A high-security door latch device

Abstract

This utility model relates to the field of combination locks, specifically a high-security door latch device. When the password is entered correctly, rotating the password panel causes the lock cylinder assembly to rotate. A square protrusion engages with a square groove, enabling the lock cylinder assembly to drive the transmission wheel to rotate. A protrusion engages with a limiting groove, allowing the transmission wheel to drive the transmission plate to move up and down, thereby disengaging the locking block from the groove and releasing the connecting assembly. This allows the swing arm to rotate freely, enabling the door to open and close. The groove design allows the password assembly to position the swing arm when it rotates 90° or 180°. In other words, the password assembly can lock and fix the swing arm in both open and closed states, providing anti-pry and anti-reverse locking functions, further enhancing the security of the door latch device. This solves the problems of poor linkage between the combination lock and the swing arm in existing door latch devices, and weak overall anti-pry capability.

Description

Technical Field

[0001] This utility model relates to the field of password door lock technology, and in particular to a high-security door latch device. Background Technology

[0002] Existing door latch structures typically include a base, a swing arm, and a locking assembly. The door is secured by the interaction of the swing arm and the limit hook. Some door latches also integrate a combination lock mechanism to enhance security.

[0003] However, in traditional door latch designs, the mounting holes are usually exposed to the external environment without effective protection. This allows unauthorized individuals to easily damage the latch using tools such as pry bars and drills, posing a significant security risk. Furthermore, in existing technologies, the combination lock components and the swing arm are often functionally independent, failing to truly link with the mechanical lock body. This means that even with an incorrect password, the lock can still be forcibly opened by external force, resulting in insufficient security for the overall locking structure.

[0004] Therefore, there is an urgent need for a door latch device with a reasonable structure and high security. Utility Model Content

[0005] To address the issues of poor linkage between the combination lock and the swing arm in existing door latch devices, resulting in weak overall anti-pry capability.

[0006] This utility model provides a high-security door latch device, including a first base, a second base, and a swing arm; the first base is provided with a first limiting hook; the second base is provided with a connecting assembly; one end of the swing arm is rotatably connected to the second base through the connecting assembly, and the other end of the swing arm can be rotatably fixed to the first limiting hook; the second base is also provided with a password assembly; the password assembly includes a password faceplate, a lock cylinder assembly, a transmission wheel, a transmission plate, and a lock block; the password faceplate and the lock cylinder assembly are fixedly connected; the lock cylinder assembly is used to control the locking and unlocking of the swing arm, and the lock cylinder assembly includes a square groove for driving the transmission wheel to rotate; the center of the transmission wheel is provided with a square protrusion corresponding to the square groove, and the edge of the transmission wheel is provided with a protruding post; the bottom of the transmission plate is provided with a transverse strip-shaped limiting groove, the protruding post is provided in the limiting groove, and the top of the transmission plate is provided with a locking block; the lock block and the connecting assembly are fixedly connected, and the edge of the lock block is provided with a locking groove corresponding to the locking block, there are four locking grooves, the locking grooves are evenly distributed in a ring around the outer periphery of the lock block, and adjacent locking grooves form a 90° central angle.

[0007] Preferably, the first base includes a first base plate and a first cover, a first limiting hook is disposed on the first base plate, the first cover is provided with a hook hole, and the first limiting hook passes through the hook hole; the top of the first base plate is provided with a first latch, the first cover is provided with a first through groove corresponding to the position of the first latch; the bottom of the first base plate is provided with a limiting cap groove, and the bottom of the first cover is provided with a first threaded hole corresponding to the position of the limiting cap groove.

[0008] Preferably, the second base includes a second base plate and a second cover. The second base plate has a connecting hole, and the second cover has a mounting hole corresponding to the position of the connecting hole. The password cover is used to cover the mounting hole.

[0009] Preferably, the top of the second base plate is provided with a second hook, and the second cover is provided with a second through groove corresponding to the position of the second hook.

[0010] Preferably, the lock cylinder assembly includes a lock cylinder seat and a dial, a limiting gear, and a bolt mounted on one side of the lock cylinder seat, with a square groove on the other side of the lock cylinder seat; the combination lock faceplate has a dial hole and a first lock hole, the position of the dial hole corresponding to the position of the dial; the second base has a mounting seat for mounting the lock cylinder assembly, and the mounting seat has a second lock hole; the bolt passes through the limiting gear, the dial is sleeved on the outside of the limiting gear, one end of the bolt abuts against the mounting seat, and the other end of the bolt can pass through the first lock hole and the second lock hole.

[0011] Preferably, the second base has a mounting groove and a guide groove communicating with the mounting groove. The guide groove has a spring and a ball bearing inside. One end of the spring is connected to the guide groove, and the other end of the spring is connected to the ball bearing. The connecting assembly includes a connector and a rotating wheel. The locking block is located on one side of the mounting groove. One end of the connector has a cylindrical protrusion, and the other end of the connector has a slot. The middle part of the connector has a groove communicating with the slot. The cylindrical protrusion passes through the mounting groove and connects with the locking block. The cylindrical protrusion has several arc grooves. The slot has a limiting protrusion. The rotating wheel is installed in the groove. One end of the swing arm has a threaded rod and a limiting groove. The threaded rod is inserted into the slot and threadedly connected to the rotating wheel. The limiting protrusion is locked in the limiting groove. The other end of the swing arm can be rotatably connected to the first limiting hook.

[0012] Preferably, there are four arc-shaped grooves, and the arc-shaped grooves are arranged in a ring at equal intervals along the outer ring surface of the cylindrical protrusion.

[0013] Preferably, the cylindrical protrusion is provided with a second threaded hole, and protrusions are provided on both sides of the second threaded hole. The locking block is provided with a limiting hole corresponding to the position of the protrusion.

[0014] Preferably, the free end of the swing arm is provided with a second limiting hook, which can be locked with the first limiting hook.

[0015] Preferably, the bottom of the password cover is provided with a cover plate, which is used to cover the mounting hole.

[0016] The beneficial effects of this utility model are as follows: When the password is entered correctly, rotating the password panel causes the lock cylinder assembly to rotate. A square protrusion engages with the square groove, enabling the lock cylinder assembly to drive the transmission wheel to rotate. A protrusion engages with the limiting groove, allowing the transmission wheel to drive the transmission plate to move up and down, thus disengaging the locking block from the slot and releasing the connecting assembly. This allows the swing arm to rotate freely, enabling the door to open and close. The slot design allows the password assembly to position the swing arm when it rotates 90° or 180°. In other words, the password assembly can lock and fix the swing arm in both open and closed states, providing anti-pry and anti-reverse locking protection, further enhancing the security of the door bolt device. The linkage design between the password assembly and the swing arm enhances anti-theft capabilities, improves anti-vandalism opening performance, and increases operational convenience. It solves the problems of poor linkage between the password lock and the swing arm in existing door latch devices, and weak overall anti-pry capability. Attached Figure Description

[0017] Figure 1 A perspective view of the high-security door latch device provided by this utility model.

[0018] Figure 2 This is one of the exploded views of the high-security door latch device provided by this utility model.

[0019] Figure 3 The second exploded view of the high-security door latch device provided by this utility model.

[0020] Figure 4 The third exploded view of the high-security door latch device provided by this utility model.

[0021] Figure 5 The fourth exploded view of the high-security door latch device provided by this utility model.

[0022] In the picture: 1-First base; 11-First base plate; 111-First limiting hook; 112-First latch; 113-Limit cap groove; 12-First cover; 121-Hook hole; 122-First through groove; 123-First threaded hole; 2-Second base; 21-Second base plate; 211-Connecting hole; 212-Second latch; 22-Second cover; 221-Mounting hole; 222-Second through groove; 23-Mounting base; 231-Second lock hole; 24-Mounting groove; 25-Guide groove; 251-Spring; 252-Tuning ball; 3-Swing arm; 31-Threaded rod; 32-Limiting groove; 33-Second limiting hook; 4-Password assembly; 41-Password 411-Turn hole; 412-First lock hole; 413-Cover plate; 42-Lock cylinder assembly; 421-Square groove; 422-Lock cylinder seat; 423-Turn wheel; 424-Limit gear; 425-Lock tongue; 43-Drive wheel; 431-Square protrusion; 432-Protrusion; 44-Drive plate; 441-Limit groove; 442-Clock block; 45-Lock block; 451-Clock groove; 452-Limit hole; 5-Connecting assembly; 51-Connector; 511-Cylindrical protrusion; 511a-Arc groove; 511b-Second threaded hole; 511c-Protrusion; 512-Slot; 512a-Limit protrusion; 513-Turn groove; 52-Rotating wheel. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] Reference Figures 1-5A high-security door latch device includes a first base 1, a second base 2, and a swing arm 3. The first base 1 is provided with a first limiting hook 111. The second base 2 is provided with a connecting assembly 5. One end of the swing arm 3 is rotatably connected to the second base 2 via the connecting assembly 5, and the other end of the swing arm 3 can be rotatably fixed to the first limiting hook 111. The second base 2 is also provided with a combination lock assembly 4. The combination lock assembly 4 includes a combination lock faceplate 41, a lock cylinder assembly 42, a transmission wheel 43, a transmission plate 44, and a lock block 45. The combination lock faceplate 41 and the lock cylinder assembly 42 are fixedly connected. The lock cylinder assembly 42 is used to control the locking and unlocking of the swing arm. It includes a square groove 421 for driving the transmission wheel 43 to rotate; the center of the transmission wheel 43 is provided with a square protrusion 431 corresponding to the square groove 421, and the edge of the transmission wheel 43 is provided with a protruding post 432; the bottom of the transmission plate 44 is provided with a transverse strip-shaped limiting groove 441, the protruding post 432 is provided in the limiting groove 441, and the top of the transmission plate 44 is provided with a locking block 442; the locking block 45 and the connecting assembly 5 are fixedly connected, and the edge of the locking block 45 is provided with a locking groove 451 corresponding to the locking block 442. There are four locking grooves 451, which are evenly distributed in a ring along the outer periphery of the locking block 45, and a 90° central angle is formed between adjacent locking grooves 451.

[0025] When the password is entered correctly, rotating the password panel causes the lock cylinder assembly 42 to rotate. The square protrusion 431 engages with the square groove 421, enabling the lock cylinder assembly 42 to drive the transmission wheel 43 to rotate. The protrusion 432 engages with the limiting groove 441, causing the transmission wheel 43 to drive the transmission plate up and down, thus disengaging the locking block 442 from the locking groove 451, releasing the connecting assembly 5 and allowing the swing arm 3 to rotate freely, enabling the door to open and close. The locking groove 451 allows the password assembly 4 to position the swing arm 3 when it rotates 90° or 180°. In other words, the password assembly 4 can lock and fix the swing arm 3 in both open and closed states, providing anti-pry and anti-reverse locking protection, further enhancing the security of the door bolt device. The linkage design between the password assembly 4 and the swing arm 3 enhances anti-theft capabilities, improves anti-vandalism opening performance, and increases operational convenience. It solves the problems of poor linkage between the password lock and the swing arm 3 in existing door latch devices and weak overall anti-pry capabilities.

[0026] In some embodiments, the first base 1 includes a first base plate 11 and a first cover 12. A first limiting hook 111 is disposed on the first base plate 11, and the first cover 12 is provided with a hook hole 121 through which the first limiting hook 111 passes. The top of the first base plate 11 is provided with a first latch 112, and the first cover 12 is provided with a first through groove 122 corresponding to the position of the first latch 112. The bottom of the first base plate 11 is provided with a limiting cap groove 113, and the bottom of the first cover 12 is provided with a first threaded hole 123 corresponding to the position of the limiting cap groove 113.

[0027] The first base plate 11, as the main load-bearing structural component, can be installed on walls or doors and windows in various ways, including but not limited to pasting, drilling threaded holes and fixing with screws.

[0028] The first cover 12 serves to protect the first base plate 11 and places the first limiting hook 111 on the first base plate 11, making the first limiting hook 111 less likely to be disassembled or damaged.

[0029] The first hook 112 is engaged with the first through groove 122, and the bolt passes through the first threaded hole 123 and the limiting cap groove 113 for connection, thus achieving a fixed connection between the first base plate 11 and the first cover 12. (Refer to...) Figure 2 , 4 As can be seen from 5, the first hook 112, the first through groove 122, the first threaded hole 123 and the limiting cap groove 113 are all located in the internal space enclosed by the first base plate 11 and the first cover 12, which is a hidden design and is not easy to be disassembled and damaged.

[0030] Reference Figure 4 Preferably, the second base 2 includes a second base plate 21 and a second cover 22. The second base plate 21 is provided with a connection hole 211, and the second cover 22 is provided with a mounting hole 221 corresponding to the position of the connection hole 211. The password cover 41 is used to cover the mounting hole 221.

[0031] The second base plate 21 and the second cover 22 are fixedly connected by bolts through the mounting holes 221 and the connecting holes 211. The mounting holes 221 are protected by the password cover 41 to prevent malicious removal or damage to the internal key components of the door latch device.

[0032] Preferably, the top of the second base plate 21 is provided with a second hook 212, and the second cover 22 is provided with a second through groove 222 corresponding to the position of the second hook 212.

[0033] The second base plate 21 and the second cover 22 are fixedly connected by the second hook 212 engaging with the second through slot 222. (See reference) Figure 2 and 4 It can be seen that the second hook 212 and the second through groove 222 are both located in the internal space enclosed by the second base plate 21 and the second cover 22. They are hidden and not easily disassembled or damaged.

[0034] In some implementations, the lock cylinder assembly 42 is a dial 423 lock cylinder.

[0035] The dial 423 lock cylinder typically includes a set of dials 423, a turntable, a positioning pin, a return spring 251, and a lock cylinder body. The set of dials 423 is used to input password combinations, with each dial 423 corresponding to a password number. The turntable is connected to an internal transmission mechanism to transmit rotational motion. The positioning pin identifies whether the password is correct and restricts or allows the turntable to rotate. The return spring 251 returns the lock cylinder to its initial position after operation. The lock cylinder body carries all components and is fixed in the mounting structure. The dial 423 lock cylinder is prior art and not an improvement of this utility model. The lock cylinder assembly 42, which is a dial 423 lock cylinder, is merely one embodiment of this utility model, and will not be described in detail here.

[0036] Reference Figure 4-5 In some embodiments, the lock cylinder assembly 42 includes a lock cylinder seat 422 and a dial 423, a limiting gear 424, and a bolt 425 mounted on one side of the lock cylinder seat 422. A square groove 421 is provided on the other side of the lock cylinder seat 422. The combination lock cover 41 is provided with a dial hole 411 and a first lock hole 412. The position of the dial hole 411 corresponds to the position of the dial 423. The second base 2 is provided with a mounting seat 23 for mounting the lock cylinder assembly 42. The mounting seat 23 is provided with a second lock hole 231. The bolt 425 passes through the limiting gear 424. The dial 423 is sleeved on the outside of the limiting gear 424. One end of the bolt 425 abuts against the mounting seat 23. The other end of the bolt 425 can pass through the first lock hole 412 and the second lock hole 231.

[0037] The dial 423 is used to set the combination of passwords, which the user can rotate through the dial hole 411 on the password faceplate 41; the limit gear 424 is used to control the extension and retraction position of the bolt 425; after the password is successfully verified, the bolt 425 retracts, allowing the entire lock cylinder assembly 42 to rotate and drive the lock plate to move to complete the unlocking; when the password is incorrect, the bolt 425 remains extended to prevent the lock cylinder assembly 42 from rotating, thereby achieving anti-pry protection.

[0038] Reference Figure 4-5In some embodiments, the second base 2 is provided with a mounting groove 24 and a guide groove 25 communicating with the mounting groove 24. A spring 251 and a ball bearing 252 are provided inside the guide groove 25. One end of the spring 251 is connected to the guide groove 25, and the other end of the spring 251 is connected to the ball bearing 252. The connecting assembly 5 includes a connector 51 and a rotating wheel 52. The locking block 45 is located on one side of the mounting groove 24. One end of the connector 51 is provided with a cylindrical protrusion 511, and the other end of the connector 51 is provided with a slot 512. The middle portion of the connector 51 is provided with... There is a slot 513 that communicates with the slot 512. A cylindrical protrusion 511 passes through the mounting groove 24 and is connected to the locking block 45. The cylindrical protrusion 511 is provided with several arc grooves 511a. A limiting protrusion 512a is provided in the slot 512. The rotating wheel 52 is installed in the slot 513. One end of the swing arm 3 is provided with a threaded rod 31 and a limiting groove 32. The threaded rod 31 is inserted into the slot 512 and threadedly connected to the rotating wheel 52. The limiting protrusion 512a is locked in the limiting groove 32. The other end of the swing arm 3 can be rotatably connected to the first limiting hook 111.

[0039] Because the rotating wheel 52 and the swing arm 3 are threaded together, and the rotating wheel 52 is located inside the slot 513, turning the rotating wheel 52 causes it to rotate in different directions, enabling the swing arm 3 to move back and forth relative to the second base 2. The connecting piece 51 and the locking block 45 connect the connecting piece 51 to the second base 2, and the limiting protrusion 512a engages with the limiting groove 32, achieving synchronous rotation of the swing arm 3 and the connecting piece 51. The spring 251 presses the bead 252, causing it to embed into the arc groove 511a, thus positioning the connecting piece 51 and ensuring a stable connection between the swing arm 3 and the first limiting hook 111. By setting the locking block 45, the connecting piece 51, and the rotating wheel 52 to connect the swing arm 3 and the second base 2, the rotation and positioning functions of the swing arm 3 are achieved, as well as the back and forth movement of the swing arm 3 relative to the second base 2. This solves the problem that existing door latches cannot be used when there is a height difference between the door and the mounting surface, resulting in poor flexibility and adaptability.

[0040] Preferably, there are four arc-shaped grooves 511a, and the arc-shaped grooves 511a are arranged in a ring at equal intervals along the outer ring surface of the cylindrical protrusion 511.

[0041] As the spring 251 compresses the ball bearing 252, the connector 51 rotates synchronously with the swing arm 3. The ball bearing 252 will be embedded into the arc groove 511a as the connector 51 rotates, providing a stable positioning effect. Each arc groove 511a is an adjustment position. By setting four arc grooves 511a, a larger adjustment range and higher flexibility are provided, so that the swing arm 3 can be positioned by the ball bearing 252 every 90 degrees of rotation, preventing the connector 51 from rotating accidentally.

[0042] Reference Figure 4-5Preferably, the cylindrical protrusion 511 is provided with a second threaded hole 511b, and protrusions 511c are provided on both sides of the second threaded hole 511b. The locking block 45 is provided with a limiting hole 452 corresponding to the position of the protrusion 511c.

[0043] The protrusion 511c is inserted into the limiting hole 452, which serves as a limit, ensuring that the connector 51 maintains the correct alignment during installation and enabling synchronous rotation of the connector 51 and the locking block 45. In addition to bolt fixing, the protrusion 511c inserted into the limiting hole 452 adds an extra locking point, further enhancing the stability of the connection between the connector 51 and the locking block 45.

[0044] Reference Figure 5 In some embodiments, the free end of the swing arm 3 is provided with a second limiting hook 33, which can be locked with the first limiting hook 111.

[0045] By setting a second limiting hook 33, the connection between the swing arm 3 and the first limiting hook 111 is made tighter, reducing shaking and loosening, and maintaining long-term stability and durability.

[0046] Reference Figure 5 In some embodiments, the bottom of the password cover 41 is provided with a cover plate 413, which is used to cover the mounting hole 221.

[0047] In addition to blocking the mounting hole 221 and preventing external damage to the internal components through the mounting hole 221, the cover plate 413 can also effectively prevent dust and moisture from entering the mounting hole 221.

[0048] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-security door latch device, comprising a first base, a second base, and a swing arm; the first base is provided with a first limiting hook; the second base is provided with a connecting assembly; one end of the swing arm is rotatably connected to the second base via the connecting assembly, and the other end of the swing arm can be rotatably fixed to the first limiting hook; characterized in that: The second base also includes a combination lock assembly; the combination lock assembly includes a combination lock faceplate, a lock cylinder assembly, a transmission wheel, a transmission plate, and a lock block; the combination lock faceplate and the lock cylinder assembly are fixedly connected; the lock cylinder assembly is used to control the locking and unlocking of the lever, and includes a square groove for driving the transmission wheel to rotate; the center of the transmission wheel has a square protrusion corresponding to the square groove, and the edge of the transmission wheel has a protruding post; the bottom of the transmission plate has a horizontal strip-shaped limiting groove, the protruding post is located in the limiting groove, and the top of the transmission plate has a locking block; the lock block and the connecting assembly are fixedly connected, and the edge of the lock block has a locking groove corresponding to the locking block, there are four locking grooves, the locking grooves are evenly distributed in a ring around the outer periphery of the lock block, and adjacent locking grooves form a 90° central angle.

2. The high security door closer device according to claim 1, wherein: The first base includes a first base plate and a first cover. A first limiting hook is provided on the first base plate, and the first cover has a hook hole through which the first limiting hook passes. A first latch is provided on the top of the first base plate, and a first through groove corresponding to the position of the first latch is provided on the first cover. A limiting cap groove is provided on the bottom of the first base plate, and a first threaded hole corresponding to the position of the limiting cap groove is provided on the bottom of the first cover.

3. The high security door closer device according to claim 1, wherein: The second base includes a second base plate and a second cover. The second base plate has a connection hole, and the second cover has a mounting hole corresponding to the position of the connection hole. The password cover is used to cover the mounting hole.

4. The high security door closer device according to claim 3, wherein: The top of the second base plate is provided with a second hook, and the second cover is provided with a second through groove corresponding to the position of the second hook.

5. The high security door closer device of claim 1, wherein: The lock cylinder assembly includes a lock cylinder base and a dial, a limiting gear, and a bolt mounted on one side of the lock cylinder base. A square groove is provided on the other side of the lock cylinder base. The combination lock faceplate has a dial hole and a first lock hole, with the position of the dial hole corresponding to the position of the dial. The second base has a mounting seat for mounting the lock cylinder assembly, and the mounting seat has a second lock hole. The bolt passes through the limiting gear, the dial is sleeved on the outside of the limiting gear, one end of the bolt abuts against the mounting seat, and the other end of the bolt can pass through the first lock hole and the second lock hole.

6. The high security door closer device of claim 1, wherein: The second base has a mounting groove and a guide groove communicating with the mounting groove. The guide groove contains a spring and a ball bearing. One end of the spring is connected to the guide groove, and the other end of the spring is connected to the ball bearing. The connecting assembly includes a connector and a rotating wheel. The locking block is located on one side of the mounting groove. One end of the connector has a cylindrical protrusion, and the other end of the connector has a slot. The middle part of the connector has a groove communicating with the slot. The cylindrical protrusion passes through the mounting groove and connects with the locking block. The cylindrical protrusion has several arc-shaped grooves. The slot has a limiting protrusion. The rotating wheel is installed in the groove. One end of the swing arm has a threaded rod and a limiting groove. The threaded rod is inserted into the slot and threadedly connected to the rotating wheel. The limiting protrusion is locked in the limiting groove. The other end of the swing arm can be rotatably connected to the first limiting hook.

7. A high security door closer device according to claim 6, wherein: The circular arc grooves are provided in four places, and the circular arc grooves are arranged in a ring at equal intervals along the outer ring surface of the cylindrical protrusion.

8. The high security door closer device of claim 6, wherein: The cylindrical protrusion is provided with a second threaded hole, and protrusions are provided on both sides of the second threaded hole. The locking block is provided with a limiting hole corresponding to the position of the protrusion.

9. The high security door closer of claim 1, wherein: The free end of the swing arm is provided with a second limiting hook, which can be locked with the first limiting hook.

10. The high security door closer of claim 1, wherein: The bottom of the password faceplate has a cover plate, which is used to cover the mounting holes.

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