Double drive mechanism of multipoint lock and mortise lock

Abstract

The utility model discloses a double drive mechanism of multipoint door lock and bolt lock, the rear end of push block sets up main drive board, and the front end of push block sets up vice drive board, the both ends of main drive board are connected with right drive link and left drive link respectively, right drive link and left drive link are connected with multipoint lock respectively, main drive board still sets up main drive board boss, and handle pawl main drive board drive pawl and main drive board boss correspond, and the other end of vice drive board sets up vice drive board hook edge, vice drive board hook edge hooks up bolt pawl drive column on bolt pawl, handle pawl and bolt pawl coaxial rotation connection on bottom box, and handle pawl pawl main drive board drive pawl and handle pawl bolt drive boss are set up on the outer circle of the center hole of handle pawl, handle pawl bolt drive boss is embedded in bolt pawl dead stroke groove of bolt pawl, the utility model has the advantages of: having double pick -proof mechanism and double locking system, safe and reliable.

Description

Technical Field

[0001] This utility model relates to the field of building hardware, specifically a lock, and more specifically a double-drive anti-pry door lock structure, suitable for high-security locations such as residences and public buildings. Background Technology

[0002] Locks are an essential appliance in every home. Currently, the multi-point locking technology used in doors and windows on the market mostly employs a single transmission chain for locking. If the multi-point lock's transmission mechanism is pried open, the entire lock will unlock. Utility Model Content

[0003] To solve the above-mentioned technical problems, the purpose of this utility model is to provide a dual transmission mechanism for a multi-point door lock and a latch door lock, including a base box 1 and a push block 21 driven by a lead screw 6 and disposed in the base box 1. The rear end of the push block 21 is provided with a main transmission plate driving protrusion 2103, and the front end of the push block 21 is provided with a secondary transmission plate driving protrusion 2104. The main transmission plate driving protrusion 2103 is embedded in the main transmission plate push block running groove 1904 at one end of the main transmission plate 19. The secondary transmission plate driving protrusion 2104 is embedded in the secondary transmission plate driving groove 1101 at one end of the secondary transmission plate 11.

[0004] The main drive plate driving protrusion 2103 and the auxiliary drive plate driving protrusion 2104 of the push block can be symmetrically arranged on the front and rear sides of the push block body.

[0005] The two ends of the main transmission plate 19 are connected to the right transmission rod 2 and the left transmission rod 17 respectively; the right transmission rod 2 and the left transmission rod 17 are connected to the multi-point lock respectively;

[0006] The other end of the main drive plate 19 is provided with a main drive plate rib 1903, and the handle pawl main drive plate drive lever 1302 corresponds to the main drive plate rib 1903.

[0007] The other end of the auxiliary transmission plate 11 is provided with a secondary transmission plate hook edge 1103, which hooks the lock tongue pawl drive column 1205 on the lock tongue pawl 12.

[0008] The handle pawl 13 and the latch pawl 12 are coaxially rotatably connected to the base box 1; a handle pawl main transmission plate drive lever 1302 and a handle pawl latch drive protrusion 1304 are provided on the outer circle of the center hole of the handle pawl 13, and the handle pawl latch drive protrusion 1304 is embedded in the latch pawl free stroke groove 1204 of the latch pawl 12; a latch pawl latch limit unlock lever 1203 is provided on the latch pawl 12, and the latch pawl latch limit unlock lever 1203 corresponds to the latch retraction drive platform 2003. The push block main transmission plate drive protrusion 2103 and the unlocking side of the main transmission plate push block running groove 1904 are ( Figure 1The gap on the right side is less than or equal to the unlocking side of the push block secondary transmission plate drive protrusion 2104 and the secondary transmission plate drive groove 1101. Figure 1 The gap on the right side is used to achieve sequential loading and prevent excessive initial resistance torque of the motor during electric unlocking.

[0009] A bottom box main drive plate unlocking limit block 102 is provided on the housing 1 at the rightward end position of the main drive plate 19. The length of the main drive plate unlocking empty stroke groove 1906 formed by the main drive plate push block running groove 1904 on the main drive plate 19 and the push block main drive plate driving protrusion 2103 of the push block 21 is greater than or equal to the distance from the right end of the main drive plate 19 to the bottom box main drive plate unlocking limit block 102. The purpose of the bottom box main drive plate unlocking limit block 102 is to prevent the main drive plate 19 from continuing to move to the right, thereby driving the auxiliary drive plate 11 to move to the right, so as to retract and unlock the latch.

[0010] A torsion spring 10 is provided at the lower part of the latch 20 to enable the latch to extend automatically; a latch limiting block 9 is provided on the right side of the latch.

[0011] The handle pawl 13 is equipped with a handle pawl spring push block drive block 1301, which corresponds to the handle pawl spring push block 14; the handle pawl spring push block 14 is located on the outside of the spring 15, and the inside of the spring 15 abuts against the limiting groove wall of the bottom box; through this structure, the handle pawl 13 is reset to rotate.

[0012] The main drive plate 19 is provided with a main drive plate damping locking point 1905, and the base box 1 is provided with a main drive plate damping spring 16; when the main drive plate 19 moves to the rightmost end, the main drive plate damping locking point 1905 compresses the main drive plate damping spring 16, which provides damping for the main drive plate.

[0013] The motor 3 is connected to the lead screw 6 via the coupling 4. The lead screw 6 is equipped with bearings 5 ​​at both ends. The lead screw 6 is screwed to the nut 7 inside the push block 21, thereby pushing the push block 21 to move left and right.

[0014] The motor 3 is connected to the door lock electronic control chip. After the electric drive locks and unlocks, the motor drives the push block 21 to move to the middle position of the lead screw 6.

[0015] The latch limit block 9 is equipped with a latch limit block torsion spring 8; under the action of the latch limit block torsion spring 8, it deflects towards the latch 20; before the latch 20 moves upward to the trigger position of the latch limit block 9, the latch guide edge 2001 of the latch 20 contacts the latch limit block guide edge 901 of the latch limit block 9, restricting the latch limit block 9 from further deflecting and limiting the latch 20; the latch 20 can move freely back and forth in this non-trigger position segment; when the latch 20 moves upward past the trigger position of the latch limit block 9, that is, when the latch guide edge 2001 of the latch 20 disengages from the latch limit block guide edge 901 of the latch limit block 9, the latch limit block 9 rotates further, and the latch limit block limiting point 902 on the latch limit block 9 rotates to below the latch limit point 2002 on the latch 20, so that the latch 20 cannot move downward, achieving the anti-pry effect.

[0016] The advantages of this utility model are: a dual locking and unlocking system with a multi-point lock and an anti-pry bolt; the multi-point lock transmission locking system and the bolt locking mechanism are physically isolated from each other and have no mechanical coupling. Dual anti-pry mechanism: In the locked state, the transmission multi-point lock system controlled by the main transmission plate and the bolt system controlled by the auxiliary transmission plate are independent of each other; both must be unlocked to unlock the lock.

[0017] Double locking system: When locked, the bolt can automatically lock using only its own mechanical structure. Even if the multi-point locking system is not locked, the lock still has anti-pry performance. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 for Figure 1 The front view;

[0020] Figure 3 for Figure 2 Enlarged image;

[0021] Figure 4 This is a three-dimensional schematic diagram of the transmission structure;

[0022] Figure 5 A schematic diagram of the idle stroke groove of the main drive plate in the locked state;

[0023] Figure 6 Schematic diagram of the idle stroke groove of the main drive plate in the unlocked state;

[0024] Figure 7 This is a schematic diagram of the latch structure;

[0025] Figure 8 This is a schematic diagram showing the connection between the limit block and the locking tongue;

[0026] Figure 9 A schematic diagram of the idle stroke groove for the latch pawl;

[0027] Figure 10 This is a diagram illustrating the unlocking of the latch;

[0028] Figure 11 Schematic diagram of the empty stroke groove of the push block of the auxiliary transmission plate;

[0029] Figure 12 Schematic diagram of the lock tongue reset structure and the main drive plate damping structure;

[0030] Component descriptions in the diagram:

[0031] 1. Base box;

[0032] 101. Locking limit block for the main drive plate of the bottom box;

[0033] 102. Unlocking limit block for the main drive plate of the bottom box;

[0034] 103. Bottom box push block guide groove;

[0035] 104. Bottom box locking tongue guide groove;

[0036] 2. Right drive rod;

[0037] 201. Right drive rod mounting slot;

[0038] 202. Right drive rod multi-point lock connecting block;

[0039] 3. Electric motor;

[0040] 4. Coupling;

[0041] 5. Bearings;

[0042] 6. Lead screw;

[0043] 7. Mother silk;

[0044] 8. Locking tongue limit block torsion spring;

[0045] 9. Locking tongue limit block;

[0046] 901. Locking tongue limit block guide edge

[0047] 902. Locking tongue limit block limit stop

[0048] 903. Unlocking surface of the locking tongue limit block

[0049] 10. Locking tongue torsion spring;

[0050] 11. Secondary transmission plate;

[0051] 1101. Sub-transmission plate drive slot;

[0052] 1102. Unlock the drive end of the auxiliary transmission board;

[0053] 1103. Outlining of the auxiliary transmission plate;

[0054] 1104. Secondary transmission plate push block idle stroke groove;

[0055] 12. Locking tongue claw;

[0056] 1201. Locking tongue pawl drive slot;

[0057] 1202. Locking tongue pawl locking tongue retraction drive point;

[0058] 1203. Locking tongue pawl, locking tongue limit and unlocking lever;

[0059] 1204. Locking tongue pawl idle travel groove;

[0060] 1205. Locking tongue pawl drive post;

[0061] 13. Holding hands and manipulating claws;

[0062] 1301. Handle pawl spring push block drive block;

[0063] 1302. Handle pawl main transmission plate drives the lever;

[0064] 1303. Handle pawl, square shaft mounting hole;

[0065] 1304. Handle pawl lock tongue drive protrusion;

[0066] 14. Handle, pawl, spring, push block;

[0067] 15. Handle pawl spring;

[0068] 16. Damping springs on the main drive plate;

[0069] 1601. Main drive plate damping spring limiting arc;

[0070] 17. Left drive rod;

[0071] 1701. Left drive rod mounting slot;

[0072] 1702. Left drive rod multi-point locking connection block;

[0073] 18. Panel;

[0074] 19. Main drive plate;

[0075] 1901. Main drive plate left drive rod engagement point;

[0076] 1902. Right drive rod engagement point on the main drive plate;

[0077] 1903. Main drive plate protruding rib;

[0078] 1904. Main drive plate push block running groove;

[0079] 1905. Main drive plate damping point;

[0080] 1906. Unlock the idle travel groove of the main drive plate;

[0081] 1907. The main drive plate locks the idle stroke groove;

[0082] 20. Locking tongue;

[0083] 2001. Locking tongue guide edge;

[0084] 2002. Locking tongue limit stop;

[0085] 2003. Locking tongue retraction drive unit;

[0086] 21. Push the block;

[0087] 2101. Push block guide protrusion one;

[0088] 2102. Push block guide protrusion two;

[0089] 2103. Push block main transmission plate drives the protrusion;

[0090] 2104. Push block auxiliary transmission plate drives the protrusion.

[0091] Note: Figure 1 Moving to the left locks the position, and moving to the right unlocks it. See the diagrams for other options. Figure 1 . Detailed Implementation

[0092] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. The terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0093] I. Control of Multi-point Locking Structure

[0094] The main drive plate 19 can move left and right within the base box 1, and is rigidly connected to the left drive rod 17, and the main drive rod 19 and the right drive rod 2 are connected by the main drive plate left drive rod engagement point 1901 on the main drive plate 19 and the left drive rod engagement slot 1701 on the left drive rod 17, and the main drive plate right drive rod engagement point 1902 on the main drive plate 19 and the right drive rod engagement slot 201 on the right drive rod 2. The base box 1 is provided with a base box main drive plate locking limit block 101 and a base box main drive plate unlocking limit block 102, and the main drive plate 19 can only move between the base box main drive plate locking limit block 101 and the base box main drive plate unlocking limit block 102. The left drive rod 17 and the right drive rod 2 are respectively provided with a left drive rod multi-point lock connecting block 1702 and a right drive rod multi-point lock connecting block 202 to match the existing multi-point lock structure of the drive rods of doors and windows. During the process of moving the main drive plate 19 to the rightmost end, the main drive plate damping stop 1905 on it compresses the main drive plate damping spring 16, and the limited damping force is limited by the rebound effect of the main drive plate damping spring limiting arc 1601 on it.

[0095] The handle pawl 13 can rotate on the base box 1. During rotation, the handle pawl spring push block drive block 1301 of the handle pawl 13 will compress the handle pawl spring 15 by pushing the handle pawl spring push block 14, thereby achieving the effect of resetting the rotation of the handle pawl 13. During the rotation of the handle pawl 13, the handle pawl main transmission plate drive lever 1302 on it will push the main transmission plate protrusion 1903 on the main transmission plate 19, causing the main transmission plate 19 to move from left to right.

[0096] The motor 3 is connected to the lead screw 6 via the coupling 4. The lead screw 6 is equipped with bearings 5 ​​at both ends. When the lead screw 6 rotates, it will push the nut 7 inside the push block 21 to move linearly, thereby pushing the push block 21 to move left and right. The push block guide protrusion 1 2101 and the push block guide protrusion 2102 on the push block 21 cooperate with the bottom box push block guide groove 103 on the bottom box 1 to realize the left and right linear movement of the push block 21 under the action of the motor 3.

[0097] The main drive plate 19 is provided with a main drive plate push block running groove 1904. The push block main drive plate driving protrusion 2103 on the push block 21 can move left and right in the main drive plate push block running groove 1904, and when it contacts the left and right sides of the main drive plate push block running groove 1904, it pushes the main drive plate 19 to move to the left and right sides.

[0098] The above structure achieves the following:

[0099] 1. The left transmission rod 17 and the right transmission rod 2 are driven by the motor to move to the leftmost end, thereby realizing the electric drive locking of the multi-point lock; the left transmission rod 17 and the right transmission rod 2 are driven to move to the rightmost end, thereby realizing the electric drive unlocking of the multi-point lock.

[0100] 2. When the handle is rotated, the handle pawl 13 is driven to rotate synchronously through the handle pawl square shaft mounting hole 1303 on the handle pawl 13, which moves the main transmission plate 19 to the right. After the action is completed, the handle pawl 13 is reset under the action of the handle pawl spring 15, thereby unlocking the handle of the multi-point lock.

[0101] Note: After the electric drive lock is engaged, the motor 3 needs to move the push block 21 to the middle position of the lead screw 6. The main drive plate push block running groove 1904 on the main drive plate 19 and the push block main drive plate driving protrusion 2103 of the push block 21 form the main drive plate unlocking empty stroke groove 1906. Through the bottom box main drive plate unlocking limit block 102 on the bottom box 1, the main drive plate unlocking empty stroke groove 1906 can ensure that when the main drive plate 19 moves to the rightmost position (unlocking direction), it will not collide with the push block main drive plate driving protrusion 2103 of the push block 21. That is, when an external force (such as prying a door) causes the main drive plate to move to the right and attempts to unlock, due to the setting of the empty stroke groove 1906, the main drive plate 19 will not push the push block 21 to the right, thereby preventing the rightward movement of the push block from causing the auxiliary drive plate to move to the right and resulting in the lock tongue retraction and unlocking. In other words, it prevents the external force from unlocking the lock tongue and overcomes the defect of the existing multi-point lock transmission mechanism that will cause the whole system to unlock when pried.

[0102] After the electric drive operation is unlocked, the motor 3 needs to move the push block 21 to the middle position of the lead screw 6. The main drive plate push block running groove 1904 on the main drive plate 19 and the push block main drive plate driving protrusion 2103 of the push block 21 form the main drive plate locking empty stroke groove 1907. Through the bottom box main drive plate locking limit block 101 on the bottom box 1, the main drive plate locking empty stroke groove 1907 can ensure that when the main drive plate 19 moves to the leftmost (locked) position, it will not collide with the push block main drive plate driving protrusion 2103 of the push block 21.

[0103] II. Control of the latch structure

[0104] The latch 20 can move up (locking direction) and down (unlocking direction) through the guide groove 104 on the bottom box 1. The latch torsion spring 10 provides the elastic force required when the latch 20 extends.

[0105] A latch limiting block 9 is provided on the rear side of the latch 20. Under the action of the latch limiting block torsion spring 8, the latch limiting block 9 deflects towards the latch 20. Before the latch 20 moves upward to the trigger position of the latch limiting block 9, the latch guide edge 2001 of the latch 20 contacts the latch limiting block guide edge 901 of the latch limiting block 9, restricting further deflection of the latch limiting block 9 and limiting the latch 20. The latch 20 can move freely back and forth in this non-trigger position segment. When the bolt 20 moves upward past the trigger position of the bolt limiting block 9, that is, when the bolt guide edge 2001 of the bolt 20 disengages from the bolt limiting block guide edge 901 of the bolt limiting block 9, the bolt limiting block 9 rotates further, and the bolt limiting block limiting point 902 on the bolt limiting block 9 rotates to below the bolt limiting point 2002 on the bolt 20, so that the bolt 20 cannot move downward (in the unlocking direction), thus achieving the anti-pry function.

[0106] The locking tongue pawl 12 and the handle pawl 13 are coaxially mounted, and the locking tongue pawl drive groove 1201 on the locking tongue pawl 12 cooperates with the handle pawl locking tongue drive protrusion 1304 on the handle pawl 13 to form the locking tongue pawl free stroke groove 1204. After the handle pawl locking tongue drive protrusion 1304 of the handle pawl 13 rotates through the locking tongue pawl free stroke groove 1204, the locking tongue pawl 12 can be rotated.

[0107] During the rotation of the latch pawl 12, the top of the latch pawl latch limit unlock lever 1203 on it will push the latch limit block 9 to the unlocking surface 903 of the latch limit block 9. By rotating the latch limit block 9, the latch limit locking point 2002 and the latch limit block limiting locking point 902 of the two are disengaged, thus completing the unlocking. At the same time as unlocking, the latch pawl latch retraction drive point 1202 on the latch pawl 12 moves the latch retraction drive platform 2003 of the latch 20, causing the latch 20 to move downward (in the unlocking direction).

[0108] The above structure enables the unlocking operation of the bolt 20 when the handle is turned to unlock.

[0109] The push block 21 and the locking tongue pawl 12 are connected by a transmission plate 11. The transmission plate 11 is provided with a secondary transmission plate drive groove 1101. The push block secondary transmission plate drive protrusion 2104 on the push block 21 can move left and right within the secondary transmission plate drive groove 1101. When it contacts the right side of the secondary transmission plate drive groove 1101, it pushes the secondary transmission plate 11 to move to the right. During the movement of the secondary transmission plate 11 to the right, the secondary transmission plate hook edge 1103 on it pulls the locking tongue pawl drive post 1205 on the locking tongue pawl 12, causing the locking tongue pawl 12 to rotate. This realizes the drive of the push block 21 on the locking tongue pawl 12, that is, realizes the electric drive unlocking of the locking tongue 20.

[0110] The auxiliary transmission plate drive groove 1101 on the auxiliary transmission plate 11 and the push block auxiliary transmission plate drive protrusion 2104 on the push block 21 form the auxiliary transmission plate push block idle stroke groove 1104, which is used to prevent the push block 21 from resetting to the middle position of the lead screw 6 and colliding with the auxiliary transmission plate 11 after the electric drive unlocks the lock tongue 20.

[0111] In summary, the "multi-point lock structure control" mechanism and the "lock tongue structure control" mechanism operate independently, providing two locking methods: "multi-point lock" and "lock tongue". When the lock is locked, both mechanisms must be unlocked simultaneously to fully unlock the lock and open the door, thus improving its anti-pry performance.

[0112] Note: The locking tongue 20 uses the current automatic triggering mechanical structure technology. Through the triggering of its structure, the locking tongue 20 can automatically extend by relying on the potential energy of the locking tongue torsion spring 10 to achieve automatic mechanical locking.

Claims

1. A dual-drive mechanism for a multi-point door lock and a latch door lock, comprising a base box (1) and a push block (21) driven by a lead screw (6) disposed within the base box (1), characterized in that: The rear end of the push block (21) is provided with a push block main transmission plate driving protrusion (2103), and the front end of the push block (21) is provided with a push block secondary transmission plate driving protrusion (2104); the push block main transmission plate driving protrusion (2103) is embedded in the main transmission plate push block running groove (1904) at one end of the main transmission plate (19); the push block secondary transmission plate driving protrusion (2104) is embedded in the secondary transmission plate driving groove (1101) at one end of the secondary transmission plate (11); The two ends of the main transmission plate (19) are connected to the right transmission rod (2) and the left transmission rod (17) respectively; the right transmission rod (2) and the left transmission rod (17) are connected to the multi-point lock respectively; The other end of the main drive plate (19) is provided with a main drive plate rib (1903), and the main drive plate drive lever (1302) of the handle pawl corresponds to the main drive plate rib (1903). The other end of the auxiliary transmission plate (11) is provided with a hook edge (1103), which hooks the hook edge (1103) onto the lock tongue pawl drive column (1205) on the lock tongue pawl (12). The handle pawl (13) and the latch pawl (12) are coaxially rotatably connected to the base box (1); the handle pawl main transmission plate drive lever (1302) and the handle pawl latch drive protrusion (1304) are provided on the outer circle of the center hole of the handle pawl (13), and the handle pawl latch drive protrusion (1304) is embedded in the latch pawl free stroke groove (1204) of the latch pawl (12); the latch pawl latch limit unlock lever (1203) is provided on the latch pawl (12), and the latch pawl latch limit unlock lever (1203) corresponds to the latch retraction drive platform (2003).

2. The dual-transmission mechanism of the multi-point door lock and the latch door lock according to claim 1, characterized in that: The gap between the push block main drive plate driving protrusion (2103) and the unlocking side of the main drive plate push block running groove (1904) is less than or equal to the gap between the push block secondary drive plate driving protrusion (2104) and the unlocking side of the secondary drive plate driving groove (1101).

3. The dual transmission mechanism of the multi-point door lock and the latch door lock according to claim 1, characterized in that: The main drive plate unlocking limit block (102) is provided on the box body (1) at the rightward end position of the main drive plate (19).

4. The dual transmission mechanism of the multi-point door lock and the latch door lock according to claim 1, characterized in that: A torsion spring (10) is provided at the lower part of the latch (20), and a latch limiting block (9) is provided on the right side of the latch (20).

5. The dual-transmission mechanism of the multi-point door lock and the latch door lock according to claim 1, characterized in that: The handle pawl (13) is equipped with a handle pawl spring push block drive block (301), which corresponds to the handle pawl spring push block (14); the handle pawl spring push block (14) is located on the outside of the spring (15), and the inside of the spring (15) abuts against the limiting groove wall of the bottom box.

6. The dual transmission mechanism of the multi-point door lock and the latch door lock according to claim 1, characterized in that: The main drive plate (19) is provided with a main drive plate damping locking point (1905), and the main drive plate damping spring (16) is provided on the bottom box (1); when the main drive plate (19) moves to the rightmost end, the main drive plate damping locking point (1905) compresses the main drive plate damping spring (16).

7. The dual-transmission mechanism of the multi-point door lock and the latch door lock according to claim 1, characterized in that: The motor (3) is connected to the lead screw (6) via a coupling (4). The lead screw (6) is equipped with bearings (5) at both ends. The lead screw (6) is screwed to the nut (7) inside the push block (21), thereby pushing the push block (21) to move left and right.

8. The dual transmission mechanism of the multi-point door lock and the latch door lock according to claim 1, characterized in that: The motor (3) is connected to the door lock electronic control chip. After the electric drive controls the locking and unlocking, the motor drives the push block (21) to move to the middle position of the lead screw (6).

9. The dual-transmission mechanism of the multi-point door lock and the latch door lock according to claim 3, characterized in that: The length of the main drive plate push block running groove (1904) on the main drive plate (19) and the push block main drive plate drive protrusion (2103) of the push block (21) forming the main drive plate unlocking empty stroke groove (1906) is greater than or equal to the distance from the right end of the main drive plate (19) to the main drive plate unlocking limit block (102) of the bottom box.

10. The dual transmission mechanism of the multi-point door lock and the latch door lock according to claim 4, characterized in that: The latch limit block (9) is equipped with a latch limit block torsion spring (8); under the action of the latch limit block torsion spring (8), it deflects towards the latch (20); before the latch (20) moves upward to the trigger position of the latch limit block (9), the latch guide edge (2001) of the latch (20) contacts the latch limit block guide edge (901) of the latch limit block (9), restricting the latch limit block (9) from further deflecting and limiting the latch (20); the latch (20) can move freely back and forth in this non-trigger position segment. Movement; when the latch (20) moves upward through the trigger position of the latch limit block (9), that is, the latch guide edge (2001) of the latch (20) and the latch limit block guide edge (901) of the latch limit block (9) disengage, the latch limit block (9) rotates further, and the latch limit block limit stop (902) on the latch limit block (9) rotates to below the latch limit stop (2002) on the latch (20), so that the latch (20) cannot move downward, thus achieving the anti-pry effect.

Images