Mechanical lock body with all-gear transmission

Abstract

The utility model discloses a mechanical lock body of full gear transmission mechanism, including bottom shell and face shell through the fixed screw rod, be provided with inclined bolt and big force board bolt tongue between bottom shell and face shell, be provided with lock core mounting hole position on bottom shell, be provided with drive gear on the edge of lock core mounting hole position, be provided with transmission gear structure and square shaft connecting piece on bottom shell, the wheel surface edge of transmission gear structure is fixed with the abutment column, be rotatablely connected with the bolt tongue linkage spare on square shaft connecting piece, transmission gear structure and drive gear are engaged, be provided with round recess on big force board bolt tongue, the bottom of transmission gear structure is fixed with the eccentric boss axle of the size cooperation with round recess, the utility model discloses the structure is reasonably arranged, has promoted the use stability and reliability, the translation of big force board bolt tongue drives first day and night hook spare and second day and night hook spare to realize day and night position unlocking or locking action, and the whole structure is simple, is favorable for reducing the processing cost, and the use is stable and reliable, is favorable for promoting the use safety strong.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical lock technology, specifically relating to a mechanical lock body with an all-gear transmission mechanism. Background Technology

[0002] Mechanical locks are a common type of lock structure, generally consisting of a lock body, a lock cylinder, and a deadbolt mechanism, as shown in CN202020695758.2. Although they can meet general usage needs, their complex structure greatly increases usage costs and affects operational stability, making it difficult to meet market demands. Utility Model Content

[0003] The purpose of this utility model is to provide a mechanical lock body with a fully geared transmission mechanism that has a reasonable structural design and is stable and reliable in use.

[0004] The technical solution to achieve the purpose of this utility model is a mechanical lock body with a full gear transmission mechanism, including a bottom shell and a top shell fixed by a screw. A slanted locking tongue and a high-strength locking tongue are provided between the bottom shell and the top shell. A lock cylinder mounting hole is provided on the bottom shell. A drive gear connected to the lock cylinder is provided at the edge of the lock cylinder mounting hole. A transmission gear structure and a square shaft connector are provided on the bottom shell. A stop post is fixed at the edge of the wheel surface of the transmission gear structure.

[0005] A slanted tongue linkage is rotatably connected to the square shaft connector. The transmission gear structure meshes with the drive gear. One end of the slanted tongue linkage abuts against the side of the abutment post, and the other end of the slanted tongue linkage is connected to the locking rod of the slanted locking tongue.

[0006] The bolt of the high-pressure plate is provided with a circular groove, and the bottom surface of the transmission gear structure is fixed with an eccentric convex shaft that matches the size of the circular groove. The eccentric convex shaft is located in the circular groove.

[0007] The lock cylinder drives the drive gear to rotate, and the rotation of the transmission gear structure causes the eccentric cam shaft to drive the bolt of the heavy plate to move horizontally to complete the unlocking or locking action. At the same time, the transmission gear structure drives the inclined bolt linkage to rotate, and the end of the inclined bolt linkage drives the inclined bolt to move horizontally to complete the unlocking or locking action.

[0008] A further preferred embodiment is that the bottom shell is provided with a first ground hook, a second ground hook, and a connecting gear;

[0009] The first top and bottom hooks are provided with a horizontal guide groove, and the second top and bottom hooks are provided with a horizontal strip groove and an inclined strip groove;

[0010] The horizontal guide groove is parallel to the horizontal strip groove;

[0011] Two guide protrusions are fixed on the bottom shell, and a guide rod is fixed on the bolt of the high-strength plate lock tongue;

[0012] Both the top edge of the first and second bottom edges of the hook are provided with strip-shaped toothed grooves.

[0013] The connecting gear is located between the first ground hook and the second ground hook. The strip tooth groove of the first ground hook meshes with the lower edge of the connecting gear, and the strip tooth groove of the second ground hook meshes with the upper edge of the connecting gear.

[0014] The two guide protrusions are respectively located in the horizontal guide groove and the horizontal strip groove, and the guide post rod is located in the inclined strip groove;

[0015] When the bolt of the high-pressure plate moves horizontally, the guide rod moves synchronously in the inclined strip groove, causing the first ground hook and the second ground hook to move in opposite directions. The first ground hook and the second ground hook then simultaneously perform the unlocking or locking action.

[0016] A further preferred embodiment is that: a deadbolt is provided between the bottom shell and the top shell, a deadbolt knob is provided on the bottom shell, and a deadbolt protrusion is provided on the side wall of the deadbolt knob;

[0017] The side wall of the deadbolt is provided with a C-shaped deadbolt groove that matches the width of the deadbolt protrusion. The deadbolt protrusion is located in the C-shaped deadbolt groove. When the deadbolt knob is rotated, the deadbolt protrusion drives the deadbolt to move horizontally.

[0018] A further preferred embodiment is that the drive gear is an arc-shaped gear;

[0019] An arc-shaped guide groove is provided along the edge of the lock cylinder mounting hole, and a limit block is fixed on the bottom surface of the face shell, with a C-shaped guide groove provided on the limit block.

[0020] Both the top and bottom surfaces of the arc-shaped gear are fixed with arc-shaped guide ridges;

[0021] The two arc-shaped guide protrusions of the arc gear are respectively movably disposed in the arc-shaped guide groove and the C-shaped guide groove.

[0022] A further preferred embodiment is that the transmission gear structure includes a chassis, a shaft, a middle half-gear component, a top gear, and a support column;

[0023] The shaft is connected at the middle position of the chassis, the middle half gear and the top gear, and the middle half gear is fixed to the chassis by a pin.

[0024] The eccentric cam shaft is fixed at the bottom edge of the chassis, and the support column is fixed at the top surface of the middle half gear component.

[0025] The top gear is provided with an arc-shaped clearance groove, and the wheel surface of the top gear is fixed with protrusions;

[0026] The support column is movably disposed within the arc-shaped clearance groove, and a torsion spring is sleeved on the shaft, with both ends of the torsion spring fixed to the support column and the protrusion, respectively.

[0027] A further preferred embodiment is that the bolt of the high-strength plate is provided with a strip-shaped clearance groove;

[0028] The shaft is located within the strip-shaped clearance groove.

[0029] A further preferred embodiment is that a linkage gear is fixed on the square shaft connector, and the linkage gear meshes with the middle half gear component.

[0030] A further preferred embodiment is that the oblique tongue linkage is provided with an arc-shaped groove;

[0031] The square shaft connector is fixed with a buckling protrusion.

[0032] The buckling protrusion is located within the arc-shaped groove.

[0033] A further preferred embodiment is that the bottom shell and the top shell are provided with a reversing actuation groove perpendicular to the extension and retraction direction of the oblique tongue;

[0034] The bottom shell is provided with a reversing lever, and the top and bottom of the reversing lever are both located in the reversing lever groove.

[0035] Furthermore, when the reversing lever moves horizontally, it is either locked into the tail of the inclined tongue shaft or disengaged from the tail of the inclined tongue shaft.

[0036] This utility model has positive effects: Its structure is rationally designed, incorporating a drive gear, a transmission gear structure, a square shaft connector, a slanted tongue linkage, and a circular groove and eccentric convex shaft on the large-plate locking tongue. During use, the drive gear, through the transmission gear structure and in conjunction with the slanted tongue linkage and eccentric convex shaft, enables the large-plate locking tongue and slanted locking tongue to lock or unlock synchronously, improving stability and reliability. Furthermore, it includes a first ground hook, a second ground hook, a connecting gear, and an inclined strip groove on the second ground hook in conjunction with a guide rod. Simultaneously, the drive gear, through the translation of the large-plate locking tongue, drives the first ground hook and the second ground hook to achieve locking or unlocking at the ground position. The overall structure is simple, reducing processing costs, and the stable and reliable operation enhances safety and versatility. Attached Figure Description

[0037] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein:

[0038] Figure 1 This is a schematic diagram of the structure of this utility model;

[0039] Figure 2 This is a schematic diagram of the structure of the front cover of this utility model when it is opened;

[0040] Figure 3 This is a schematic diagram showing the bottom shell and top shell of this utility model open and the transmission gear structure bursting open.

[0041] Figure 4 for Figure 3 Enlarged structural diagram at point A in the middle.

[0042] Reference numerals: 1. Bottom shell; 2. Front shell; 3. Slanted latch; 4. Heavy-duty latch; 5. Lock cylinder mounting hole; 6. Drive gear; 7. Transmission gear structure; 7. Chassis; 71. Shaft; 72. Middle half-gear component; 73. Top gear; 74. Support column; 75. Square shaft connector; 8. Abutment column; 9. Slanted latch linkage component; 10. Circular groove; 11. Eccentric convex shaft; 12. First ground hook component; 13. Second ground hook component; 14. Connecting gear; 15. Horizontal guide groove; 16. Horizontal strip groove; 17. Inclined strip groove 18, guide protrusion 19, strip toothed groove 20, deadbolt 21, deadbolt knob 22, deadbolt protrusion 23, C-shaped deadbolt groove 24, arc-shaped guide groove 25, limit block 26, C-shaped guide groove 27, arc-shaped guide protrusion 28, arc-shaped clearance groove 29, protrusion 30, torsion spring 31, strip clearance groove 32, linkage gear 33, arc-shaped groove 34, latching protrusion 35, guide post 36, reversing toggle strip groove 37, reversing toggle piece 38. Detailed Implementation

[0043] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0044] Example

[0045] See Figures 1 to 4As shown, a mechanical lock body with a full gear transmission mechanism includes a bottom shell 1 and a top shell 2 fixed by a screw. A slanted locking tongue 3 and a high-pressure locking tongue 4 are provided between the bottom shell and the top shell. A lock cylinder mounting hole 5 is provided on the bottom shell. A drive gear 6 connected to the lock cylinder is provided at the edge of the lock cylinder mounting hole. A transmission gear structure 7 and a square shaft connector 8 are provided on the bottom shell. A stop post 9 is fixed to the edge of the wheel surface of the transmission gear structure. In this embodiment, the bottom shell and the top shell are conventional structures of the prior art, and are simply applied. At the same time, the slanted locking tongue and the high-pressure locking tongue are also conventional structures of the prior art, so they are not described in detail. The square shaft connector is used to connect the square shaft. The drive gear rotates synchronously when the lock cylinder moves and cooperates with the transmission gear structure to realize the unlocking or locking action.

[0046] In this embodiment, a slanted tongue linkage 10 is rotatably connected to the square shaft connector. The transmission gear structure meshes with the drive gear. One end of the slanted tongue linkage abuts against the side of the abutment post, and the other end of the slanted tongue linkage is connected to the locking rod of the slanted locking tongue. The slanted tongue linkage is mainly used to realize the synchronous drive of the slanted locking tongue.

[0047] Furthermore, the bolt lock tongue is provided with a circular groove 11, and the bottom surface of the transmission gear structure is fixed with an eccentric convex shaft 12 that matches the size of the circular groove. The eccentric convex shaft is located in the circular groove. In use, the lock cylinder drives the drive gear to rotate, and the rotation of the transmission gear structure causes the eccentric convex shaft to drive the bolt lock tongue to move horizontally to complete the unlocking or locking action. At the same time, the transmission gear structure drives the oblique tongue linkage to rotate, and the end of the oblique tongue linkage drives the oblique lock tongue to move horizontally to complete the unlocking or locking action.

[0048] In practical application, the bottom shell is provided with a first ground hook 13, a second ground hook 14, and a connecting gear 15; the first ground hook is provided with a horizontal guide groove 16, and the second ground hook is provided with a horizontal strip groove 17 and an inclined strip groove 18; the horizontal guide groove is parallel to the horizontal strip groove; two guide protrusions 19 are fixed on the bottom shell, and a guide rod 36 is fixed on the bolt latch; the horizontal strip groove and the horizontal guide groove are mainly used for the translational guidance of the first ground hook and the second ground hook, while the inclined strip groove drives the second ground hook to translate synchronously through the guide rod when the bolt latch translates, and the connecting gear makes the first ground hook move synchronously in opposite directions;

[0049] Furthermore, both the top edge of the first and second ground hooks are provided with strip-shaped toothed grooves 20; during assembly, the connecting gear is positioned between the first and second ground hooks, the strip-shaped toothed groove of the first ground hook meshes with the lower edge of the connecting gear, and the strip-shaped toothed groove of the second ground hook meshes with the upper edge of the connecting gear; the two guide protrusions are respectively located in the horizontal guide groove and the horizontal strip-shaped groove, and the guide post is located in the inclined strip-shaped groove; when the bolt tongue of the high-pressure plate moves horizontally, the guide post moves synchronously in the inclined strip-shaped groove, causing the first and second ground hooks to move in opposite directions, and the first and second ground hooks simultaneously achieve the unlocking or locking action.

[0050] In this embodiment, a deadbolt 21 is provided between the bottom shell and the top shell, and a deadbolt knob 22 is provided on the bottom shell. A deadbolt protrusion 23 is provided on the side wall of the deadbolt. A C-shaped deadbolt groove 24, matching the width of the deadbolt protrusion, is provided on the side wall of the deadbolt. The deadbolt protrusion is disposed within the C-shaped deadbolt groove. When the deadbolt knob is rotated, the deadbolt causes the deadbolt to move horizontally. This achieves a deadbolt action, improving safety during use.

[0051] In this embodiment, the driving gear is an arc-shaped gear; an arc-shaped guide groove 25 is provided along the edge of the lock cylinder mounting hole; a limiting block 26 is fixed to the bottom surface of the face shell, and a C-shaped guide groove 27 is provided on the limiting block; arc-shaped guide protrusions 28 are fixed to both the top and bottom surfaces of the arc-shaped gear; wherein the length of the arc-shaped guide protrusion is less than the length of the C-shaped guide groove of the arc-shaped guide groove, which can guide and limit the arc-shaped guide protrusion. During assembly, the two arc-shaped guide protrusions of the arc-shaped gear are respectively movably disposed in the arc-shaped guide groove and the C-shaped guide groove.

[0052] In this embodiment, the transmission gear structure includes a chassis 71, a shaft 72, a middle half-gear component 73, a top gear 74, and a support column 75. During assembly, the shaft is connected to the middle position of the chassis, the middle half-gear component, and the top gear. The middle half-gear component is fixed to the chassis by a pin. The eccentric cam is fixed at the bottom edge of the chassis, and the support column is fixed to the top surface of the middle half-gear component. The top gear is provided with an arc-shaped clearance groove 29, and a protrusion 30 is fixed on the wheel surface of the top gear. The support column is movably disposed in the arc-shaped clearance groove, and a torsion spring 31 is sleeved on the shaft, with both ends of the torsion spring fixed to the support column and the protrusion, respectively.

[0053] Meanwhile, to ensure stable operation, a strip-shaped clearance groove 32 is provided on the bolt latch; the shaft is located within the strip-shaped clearance groove. A linkage gear 33 is fixed on the square shaft connector, and the linkage gear meshes with the middle half gear component. An arc-shaped groove 34 is provided on the oblique latch linkage component; a locking protrusion 35 is fixed on the square shaft connector; the locking protrusion is located within the arc-shaped groove. The linkage gear, in conjunction with the middle half gear component, the arc-shaped groove, and the locking protrusion, ensures that after the top gear rotates at a certain angle, when the locking protrusion is located on the end wall of the arc-shaped groove, the continuous rotation of the top gear is necessary to drive the oblique latch linkage component to operate, enabling the oblique latch to complete the unlocking or locking operation.

[0054] like Figure 2 As shown, during use, when the drive gear rotates counterclockwise, it drives the transmission gear structure to rotate clockwise, and at the same time, it causes the bolt of the heavy plate to move forward. When moving forward, the guide rod moves downward in the inclined strip groove, which will drive the first and second ground hook parts to move outward in opposite directions, completing one locking movement.

[0055] exist Figure 2 In the lock's operation, when the drive gear rotates clockwise, it drives the transmission gear structure to rotate counterclockwise. Simultaneously, this causes the bolt to move backward. During this backward movement, the guide rod moves downward within the inclined slot, causing the first and second ground hook components to simultaneously shift inward, completing one unlocking cycle. At this point, the transmission gear structure continues to rotate, driving the latch linkage component to rotate. This causes the end of the latch linkage component to retract the latch into the bottom housing, fully opening the lock body and completing one unlocking operation.

[0056] exist Figure 2 In the middle, when the oblique tongue linkage moves counterclockwise, the linkage gear below the oblique tongue linkage and the middle half gear in the transmission gear structure rotate in a circle, causing the transmission gear structure to drive the heavy plate locking tongue to move forward, and at the same time drive the first ground hook and the second ground hook to move outward in opposite directions, completing one locking movement.

[0057] exist Figure 2 In the process, when the inclined tongue linkage moves clockwise, the linkage gear below the inclined tongue linkage and the middle half gear in the transmission gear structure rotate in a circle, causing the transmission gear structure to drive the heavy plate lock tongue to move backward, and at the same time drive the first and second ground hook parts to move inward in opposite directions, completing one unlocking movement.

[0058] In this embodiment, the bottom shell and the top shell are provided with a reversing actuation slot 37 perpendicular to the extension and retraction direction of the oblique tongue; a reversing actuation piece 38 is provided inside the bottom shell, and the top and bottom of the reversing actuation piece are both located in the reversing actuation slot; and when the reversing actuation piece moves horizontally, it is either locked into the tail of the oblique tongue shaft or disengaged from the tail of the oblique tongue shaft. During use, the reversing lever is engaged with the tail of the latch rod to limit its extension and retraction. At this time, the latch's extension and retraction length is limited by the reversing lever, and the latch cannot disengage from the lock frame, allowing for normal locking and unlocking operations. When the reversing lever is moved outward away from the tail of the latch rod, the latch's outward extension length is no longer limited by the reversing lever, allowing the latch to extend outward, fully extending the latch head out of the lock frame and rotating 180 degrees. After being released, the latch retracts inward to reset under the action of the spring. Then, the reversing lever is engaged with the tail of the latch rod to limit its movement. Through the above structure, the reversing and limiting operations of the latch can be realized, meeting the needs of different usage situations.

[0059] This utility model has positive effects: Its structure is rationally designed, incorporating a drive gear, a transmission gear structure, a square shaft connector, a slanted tongue linkage, and a circular groove and eccentric convex shaft on the large-plate locking tongue. During use, the drive gear, through the transmission gear structure and in conjunction with the slanted tongue linkage and eccentric convex shaft, enables the large-plate locking tongue and slanted locking tongue to lock or unlock synchronously, improving stability and reliability. Furthermore, it includes a first ground hook, a second ground hook, a connecting gear, and an inclined strip groove on the second ground hook in conjunction with a guide rod. Simultaneously, the drive gear, through the translation of the large-plate locking tongue, drives the first ground hook and the second ground hook to achieve locking or unlocking at the ground position. The overall structure is simple, reducing processing costs, and the stable and reliable operation enhances safety and versatility.

[0060] The standard parts used in this embodiment can be purchased directly from the market, and the non-standard structural parts described in the instruction manual can also be processed without any doubt based on existing technical common sense. At the same time, the connection methods of each component adopt mature conventional methods in the existing technology, and the machinery, parts and equipment all adopt conventional models in the existing technology, so they will not be described in detail here.

[0061] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all embodiments here. However, these obvious variations or modifications derived from the essential spirit of this utility model still fall within the protection scope of this utility model.

Claims

1. A mechanical lock body for a full gear transmission mechanism, comprising a bottom shell and a top shell fixed by a screw, wherein a slanted locking tongue and a high-strength locking tongue are provided between the bottom shell and the top shell, characterized in that: The bottom shell is provided with a lock cylinder mounting hole, and a drive gear connected to the lock cylinder is provided at the edge of the lock cylinder mounting hole. The bottom shell is provided with a transmission gear structure and a square shaft connector, and a stop post is fixed to the edge of the wheel surface of the transmission gear structure. A slanted tongue linkage is rotatably connected to the square shaft connector. The transmission gear structure meshes with the drive gear. One end of the slanted tongue linkage abuts against the side of the abutment post, and the other end of the slanted tongue linkage is connected to the locking rod of the slanted locking tongue. The bolt of the high-pressure plate is provided with a circular groove, and the bottom surface of the transmission gear structure is fixed with an eccentric convex shaft that matches the size of the circular groove. The eccentric convex shaft is located in the circular groove. The lock cylinder drives the drive gear to rotate, and the rotation of the transmission gear structure causes the eccentric cam shaft to drive the bolt of the heavy plate to move horizontally to complete the unlocking or locking action. At the same time, the transmission gear structure drives the inclined bolt linkage to rotate, and the end of the inclined bolt linkage drives the inclined bolt to move horizontally to complete the unlocking or locking action.

2. The mechanical lock body of a full gear transmission mechanism according to claim 1, characterized in that: The bottom shell is provided with a first ground hook, a second ground hook and a connecting gear; The first top and bottom hooks are provided with a horizontal guide groove, and the second top and bottom hooks are provided with a horizontal strip groove and an inclined strip groove; The horizontal guide groove is parallel to the horizontal strip groove; Two guide protrusions are fixed on the bottom shell, and a guide rod is fixed on the bolt of the high-strength plate lock tongue; Both the top edge of the first and second bottom edges of the hook are provided with strip-shaped toothed grooves. The connecting gear is located between the first ground hook and the second ground hook. The strip tooth groove of the first ground hook meshes with the lower edge of the connecting gear, and the strip tooth groove of the second ground hook meshes with the upper edge of the connecting gear. The two guide protrusions are respectively located in the horizontal guide groove and the horizontal strip groove, and the guide post rod is located in the inclined strip groove; When the bolt of the high-pressure plate moves horizontally, the guide rod moves synchronously in the inclined strip groove, causing the first ground hook and the second ground hook to move in opposite directions. The first ground hook and the second ground hook then simultaneously perform the unlocking or locking action.

3. The mechanical lock body of the all-gear transmission mechanism according to claim 2, characterized in that: A deadbolt is provided between the bottom shell and the top shell, a deadbolt knob is provided on the bottom shell, and a deadbolt protrusion is provided on the side wall of the deadbolt knob; The side wall of the deadbolt is provided with a C-shaped deadbolt groove that matches the width of the deadbolt protrusion. The deadbolt protrusion is located in the C-shaped deadbolt groove. When the deadbolt knob is rotated, the deadbolt protrusion drives the deadbolt to move horizontally.

4. The mechanical lock body of a full gear transmission mechanism according to claim 1, characterized in that: The drive gear is an arc gear; An arc-shaped guide groove is provided along the edge of the lock cylinder mounting hole, and a limit block is fixed on the bottom surface of the face shell, with a C-shaped guide groove provided on the limit block. Both the top and bottom surfaces of the arc-shaped gear are fixed with arc-shaped guide ridges; The two arc-shaped guide protrusions of the arc gear are respectively movably disposed in the arc-shaped guide groove and the C-shaped guide groove.

5. The mechanical lock body of a full gear transmission mechanism according to claim 1, characterized in that: The transmission gear structure includes a chassis, a shaft, a middle half-gear component, a top gear, and a support column; The shaft is connected at the middle position of the chassis, the middle half gear and the top gear, and the middle half gear is fixed to the chassis by a pin. The eccentric cam shaft is fixed at the bottom edge of the chassis, and the support column is fixed at the top surface of the middle half gear component. The top gear is provided with an arc-shaped clearance groove, and the wheel surface of the top gear is fixed with protrusions; The support column is movably disposed within the arc-shaped clearance groove, and a torsion spring is sleeved on the shaft, with both ends of the torsion spring fixed to the support column and the protrusion, respectively.

6. The mechanical lock body of a full gear transmission mechanism according to claim 5, characterized in that: The bolt of the high-strength plate is provided with a strip-shaped clearance groove; The shaft is located within the strip-shaped clearance groove.

7. The mechanical lock body of a full gear transmission mechanism according to claim 5, characterized in that: A linkage gear is fixed on the square shaft connector, and the linkage gear meshes with the middle half gear component.

8. The mechanical lock body of a full gear transmission mechanism according to claim 7, characterized in that: The oblique tongue linkage component is provided with an arc-shaped groove; The square shaft connector is fixed with a buckling protrusion. The buckling protrusion is located within the arc-shaped groove.

9. The mechanical lock body of a full gear transmission mechanism according to claim 7, characterized in that: The bottom shell and the top shell are provided with reversing actuation slots perpendicular to the extension and retraction direction of the oblique tongue; The bottom shell is provided with a reversing lever, and the top and bottom of the reversing lever are both located in the reversing lever groove. Furthermore, when the reversing lever moves horizontally, it is either locked into the tail of the inclined tongue shaft or disengaged from the tail of the inclined tongue shaft.

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