CN217631838U - Door lock - Google Patents

Abstract

The utility model relates to a security protection technical field discloses a door lock, include: the lock comprises a shell, a first lock tongue assembly, a second lock tongue assembly, a linkage assembly and an unlocking assembly; the first lock tongue component consists of a sliding frame, a turnover tongue and a first spring; the second lock tongue component consists of a sliding plate and a square tongue; the linkage assembly consists of a first stirring block, a second stirring block and a rotating wheel; the unlocking assembly consists of a mechanical lock cylinder, a third shifting block and a shifting plate. When the rotating wheel rotates, the first lug or the second lug on the rotating wheel can be abutted against the side wall of the first poking block, so that the overturning tongue limiting block at one end of the first poking block moves to the outside of the sliding frame and contacts with the locking of the first locking tongue assembly, and the first lug and the second lug can also drive the second poking block to rotate, so that the end part of the second poking block is positioned in the groove and the square tongue is driven to extend out of the shell or retract into the shell, thereby realizing locking and unlocking. When the rotating wheel has a fault, the unlocking can be realized by rotating the third toggle block.

Description

Door lock

Technical Field

The utility model relates to a security protection technical field, it is specific, relate to a door lock.

Background

The lock is in order to compromise convenient to use and high security, sets up two sets of spring bolt subassemblies usually, and another group of dead bolt of chooseing for use selects for use a set of dead bolt, and the dead bolt passes through the spring and can be in the lock body outside all the time, and the dead bolt only stretches out to the lock body outside when needing the lock door. Correspondingly, need set up one in the lock body and can control the link gear of these two sets of spring bolt subassemblies simultaneously to realize the switch lock, nevertheless if this link gear's partial structure trouble, cause easily and can not unblank.

SUMMERY OF THE UTILITY MODEL

The utility model relates to a solve above-mentioned technical problem and make, its purpose provides a lock, and two sets of spring bolt subassemblies in this lock can be controlled through a simple structure's interlock subassembly, still is equipped with reserve unblock subassembly simultaneously, can open the lock under emergency.

In order to achieve the above object, the present invention provides a door lock, including: a through hole for the bolt to extend out is arranged on one side of the shell; the first lock tongue component comprises a sliding frame which is fixed in the shell and one end of which is opposite to the through hole, a turnover tongue which is arranged in the sliding frame and a first spring of which the two ends are respectively connected with the turnover tongue and the sliding frame; the second bolt assembly comprises a sliding plate arranged in the shell in a sliding mode and a dead bolt which is fixed on the sliding plate and opposite to the through hole, and a groove is formed in one side of the sliding plate; the linkage assembly comprises a first poking block, a second poking block, a rotating wheel and a second spring, wherein the first poking block, the second poking block and the rotating wheel are rotatably arranged in the shell, and the second spring is arranged in the shell; one end of the second poking block is arranged in the groove, and a third bump is arranged on the side face of the second poking block; the side wall of the rotating wheel is provided with a first lug and a second lug which are positioned at two sides of the second poking block; one end of the first toggle block is provided with a turnover tongue limiting block capable of penetrating into the sliding frame, and the other end of the first toggle block is provided with a first support arm positioned on the motion track of the first convex block or the second convex block and a second support arm extending to one side of the groove; the unlocking assembly comprises a third shifting block rotatably arranged in the shell and a shifting plate slidably arranged in the shell; and the shifting plate is provided with a first stop block positioned on a rotating track of the outer end of the third shifting block, a second stop block positioned on the side surface of the second support arm and a third stop block positioned on the side surface of the third convex block.

Preferably, the method further comprises the following steps: and one end of the fourth spring is connected to the shell, the other end of the fourth spring is connected to the shifting plate, and acting force towards one side of the square tongue is applied to the shifting plate.

Preferably, the side surface of the shifting plate is further provided with two fourth convex blocks, the shell is provided with two sliding grooves for accommodating the fourth convex blocks, and the sliding grooves are parallel to the moving direction of the square tongues.

Preferably, a driving device with an output end being a gear is arranged in the shell; and teeth meshed with the gear are arranged on the periphery of the rotating wheel.

Preferably, two side walls of the groove are provided with inwards-recessed limiting parts; and a third spring is arranged in the shell, one end of the third spring is hinged in the shell, the other end of the third spring is hinged at the end part of the second toggle block, and acting force is applied to the second toggle block to enable the second toggle block to be abutted against the limiting part.

According to the above description and practice, the door lock of the present invention is provided with two sets of lock tongue assemblies, each of which is a turning tongue and a dead bolt, and the two sets of lock tongue assemblies can be controlled simultaneously by the linkage assembly to realize unlocking or locking, and the linkage assembly only comprises four components, so that the structure is simple; when linkage assembly or other structures break down, still can realize unblanking through the unblock subassembly, improved the security of lock.

Drawings

Fig. 1a and 1b are schematic structural diagrams of a door lock according to an embodiment of the present invention at two viewing angles, and illustrate an internal structure of the door lock when the door lock is closed by the linking assembly.

Fig. 2 is a schematic view of the connection between the turning wheel and the second tumbler and the slide plate after the lock is closed according to an embodiment of the present invention.

Fig. 3a and 3b are schematic structural diagrams of the door lock according to an embodiment of the present invention at two viewing angles, and illustrate an internal structure of the door lock when the door lock is unlocked by the linking assembly.

Fig. 4 is a schematic structural diagram of a second dial block according to an embodiment of the present invention.

Fig. 5 is a schematic structural view of a rotary wheel according to an embodiment of the present invention.

Fig. 6 is a schematic structural diagram of a door lock according to an embodiment of the present invention, showing an internal structure of the door lock when unlocking is completed by the unlocking assembly.

The reference numbers in the figures are:

1. the shell 2, the first bolt component 3, the second bolt component

4. Linkage assembly 5, driving device 6 and unlocking assembly

11. Through hole 12, fixed shaft 21, sliding frame

22. Turning tongue 23, first spring 24, positioning strip plate

31. Slide plate 32, square tongue 33, groove

34. First position-limiting part 35, second position-limiting part 41, first toggle block

42. Second spring 43, second toggle block 44, rotating wheel

45. Third spring 61, mechanical lock core 62, third toggle block

63. Toggle plate 64, fourth spring 411, turnover tongue limiting block

412. First arm 413, second arm 431, third projection

441. First projection 442, second projection 631 and first stopper

632. Second stop 633, third stop 634, fourth bump

Detailed Description

Exemplary embodiments will now be described more fully with reference to the accompanying drawings. The exemplary embodiments, however, may be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and a repetitive description thereof will be omitted. In the present disclosure, the terms "include", "arrange", "disposed" and "disposed" are used to mean open-ended inclusion, and mean that there may be additional elements/components/etc. in addition to the listed elements/components/etc.; the terms "first," "second," and the like are used merely as labels, and are not limiting as to the number or order of their objects; the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships that are based on the orientations or positional relationships shown in the drawings, and are merely for convenience in describing the present invention and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.

Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.

Fig. 1a and 1b are schematic structural views of the door lock in the embodiment at two viewing angles, in which the unlocking component is hidden to show the internal structure of the door lock when the locking is completed through the linkage component. Fig. 2 is a schematic view of the connection between the rotating wheel and the second tumbler and the sliding plate after the lock is closed in the embodiment. Fig. 3a and 3b are schematic structural views of the door lock in the embodiment at two viewing angles to show the internal structure of the door lock when unlocking is completed by the linkage assembly. Fig. 4 is a schematic structural diagram of the second dial block in the embodiment. Fig. 5 is a schematic structural view of the rotating wheel in this embodiment. Fig. 6 is a schematic structural diagram of a door lock according to an embodiment of the present invention, showing an internal structure of the door lock when unlocking is completed by the unlocking assembly.

Referring to fig. 1a to 6, the door lock of the embodiment includes: the lock comprises a shell 1, a first lock tongue component 2, a second lock tongue component 3, a linkage component 4 and an unlocking component 6, wherein the first lock tongue component 2, the second lock tongue component 3, the linkage component 4 and the unlocking component 6 are arranged in the shell, a user can simultaneously control the first lock tongue component 2 and the second lock tongue component 3 through the linkage component 4 so as to realize unlocking and locking, and the unlocking component 6 serves as a standby unlocking means and can be unlocked under emergency conditions.

Specifically, the housing 1 is formed by two half shells which are fastened together, a cavity is formed between the two half shells for accommodating the first bolt assembly 2, the second bolt assembly 3, the linkage assembly 4 and the unlocking assembly 6, and only one half shell of the housing 1 is shown in the attached drawings for showing the internal structure of the door lock. A plurality of through holes 11 for the protruding of the lock tongue are arranged on the wall of one side of the shell 1.

The first latch assembly 2 includes a sliding frame 21, a flip-flop tongue 22, and a first spring 23. The sliding frame 21 is a U-shaped frame, which is fixed on the inner wall of the housing 1, and the opening end of the frame faces the through hole 11, and the turning tongue 22 can turn inside the frame and slide along the length direction of the sliding frame 21. The first spring 23 is a compression spring, one end of which is connected to the flip tongue 22 and the other end of which is connected to the inner wall of the bottom surface of the sliding frame 21. The first spring 23 applies a force to the inverting tongue 22 toward the outside of the housing 1 so that the inverting tongue 22 is outside the housing 1 through the through hole 11. When the first latch bolt assembly 2 is applied to a door, in the door closing process, the inclined surface of the turning latch bolt 22 is extruded by the door frame to move towards the sliding frame 21, and meanwhile, the first spring 23 is pressed to store force, so that the turning latch bolt 22 is ejected out of the shell 1 by the first spring 23 after the door is closed; during the door opening process, the door frame presses the side of the turnover tongue 22, so that the turnover tongue 22 is turned inside the sliding frame 21, and the side of the turnover tongue 22 is subjected to the acting force exerted by the door frame, the acting force has a component force along the length direction of the first spring 23, so that the turnover tongue 22 can be contracted into the shell 1, and the unlocking and door opening are completed. In other words, the door lock is locked by restricting the turning of the turning tongue 22. In addition, in order to enhance the stability of the first spring 23, a positioning strip plate 24 is arranged in the sliding frame 21 along the length direction, the positioning strip plate 24 passes through a slot arranged on the bottom surface of the sliding frame 21 and is arranged on the sliding frame 21 in a spanning manner, a positioning plate capable of being abutted against the overturning tongue 22 is arranged at one end of the positioning strip plate 24 extending into the sliding frame 21, and the first spring 23 is connected to the positioning plate. In addition, the specific structure of the turning tongue 22 is prior art and not the innovation point of the present invention, and therefore, the detailed description thereof is omitted.

The second latch bolt assembly 3 includes a sliding plate 31 and three square bolts 32, as shown in fig. 1a and 1b, the sliding plate 31 is a plate body and is slidably disposed in the housing 1, and the three square bolts 32 are fixed at one end of the sliding plate 31 and face the through hole 11. The sliding plate 31 can drive the square tongue 32 to move in the through hole 11 when sliding, and extend out of the housing 1 or retract into the housing 1. As shown in fig. 1b, a groove 33 is disposed on the upper side of the sliding plate 31, a first position-limiting portion 34 recessed to the left is disposed on the left sidewall of the groove 33, and a second position-limiting portion 35 recessed to the right is disposed on the right sidewall of the groove 33, for connecting with the linkage assembly 4 to control the movement of the dead bolt 32. The sliding plate 31 is provided with a strip hole along the sliding direction of the square tongue 32, and the housing 1 is provided with the fixed shaft 12 inserted into the strip hole, so that the sliding direction of the sliding plate 31 can be limited, the sliding distance of the sliding plate 31 can be limited, in other words, the length of the square tongue 32 extending out of the housing 1 can be controlled by controlling the length of the strip hole.

The linkage assembly 4 includes a first dial 41, a second spring 42, a second dial 43 and a rotation wheel 44. The middle part of the first toggle block 41 is hinged to the housing 1, one end of the first toggle block close to the sliding frame 21 is provided with a turning tongue limiting block 411, and the side wall of the sliding frame 21 is provided with a hole for the turning tongue limiting block 411 to penetrate through. As shown in fig. 1a, when the first toggle block 41 rotates clockwise, the turning tongue limiting block 411 can penetrate into the sliding frame 21 to limit the turning of the turning tongue 22; when the first toggle block 41 rotates counterclockwise, the flip tongue stopper 411 moves out of the sliding frame 21, and the restriction of the flip tongue 22 is released. The end of the first dial block 41 away from the sliding frame 21 is provided with a first arm 412, and the first dial block 41 is pushed to rotate by the projection on the rotating wheel 44.

The second spring 42 is a torsion spring rotatably provided in the housing 1 in this embodiment, and one end of the torsion spring abuts on the housing 1, and the other end of the torsion spring abuts on one end of the first dial block 41 close to the slide frame 21, and applies a biasing force to the first dial block 41 toward the slide frame 21. As shown in fig. 1a, during unlocking, the first toggle block 41 rotates counterclockwise, the turning tongue limiting block 411 moves out of the sliding frame 21, the limitation on the turning tongue 22 is released, and at this time, the turning tongue 22 can turn over and enter the sliding frame 21; after unlocking is completed, the first spring 23 pushes the turnover tongue 22 out of the shell 1, and the second spring 42 pushes the turnover tongue limiting block 411 into the sliding frame 21 to continue limiting turnover of the turnover tongue 22. In other embodiments, the second spring 42 may be a compression/extension spring, and the position of the second spring 42 may be changed, so that the flip tongue stopper 411 can be moved into the sliding frame 21 only after the second spring 42 applies a force to the first toggle block 41.

One end of the second toggle block 43 is hinged in the housing 1, the other end is arranged in the groove 33 of the sliding plate 31, and the end of the second toggle block 43 can be switched between the first limiting part 34 and the second limiting part 35 by rotating. As shown in fig. 1b and fig. 3b, when the second toggle block 43 rotates counterclockwise, the end of the second toggle block 43 moves to the right, gradually approaches the right wall of the groove 33, pushes the sliding plate 31 to move to the right, so that the tongue 32 extends to the outside of the housing 1, and completes locking, and at this time, the end of the second toggle block 43 is located in the second position-limiting portion 35; when the second shifting block 43 rotates clockwise, the end of the second shifting block 43 moves to the left and gradually approaches the left wall of the groove 33, the sliding plate 31 is pushed to move to the left, the square tongue 32 is retracted into the housing 1, and the unlocking is completed, and at this time, the end of the second shifting block 43 is located in the first limiting part 34.

The rotating wheel 44 is hinged in the housing 1 coaxially with one end of the second dial 43 in this embodiment, and a first projection 441 and a second projection 442 are provided on both sides of the second dial 43 on the side of the rotating wheel 44. As shown in fig. 1a and fig. 2, the first protrusion 441 is disposed on the left side of the second dial block 43, and the second protrusion 442 is disposed on the right side of the second dial block 43. When the rotating wheel 44 rotates counterclockwise, the first protrusion 441 pushes the second toggle block 43 to rotate counterclockwise, so as to bring the dead bolt 32 into the housing 1, and release the locking of the second bolt assembly 3, and the second protrusion 442 abuts against the side surface of the first support arm 412, so as to drive the first toggle block 41 to rotate counterclockwise, so that the flip bolt limiting block 411 moves out of the sliding frame 21, and release the limitation on the flip bolt 22, and then release the locking of the first bolt assembly 2; when the rotating wheel 44 rotates clockwise, the second protrusion 442 leaves the first support arm 412, the first toggle block 41 rotates clockwise under the action of the second spring 42, so that the toggle tongue limiting block 411 moves into the sliding frame 21 to limit the toggle tongue 22, and the first latch bolt assembly 2 is locked, and then the second protrusion 442 abuts against the side surface of the second toggle block 43 and pushes the second toggle block 43 to rotate clockwise, so that the square tongue 32 is brought out of the housing 1, and the second latch bolt assembly 3 is locked.

When the door lock is used, the movement modes of the two bolt components can be controlled simultaneously by controlling the linkage component 4, so that unlocking and locking are realized. In this embodiment, a driving device 5 is further disposed in the housing 1, the output end of the driving device is a gear, and teeth engaged with the gear are disposed on the periphery of the rotating wheel 44, so that the driving device 5 can control the rotating direction and angle of the rotating wheel 44, and further control the unlocking and locking of the door lock. The drive means 5 is in this embodiment in the form of an electric motor plus a transmission, the output of which is a gear, although other known drive arrangements may be used. In another embodiment, the rotation of the rotator wheel 44 can also be achieved by a mechanical key and a key cylinder structure, and the rotation direction and angle of the rotator wheel 44 are controlled by rotating the key.

The structure, position and linkage relation of the first bolt assembly 2, the second bolt assembly 3 and the linkage assembly 4 in the door lock are shown in the attached drawings, in other embodiments, the unlocking and locking of the door lock can be controlled by the linkage relation after the positions and the detailed structures of the first bolt assembly, the second bolt assembly 3 and the linkage assembly are changed, and specific structures are not repeated.

Since two convex blocks on the rotating wheel 44 need to push the first dial block 41 and the second dial block 43, the two convex blocks are easily damaged after long-time use, so that the lock cannot be unlocked; in addition, there is a possibility of malfunction of the driving device that rotates the rotary wheel. In this embodiment, therefore, a release assembly 6 is also provided for unlocking in those emergency situations. As shown in fig. 3a to 6, an extended second arm 413 is further disposed at an end of the first toggle block 41 away from the flip tongue stopper 411, and the second arm 413 extends downward in the drawing. A third protrusion 431 is provided on a side surface of the second dial block 43. The unlocking assembly 6 is arranged in the housing 1 and comprises a mechanical lock cylinder 61, a third dial block 62 and a dial plate 63. The mechanical lock cylinder 61 is fixed on the housing 1 and penetrates through the housing 1, one end of the third dial block 62 is rotatably arranged in the middle of the mechanical lock cylinder 61, the third dial block 62 can be rotated by a mechanical key inserted into the mechanical lock cylinder 61, and the outer end of the third dial block 62 extends towards the periphery of the mechanical lock cylinder 61. As shown in fig. 6, the dial plate 63 is slidably disposed in the housing 1, a first stop 631 capable of cooperating with the third dial block 62 is disposed at a lower side of the dial plate 63, the first stop 631 is located on a rotation track of an outer end of the third dial block 62, and when the third dial block 62 is rotated clockwise, the dial plate 63 is pushed to slide to the right. The second stopper 632 is disposed on the upper side of the dial plate 63, the second stopper 632 is disposed on the left side of the second arm 413, and when the dial plate 63 slides to the right side, the second arm 413 can be driven to rotate counterclockwise, so that the flip tongue stopper 411 moves out of the sliding frame 21, and the limitation of the flip tongue 22 is released. A third stop 633 is further arranged on the upper side of the shifting plate 63, the third stop 633 is arranged on the left side of the third projection 431, when the shifting plate 63 slides to the right side, the third stop 633 abuts against the third projection 431 and can drive the second shifting block 43 to rotate anticlockwise, so that the sliding plate 31 moves to the right side, the square bolt 32 retracts into the housing 1, the locking of the second bolt assembly 3 is released, and the unlocking is realized.

In this embodiment, one end of the third dial block 62 is rotatably disposed on the mechanical lock cylinder 61, and the third dial block 62 is rotated by a mechanical key, but it goes without saying that other known structures may be used to achieve this process, such as a knob directly disposed on the housing and connected to the third dial block 62, to directly rotate the third dial block 62 to achieve unlocking.

Further, a fourth spring 64 is provided in the housing 1, and as shown in fig. 6, in this embodiment, the fourth spring 64 is a compression spring having one end connected to the housing 1 and the other end connected to the right side of the dial plate 63. After the unlocking is completed through the mechanical key, the fourth spring 64 is pressed to apply acting force towards the left side to the shifting plate 63, so that the shifting plate 63 is restored to the initial position, and the manual adjustment of the position of the shifting plate 63 is avoided.

In addition, two fourth protrusions 634 are further disposed on the side surface of the dial plate 63, and two sliding grooves for accommodating the fourth protrusions 634 are disposed on the housing 1, and the sliding grooves are disposed parallel to the moving direction of the tongues 32, so that the dial plate 63 can stably slide in the housing 1 along the moving direction of the tongues 32.

In addition, in this embodiment, a controller, such as a PLC (programmable logic controller), for controlling the driving device 5 is provided in the housing 1, and the controller is connected to the driving device 5 in a communication manner, and an unlocking program and a locking program are preset in the controller. Referring to fig. 1a and fig. 2, when the unlocking procedure is triggered, the controller opens the driving device 5 to drive the rotating wheel 44 to rotate counterclockwise, so that the turning tongue limiting block 411 moves out of the sliding frame 21, the end of the second toggle block 43 moves into the first limiting portion 34, and the square tongue 32 is driven to move into the housing 1 to complete unlocking; when the locking procedure is triggered, the controller opens the driving device 5 to drive the rotating wheel 44 to rotate clockwise, so that the second protrusion 442 leaves the first moving block 41, the turning tongue limiting block 411 moves into the sliding frame 21 to limit the turning tongue 22, and the second protrusion 442 also pushes the end of the second moving block 43 to move into the second limiting portion 35 and drives the square tongue 32 to move out of the housing 1 to complete locking. Needless to say, when the controller or its control circuit malfunctions, the unlocking can be performed temporarily by the unlocking assembly 6 as well.

In addition, an authentication module and a location identification module are provided in this embodiment, which are connected to the controller. The identity authentication module is used for authenticating the identity of a user and triggering the unlocking program to unlock after the user identity authentication is passed; the position identification module is used for monitoring the position of the door lock, and triggering the locking procedure to lock when the door lock is in a locking position (for example, a door closing state). The identity authentication module can be realized by the prior art such as a password input module, a fingerprint identification module, a face recognition module and the like, and the position identification module can be realized by the prior art such as a geomagnetic sensor, an accelerometer or a gyroscope and the like. For occasions where authentication is not needed, the authentication module can be eliminated, for example, doors in public areas are not needed, authentication is not needed when a user unlocks on one side of the inside of the door, and an unlocking program can be directly triggered through a switch and other devices. The position recognition module can be changed into a switch or other devices, and the unlocking program is triggered manually.

In addition, in this embodiment, a third spring 45 is further provided, please refer to fig. 1b and fig. 3b, the third spring 45 is a torsion spring, one end of which is hinged on the first fixed shaft 12 in the housing 1, and the other end of which is hinged on the end of the second toggle block 43. A cylindrical connecting shaft is arranged at the end of the second toggle block 43, and the other end of the third spring 45 is sleeved on the connecting shaft. The third spring 45 is in compression and the two torsion arms have a tendency to splay to either side. After the lock is closed, the end part of the second toggle block 43 is positioned in the second limiting part 35, and the third spring 45 can abut against the second limiting part 35 to prevent the square tongue 32 from moving towards the shell 1; after unlocking, the end of the second toggle block 43 is located in the first stopper 34, and the third spring 45 can abut against the first stopper 34 to prevent the square tongue 32 from moving out of the housing 1. Thereby enabling the door lock to be in a stably locked state and an unlocked state.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims (5)

1. A door lock, comprising:

a through hole for the bolt to extend out is arranged on one side of the shell;

the first lock tongue component comprises a sliding frame which is fixed in the shell and one end of which is opposite to the through hole, a turnover tongue which is arranged in the sliding frame and a first spring of which the two ends are respectively connected with the turnover tongue and the sliding frame;

the second bolt assembly comprises a sliding plate arranged in the shell in a sliding mode and a dead bolt which is fixed on the sliding plate and opposite to the through hole, and a groove is formed in one side of the sliding plate;

the linkage assembly comprises a first poking block, a second poking block, a rotating wheel and a second spring, wherein the first poking block, the second poking block and the rotating wheel are rotatably arranged in the shell, and the second spring is arranged in the shell; one end of the second poking block is arranged in the groove, and a third bump is arranged on the side face of the second poking block; the side wall of the rotating wheel is provided with a first convex block and a second convex block which are positioned at two sides of the second toggle block; one end of the first toggle block is provided with a turnover tongue limiting block capable of penetrating into the sliding frame, and the other end of the first toggle block is provided with a first support arm positioned on the motion track of the first convex block or the second convex block and a second support arm extending to one side of the groove;

the unlocking assembly comprises a third shifting block rotatably arranged in the shell and a shifting plate slidably arranged in the shell; and the shifting plate is provided with a first stop block positioned on a rotating track of the outer end of the third shifting block, a second stop block positioned on the side surface of the second support arm and a third stop block positioned on the side surface of the third convex block.

2. The door lock of claim 1, further comprising:

and one end of the fourth spring is connected to the shell, the other end of the fourth spring is connected to the shifting plate, and acting force towards one side of the square tongue is applied to the shifting plate.

3. The door lock of claim 1,

the side of the shifting plate is also provided with two fourth convex blocks, the shell is provided with two sliding chutes for containing the fourth convex blocks, and the sliding chutes are parallel to the moving direction of the square tongue.

4. The door lock of claim 1,

a driving device with an output end being a gear is arranged in the shell;

and teeth meshed with the gear are arranged on the periphery of the rotating wheel.

5. The door lock of claim 1,

two side walls of the groove are provided with inwards sunken limiting parts;

and a third spring is arranged in the shell, one end of the third spring is hinged in the shell, the other end of the third spring is hinged at the end part of the second toggle block, and acting force is applied to the second toggle block to enable the second toggle block to be abutted against the limiting part.

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