Dual handle operated multi-functional security side door lock

Abstract

This utility model relates to the field of rail transit technology, specifically to a multi-functional safety side door lock with dual handle operation. The utility model includes a lock body box, with a handle I and a torque wrench on the front and a handle II and a lock cylinder on the back. The lock body box contains a slanted latch, a central latch, and a square latch. It also includes a limit plate II, a limit plate I, a transmission plate, and a rotating plate, enabling automatic locking, manual unlocking, and safety locking upon closing. This utility model achieves this by rationally arranging the slanted latch, central latch, square latch, limit plate, transmission plate, and rotating plate within the lock body box, and by ensuring the proper fit between the limit post and the groove / slot. The dual handles and torque wrench have clearly defined functions, making locking and unlocking operations simple and easy to understand. The torque wrench can simultaneously constrain or release multiple latches. It offers three states: automatic locking upon closing, manual unlocking, and safety locking, meeting the needs of different scenarios and providing safe and quick operation.

Description

Technical Field

[0001] This utility model relates to the field of rail transit technology, specifically to a multi-functional safety side door lock with dual handle operation. Background Technology

[0002] In the current field of door lock technology, traditional side door locks have limited functionality and are difficult to adapt to the diverse usage scenarios and needs of rail transit. Therefore, those skilled in the art have actively explored solutions. Taking the reverse-lift locking lock body disclosed in Chinese Patent Publication No. CN221031953U as an example, this design has several problems. First, the lock body is only equipped with two bolts, resulting in weak security protection. Second, the transmission design of the double handles and bolts is flawed. Even if the number of bolts is increased to improve security, the double handles cannot control the movement of three bolts, making it difficult to flexibly control the bolts and meet the diverse needs of users for bolt states in different scenarios. Furthermore, existing door locks cannot lock multiple bolts at once using a knob. When multiple bolts need to be controlled simultaneously, users can only operate the corresponding control components one by one, a cumbersome and laborious process. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a multi-functional safety side door lock with dual handle operation.

[0004] The technical solution adopted in this utility model is as follows: A multi-functional safety side door lock with dual handle operation includes a lock body box. The front of the lock body box has a handle I and a torque handle, while the back has a handle II and a lock cylinder. The lock body box contains a slanted bolt, a center bolt, and a square bolt. The lock body box also includes a limit plate II, a limit plate I, a transmission plate, and a rotating plate. The oblique latch, the center latch, and the square latch are arranged sequentially from top to bottom inside the lock body box; a limit plate II is provided between the oblique latch and the center latch, and a limit contact that cooperates with the center latch is provided on the limit plate II; a limit plate I is provided between the center latch and the square latch, and a hook that cooperates with the square latch is provided below the limit plate I. A rotating plate is provided between the limiting plate II and the limiting plate I. The lower end of the rotating plate is provided with a limiting hole that cooperates with the square locking tongue limiting post. The middle part of the rotating plate is provided with a groove that abuts against the limiting plate I and the limiting plate II. The top of the rotating plate is provided with a slot that cooperates with the rotor. The bottom of the rotor is provided with a slot that mates with the rotating plate, and the top of the rotor is provided with a paddle that mates with the oblique locking tongue. The paddle is provided with a limiting post that mates with the oblique locking tongue. A transmission plate is provided between the square locking tongue and the oblique locking tongue. A handle is provided at the bottom of the transmission plate, and a paddle that cooperates with the transmission plate is provided on the handle. The middle part of the transmission plate is connected to the rotating plate through a limiting post, and the top of the transmission plate extends into the groove of the oblique locking tongue.

[0005] This technical solution utilizes the rational arrangement of components such as the angled latch, center latch, square latch, limiting plate, transmission plate, and rotating plate within the lock body, leveraging their connections and coordination, such as the fit between the limiting post and the groove / slot. Specifically, the inner and outer handles, through components like the rotor, convert the rotational operation into the extension and retraction of the angled and square latches, enabling door opening. The torque handle moves the transmission plate, simultaneously constraining or releasing the angled, center, and square latches, completing locking or unlocking, achieving multiple functional states. The clear division of labor between the two handles and the torque handle makes operation simple and easy to understand, greatly improving the convenience of using the door lock. This technical solution, through the rational arrangement of the three latches and the mechanical connection and coordination between the limiting plate, rotating plate, rotor, and transmission plate, converts the rotational motion of the torque handle and rotor into the linear extension and retraction motion of the latches. The rotating plate connects to related components via grooves and slots to achieve power transmission and direction conversion; the rotor controls its movement through the action of the lever and the angled latch; the transmission plate connects the handle, rotating plate, and angled latch to form a complete transmission chain, ensuring that each latch moves according to predetermined logic. Specifically, the three types of latches are arranged from top to bottom, which is beneficial for space utilization and functional differentiation; the limiting plate precisely controls the extension and retraction range and direction of the latch through limiting posts and hooks to prevent excessive movement or misalignment; the rotating plate, through grooves and slots, cooperates with the limiting plate and rotor to convert the rotor's rotation into the linear motion of the latch; the rotor, through the lever, links with the angled latch to achieve flexible extension and retraction of the angled latch; the transmission plate connects the handle, rotating plate, and angled latch, transmitting the rotational force of the handle through the rotating plate to drive the angled latch, while its own movement is constrained by the limiting posts of the rotating plate, ensuring the coordination of all components and achieving stable opening and closing of the door lock.

[0006] Specifically, the multi-functional safety side door lock also includes a lock opening, with the oblique latch, the center latch, and the square latch corresponding to the lock opening holes on the lock opening.

[0007] Specifically, the inclined locking tongue is made of 30CrMnTiA with a hardness of HRC58-62 and a radius of R30.8mm for the push stroke arc surface; the middle locking tongue is made of 40CrNiMoA with a hardness of HRC40-45 and a push stroke inclined surface angle of 45°±0.5°; and the square locking tongue is made of 20MnTiB with a hardness of HRC60-64 and a cross-sectional dimension of 13×35mm.

[0008] Specifically, the limiting plate I and limiting plate II are made of 60Si2CrVA spring steel with a hardness of HRC48-52. The thickness of limiting plate II is 8.0±0.05mm, and the thickness of limiting plate I is 5.0±0.05mm. The transmission plate is made of 60Si2CrVA spring steel with a hardness of HRC48-52 and a thickness of 5.0±0.05mm. The rotating plate is made of ZG270-500 cast steel with a rotation radius of R35.0mm. The handle and rotor are made of CuZn40Pb2 leaded brass with a latch width of 8.0±0.1mm. The spring is made of SUS316 stainless steel wire.

[0009] Specifically, under a lateral force of 1000N, the total deformation of the lock body box is ≤0.5mm, and the shear force of the oblique locking tongue, the middle locking tongue and the square locking tongue is 15kN; the compressive stress of the square locking tongue limiting groove is ≤70% of the material yield strength.

[0010] This technical solution selects appropriate materials and employs corresponding processing techniques based on the functional requirements of each component, ensuring that each component possesses suitable mechanical properties. This allows for more stable and reliable resistance to various forces during use, guaranteeing the long-term normal operation of the door lock. Specifically, different latches are made of specific materials and processed using appropriate hardness, wear resistance, and other properties. For example, the high hardness of the angled latch adapts to frequent extension and contraction friction, while the moderate hardness of the central latch balances strength and toughness. The limit plate and transmission plate are made of spring steel that has undergone age hardening to ensure elasticity. The rotating plate is made of cast steel and annealed to eliminate stress and improve fatigue resistance. The handle and rotor are made of leaded brass, which facilitates processing and connection. The springs undergo stress relaxation treatment to maintain stable elasticity. Performance requirements such as lock body deformation and latch shear force are addressed to ensure structural stability and reliable latch operation under stress. The synergistic performance of each component ensures the overall function of the door lock.

[0011] Specifically, the multi-functional security side door lock includes three states: When the door is in the automatic locking state, the lock body box moves towards the lock opening, and both the slanted lock tongue and the center lock tongue retract after hitting the lock opening. The center lock tongue drives the limit plate II to rotate, and the limit plate II drives the limit plate I to rotate through the rotating plate. The hook of the limit plate I and the square lock tongue is released, and the square lock tongue is released and popped out by the spring. The bottom of the limit plate I falls into the slot on the upper edge of the square lock tongue. In manual unlocking mode, the handle is rotated to the unlock position via the lock cylinder. The handle drives the transmission plate on the back to move inward towards the lock body, releasing the transmission plate from the constraints on the oblique bolt, center bolt, and square bolt. Handle I or Handle II rotates the rotor 90°. The top of the rotor causes the upper oblique bolt to retract, and the lower part of the rotor causes the lower rotating plate to rotate. The bottom of the rotating plate causes the square bolt to retract. The square bolt retracts to the limit position, and the square bolt causes the limit plate II above it to fall into the slot above it. When in the safe locking state, the handle is rotated to the locked position through the lock cylinder. The handle drives the transmission plate on the back to move outward of the lock body box. The rotor is engaged in the slot of the transmission plate under the action of the spring, locking the position of the transmission plate. The transmission plate then constrains the oblique lock tongue, the center lock tongue and the square lock tongue in sequence to achieve safe locking.

[0012] This technical solution achieves automatic locking when the door is closed, convenient unlocking when manually operated, and secure locking when needed by setting different mechanical transmission and linkage methods, meeting the needs of door lock status in various scenarios and ensuring safety and convenience. Specifically, when automatically locking when the door is closed, the force generated by the collision between the lock body and the lock mouth causes the square and center bolts to retract. Through the connection between the components, the limiting plate rotates, realizing the square bolt popping out and locking. When manually unlocking, rotating the handle moves the transmission plate, releasing the constraint on the bolt. At the same time, the handle drives the rotor to rotate, which retracts the bolt via the rotating plate. In the secure locking state, rotating the handle moves the transmission plate and locks the rotor, and the transmission plate constrains the bolt. The entire process utilizes the shape, positional relationship, and interaction of each component to convert external force into the extension and retraction of the bolt and the rotation of the components, realizing the switching between different states.

[0013] Compared with the prior art, this utility model has the following advantages: The dual handles and the twist handle have clearly defined functions. The locking and unlocking operations of the inner and outer handles are simple and easy to understand. The twist handle can restrain or release multiple bolts at once, greatly improving the convenience of using the door lock. It has three states: automatic locking when closing the door, manual unlocking, and security locking, which can meet the needs of door lock status in different scenarios and make it safe and fast to use. Attached Figure Description

[0014] Figure 1 This is a perspective view of the present invention.

[0015] Figure 2 This is one of the state diagrams of this utility model.

[0016] Figure 3 This is the second state diagram of this utility model.

[0017] Figure 4 This is one of the internal drawings of this utility model.

[0018] Figure 5 This is the second internal view of this utility model.

[0019] In the diagram: 1. Lock body box; 11. Angled bolt; 12. Center bolt; 13. Square bolt; 14. Limiting plate II; 15. Limiting plate I; 16. Rotor; 17. Transmission plate; 18. Rotating plate; 2. Lock opening; 3. Handle I; 4. Twist handle; 5. Handle II; 6. Lock cylinder. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0021] Example 1 like Figures 1 to 5 As shown, this embodiment provides a multi-functional safety side door lock with dual handle operation, including a lock body box 1. The front of the lock body box 1 is provided with a handle I 3 and a torque handle 4, and the back is provided with a handle II 5 and a lock cylinder 6. The lock body box 1 contains a slanted bolt 11, a central bolt 12, and a square bolt 13. The lock body box 1 also contains a limit plate II 14, a limit plate I 15, a transmission plate 17, and a rotating plate 18, wherein: The oblique locking tongue 11, the middle locking tongue 12, and the square locking tongue 13 are arranged sequentially from top to bottom inside the lock body box 1; a limiting plate II 14 is provided between the oblique locking tongue 11 and the middle locking tongue 12, and a limiting contact that cooperates with the middle locking tongue 12 is provided on the limiting plate II 14; a limiting plate I 15 is provided between the middle locking tongue 12 and the square locking tongue 13, and a hook that cooperates with the square locking tongue 13 is provided below the limiting plate I 15; A rotating plate 18 is provided between the limiting plate II 14 and the limiting plate I 15. The lower end of the rotating plate 18 is provided with a limiting hole that cooperates with the limiting post of the square locking tongue 13. The middle part of the rotating plate 18 is provided with a groove that abuts against the limiting plate I 15 and the limiting plate II 14. The top of the rotating plate 18 is provided with a slot that cooperates with the rotor 16. The bottom of the rotor 16 is provided with a slot that mates with the rotating plate 18, and the top of the rotor 16 is provided with a paddle that mates with the oblique locking tongue 11. The paddle is provided with a limiting post that mates with the oblique locking tongue 11. A transmission plate 17 is provided between the square locking tongue 13 and the oblique locking tongue 11. A handle 4 is provided at the bottom of the transmission plate 17. A paddle that cooperates with the transmission plate 17 is provided on the handle 4. The middle part of the transmission plate 17 is connected to the rotating plate 18 through a limiting post. The top of the transmission plate 17 extends into the groove of the oblique locking tongue 11.

[0022] This technical solution utilizes the rational arrangement of components such as the angled latch 11, the central latch 12, the square latch 13, the limiting plate, the transmission plate 17, and the rotating plate 18 within the lock body box 1, and leverages the connections and cooperation between them, such as the fit between the limiting post and the groove / slot. Specifically, the inner and outer handles, through components such as the rotor 16, convert the rotational operation into the extension and retraction of the angled latch 11 and the square latch 13, thus opening the door; the torque handle 4 drives the transmission plate 17 to move, simultaneously constraining or releasing the angled latch 11, the central latch 12, and the square latch 13, completing the locking or unlocking process and achieving multiple functional states. The clear division of labor between the two handles and the torque handle 4 makes operation simple and easy to understand, greatly improving the convenience of using the door lock. This technical solution, through the rational arrangement of the three latches and the mechanical connection and cooperation between the limiting plate, the rotating plate 18, the rotor 16, and the transmission plate 17, converts the rotational motion of the torque handle 4 and the rotor 16 into the linear extension and retraction motion of the latches. The rotating plate 18 is connected to related components through grooves and slots to realize power transmission and direction conversion; the rotor 16 controls its movement through the action of the paddle and the oblique locking tongue 11; the transmission plate 17 connects the torque handle 4 to the rotating plate 18 and the oblique locking tongue 11 to form a complete transmission chain, ensuring that each locking tongue moves according to the predetermined logic. Specifically, the three types of latches are arranged from top to bottom, which facilitates space utilization and functional differentiation; the limiting plate precisely controls the extension and retraction range and direction of the latches through limiting posts, hooks, etc., to prevent excessive movement or misalignment; the rotating plate 18 cooperates with the limiting plate and rotor 16 through grooves and slots to convert the rotation of rotor 16 into the linear motion of the latches; the rotor 16 is linked with the angled latch 11 through a paddle to realize the flexible extension and retraction of the angled latch 11; the transmission plate 17 connects the torque handle 4 with the rotating plate 18 and the angled latch 11, transmitting the rotational force of the torque handle 4 through the rotating plate 18 to drive the angled latch 11 to move, while its own movement is constrained by the limiting posts of the rotating plate 18 to ensure the coordination of all components and realize the stable opening and closing of the door lock.

[0023] Specifically, the multi-functional safety side door lock also includes a lock opening 2, with a slanted latch 11, a central latch 12, and a square latch 13 corresponding to the lock opening holes on the lock opening 2.

[0024] Specifically, the oblique locking tongue 11 is made of 30CrMnTiA with a hardness of HRC58-62 and a radius of R30.8mm for the push stroke arc surface; the middle locking tongue 12 is made of 40CrNiMoA with a hardness of HRC40-45 and a push stroke oblique angle of 45°±0.5°; the square locking tongue 13 is made of 20MnTiB with a hardness of HRC60-64 and a cross-sectional dimension of 13×35mm.

[0025] Specifically, the limiting plate I 15 and limiting plate II 14 are made of 60Si2CrVA spring steel with a hardness of HRC48-52. The thickness of limiting plate II 14 is 8.0±0.05mm, and the thickness of limiting plate I 15 is 5.0±0.05mm. The transmission plate 17 is made of 60Si2CrVA spring steel with a hardness of HRC48-52 and a thickness of 5.0±0.05mm. The rotating plate 18 is made of ZG270-500 cast steel with a rotation radius of R35.0mm. The handle 4 and rotor 16 are made of CuZn40Pb2 leaded brass with a latch width of 8.0±0.1mm. The spring is made of SUS316 stainless steel wire.

[0026] Specifically, under a lateral force of 1000N, the total deformation of the lock body box 1 is ≤0.5mm, and the shear force of the oblique locking tongue 11, the middle locking tongue 12 and the square locking tongue 13 is 15kN; the compressive stress of the limiting groove of the square locking tongue 13 is ≤70% of the material yield strength.

[0027] This technical solution selects appropriate materials and employs corresponding processing techniques based on the functional requirements of each component, ensuring that each component possesses suitable mechanical properties. This allows for more stable and reliable resistance to various forces during use, guaranteeing the long-term normal operation of the door lock. Specifically, different latches are made of specific materials and processed using appropriate hardness, wear resistance, and other properties. For example, the angled latch 11 has high hardness to adapt to frequent extension and contraction friction, while the central latch 12 has moderate hardness, balancing strength and toughness. The limit plate and transmission plate 17 are made of spring steel that has undergone age hardening to ensure elasticity. The rotating plate 18 is made of cast steel and annealed to eliminate stress and improve fatigue resistance. The handle 4 and rotor 16 are made of leaded brass, which facilitates processing and connection. The springs undergo stress relaxation treatment to maintain stable elasticity. Performance requirements such as the deformation of the lock body box 1 and the shear force of the latch are addressed to ensure structural stability and reliable operation of the latch under stress. The synergistic performance of each component ensures the overall function of the door lock.

[0028] Specifically, the multi-functional security side door lock includes three states: When the door is automatically locked, the lock body box 1 moves towards the lock opening 2, and the oblique lock tongue 11 and the middle lock tongue 12 both hit the lock opening and retract. The middle lock tongue 12 drives the limiting plate II 14 to rotate. The limiting plate II 14 drives the limiting plate I 15 to rotate through the rotating plate 18. The hook of the limiting plate I 15 and the square lock tongue 13 is released. The square lock tongue 13 is released and popped out by the spring. The lower part of the limiting plate I 15 falls into the slot on the upper edge of the square lock tongue 13. In the manual unlocking state, the handle 4 is rotated to the unlock position via the lock cylinder 6. The handle 4 drives the transmission plate 17 on the back to move inward to the lock body box 1, releasing the constraint of the transmission plate 17 on the oblique bolt 11, the middle bolt 12 and the square bolt 13. The handle I3 or handle II5 drives the rotor 16 to rotate 90°. The top of the rotor 16 drives the upper oblique bolt 11 to retract, and the lower part of the rotor 16 drives the lower rotating plate 18 to rotate. The bottom of the rotating plate 18 drives the square bolt 13 to retract. The square bolt 13 retracts to the limit position, and the square bolt 13 drives the limit plate I15 above it to fall into the slot above it. When in the safe locking state, the handle 4 is rotated to the locked position through the lock cylinder 6. The handle 4 drives the transmission plate 17 on the back to move outward of the lock body box 1. The rotor 16 is engaged in the slot of the transmission plate 17 under the action of the spring, and the position of the transmission plate 17 is locked. The transmission plate 17 successively constrains the oblique locking tongue 11, the middle locking tongue 12 and the square locking tongue 13 to achieve safe locking.

[0029] This technical solution achieves automatic locking when the door is closed, convenient unlocking when manually operated, and secure locking when needed by setting different mechanical transmission and linkage methods, meeting the needs of door lock status in various scenarios and ensuring safety and convenience. Specifically, when automatically locking when the door is closed, the force generated by the collision between the lock body box 1 and the lock mouth 2 causes the square latch 13 and the middle latch 12 to retract. Through the connection between the components, the limiting plate rotates, realizing the square latch 13 popping out and locking. When manually unlocking, the rotation of the handle 4 drives the transmission plate 17 to move, releasing the constraint on the latch. At the same time, the handle drives the rotor 16 to rotate, which retracts the latch via the rotating plate 18. In the secure locking state, the rotation of the handle 4 moves the transmission plate 17 and locks the rotor 16, and the transmission plate 17 constrains the latch. The entire process utilizes the shape, positional relationship, and interaction of each component to convert external force into the extension and retraction of the latch and the rotation of the components, realizing the switching of different states.

[0030] The usage process of the above embodiments is as follows: like Figures 1 to 5 As shown, when the door needs to be closed, the lock body box 1 gradually moves towards the lock opening 2. During this process, the square bolt 13 and the middle bolt 12 will first strike the lock opening on the lock opening 2. After being impacted, both of them retract into the lock body box 1. When the middle bolt 12 retracts, it drives the limiting plate II 14 to rotate. The limiting plate II 14, through its connection with the rotating plate 18, drives the rotating plate 18 to rotate. The rotating plate 18 further drives the limiting plate I 15 to rotate. As the limiting plate I 15 rotates, its hook with the square bolt 13 is released. The square bolt 13 quickly pops out under the action of the internal spring and inserts into the lock opening of the lock opening 2 to achieve automatic locking. At this time, the lower part of the limiting plate I 15 falls into the slot on the upper edge of the square bolt 13, limiting the position of the bolt and preventing it from popping out or retracting excessively. like Figures 1 to 5As shown, when manual opening is required, first rotate the handle 4 to the unlock position via the lock cylinder 6; rotating the handle 4 will cause the transmission plate 17 on the back to move inward toward the lock body box 1. After the transmission plate 17 moves, it will release the constraints on the oblique bolt 11, the middle bolt 12, and the square bolt 13; then, operate the handle I3 or handle II5 to rotate the rotor 16 90°; the top of the rotor 16 will cause the oblique bolt 11 above to retract via the paddle, and the lower part of the rotor 16 will cause the rotating plate 18 below to rotate, and the bottom of the rotating plate 18 will cause the square bolt 13 to retract; when the square bolt 13 retracts to the limit position, it will cause the limit plate I15 above it to fall into the slot above it, at which point the door can be opened smoothly; like Figures 1 to 5 As shown, when the door needs to be locked securely, the handle 4 is rotated to the locked position via the lock cylinder 6; the rotation of the handle 4 drives the transmission plate 17 on the back to move outward from the lock body box 1, and the rotor 16 is engaged in the slot of the transmission plate 17 under the action of the internal spring, thus locking the position of the transmission plate 17; since the transmission plate 17 is associated with the oblique locking tongue 11, the middle locking tongue 12 and the square locking tongue 13 in sequence, after the position of the transmission plate 17 is locked, it will constrain the oblique locking tongue 11, the middle locking tongue 12 and the square locking tongue 13 in sequence, preventing them from extending or retracting at will, thereby achieving secure locking and ensuring that the door cannot be easily opened in the locked state.

[0031] Although the present invention has been described in detail with reference to the accompanying drawings and preferred embodiments, it is not limited thereto. Various equivalent modifications or substitutions can be made to the embodiments of the present invention by those skilled in the art without departing from the spirit and essence of the present invention, and such modifications or substitutions should all be within the scope of the present invention. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should also be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the scope of the claims.

Claims

1. A multi-functional safety side door lock with dual handle operation, characterized in that, The lock body includes a lock body box (1), with a handle I (3) and a knob (4) on the front and a handle II (5) and a lock cylinder (6) on the back. The lock body box (1) contains a slanted latch (11), a central latch (12), and a square latch (13). The lock body box (1) also contains a limit plate II (14), a limit plate I (15), a transmission plate (17), and a rotating plate (18). The oblique locking tongue (11), the middle locking tongue (12) and the square locking tongue (13) are arranged in the lock body box (1) from top to bottom; a limiting plate II (14) is provided between the oblique locking tongue (11) and the middle locking tongue (12), and a limiting contact that cooperates with the middle locking tongue (12) is provided on the limiting plate II (14); a limiting plate I (15) is provided between the middle locking tongue (12) and the square locking tongue (13), and a hook that cooperates with the square locking tongue (13) is provided below the limiting plate I (15); A rotating plate (18) is provided between the limiting plate II (14) and the limiting plate I (15). The lower end of the rotating plate (18) is provided with a limiting hole that cooperates with the limiting post of the square locking tongue (13). The middle part of the rotating plate (18) is provided with a groove that abuts against the limiting plate I (15) and the limiting plate II (14). The top of the rotating plate (18) is provided with a slot that cooperates with the rotor (16). The bottom of the rotor (16) is provided with a slot that cooperates with the rotating plate (18), and the top of the rotor (16) is provided with a paddle that cooperates with the oblique locking tongue (11), and the paddle is provided with a limiting post that cooperates with the oblique locking tongue (11). A transmission plate (17) is provided between the square locking tongue (13) and the oblique locking tongue (11). A handle (4) is provided at the bottom of the transmission plate (17). A paddle that cooperates with the transmission plate (17) is provided on the handle (4). The middle part of the transmission plate (17) is connected to the rotating plate (18) through a limiting post. The top of the transmission plate (17) extends into the groove of the oblique locking tongue (11).

2. The multi-functional safety side door lock with dual handle operation as described in claim 1, characterized in that, The multi-functional safety side door lock also includes a lock opening (2), a slanted latch (11), a central latch (12) and a square latch (13) which correspond to the lock opening holes on the lock opening (2) respectively.

3. The multi-functional safety side door lock with dual handle operation as described in claim 1, characterized in that, The oblique locking tongue (11) is made of 30CrMnTiA with a hardness of HRC58-62 and a radius of R30.8mm for the push stroke arc surface; the middle locking tongue (12) is made of 40CrNiMoA with a hardness of HRC40-45 and a push stroke oblique angle of 45°±0.5°; the square locking tongue (13) is made of 20MnTiB with a hardness of HRC60-64 and a cross-sectional size of 13×35mm.

4. The multi-functional safety side door lock with dual handle operation as described in claim 1, characterized in that, The limiting plate I (15) and limiting plate II (14) are made of 60Si2CrVA spring steel with a hardness of HRC48-52. The thickness of limiting plate II (14) is 8.0±0.05mm and the thickness of limiting plate I (15) is 5.0±0.05mm. The transmission plate (17) is made of 60Si2CrVA spring steel with a hardness of HRC48-52 and a thickness of 5.0±0.05mm. The rotating plate (18) is made of ZG270-500 cast steel with a rotation radius of R35.0mm. The handle (4) and rotor (16) are made of CuZn40Pb2 leaded brass with a latch width of 8.0±0.1mm. The spring is made of SUS316 stainless steel wire.

5. The multi-functional safety side door lock with dual handle operation as described in claim 1, characterized in that, Under a lateral force of 1000N, the total deformation of the lock body box (1) is ≤0.5mm, and the shear force of the oblique locking tongue (11), the middle locking tongue (12) and the square locking tongue (13) is 15kN; the compressive stress of the limiting groove of the square locking tongue (13) is ≤70% of the material yield strength.

6. The multi-functional safety side door lock with dual handle operation as described in claim 1, characterized in that, The multi-functional safety side door lock includes three states: When the door is automatically locked, the lock body box (1) moves towards the lock opening (2), and the oblique lock tongue (11) and the middle lock tongue (12) both hit the lock opening and retract. The middle lock tongue (12) drives the limit plate II (14) to rotate. The limit plate II (14) drives the limit plate I (15) to rotate through the rotating plate (18). The hook of the limit plate I (15) and the square lock tongue (13) is released, and the square lock tongue (13) is released and popped out by the spring. The bottom of the limit plate I (15) falls into the slot on the upper edge of the square lock tongue (13). In the manual unlocking state, the handle (4) is rotated to the unlock position through the lock cylinder (6). The handle (4) drives the transmission plate (17) on the back to move inward to the lock body box (1), releasing the constraint of the transmission plate (17) on the oblique latch (11), the middle latch (12) and the square latch (13). The handle I (3) or the handle II (5) drives the rotor (16) to rotate 90°. The top of the rotor (16) drives the upper oblique latch (11) to retract. The lower part of the rotor (16) drives the lower rotating plate (18) to rotate. The bottom of the rotating plate (18) drives the square latch (13) to retract. The square latch (13) retracts to the limit position. The square latch (13) drives the limit plate II (14) above it to fall into the slot above it. When in the safe locking state, the handle (4) is rotated to the locked position through the lock cylinder (6). The handle (4) drives the transmission plate (17) on the back to move to the outside of the lock body box (1). The rotor (16) is inserted into the slot of the transmission plate (17) under the action of the spring, and the position of the transmission plate (17) is locked. The transmission plate (17) successively constrains the oblique lock tongue (11), the middle lock tongue (12) and the square lock tongue (13) to perform safe locking.

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