Lock with a square tongue component

Abstract

The present invention relates to the technical field of locks, and discloses a lock with a square tongue assembly, which includes a housing and a square tongue assembly arranged therein. The square tongue assembly includes: a square tongue, slidably arranged in a square tongue hole on one side of the housing, and connected to a square tongue plate slidably arranged in the housing on the side away from the square tongue hole; a locking plate, arranged on the side surface of the square tongue plate, rotatably connected to the square tongue plate at one end, and provided with a first limiting portion extending laterally at the other end; a locking block, fixedly arranged in the housing; a first return spring, arranged in the housing, applying a force to the locking plate after being compressed to restore the locking plate to its initial state; in the initial state, the first limiting portion is located at the end of the locking block away from or close to the square tongue, and at the same time the square tongue is inside or outside the square tongue hole; after rotating the locking plate, the first limiting portion can be located at the side of the locking block; the first return spring can restore the locking plate to its initial state. The lock with the square tongue assembly has a simple structure, stable use, and will not generate excessive noise.

Description

Technical Field

[0001] The present invention relates to the technical field of locks, and in particular to a lock with a square tongue assembly. Background Art

[0002] In order to improve the safety performance of locks, a square tongue is usually added on the basis of the inclined tongue. Adding a square tongue means that a corresponding structure that can be linked with the lock core needs to be added. In order to achieve the locking function, the square tongue assembly in the current lock needs to be equipped with many parts. Among them, the structure that limits the displacement of the square tongue is prone to getting stuck during use, affecting the normal use of the lock. In addition, the linkage between the parts will also generate a lot of noise during use. Summary of the invention

[0003] The present invention is made to solve the above technical problems, and its purpose is to provide a lock with a tongue assembly which has a simple structure, is stable in use, and does not generate a lot of noise.

[0004] In order to achieve the above-mentioned object, the present invention provides a lock with a square tongue assembly, comprising a shell and a square tongue assembly arranged therein, wherein the square tongue assembly comprises: a square tongue, which is slidably arranged in a square tongue hole on one side of the shell, and a side away from the square tongue hole is connected to a square tongue plate slidably arranged in the shell; a locking plate, which is arranged on the side of the square tongue plate, one end of which is rotatably connected to the square tongue plate, and the other end of which is provided with a first limiting portion extending laterally; a locking block, which is fixedly arranged in the shell; a first return spring, which is arranged in the shell and applies a force to the locking plate after being compressed, so that The locking plate returns to its initial state; in the initial state, the first limiting portion is located at one end of the locking block away from or close to the square tongue hole, and the square tongue is in the square tongue hole or outside the square tongue hole, and the sliding of the square tongue is restricted at this time; after the locking plate is rotated, the first limiting portion can be located on the side of the locking block, and the square tongue can slide to the outside or inside of the square tongue hole under the action of external force, and the first return spring is compressed at the same time; after the locking plate loses external force, the first return spring can restore the locking plate to its initial state.

[0005] Preferably, a first shifting groove is provided on one side of the square tongue plate, and one side of the locking plate covers the first shifting groove; a shifting peach is also rotatably provided in the shell, wherein when the shifting peach rotates, one end can drive the locking plate to rotate, so that the first limiting portion moves to the side of the locking block, and at the same time, one end of the shifting peach rotates into the first shifting groove, and then the square tongue plate can be pushed to slide in the shell by continuously rotating the shifting peach.

[0006] Preferably, a second limiting portion extending toward the side of the square tongue plate is further provided on the side of the locking plate away from the first dial groove, and the acting force applied by the first return spring to the locking plate can make the second limiting portion abut against the side surface of the square tongue plate on the side away from the first dial groove.

[0007] Preferably, a recessed portion having the same shape as the first limiting portion and the second limiting portion is provided on the square tongue plate. In the initial state, the side surfaces of the first limiting portion and the second limiting portion abut against the recessed portion.

[0008] Preferably, a sliding hole is provided on the square tongue plate along the sliding direction of the square tongue; a sliding shaft is provided in the housing and is inserted into the sliding hole.

[0009] Preferably, an inclined tongue assembly is further provided in the housing. The inclined tongue assembly includes an inclined tongue, a first dial plate, and a second return spring. Among them, the middle part of the first dial plate is rotatably arranged in the housing, and one end can rotate to the path where the inclined tongue retracts into the housing under the action of the second return spring and limit the movement of the inclined tongue; the square tongue assembly further includes a second dial plate. The second dial plate is arranged on the side of the square tongue plate away from the locking plate, and the middle part is rotatably connected to the square tongue plate. One end abuts against the other end of the first dial plate, and the other end is arranged at the rotation track of the end of the dial cam; when the dial cam rotates, it can drive the second dial plate to rotate and then drive the first dial plate to rotate, so that one end of the first dial plate releases the limit on the inclined tongue.

[0010] Preferably, a rotating shaft is inserted through the square tongue plate, and both ends of the rotating shaft are inserted into the rotating shaft grooves respectively arranged on the locking plate and the second dial plate.

[0011] Preferably, the first return spring is of a double-torsion spring structure, which is sleeved on the rotating shaft. One torsion arm abuts against the locking plate, the other torsion arm abuts against the second dial plate, and the middle torsion arm straddles the square tongue plate.

[0012] Preferably, a third limiting portion is further provided on the second dial plate, and the third limiting portion abuts against the side of the square tongue plate away from the dial cam.

[0013] Preferably, a second dial groove is provided on the square tongue plate, and the end of the second dial plate close to the dial cam covers the second dial groove.

[0014] According to the above description and practice, the lock with a square tongue assembly described in the present invention has a simpler structure than the square tongue assembly in the traditional lock. By setting a rotatable locking plate on the square tongue plate, and then cooperating with the locking block on the shell, the tongue can be limited. The linkage process is relatively stable and not prone to failure. In addition, when the square tongue assembly moves, it is connected to the sliding shaft in a rolling manner, and the noise is relatively small. In addition, when the first limiting part is restored to the two initial states, it will not be in direct contact with the locking block, but is only at the two ends of the locking block. While achieving the limitation of the tongue plate, it can also avoid noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the internal structure of a lock with a square tongue assembly involved in one embodiment of the present invention when the square tongue is retracted into the housing.

[0016] Figure 2 It is a schematic diagram of the internal structure of a lock with a square tongue assembly involved in one embodiment of the present invention when the square tongue is extended out of the housing.

[0017] Figure 3a and Figure 3b Schematic diagram of the exploded structure of the tongue assembly involved in one embodiment of the present invention at two different viewing angles.

[0018] The reference numerals in the figure are:

[0019] 1. Housing; 11. Sliding shaft; 12. Locking block; 21. Square tongue; 22. Oblique tongue; 3. Square tongue plate; 31. Sliding hole; 32. First shifting groove; 33. Second shifting groove; 34. Recessed portion; 4. Locking plate; 41. First limiting portion; 42. Second limiting portion; 51. First return spring; 52. Second return spring; 6. Piece; 71. Rotating shaft; 72. Rotating shaft groove; 81. First shifting plate; 82. Second shifting plate; 821. Third limiting portion; 9. Boss. DETAILED DESCRIPTION

[0020] The exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that the disclosure will be more comprehensive and complete and fully convey the concepts of the exemplary 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.

[0021] In addition, the accompanying drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the figures represent the same or similar parts, and thus their repeated descriptions will be omitted. It should be noted that in the present disclosure, the terms "including", "configured with", and "set in" are used to express the meaning of open-ended inclusion, and mean that in addition to the listed elements / components / etc., there may be other elements / components / etc.; the terms "first", "second", etc. are only used as marks, and are not restrictions on the number or order of their objects; the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0022] Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] In this embodiment, a lock having a tongue assembly is disclosed. Figure 1 The figure shows the internal structure of the lock with the square tongue assembly when the square tongue is retracted into the housing. Figure 2 The figure shows the internal structure of the lock with the square tongue assembly when the square tongue is extended out of the housing. Figure 3a and Figure 3b Schematic diagram of the exploded structure of the square tongue assembly at two different angles in this embodiment.

[0024] Please refer to Figures 1 to 3b The lock with a square tongue assembly comprises a housing 1 and a square tongue assembly disposed therein, wherein the square tongue assembly comprises a square tongue 21, a square tongue plate 3, a locking plate 4 and a first return spring 51. The housing 1 is formed by two half shells, with a cavity for accommodating the square tongue assembly formed in the middle. Figure 1 and Figure 2 Only one half shell of the housing 1 is shown, and the other half shell can be connected with it by snap-fitting or bolting. A square tongue hole for the square tongue 21 to extend / retract is provided on the side of the housing 1.

[0025] See Figure 1 and Figure 2, the square tongue 21 is slidably arranged in the square tongue hole, and the right end is fixedly connected to the square tongue plate 3. The square tongue plate 3 is also slidably arranged in the housing 1, and its sliding direction is the same as that of the square tongue 21. By arranging the square tongue plate 3, the stability of the square tongue 21 can be improved, and the interlocking of the square tongue 21 with other structures can be realized. In this embodiment, a sliding hole 31 is arranged in the middle of the square tongue plate 3 along the sliding direction of the square tongue 21. At the same time, a sliding shaft 11 is arranged on the housing 1 and passes through the sliding hole 31. Through the square tongue hole and the sliding shaft 11, the square tongue 21 and the square tongue plate 3 can only slide in the housing 1 and will not move in other directions. In addition, both ends of the sliding shaft 11 are rotatably connected to the inner wall of the housing 1, which can reduce the friction between the square tongue plate 3 and the sliding shaft 11, making the sliding of the square tongue plate 3 smoother and with lower noise. In other embodiments, the sliding assembly of the two can also be realized by arranging structures such as sliders and chutes on the square tongue plate 3 and the inner wall of the housing 1.

[0026] Please refer to Figure 3a and Figure 3b , the locking plate 4 is arranged on the side of the square tongue plate 3, one end is rotatably connected to the square tongue plate 3, and the other end is provided with a first limiting portion 41 extending laterally. At the same time, a locking block 12 is arranged on the housing 1. In this embodiment, the locking block 12 is a protruding structure formed by stamping the inner wall of the housing 1 inward. In other embodiments, it can also be a block fixed to the inner wall of the housing 1. When the square tongue 21 extends out of the square tongue hole or retracts into the square tongue hole, the first limiting portion 41 is respectively located at the left and right ends of the locking block 12. The left and right movement of the first limiting portion 41 is restricted by the locking block 12, and thus the left and right movement of the square tongue 21 is restricted.

[0027] Figure 1 and Figure 2The internal structure of the lock in two initial states, when the square tongue 21 is extended and retracted, is shown. Specifically, when the square tongue 21 is retracted, the first limit portion 41 is at the right end of the locking block 12. If the square tongue plate 3 moves to the left, the left side of the first limit portion 41 will abut against the locking block 12, thereby limiting the square tongue 21 from extending out of the square tongue hole. At this time, only after the locking plate 4 is rotated to rotate the first limit portion 41 to the top of the locking block 12, can the square tongue 21 and the square tongue plate 3 be slid, thereby allowing the square tongue 21 to extend out of the square tongue hole. In another initial state, the square tongue 21 extends out of the square tongue hole, and the first limiting portion 41 is at the left end of the locking block 12. If the square tongue plate 3 moves to the right end, the right side of the first limiting portion 41 will abut against the locking block 12, thereby limiting the square tongue 21 from retracting into the square tongue hole. At this time, only by rotating the locking plate 4 and rotating the first limiting portion 41 to the top of the locking block 12 can the square tongue 21 and the square tongue plate 3 be slid, thereby retracting the square tongue 21 into the square tongue hole. In both initial states, the sliding of the square tongue 21 is restricted, and the square tongue 21 cannot be moved from the outside of the lock by a strong magnetic device, thereby improving the safety of the lock. It should be noted that the rotation of the locking plate 4 can be achieved by the existing peach or other driving structure, device, etc. in the lock.

[0028] The first return spring 51 is arranged in the housing 1, and one end is connected to the locking plate 4. In the above two initial states, when the locking plate 4 rotates under the action of external force and moves the first limiting portion 41 to the top of the locking block 12, the first return spring 51 is compressed and applies a force to the locking plate 4. After the locking plate 4 loses the external force, the force applied by the first return spring 51 can restore the locking plate 4 to the initial state, thereby limiting the tongue 21. Figure 1 , Figure 3a and Figure 3b The force applied by the first return spring 51 to the locking plate 4 can cause the locking plate 4 to rotate in the clockwise direction in the figure, and then the first limiting portion 41 moves from the top of the locking block 12 to the left end or the right end of the locking block 12.

[0029] The lock with the square tongue assembly in this embodiment has a simpler structure than the square tongue assembly in the traditional lock. By setting a rotatable locking plate 4 on the square tongue plate 3 and cooperating with the locking block 12 on the housing 1, the position limiting of the opposite tongue 21 can be achieved. The linkage process is relatively stable and not prone to failure. In addition, when the square tongue assembly moves, it is in rolling connection with the sliding shaft 11, and the noise is relatively small. In addition, when the first limiting portion 41 is restored to the two initial states, it will not be in direct contact with the locking block 12, but is only at the two ends of the locking block 12, which can achieve the position limiting of the opposite tongue plate 3 while avoiding the generation of noise.

[0030] In addition, in this embodiment, a first dial groove 32 is provided on the lower side of the square tongue plate 3, and one side of the locking plate 4 covers the first dial groove 32; at the same time, a dial cam 6 is rotatably provided in the housing 1, and the rotation trajectory of one end of the dial cam 6 passes through the first dial groove 32. Please refer to Figure 1 , when the dial cam 6 rotates counterclockwise, after one end abuts against the locking plate 4, the locking plate 4 can be toggled to rotate counterclockwise, so that the first limiting portion 41 moves to the upper side of the locking block 12. At the same time, this end of the dial cam 6 will rotate into the first dial groove 32. After that, continuously rotating the dial cam 6 can push the square tongue plate 3 to slide leftward in the housing 1, so that the square tongue 21 extends out of the square tongue hole; then, the force applied to the dial cam 6 is removed, and the first return spring 51 can drive the locking plate 4 to rotate clockwise, so that the first limiting portion 41 is located at the left end of the locking block 12. Please refer to Figure 2 , when the dial cam 6 rotates clockwise, after one end abuts against the locking plate 4, the locking plate 4 can be toggled to rotate counterclockwise, so that the first limiting portion 41 moves to the upper side of the locking block 12. At the same time, this end of the dial cam 6 will rotate into the first dial groove 32. After that, continuously rotating the dial cam 6 can push the square tongue plate 3 to slide rightward in the housing 1, so that the square tongue 21 retracts into the square tongue hole; then, the force applied to the dial cam 6 is removed, and the first return spring 51 can drive the locking plate 4 to rotate clockwise, so that the first limiting portion 41 is located at the right end of the locking block 12. This is a structural form for realizing the rotation of the locking plate 4. In other embodiments, a transmission structure such as a motor or a gear can also be used to rotate the locking plate 4, and the same effect of extending and retracting the square tongue 21 can be achieved.

[0031] In addition, in this embodiment, a second limiting portion 42 extending toward the square tongue plate 3 is further provided on the upper side of the locking plate 4. The force applied by the first return spring 51 to the locking plate 4 can make the second limiting portion 42 abut against the upper side surface of the square tongue plate 3, playing a role in limiting the rotation of the locking plate 4 and preventing the locking plate 4 from rotating below the square tongue plate 3. In this embodiment, the second limiting portion 42 is a strip-shaped structure, which can increase the contact area with the square tongue plate 3. When the first return spring 51 pushes the locking plate 4 back to the initial state, the collision between the second limiting portion 42 and the square tongue plate 3 will not generate a large noise. In addition, the first limiting portion 41 can also be set as an L-shaped structure, so that its upper side can abut against the upper side of the square tongue plate 3, and the same effect of limiting the locking plate 4 as the second limiting portion 42 can be achieved. In addition, a recessed portion 34 having the same shape as the first limiting portion 41 and the second limiting portion 42 is further provided on the square tongue plate 3. In the above two initial states, the sides of the first limiting portion 41 and the second limiting portion 42 abut against the recessed portion 34, increasing the contact area between the square tongue plate 3 and the locking plate 4, thereby improving the connection stability between the two.

[0032] In addition, in this embodiment, a bevel tongue assembly is further provided in the housing 1. The bevel tongue assembly includes a bevel tongue 22, a first dial 81, and a second return spring 52. Among them, the bevel tongue 22 is arranged in the bevel tongue hole and can extend and retract; the middle part of the first dial 81 is rotatably arranged in the housing 1, and the second return spring 52 applies a force to the first dial 81 so that it can rotate in the Figure 1 clockwise direction as shown in Figure 1 . The upper end of the first dial 81 can rotate to the path where the bevel tongue 22 retracts into the housing 1 under the action of the second return spring 52 and restrict the movement of the bevel tongue 22. After applying an external force to the first dial 81 and overcoming the resistance of the second return spring 52, the upper end of the first dial 81 can be moved outside the movement path of the bevel tongue 22 to release the limit on the bevel tongue 22. Then, the bevel tongue 22 can retract into the housing 1 under the action of the linkage mechanism. The linkage mechanism of the bevel tongue 22 is not an innovation point of this application, and there are various linkage structures in the prior art that can realize the movement of the bevel tongue 22, so it will not be elaborated here.

[0033] The square tongue assembly in this embodiment further includes a second dial 82 that can be linked with the first dial 81. As shown in the figure, the second dial 82 and the locking plate 4 are respectively arranged on both sides of the square tongue plate 3, and it is also rotatably connected to the square tongue plate 3. Specifically, a rotating shaft 71 is passed through the square tongue plate 3, and at the same time, rotating shaft grooves 72 are respectively arranged on the sides of the locking plate 4 and the second dial 82 close to the square tongue plate 3 to accommodate the ends of the rotating shaft 71, so as to realize the rotational connection between the locking plate 4 and the square tongue plate 3, and the rotational connection between the second dial 82 and the square tongue plate 3. This structure can realize the rotational connection between the square tongue plate 3, the locking plate 4, and the second dial 82 without affecting their sliding in the housing 1. In other embodiments, the rotating shaft 71 can also pass through the square tongue plate 3, the locking plate 4, and the second dial 82 at the same time, and both ends are slidably arranged on the inner wall of the housing 1, which can also realize the above functions.

[0034] As Figure 1 and Figure 2 shown, the upper end of the second dial 82 abuts against the lower end of the first dial 81, and the lower end of the second dial 82 is arranged on the trajectory when the end of the dial cam 6 rotates clockwise. Therefore, when the dial cam 6 rotates clockwise, it can drive the second dial 82 to rotate counterclockwise, and the upward movement of its upper end can drive the first dial 81 to rotate counterclockwise, finally moving the upper end of the first dial 81 outside the movement path of the bevel tongue 22 to release the limit on the bevel tongue 22. That is to say, the limit on the bevel tongue 22 can be released by rotating the dial cam 6. The upper end surface of the second dial 82 and the lower end surface of the first dial 81 are both parallel to the sliding direction of the square tongue plate 3. Therefore, when the square tongue plate 3 slides, the first dial 81 will not rotate.

[0035] In addition, in this embodiment, the first return spring 51 is of a double-torsion spring structure. It is sleeved on the rotating shaft 71. One end torsion arm abuts against the locking plate 4, the other end torsion arm abuts against the second dial plate 82, and the middle torsion arm straddles the square tongue plate 3. When the locking plate 4 rotates counterclockwise, the first return spring 51 is compressed and can push the locking plate 4 to rotate clockwise; when the second dial plate 82 rotates counterclockwise, the first return spring 51 is compressed and can push the second dial plate 82 to rotate clockwise.

[0036] Please refer to Figure 3a , a third limiting portion 821 is further provided on the second dial plate 82. The third limiting portion 821 abuts against the side of the square tongue plate 3 away from the dial cam 6. Therefore, when the first return spring 51 pushes the second dial plate 82 to rotate clockwise, the second dial plate 82 can be limited by the third limiting portion 821 so that it will not rotate by too large an angle, and the lower end of the second dial plate 82 can be located on the rotation track of the end portion of the dial cam 6.

[0037] In addition, a second dial groove 33 is further provided on the square tongue plate 3. One end of the second dial plate 82 close to the dial cam 6 covers the second dial groove 33. After setting the second dial groove 33, the rotation range of the dial cam 6 can be enlarged, and then the length of the second dial plate 82 can be shortened, which can save materials and reduce costs.

[0038] In this embodiment, a sliding shaft 11 is passed through the middle of the square tongue plate 3. Correspondingly, the right end of the locking plate 4 is set to a U-shaped structure and straddles both sides of the sliding shaft 11. When the second limiting portion 42 is not provided, the rotation range of the locking plate 4 can also be limited by the sliding shaft 11.

[0039] In addition, in this embodiment, the locking block 12 is located above the square tongue plate 3, and the first dial groove 32 is provided on the lower side of the square tongue plate 3. In other embodiments, the positions of the two can be interchanged, and the above functions can also be achieved.

[0040] In addition, a number of bosses 9 are further provided on the sides of the locking plate 4 and the second dial plate 82 close to the inner wall of the housing 1. The bosses 9 abut against the inner wall of the housing 1, reducing the contact area between the locking plate 4, the second dial plate 82 and the inner wall of the housing 1, and enabling the sliding of the square tongue 21 and the locking plate 4 and the rotation of the locking plate 4 and the second dial plate 82 to be more smooth.

[0041] It is obvious to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims concerned.

Claims

1. A lock with a square tongue component, characterized in that It comprises a housing and a tongue assembly arranged therein, wherein the tongue assembly comprises: A square tongue is slidably arranged in a square tongue hole on one side of the shell, and a square tongue plate slidably arranged in the shell is connected to a side away from the square tongue hole; A locking plate, arranged on the side of the square tongue plate, one end of which is rotatably connected to the square tongue plate, and the other end of which is provided with a first limiting portion extending laterally; A locking block, fixedly arranged in the housing; The first return spring is arranged in the housing and applies a force to the locking plate after being compressed, so that the locking plate returns to its initial state; In the initial state, the first limiting portion is located at one end of the locking block away from or close to the square tongue hole, and the square tongue is inside or outside the square tongue hole, and the sliding of the square tongue is restricted; after the locking plate is rotated, the first limiting portion can be located on the side of the locking block, and the square tongue can slide to the outside or inside of the square tongue hole under the action of external force, and the first return spring is compressed; after the locking plate loses external force, the first return spring can restore the locking plate to its initial state.

2. The lock with a tongue assembly according to claim 1, characterized in that: A first shifting groove is provided on one side of the square tongue plate, and one side of the locking plate covers the first shifting groove; A peach is also rotatably provided in the shell, wherein when the peach rotates, one end of the peach can drive the locking plate to rotate, so that the first limiting portion moves to the side of the locking block, and at the same time, one end of the peach rotates into the first shifting groove, and then the peach is continuously rotated to push the square tongue plate to slide in the shell.

3. The lock with a tongue assembly according to claim 2, characterized in that: A second limiting portion extending toward one side of the square tongue plate is further provided on the side of the locking plate away from the first shifting slot, and the force applied to the locking plate by the first return spring can cause the second limiting portion to abut against the side surface of the square tongue plate away from the first shifting slot.

4. The lock with a tongue assembly according to claim 3, characterized in that: The square tongue plate is provided with a recessed portion having the same shape as the first limiting portion and the second limiting portion. In an initial state, the side surfaces of the first limiting portion and the second limiting portion abut against the recessed portion.

5. The lock with a tongue assembly according to claim 2, characterized in that: The square tongue plate is provided with a sliding hole along the sliding direction of the square tongue; The housing is provided with a sliding shaft which penetrates the sliding hole.

6. The lock having a tongue assembly according to any one of claims 2 to 5, characterized in that: The housing is also provided with an inclined tongue assembly, which includes an inclined tongue, a first shift plate and a second return spring, wherein the middle portion of the first shift plate is rotatably arranged in the housing, and one end of the first shift plate can be rotated to a path where the inclined tongue retracts into the housing under the action of the second return spring and limits the movement of the inclined tongue; The square tongue assembly also includes a second shift plate, which is arranged on a side of the square tongue plate away from the locking plate, the middle part of which is rotatably connected to the square tongue plate, one end of which abuts against the other end of the first shift plate, and the other end of which is arranged at the rotation track of the end of the shift nut; wherein When the peach rotates, the second shift plate can be shifted to rotate, and then the first shift plate can be driven to rotate, so that one end of the first shift plate releases the limit on the inclined tongue.

7. The lock with a tongue assembly according to claim 6, characterized in that: A rotating shaft is passed through the square tongue plate, and two ends of the rotating shaft are inserted into rotating shaft grooves respectively arranged on the locking plate and the second shifting plate.

8. The lock with a tongue assembly according to claim 7, characterized in that: The first return spring is a double torsion spring structure, which is sleeved on the rotating shaft, with one end torsion arm abutting against the locking plate, the other end torsion arm abutting against the second shifting plate, and the middle torsion arm straddling the square tongue plate.

9. The lock with a tongue assembly according to claim 8, characterized in that: The second shifting plate is further provided with a third limiting portion, and the third limiting portion abuts against a side of the square tongue plate away from the shifting peach.

10. The lock having a tongue assembly according to claim 6, characterized in that: The square tongue plate is provided with a second shifting groove, and one end of the second shifting plate close to the shifting peach covers the second shifting groove.

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