive the other end of the movable rod 20 to the position of the fixed rod 23, the hinge point of the limiting rod 36 and the movable rod 20 takes the first rotating shaft 37 as the fulcrum to lift the other end of the first rotating shaft 37 to clamp one side of the fixed block 9, the position of the shaft rod 3 is stabilized, the lock tongue 4 cannot be retracted, the anti-prying effect is good, the safety of the device is improved, the tension of the tension spring 28 is increased, the tension of the movable rod 20 and the limiting rod 36 enables one end of the movable rod 20 to be always lower than the other end, the position of the limiting rod 36 can be better fixed, the shaft rod 3 cannot be retracted, even if an illegal molecule uses a tool to push or pull the lock tongue 4 from a door gap, the anti-prying and anti-theft performance of the lockset is enhanced, the safety of the lockset is improved.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims (7)

1. The utility model provides a coordinated control structure of anti-pick lock, includes casing (1), its characterized in that: the inside fixed mounting of casing (1) has lock shell (21), the inside fixed mounting of lock shell (21) has a plurality of marble springs (25), the top fixed mounting of marble spring (25) has flat marble (24), the top movable mounting of flat marble (24) has round head marble (19), the inside movable mounting of lock shell (21) has lock core (10), the inside of lock core (10) has seted up key slot (18), the inside movable mounting of lock core (10) has thumb wheel (11), the inside movable mounting of thumb wheel (11) has runner (26), the both sides fixed mounting of runner (26) has four spacing springs (27), the draw-in groove (29) have been seted up at the top of runner (26), one side fixed mounting of runner (26) has trigger piece (40), slotted hole (30) have been seted up at the top of thumb wheel (11), the top fixed mounting of slotted hole (30) has telescopic link (31), the outside movable sleeve of telescopic link (10) has first spring groove (32), the fixed mounting of thumb wheel (31) has at the bottom of the slot (31) has, one side of thumb wheel (41) is close to the fixed mounting of thumb wheel (11), one end of the clamping block (35) is fixedly provided with a trigger rod (33), one end of the trigger rod (33) is fixedly provided with a clamping block (34), one side of the inner cavity of the shell (1) is fixedly provided with two limiting blocks (6), the opposite sides of the two limiting blocks (6) are fixedly provided with stop blocks (42), one side of the inner cavity of the shell (1) is fixedly provided with a supporting block (8), the inside of the supporting block (8) is movably provided with a shaft lever (3), one side of the supporting block (8) is fixedly provided with a second spring (7), one end of the shaft lever (3) is fixedly provided with a fixed block (9), one end of the shaft lever (3) far away from the fixed block (9) is fixedly provided with a locking tongue (4), one side of the inner cavity of the shell (1) is fixedly provided with a fixed shaft (13), the outer side of the fixed shaft (13) is movably provided with a locking box (17), the inner side of the locking box (17) is provided with a sliding groove (43), the inner side of the locking box (17) is fixedly provided with a fixed plate (16), one side of the supporting block (8) is fixedly provided with a shaft lever (3), one end of the supporting block (8) is fixedly provided with a second spring (7), one end of the shaft lever (3) is fixedly provided with a fixed block is provided with a fixed top surface (9), one end of the fixed box (9), one end of the other end of the inner side of the inner cavity (12) is provided with two compression spring (12) is fixedly provided with two compression springs (12), one top spring (12) are fixedly provided with one top spring (12) respectively, the utility model discloses a lock is characterized in that two bolts (2) are hinged to opposite faces of two lock boxes (17), the outside of lock box (17) is hinged to have gangbar (5), one side fixed mounting of casing (1) inner chamber has second pivot (39), the outside movable mounting of second pivot (39) has movable rod (20), the bottom fixed mounting of movable rod (20) has connecting block (38), one side fixed mounting of casing (1) inner chamber has first pivot (37), the outside movable mounting of first pivot (37) has gag lever post (36), one side fixed mounting of casing (1) inner chamber has dead lever (23), the top surface fixed mounting of dead lever (23) has extension spring (28).

2. The interlock control structure of a pick-resistant lock as set forth in claim 1, wherein: one end of each of the four limiting springs (27) far away from the rotating wheel (26) is tightly attached to the inner side of the shifting wheel (11), one end of each of the first springs (32) is fixedly arranged at the top end of the corresponding slot hole (30), the other end of each of the first springs (32) is fixedly arranged on the top surface of the corresponding slot block (41), and the bottom surface of each slot block (41) is tightly attached to the top of the corresponding rotating wheel (26).

3. The interlock control structure of a pick-resistant lock as set forth in claim 1, wherein: one end of the trigger rod (33) far away from the clamping block (34) movably penetrates through the groove (22) and extends into the thumb wheel (11), and the bottom surface of the clamping block (34) is tightly attached to the top surface of the movable rod (20).

4. The interlock control structure of a pick-resistant lock as set forth in claim 1, wherein: one end of the second rotating shaft (39) far away from the shell (1) movably penetrates through the center point of the movable rod (20), and one end of the tension spring (28) far away from the fixed rod (23) is fixedly arranged in the connecting block (38).

5. The interlock control structure of a pick-resistant lock as set forth in claim 1, wherein: one end of the limiting rod (36) is hinged to one end of the side face of the movable rod (20), and the limiting rod (36) takes the first rotating shaft (37) as a center point to form an included angle inwards, and the included angle is 120 degrees.

6. The interlock control structure of a pick-resistant lock as set forth in claim 1, wherein: one end of the linkage rod (5) movably penetrates through the inner side of the stop block (42) and extends to the top of the stop block (42), and the other end of the linkage rod (5) is bent upwards by taking a hinge point of the linkage rod and the lock box (17) as a center to form an included angle, wherein the degree of the included angle is 60 degrees.

7. The interlock control structure of a pick-resistant lock as set forth in claim 1, wherein: one end of the shaft lever (3) far away from the fixed block (9) penetrates through one sides of the two limiting blocks (6) and extends to one side of the lock tongue (4), the second spring (7) is sleeved on the outer side of the shaft lever (3), and one end of the second spring (7) far away from the abutting block (8) is tightly attached to one side of the limiting block (6).