Improved magnetic lock

Abstract

The utility model discloses an improved magnetic lock which comprises a spring bolt box and a lock box, the spring bolt box is provided with a spring bolt body, the outer end of the spring bolt body stretches out and draws back to enter and exit one side of the spring bolt box, a first magnet is arranged in the spring bolt body, and at least two magnetic areas with opposite magnetic poles are arranged on one side, facing the lock box, of the first magnet in the width direction. A lock groove is formed in the side, facing the lock tongue box, of the lock box, a second magnet is arranged in the lock box, at least two magnetic areas with opposite magnetic poles are arranged on the side, facing the lock tongue box, of the second magnet in the width direction, the lock tongue body is close to the lock box, and the magnetic poles of the magnetic areas where the first magnet and the second magnet coincide are the same, so that the lock tongue body does not enter the lock groove. And the spring bolt body enters the lock groove until the magnetic poles of the overlapped magnetic areas of the first magnet and the second magnet are different. When the spring bolt body gets close to the lock groove, the spring bolt body is prevented from stretching out too early due to the fact that the magnetic poles are the same and repel each other, after the spring bolt body and the lock groove coincide to the preset range, the magnetic poles of the first magnet and the second magnet are different, the spring bolt body stretches into the lock groove through magnetic attraction, and the magnetic attraction effect is better.

Description

Technical Field

[0001] The utility model relates to the technical field of magnetic locks, in particular to an improved magnetic lock. Background Art

[0002] The existing magnetic lock includes a lock tongue and a driving mechanism for driving the lock tongue to extend and retract. For example, the applicant disclosed a magnetic lock in the prior patent CN219012240U, in which the lock tongue is extended by a magnet in a lock box in the door frame. During use, the lock tongue approaches the lock box of the door frame but is not aligned with the lock slot of the lock box. The lock tongue is sucked out under the action of the magnetic force, that is, the lock tongue moves toward the lock box, so that the lock tongue and the lock box collide and produce abnormal noise.

[0003] Moreover, the lock tongue is linked to the driving mechanism during the extension and retraction process, and the lock tongue will also drive the driving mechanism to perform corresponding actions, which causes the driving mechanism to malfunction easily during the extension process, that is, the locking process, and thus the lock tongue cannot be sucked out by the magnet. Utility Model Content

[0004] The utility model aims to provide an improved magnetic lock which can reduce abnormal noise.

[0005] The purpose of the utility model is achieved in this way.

[0006] An improved magnetic lock comprises a bolt box and a lock box.

[0007] The bolt box is installed on the door body, and a bolt body is arranged inside the bolt box. The outer end of the bolt body is telescopic to enter and exit one side of the bolt box. A first magnet is arranged inside the bolt body. The first magnet is provided with at least two magnetic regions with opposite magnetic poles along the width direction toward one side of the lock box.

[0008] The lock box is installed on the door frame, and a lock groove is provided on the side of the lock box facing the lock tongue box. A second magnet is provided in the lock box, and at least two magnetic regions with opposite magnetic poles are provided on the side of the second magnet facing the lock tongue box along the width direction. The lock tongue body is close to the lock box, and the magnetic poles of the magnetic regions where the first magnet and the second magnet overlap are the same so that the lock tongue body does not enter the lock groove, until the magnetic poles of the magnetic regions where the first magnet and the second magnet overlap are different, and the lock tongue body enters the lock groove.

[0009] According to the utility model, when the lock tongue body approaches the lock slot, they repel each other due to the same magnetic poles, thereby preventing the lock tongue body from extending prematurely; when the lock tongue body and the lock slot overlap to a preset range, the magnetic poles of the first magnet and the second magnet are different, and the lock tongue body is extended into the lock slot through magnetic attraction, thereby achieving a better magnetic attraction effect.

[0010] The above technical solution can be further improved as follows.

[0011] In a more specific solution, the first magnet is provided with a first magnetic region, a second magnetic region and a third magnetic region, the second magnetic region is located between the first magnetic region and the third magnetic region, and the magnetic poles of the first magnetic region and the third magnetic region are opposite to the magnetic poles of the second magnetic region.

[0012] The second magnet is provided with a fourth magnetic region, a fifth magnetic region and a sixth magnetic region along the width direction on the side facing the bolt box, the fifth magnetic region is located between the fourth magnetic region and the sixth magnetic region, and the magnetic poles of the fourth magnetic region and the sixth magnetic region are opposite to the magnetic poles of the fifth magnetic region.

[0013] The magnetic poles of the second magnetic region and the fifth magnetic region are the same, and the magnetic poles of the first magnetic region, the third magnetic region, the fourth magnetic region and the sixth magnetic region are the same.

[0014] No need to consider the direction of the switch lock tongue body entering the lock slot, fool-proof design, easy installation of magnetic lock.

[0015] In a more specific solution, the width of the first magnet is the same as the width of the second magnet, the width of the second magnetic zone is the same as the width of the fifth magnetic zone, and the width of the first magnetic zone, the third magnetic zone, the fourth magnetic zone and the sixth magnetic zone are the same, thereby improving the magnetic attraction between the lock body and the lock box to be more secure.

[0016] In a more specific solution, the first magnet is integrally formed, and the first magnet is magnetized to form the first magnetic region, the second magnetic region and the third magnetic region. The first magnet is easy to install.

[0017] In a more specific solution, the second magnet is integrally formed, and the first magnet is magnetized to form the fourth magnetic region, the fifth magnetic region and the sixth magnetic region. The second magnet is easy to install.

[0018] In a more specific solution, a fixing frame and a shielding gasket are provided in the lock box, the fixing frame is provided with a groove, the lock box is provided with a hollow portion corresponding to the groove, the second magnet is fixed to the back of the fixing frame by a snap connection, the second magnet is placed in the bottom area of ​​the groove, the shielding gasket is placed in the groove, and the shielding gasket and the groove constitute the lock groove. The shielding gasket buffers the impact of the lock tongue body on the lock box and reduces noise generation.

[0019] In a more specific solution, a first step hole is formed on the outer end surface of the bolt body, a shielding cover is arranged in the first step hole, a first magnet is placed in the first step hole and connected and fixed to the bolt body, and the shielding cover shields the magnet. The first magnet is easy to install, and the shielding cover has decorative and wear-resistant functions.

[0020] In a more specific embodiment, the height of the second magnet is greater than the height of the first magnet.

[0021] In a more specific embodiment, the height of the second magnet is twice the height of the first magnet.

[0022] More specifically, the bolt box also includes

[0023] A rotary transmission device located in the lock tongue box and driven by the lock cylinder.

[0024] The transmission member is movably arranged in the lock tongue box along the extension direction of the lock tongue body, and the transmission member and the inner end of the lock tongue body are linked with each other in a virtual position.

[0025] The first elastic member, the elastic force of the first elastic member makes the bolt body tend to move into the bolt box, and the transmission member tends to move out of the bolt box.

[0026] A second elastic member, one end of which is connected to the bolt box, and the other end of which is connected to the transmission member. The elastic force of the second elastic member causes the transmission member to move toward the bolt body.

[0027] When the lock tongue body overcomes the elastic force of the second elastic member and extends out of the lock tongue box, the virtual position of the lock tongue body and the transmission member is eliminated, the rotary transmission device rotates to drive the transmission member to move into the lock tongue box, and the transmission member drives the lock tongue body to retract into the lock tongue box. When the lock tongue body is extended, it will not drive the transmission member and the rotary transmission device to move. After the lock tongue body is extended, the transmission member can directly drive the lock tongue body to retract, and the overall structure operates stably and reliably.

[0028] The beneficial effects of the utility model are as follows.

[0029] (1) In the utility model, when the lock tongue body is close to the lock slot, the same magnetic poles repel each other, thereby preventing the lock tongue body from extending prematurely. When the lock tongue body is aligned with the lock slot, the magnetic poles of the first magnet and the second magnet are different, and the lock tongue body extends into the lock slot, resulting in a better magnetic attraction effect.

[0030] (2) Secondly, the first magnet and the second magnet are integrally formed, which reduces the difficulty of installation. The shielding gasket cushions the impact of the lock tongue body on the lock box and reduces noise. The shielding cover has decorative and wear-resistant functions.

[0031] (3) Furthermore, when the lock tongue body is extended, the transmission member and the rotary transmission device will not be driven to move. Only after the lock tongue body is extended can the transmission member directly drive the lock tongue body to retract, and the overall structure operates stably and reliably. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural diagram of embodiment 1.

[0033] Figure 2 It is a structural schematic diagram of embodiment 1 (from another perspective).

[0034] Figure 3 This is a schematic diagram of the decomposed structure of Example 1.

[0035] Figure 4 Schematic diagram of the magnetic pole of the first magnet facing the lock box in Example 1.

[0036] Figure 5Schematic diagram of the magnetic pole of the second magnet facing the bolt box in Example 1.

[0037] Figure 6 It is a schematic cross-sectional structure diagram of the first embodiment (the lock tongue body is in a retracted state).

[0038] Figure 7 It is a schematic cross-sectional structure diagram of the first embodiment (the lock tongue body is in an extended state).

[0039] Figure 8 It is a schematic diagram of the cross-sectional structure of the first embodiment (the retraction of the transmission member drives the lock tongue body to retract). DETAILED DESCRIPTION

[0040] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0041] Example 1, see Figure 1-8 As shown, an improved magnetic lock comprises a bolt box 1 installed on a door body and a lock box 9 installed on a door frame.

[0042] The bolt box comprises a rotation transmission device 2 which is arranged in the bolt box 1 and is driven by a lock core, a bolt body 3, a transmission member 4, a first elastic member 5 and a second elastic member 6.

[0043] The bolt box 1 comprises a box body 11 and a cover 12. The box body 11 is provided with an opening 13 on one side away from the bolt body 3. The cover 12 covers the opening 13. The cover 12 and the box body 11 are connected and fixed by screws. The rotary transmission device 2, the bolt body 3, the transmission member 4, the first elastic member 5 and the second elastic member 6 are all arranged in the box body 11.

[0044] The outer end of the lock tongue body 3 is telescoped to one side of the lock tongue box 1, and the inner end of the lock tongue body 3 is provided with a waist-shaped hole 30 that penetrates the lock tongue body 3. A mounting hole 31 is provided in the lock tongue body 3 along its telescopic direction, and the mounting hole 31 is connected to the waist-shaped hole 30. The mounting hole 31 is a countersunk hole, and the opening of the mounting hole 31 is arranged on the outer end surface of the lock tongue body 3, and a first step hole 32 is formed near the opening of the mounting hole 31. The first elastic member 5 is placed on the bottom surface of the mounting hole 31 through the first step hole 32, and the first magnet 7 and the shielding cover 35 are installed in the first step hole 32, and the shielding cover 35 shields the first magnet 7. A guide groove 36 is provided on the outer side of the inner end of the lock tongue body 3 corresponding to the waist-shaped hole 30. Preferably, the shielding cover 35 is usually adhered to the first magnet 7, and the first magnet 7 and the lock tongue body 3 are screwed and fixed.

[0045] In this embodiment, the first magnet 7 is provided with a first magnetic region 71, a second magnetic region 72 and a third magnetic region 73 along the width direction on the side facing the lock box 9, the second magnetic region 72 is located between the first magnetic region 71 and the third magnetic region 73, and the magnetic poles of the first magnetic region 71 and the third magnetic region 73 are opposite to the magnetic poles of the second magnetic region 72. In this embodiment, the first magnet 7 is integrally formed, and the first magnet 7 is magnetized to form the first magnetic region 71, the second magnetic region 72 and the third magnetic region 73. Preferably, the first magnet 7 is integrally formed, and the first magnet 7 is magnetized to form the first magnetic region 71, the second magnetic region 72 and the third magnetic region 73, wherein the S pole of the second magnetic region 72 faces the lock box 9, and the N poles of the first magnetic region 71 and the third magnetic region 73 face the lock box 9.

[0046] The transmission member 4 is a U-shaped frame, and the transmission member 4 is limitedly arranged in the box body 11 and moves along the length direction of the box body 11, that is, the transmission member 4 moves along the telescopic direction of the lock tongue body 3. The outer ends of the transmission member 4 are respectively extended with support arms 41, and a round rod 42 is connected between the two support arms 41, that is, the round rods 42 at both ends are respectively connected and fixed with one arm 41, and a clearance gap 43 is provided between the two support arms 41. The round rod 42 passes through the waist-shaped hole 30, and the outer end of the first elastic member 5 abuts against the round rod 42, and the inner end of the first elastic member 5 abuts against the bottom surface of the mounting hole 31. The first elastic member 5 is a tower-shaped spring. The elastic force of the first elastic member 5 has a tendency to make the round rod 42 abut against the outer end side wall of the waist-shaped hole 30, that is, the elastic force of the first elastic member 5 makes the lock tongue body 3 have a tendency to move into the lock tongue box 1, and the transmission member 4 has a tendency to move out of the lock tongue box 1. The round rod 42 and the inner end of the waist-shaped hole 30 abut against each other to limit the extension length of the lock tongue body 3, and the round rod 42 and the outer end of the waist-shaped hole 30 abut against each other to limit the retraction length of the lock tongue body 3. The round rod 42 moves with the transmission member 4 in the waist-shaped hole 30 along the extension direction of the lock tongue body 3 to form a virtual position linkage between the transmission member 4 and the lock tongue body 3. The support arm 41 moves with the transmission member 4 in the guide groove 36.

[0047] A positioning column 44 is provided at the inner end of the transmission member 4, and the second elastic member 6 is a torsion spring. One end of the second elastic member 6 is sleeved on the screw connecting the cover body 12 and the box body 11, and the other end of the second elastic member 6 is sleeved on the positioning column 44. The elastic force of the second elastic member 6 makes the transmission member 4 tend to move toward the direction of the bolt body 3.

[0048] The rotary transmission device 2 is rotatably arranged in the bolt box 1 , and the rotary transmission device 2 rotates to drive the transmission member 4 to move.

[0049] The bolt box 1 of the utility model needs to be used in conjunction with the lock core and other components of the lock. The bolt box 1 is provided with a reserved hole 14. The connecting member (not shown in the figure) passes through the reserved hole 14 of the bolt box 1 and the yielding notch 43 of the transmission member 4 to fix the bolt box 1 on the door body. The connecting member is placed in the inner end of the bolt body 3, that is, the connecting member limits the inward retraction length of the bolt body 3.

[0050] Installed on the door frame, the lock box 9 is provided with a lock slot 90 on the side facing the bolt box 1, and a second magnet 8 is provided in the lock box 9. Specifically, a fixing frame 91 and a shielding gasket 92 are provided in the lock box 9, the fixing frame 91 is provided with a groove 93, and the lock box 9 is provided with a hollow part 94 corresponding to the groove 93, the second magnet 8 is fixed to the back of the fixing frame 91 through a snap connection, the second magnet 8 is placed in the bottom area of ​​the groove 93, the shielding gasket 92 is placed in the groove 93, and the shielding gasket 92 and the groove 93 constitute the lock slot 90.

[0051] The second magnet 8 is provided with a fourth magnetic region 81, a fifth magnetic region 82 and a sixth magnetic region 83 along the width direction on the side facing the bolt box 1, the fifth magnetic region 82 is located between the fourth magnetic region 81 and the sixth magnetic region 83, and the magnetic poles of the fourth magnetic region 81 and the sixth magnetic region 83 are opposite to the magnetic poles of the fifth magnetic region 82. Preferably, the second magnet 8 is integrally formed, and the first magnet 7 is magnetized to form the fourth magnetic region 81, the fifth magnetic region 82 and the sixth magnetic region 83.

[0052] In this embodiment, the second magnetic region 72 and the fifth magnetic region 82 have the same magnetic poles, and the first magnetic region 71, the third magnetic region 73, the fourth magnetic region 81 and the sixth magnetic region 83 have the same magnetic poles. That is, the S pole of the fifth magnetic region 82 faces the bolt body 3, and the N poles of the fourth magnetic region 81 and the sixth magnetic region 83 face the bolt body 3.

[0053] The normal state of the lock tongue, see Figure 6 . The second elastic member 6 pushes the transmission member 4 to move in the direction in which the lock tongue body 3 extends, that is, the round rod 42 of the transmission member 4 moves in the waist-shaped hole 30 until it abuts against the outer side wall of the waist-shaped hole 30. At the same time, the round rod 42 moves to the outer side wall of the waist-shaped hole 30, and the elastic force of the first elastic member 5 causes the lock tongue body 3 to retract into the lock tongue box 1. When the second elastic member 6 pushes the transmission member 4 to move to an appropriate distance in the direction in which the lock tongue body 3 extends, the elastic force of the second elastic member 6 is converted into a pulling force, which limits the transmission member 4 from continuing to move in the direction in which the lock tongue body 3 extends. At this time, the inner end of the lock tongue body 3 abuts against or is close to the connecting member. The moving distance of the round rod 42 in the waist-shaped hole 30 is the virtual distance that needs to be eliminated when the transmission member 4 drives the lock tongue body 3 to move.

[0054] The extended state of the lock tongue, i.e. the locked state, see Figure 7 When the magnetic force of the second magnet 8 of the lock box 9 and the magnetic attraction force of the first magnet 7 of the lock tongue body 3 are greater than the elastic force of the first elastic member 5, the lock tongue body 3 extends outward and compresses the first elastic member 5 until the round rod 42 of the transmission member 4 moves in the waist-shaped hole 30 to abut against the inner end side wall of the waist-shaped hole 30. At this time, the magnetic force of the door frame lock is less than the sum of the elastic forces of the first elastic member 5 and the second elastic member 6. The second elastic member 6 pulls the transmission member 4 and thus limits the extension length of the lock tongue body 3. In this way, during the locking process, the lock tongue body 3 moves, while the transmission member 4 hardly moves.

[0055] During the extension of the bolt body 3, according to the closing direction of the door, the first magnetic region 71 of the first magnet 7 and the sixth magnetic region 83 of the second magnet 8 overlap first, and the first magnetic region 71 and the sixth magnetic region 83 repel each other due to the same magnetic poles, so that the bolt body 3 will not extend directly to the lock slot 90. When the door body continues to move in the closing direction, until the first magnetic region 71 of the first magnet 7 and the fifth magnetic region 82 of the second magnet 8 overlap, the second magnetic region 72 of the first magnet 7 and the sixth magnetic region 83 of the second magnet 8 overlap, the first magnetic region 71 and the fifth magnetic region 82, the second magnetic region 72 and the sixth magnetic region 83 have magnetic attraction due to the different magnetic poles, so that the bolt body 3 is magnetically attracted into the lock slot 90.

[0056] Or the third magnetic region 73 and the fourth magnetic region 81 of the first magnet 7 overlap first, or the third magnetic region 73 and the fourth magnetic region 81 repel each other due to the same magnetic poles, so that the lock tongue body 3 will not directly extend into the lock slot 90. When the door body continues to move in the closing direction, until the third magnetic region 73 of the first magnet 7 and the fifth magnetic region 82 of the second magnet 8 overlap, the second magnetic region 72 of the first magnet 7 and the fourth magnetic region 81 of the second magnet 8 overlap, the third magnetic region 73 and the fifth magnetic region 82, the second magnetic region 72 and the fourth magnetic region 81 respectively have magnetic attraction due to their different magnetic poles, thereby magnetically attracting the lock tongue body 3 into the lock slot 90.

[0057] The retracted state of the lock tongue, that is, the unlocked state, see Figure 8 The door handle drives the rotary transmission device 2 to rotate, and then drives the transmission member 4 to move into the lock tongue box 1, that is, the transmission member 4 compresses the second elastic member 6, and the round rod 42 of the transmission member 4 abuts against the inner end side wall of the waist-shaped hole 30, thereby directly driving the lock tongue body 3 to retract inward, that is, the lock tongue body 3 overcomes the magnetic attraction of the second magnet 8 and retracts into the lock tongue box 1. When the lock tongue body 3 retracts to the inner end and abuts against the connecting member, the lock tongue body 3 and the transmission member 4 cannot continue to retract. In the above process, the first elastic member 5 is in a compressed state.

[0058] Then release the handle, the second elastic member 6 pushes the transmission member 4 to move outward to reset, and the round rod 42 moves from the inner end to the outer end side wall in the waist-shaped hole 30, that is, Figure 4 In the state shown, the elastic force of the first elastic member 5 causes the locking tongue body 3 to move inwards during the resetting process of the transmission member 4 , that is, the locking tongue body 3 remains stationary and the locking tongue body 3 retracts into the locking tongue box 1 .

Claims

1. An improved magnetic lock, comprising a bolt box (1) and a lock box (9), characterized in that: A bolt box (1) is mounted on a door body, wherein a bolt body (3) is arranged inside the bolt box, wherein the outer end of the bolt body (3) is telescopic so as to enter and exit one side of the bolt box (1), wherein a first magnet (7) is arranged inside the bolt body (3), and wherein the first magnet (7) is provided with at least two magnetic regions with opposite magnetic poles along a width direction on one side of the bolt box (9). A lock box (9) is mounted on a door frame. A lock slot (90) is provided on the side of the lock box (9) facing the lock tongue box (1). A second magnet (8) is provided in the lock box (9). The side of the second magnet (8) facing the lock tongue box (1) is provided with at least two magnetic regions with opposite magnetic poles along the width direction. When the lock tongue body is close to the lock box (9), the magnetic poles of the magnetic regions overlapped by the first magnet (7) and the second magnet (8) are the same, so that the lock tongue body does not enter the lock slot (90). Until the magnetic poles of the magnetic regions overlapped by the first magnet (7) and the second magnet (8) are different, the lock tongue body enters the lock slot (90).

2. The improved magnetic lock according to claim 1, characterized in that: The first magnet (7) is provided with a first magnetic region (71), a second magnetic region (72) and a third magnetic region (73); the second magnetic region (72) is located between the first magnetic region (71) and the third magnetic region (73); the magnetic poles of the first magnetic region (71) and the third magnetic region (73) are opposite to the magnetic poles of the second magnetic region (72); A fourth magnetic region (81), a fifth magnetic region (82) and a sixth magnetic region (83) are provided on the side of the second magnet (8) facing the bolt box (1) along the width direction, the fifth magnetic region (82) is located between the fourth magnetic region (81) and the sixth magnetic region (83), the magnetic poles of the fourth magnetic region (81) and the sixth magnetic region (83) are opposite to the magnetic pole of the fifth magnetic region (82), The magnetic poles of the second magnetic region (72) and the fifth magnetic region (82) are the same, and the magnetic poles of the first magnetic region (71), the third magnetic region (73), the fourth magnetic region (81) and the sixth magnetic region (83) are the same.

3. The improved magnetic lock according to claim 2, characterized in that: The width of the first magnet (7) is the same as the width of the second magnet (8), the width of the second magnetic region (72) is the same as the width of the fifth magnetic region (82), and the width of the first magnetic region (71), the third magnetic region (73), the fourth magnetic region (81) and the sixth magnetic region (83) are the same.

4. The improved magnetic lock according to claim 2, characterized in that: The first magnet (7) is integrally formed, and the first magnet (7) is magnetized to form the first magnetic region (71), the second magnetic region (72), and the third magnetic region (73).

5. The improved magnetic lock according to claim 2, characterized in that: The second magnet (8) is integrally formed, and the first magnet (7) is magnetized to form the fourth magnetic region (81), the fifth magnetic region (82), and the sixth magnetic region (83).

6. The improved magnetic lock according to claim 1, characterized in that: A fixing frame (91) and a shielding gasket (92) are provided in the lock box (9); the fixing frame (91) is provided with a groove (93); the lock box (9) is provided with a hollow portion (94) corresponding to the groove (93); the second magnet (8) is fixed to the back of the fixing frame (91) by a snap connection; the second magnet (8) is placed in the bottom area of ​​the groove (93); the shielding gasket (92) is placed in the groove (93); and the shielding gasket (92) and the groove (93) constitute the lock slot (90).

7. The improved magnetic lock according to claim 1, characterized in that: A first step hole (32) is formed on the outer end surface of the lock tongue body (3), a shielding cover (35) is provided in the first step hole (32), a first magnet (7) is disposed in the first step hole (32) and is connected and fixed to the lock tongue body (3), and the shielding cover (35) shields the first magnet (7).

8. The improved magnetic lock according to claim 1, characterized in that: The height of the second magnet (8) is greater than the height of the first magnet (7).

9. The improved magnetic lock according to claim 8, characterized in that: The height of the second magnet (8) is twice the height of the first magnet (7).

10. The improved magnetic lock according to claim 1, characterized in that: The bolt box (1) also includes A rotary transmission device (2) is arranged in the lock tongue box (1) and driven by the lock core. The transmission member (4) is movably arranged in the lock tongue box (1) along the extension and contraction direction of the lock tongue body (3), and the transmission member (4) and the inner end of the lock tongue body (3) are linked with each other with a virtual position. A first elastic member (5), wherein the elastic force of the first elastic member (5) causes the lock tongue body (3) to have a tendency to move into the lock tongue box (1), and the transmission member (4) to have a tendency to move out of the lock tongue box (1). a second elastic member (6), one end of the second elastic member (6) being connected to the lock tongue box (1), and the other end of the second elastic member (6) being connected to the transmission member (4), wherein the elastic force of the second elastic member (6) causes the transmission member (4) to tend to move toward the lock tongue body (3), When the lock tongue body (3) overcomes the elastic force of the second elastic member (6) and extends out of the lock tongue box (1), the virtual position of the lock tongue body (3) and the transmission member (4) is eliminated, the rotary transmission device (2) rotates to drive the transmission member (4) to move into the lock tongue box (1), and the transmission member (4) drives the lock tongue body (3) to retract into the lock tongue box (1).

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