Multi-point door lock system

Abstract

A multi-point door lock system features three modes: master lock, multi-point lock, and door open / close. It includes a housing, a door handle rotation module, a door handle lock module, a key lock module, a gear and pinion assembly, a safety switch module, and an outer cover. The key lock module switches the master lock's open / close position. The door handle rotation module synchronously drives the door handle lock module (switching between open / close) and the gear and pinion assembly module, which in turn engage the multi-point lock and multi-point lock modules via gear meshing. The safety switch module uses a spring and a stop slider to limit the gear and pinion assembly, preventing accidental operation and avoiding damage to the door frame from the bolt when locked. The positioning and reset structures of each module employ gear-pinion drive and modular design, offering advantages such as smooth operation, precise reset, strong security protection, convenient assembly and maintenance, and high durability. It is suitable for various types of doors requiring multi-point locking.

Description

Multi-point door lock system Technical Field

[0001] This invention relates to the field of lock technology, specifically referring to a multi-point door lock system that integrates a master lock mode, a top and bottom lock mode, and a door opening and closing mode. It adopts a modular design and a gear-gear linkage mechanism, which features precise transmission, convenient operation, high security, and strong durability. It is suitable for various door structures that require multi-point locking, such as residential and commercial doors. Prior Technology

[0002] Note that, with the increasing demand for security, the combination design of multi-point door locks and main locks has become mainstream. However, existing multi-point door lock systems still have many technical shortcomings: 1. Inappropriate design of linkage mechanism: Traditional multi-point locks often use linkage or chain drive to realize the linkage between the top and bottom locks and the main lock. This type of transmission method is easily affected by installation errors and environmental influences, resulting in wear, deformation or rust, which can lead to linkage jamming, and in severe cases, even the risk of locking failure. 2. Lack of safety anti-accidental activation mechanism: Currently, most products with multi-lock systems rely solely on the main door lock to restrict opening, lacking an independent safety limit mechanism when the door is open. When the door is open, accidental collision with the door handle or misoperation may cause the multi-lock system to lock accidentally, and the bolt may hit the door frame, causing product damage or rebound, posing a safety hazard to personnel. 3. Inconvenient assembly and maintenance: The internal components of traditional multi-point locks are scattered, and there is a lack of unified positioning and limiting structure between modules. The positions need to be repeatedly adjusted during assembly, and disassembly and assembly are difficult during later maintenance, resulting in high maintenance costs.

[0003] In view of this, there is a need for a multi-point door lock system that uses gear-gear meshing transmission as its core, combined with a limit structure and an independent safety switch module, to address the shortcomings of the existing technology and improve the stability, security and practicality of multi-point door locks. Summary of the Invention

[0004] This invention primarily provides a multi-point door lock system, which has a master lock mode, a ground lock mode, and an open / close mode. The multi-point door lock system includes a housing, a door handle rotation module, a door handle lock module, a key lock module, and an outer cover. The housing has a side wall on each of its four sides, and includes a latch opening, a key lock body opening, and a safety lock opening. Its bottom surface has a first rotating positioning post, a second rotating positioning post, a door handle lock limiting post, a first door handle lock limiting groove, and a safety lock sliding groove. The door handle rotation module is disposed within the housing. The door handle rotation module has a rotating body and a first spring. The first spring is disposed on the rotating body, and its two ends abut against the first rotating positioning post and the second rotating positioning post, respectively. The front end of the rotating body is an arc-shaped extension, and the top of the arc-shaped extension has a first actuating part and a second actuating part. A door handle lock module is disposed within the housing and located next to the door handle rotation module. The door handle lock module includes a latch, a door handle lock body, a connector fixing buckle, and a second spring. The latch is fixed to the front end of the door handle lock body through a connector. The connector fixing buckle is installed to the door handle lock body to fix the connector. One end of the second spring is connected to the rear end of the door handle lock body, and the other end of the second spring is connected to the side wall of the housing. One side of the door handle lock body has a first limiting groove, and a door handle lock limiting post passes through the first limiting groove. The rear end of the door handle lock body has a spring limiting post and a stop portion. The door handle rotation module and the door handle lock module are used to switch between an open state and a closed state of the door opening and closing mode. A key lock module, disposed within the housing, includes a key lock body, a key lock actuation body, a linkage, and a third spring. The linkage's two ends are connected to the key lock body and the key lock actuation body, respectively. A first fixing post is located at the connection between the linkage and the key lock body, and the key lock actuation body has a second fixing post. The third spring is connected to the first and second fixing posts. A toothed stop block is located on the bottom surface of the key lock body. The key lock module is used to switch between an unlocked and a locked state of the main door lock mode. An outer cover, disposed on the housing, allows the door handle lock body to move forward by pressing the spring stop post, thereby rotating the latch. When the main door lock is in the unlocked state and the door opening / closing mode is switched to the open state, the rotating body is subjected to an external force and rotates in the opposite direction. The first actuating part touches the abutting part, thereby driving the door handle lock body and the bolt to move backward and compress the second spring to perform the door opening action. Afterward, when the external force on the rotating body disappears, the rotating body rotates in the forward direction and returns to the original state. The door handle lock body is subjected to the restoring force of the second spring and moves forward to the original state.

[0005] In one embodiment of this invention, the multi-point door lock system further includes a first gear module, a second gear module, a safety switch module, a gear module, and a limiting kit. The first gear module is disposed within the housing and located beside the door handle rotation module. The first gear module has an actuating post and a plurality of first teeth at its front end, with a safety lock slot located beside these first teeth. The second gear module is disposed within the housing and located beside the key lock module. The front end of the second gear module has a plurality of second teeth. The safety switch module is disposed within the housing and located between the key lock module and the door handle lock module. The safety switch module includes a safety switch body and a fourth spring. The lower side of the safety switch body has a protruding stop slider disposed in the safety lock sliding groove. One end of the fourth spring is connected to the rear end of the safety switch body, and the other end is connected to the side wall of the housing. The front end of the safety switch body is aligned with the safety lock opening. A gear module is disposed within the housing and located between the first gear row module and the second gear row module, wherein the first teeth and the second teeth mesh with the gear module. A limiting device is disposed on the gear module to restrict the up-and-down movement of the first gear row module and the second gear row module. When the main door lock is in the unlocked state and the door opening / closing mode is switched to the open state, the rotating body rotates in the opposite direction due to external force. The second actuator touches and pushes the actuating column, thereby pushing the first gear module upward. The first teeth drive the gear module to rotate, thereby driving the second gear module downward to enter the unlocked state of the top and bottom lock mode. After the door leaves the door frame, the safety switch body moves forward due to the restoring force of the fourth spring, and drives the stop slider forward to enter the safety lock slot, thereby restricting the movement of the first gear module and the second gear module.

[0006] In summary, the multi-point door lock system disclosed in this work can bring the following benefits: 1. Precise linkage and smooth operation; 2. High level of security protection; 3. Compact structure and strong adaptability; and 4. Highly durable and long service life.

[0007] The following detailed examples will make it easier to understand the purpose, technical content, features and effects of this invention. Simple Explanation of the Diagram

[0008] The first figure is an overall schematic diagram of the multi-point door lock system of this creation. The second figure is a schematic diagram of the door handle rotation and door handle lock module of the multi-point door lock system created in this invention. The third figure is a schematic diagram of the key lock module of the multi-point door lock system created in this invention. Figure 4A is a schematic diagram of the gear rack and gear module of the multi-point door lock system of this invention. Figure 4B is another schematic diagram of the gear rack and gear module of the multi-point door lock system of this invention. The fifth figure is a schematic diagram of the housing of the multi-point door lock system of this invention. The sixth figure is a schematic diagram of the internal components of the multi-point door lock system without top and bottom locks in this creation. The seventh figure is a schematic diagram of the internal components of the multi-point door lock system with a top and bottom lock mode. The eighth figure is a schematic diagram of the modular components of the multi-point door lock system of this creation. The ninth figure is another schematic diagram of the modular components of the multi-point door lock system of this creation. Implementation

[0009] Please refer to Figures 1 to 3, 4A and 4B, and 5 to 9. This invention mainly provides a multi-point door lock system 100, the basic version of which has a master door lock mode and a door opening / closing mode. The multi-point door lock system 100 includes a housing 110, a door handle rotation module 120, a door handle lock module 130, a key lock module 140, and an outer cover 150. The housing 110 has a side wall 111 on each of its four sides, and has a latch opening 112, a key lock body opening 113, and a safety lock opening 114. The bottom surface has a first rotating positioning post 115A, a second rotating positioning post 115B, a door handle lock limiting post 116, a first door handle lock limiting groove 117, and a safety lock sliding groove 119 (as shown in Figure 5). The door handle rotation module 120 is disposed inside the housing 110. The door handle rotation module 120 has a rotating body 122 and a first spring 126. The first spring 126 is disposed on the rotating body 122 and its two ends abut against the first rotating positioning post 115A and the second rotating positioning post 115B, respectively. The front end of the rotating body 122 is an arc-shaped extension 124, and the top end of the arc-shaped extension has a first actuating part 124A and a second actuating part 124B.

[0010] Furthermore, the door handle lock module 130 is disposed within the housing 110 and located next to the door handle rotation module 120. The door handle lock module 130 includes a latch 132, a door handle lock body 134, a connector fixing buckle 133A, and a second spring 136. The latch 132 is fixed to the front end of the door handle lock body 134 through a connector 133. The connector fixing buckle 133A is installed to the door handle lock body to fix the connector 133, and one end of the second spring 136 is connected to the door handle. At the rear end of the lock body 134, the other end of the second spring 136 is connected to the side wall 111 of the housing 110. One side of the door handle lock body 134 has a first limiting groove 134A and the door handle lock limiting post 116 passes through the first limiting groove 134A. The rear end of the door handle lock body 134 has a spring limiting post 137 and a stop part 138. The door handle rotation module 120 and the door handle lock module 130 are used to switch between an open state and a closed state of the door opening and closing mode. The key lock module 140 is disposed within the housing 110. The key lock module 140 includes a key lock body 141, a key lock actuation body 142, a linkage 143, and a third spring 144. The two ends of the linkage 143 are respectively connected to the key lock body 141 and the key lock actuation body 142. The connection between the linkage 143 and the key lock body 141 has a first fixing post 145, and the key lock actuation body 142 has a second fixing post 146. The third spring 144 is connected to the first fixing post 145 and the second fixing post 146. The bottom surface of the key lock body 141 has a toothed limit block 147. The key lock module 140 is used to switch between an unlocked state and a locked state of the main door lock mode.

[0011] Furthermore, the outer cover 150 is disposed on the housing 110, wherein pressing the spring limiting post 137 causes the door handle lock body 134 to move forward, thereby rotating the bolt 132. During the process of switching the door opening / closing mode to the door opening mode when the main door lock mode is in the unlocked state, and the rotating body 122 is subjected to an external force to rotate in the reverse direction, the first actuating part 124A contacts the abutting part 138, thereby driving the door handle lock body 134 and the bolt 132 to move backward and compress the second spring 136 to perform the door opening action. Afterwards, when the external force on the rotating body 122 disappears, the rotating body 122 rotates in the forward direction to return to the original state, and the door handle lock body 134 moves forward to the original state under the restoring force of the second spring 136.

[0012] Furthermore, the multi-point door lock system 100 of this invention also includes a ground lock mode. The multi-point door lock system 100 includes a first gear module 160, a second gear module 170, a safety switch module 180, a gear module 190, and a limit kit 195. The first gear module 160 is disposed within the housing 110 and located beside the door handle rotation module 120. The first gear module 160 has an actuating post 161 (as shown in Figures 4A and 4B), and its front end has a plurality of first teeth 162, with a safety lock slot 163 located beside the first teeth 162. The second gear module 170 is disposed within the housing 110 and located beside the key lock module 140. The front end of the second gear module 170 has a plurality of second teeth 171. The safety switch module 180 is disposed within the housing 110 and located between the key lock module 140 and the door handle lock module 130. The safety switch module 180 includes a safety switch body 181 and a fourth spring 182. The safety switch body 181 has a protruding stop slider 183 on its lower side and is disposed in the safety lock sliding groove 119. One end of the fourth spring 182 is connected to the rear end of the safety switch body 181, and the other end is connected to the side wall 111 of the housing 110. The front end of the safety switch body 181 is aligned with the safety lock opening 114.

[0013] Furthermore, the gear module 190 is disposed within the housing 110 and located between the first gear row module 160 and the second gear row module 170, and the first teeth 162 and the second teeth 171 mesh with the gear module 190. A limiting sleeve 195 is disposed on the gear module 190, which is used to restrict the vertical movement of the first gear row module 160 and the second gear row module 170. When the main door lock is in the unlocked state and the door opening / closing mode is switched to the open state, the rotating body 122 rotates in the opposite direction due to external force. The second actuator 124B touches and pushes the actuating column 161, thereby pushing the first gear module 160 to move upward. The first teeth 162 drive the gear module 190 to rotate, thereby driving the second gear module 170 to move downward to enter the unlocked state of the top and bottom lock mode. The safety switch body 181 moves forward due to the restoring force of the fourth spring 182, and drives the stop slider 183 to move forward and enter the safety lock slot 163, thereby restricting the movement of the first gear module 160 and the second gear module 170, so that the top and bottom lock cannot be locked when the door is opened.

[0014] When the main door lock is in the unlocked state and the door opening / closing mode is switched to the closed state, when the rotating body 122 is subjected to external force and rotates in the forward direction, the first gear module 160 moves downward and drives the gear module 190 to rotate through the first teeth 162, thereby driving the second gear module 170 to move upward and enter the locked state of the top and bottom lock mode.

[0015] Furthermore, the housing 110 includes at least one first limiting member RT1 and at least one second limiting member RT2. The first limiting member RT1 is disposed within the housing 110 and located beside the first toothed column module 160, and the first limiting member RT1 is used to restrict the lateral movement of the first toothed column module 160. The second limiting member RT2 is disposed within the housing 110 and located beside the second toothed column module 170, and the second limiting member RT2 is used to restrict the lateral movement of the second toothed column module 170.

[0016] The following will provide a more detailed explanation of the multi-point door lock system 100 of this invention.

[0017] Regarding the housing 110, the overall structure can be made of one-piece molded wear-resistant engineering plastic (such as ABS resin) or metal (such as metal sheet). The enclosed side walls 111 form an internal installation space, ensuring accurate positioning of each module and preventing dust and foreign object intrusion. Opening design: The latch opening 112 is located on the side of the housing 110, matching the cross-sectional shape of the latch 132 (preferably rectangular), with a gap of no more than 0.5mm, ensuring smooth latch movement and reducing dust entry. The key lock body opening 113 is located on the side of the housing 110, corresponding to the installation position of the key lock body 141, facilitating key insertion. The safety lock opening 114 is located on the side of the housing 110, aligned with the front end of the safety switch body 181, ensuring smooth extension and retraction of the safety switch body 181. Bottom positioning structure: The first rotating positioning post 115A and the second rotating positioning post 115B are symmetrically arranged, equidistant from the rotation center of the rotating body 122, used to position the first spring 126, ensuring uniform force on both ends of the spring. The door handle lock limiting post 116 is a cylindrical protrusion with a diameter matching the width of the first limiting groove 134A, restricting the door handle lock body 134 to only move linearly back and forth. The first door handle lock limiting groove 117 is an elongated slot with a length corresponding to the maximum travel of the door handle lock body 134, ensuring that the spring limiting post 137 does not deviate during movement. The safety lock sliding groove 119 is an elongated recess that matches the cross-sectional shape of the stop slider 183, ensuring that the safety switch body 181 can only move linearly back and forth without lateral deviation.

[0018] Regarding the limiting components: The first limiting component RT1 and the second limiting component RT2 are stop blocks, and the gap between them and the side of the first and second gear modules is no more than 0.3mm, which restricts their lateral movement and ensures precise meshing of the teeth and gears.

[0019] Regarding the door handle rotation module 120, the rotating body 122 can be made of metal or high-strength plastic, with a door handle mounting hole in the center. It is fixed to the door handle via a key connection, ensuring that the rotating body 122 rotates synchronously when the door handle rotates. The arc-shaped extension 124 at the front end is integrally formed with the rotating body 122, and the arc radius matches the rotation center, ensuring the precise movement trajectory of the first and second actuators (124A, 124B). Regarding the actuator design: the first actuator 124A and the second actuator 124B are protrusions at the top of the arc-shaped extension, and the surface can be polished to reduce the friction when in contact with the abutment part 138 and the actuating column 161. The phase difference between the two actuators (124A, 124B) is 90°, ensuring that when the door is opened, the latch 132 is driven to retract first, and then the locking bolt is unlocked, resulting in a reasonable action sequence. The first spring 126 is a torsion spring, which is sleeved on the rotating shaft of the rotating body 122. Its two ends are respectively engaged in the slots of the first rotating positioning post 115A and the second rotating positioning post 115B. In the initial state, it is in a slightly pre-tightened state to ensure that the rotating body 122 can be quickly reset after the external force is released.

[0020] The door handle lock module 130 and the door handle lock body 134 are elongated structures. A first limiting groove 134A is formed along the length, ensuring that the door handle lock body 134 can only move in the forward and backward direction. The latch 132 is a beveled structure with a guide bevel at the front end for automatic engagement when the door is closed. It is fixed to the door handle lock body 134 via a connector 133, which can be pivotally connected by a pin to ensure that the latch 132 can be rotated to adjust its direction (e.g., to adapt to left-opening or right-opening doors). The second spring 136 is a compression spring, initially in a pre-compressed state with a spring force of approximately 5-8N, ensuring that the latch 132 can securely engage with the door frame slot while guaranteeing smooth reset. The spring limiting post 137 is cylindrical with a pressing head at the top for manual pressing to change the latch direction. The abutment part 138 is an arc-shaped stop at the rear end of the door handle lock body 134, which matches the contact surface of the first actuation part 124A to ensure uniform force distribution and avoid local wear.

[0021] The key lock module 140 and key lock body 141 are conventional pin tumbler lock structures, compatible with existing standard keys. The toothed limit block 147 on the bottom surface is a rectangular protrusion that abuts against the side of the first toothed module 160 in the locked state to restrict its movement. In the unlocked state, it disengages from the limit block as the key rotates. The linkage 143 can be a steel connecting rod with pin holes at both ends, pivotally connected to the key lock body 141 and the key lock actuating body 142 through pins to ensure smooth rotation without jamming. The third spring 144 is a tension spring, initially in a stretched state with a spring force of approximately 3-5N, ensuring that when the key is released after rotation, it can drive the linkage 143 and the key lock actuating body 142 to reset, allowing the toothed limit block 147 to re-enter the limit position. The first fixing post 145 and the second fixing post 146 are cylindrical protrusions with hook grooves at the top to fix the two ends of the third spring 144 and prevent the spring from falling off.

[0022] The outer cover 150 is made of the same material as the housing 110. The surface has anti-slip texture and corresponding openings (such as door handle through holes and screw holes). It can be fixed to the housing 110 through multiple Phillips screws. The screw holes can be equipped with anti-loosening structures to ensure a firm installation.

[0023] Regarding the first gear rack module 160 and the second gear rack module 170, their gear rack bodies can be made of metal or engineering plastic. The module of the first tooth 162 and the second tooth 171 is the same as that of the gear module 190 (preferably module 1.5), and the tooth surface can be treated to improve wear resistance. The length of the gear rack corresponds to the travel of the locking mechanism. The actuating column 161 of the first gear rack module 160 is cylindrical, and the contact surface with the second actuating part 124B is spherical to reduce contact stress. The safety lock slot 163 is a rectangular groove that matches the size of the stop slider 183, with a gap of no more than 0.2mm to ensure a firm engagement.

[0024] Regarding the safety switch module 180, the safety switch body 181 has a long strip structure with an operating head at the front end. The lower stop slider 183 is integrally formed with the safety switch body, and its cross-section is T-shaped to match the T-shaped groove of the safety lock sliding groove 119, ensuring precise linear movement. The fourth spring 182 is a compression spring, initially in a pre-compressed state with a spring force of approximately 4-6N, ensuring that when the lock is unlocked, it can quickly extend the safety switch body 181, and the stop slider 183 engages with the safety lock slot 163, restricting the movement of the gear rack.

[0025] Regarding the gear module 190 and the limiting kit 195, the gear module 190 includes a drive gear, which is mounted on the gear positioning pin of the housing 110 via a bearing, allowing for flexible rotation (rotational resistance ≤ 1N). The meshing depth between the gear and the first and second teeth is 2 / 3 of the tooth height, ensuring stable transmission. The limiting kit 195 can be a U-shaped structure, made of engineering plastic, and is placed over the gear module 190 and the gear rack. The gap between the limiting kit 195 and the top surface of the gear rack is 0.3-0.5mm, restricting its vertical movement and ensuring that the teeth and gear always maintain a good meshing state.

[0026] The operating principles of each mode will be explained further below.

[0027] (I) Master Lock Mode: Locked State ↔ Unlocked State

[0028] Locked State (Initial State): The third spring 144 is in a pre-tensioned state, driving the linkage 143 and the key lock actuation body 142 to maintain their initial positions. The toothed limit block 147 of the key lock body 141 is tightly pressed against the side of the first toothed module 160, restricting the movement of the first toothed module 160; since the first toothed module 160 and the second toothed module 170 are linked through the gear module 190, the second toothed module 170 also cannot move, and the top and bottom lock mode remains locked. At this time, even if the door handle is rotated, the second actuation part 124B cannot push the first toothed module 160 to move, but can only drive the bolt 132 to retract (door opening action), but the top and bottom lock is still locked to ensure security.

[0029] Unlocked state: Insert the corresponding key into the key lock body 141 and rotate it 90° clockwise. This causes the linkage 143 to rotate around the rotation center of the key lock body 141, thereby pulling the key lock actuation body 142 to move, and the third spring 144 to be further stretched. As the key rotates, the tooth row limit block 147 disengages from the side of the first tooth row module 160, releasing the limit on the first tooth row module 160. At this time, the main door lock mode switches to the unlocked state, and rotating the door handle can simultaneously unlock the top and bottom locks.

[0030] Reset to locked state: Rotate the key in the opposite direction (90° counterclockwise), the tension of the third spring 144 is released, which drives the linkage 143 and the key lock actuation body 142 to reset, the tooth row limit block 147 abuts against the side of the first tooth row module 160 again, and the main door lock mode returns to the locked state.

[0031] (ii) Door opening / closing mode: Closed state ↔ Open state (Master door lock mode can be locked or unlocked)

[0032] In the closed state (initial state): the second spring 136 is in a pre-compressed state, pushing the door handle lock body 134 and the bolt 132 forward. The bolt 132 extends out of the housing through the bolt opening 112 and locks into the corresponding slot in the door frame. The first limiting groove 134A of the door handle lock body 134 and the door handle lock limiting post 116 are in a relatively stationary state.

[0033] Opening state: Rotating the door handle (applied by external force) causes the rotating body 122 to rotate in the opposite direction (counterclockwise from the door handle mounting end). The first spring 126 is twisted and stores force. The first actuating part 124A of the rotating body 122 rotates accordingly and contacts the abutting part 138 of the door handle lock body 134. Through the pushing force of the contact surface, the door handle lock body 134 is moved backward, the second spring 136 is further compressed, the latch 132 retracts from the door frame slot, and the door can be opened smoothly.

[0034] Reset to the closed position: Release the door handle (external force disappears), the torsional force of the first spring 126 is released, causing the rotating body 122 to rotate clockwise to reset, and the first actuating part 124A disengages from the abutment part 138. The preload of the second spring 136 is released, pushing the door handle lock body 134 forward to reset, the bolt 132 extends again, and the door opening and closing mode returns to the closed position.

[0035] Lock tongue rotation adjustment: When the door opening direction changes (left opening → right opening or vice versa), press the spring limit post 137 to move the door handle lock body 134 forward to the limit position. At this time, the pivot joint between the lock tongue 132 and the connecting piece 133 is rotatable, and the lock tongue (132) can be rotated 180° to the corresponding direction. Release the spring limit post 137, and the door handle lock body 134 returns to its original position under the action of the second spring 136. The lock tongue 132 is then tightened, completing the adjustment.

[0036] (III) Top and Bottom Lock Mode: Locked State ↔ Unlocked State (This mode can only be switched when the main door lock is in the unlocked state)

[0037] Locked State (Initial State): The first gear module 160 is in the low position, and the second gear module 170 is in the high position. The gear module 190 remains stationary, and the locking mechanism (locking rods on the upper and lower parts of the door) extends as the second gear module 170 is in the high position, locking into the corresponding slots on the upper and lower parts of the door frame, thus locking the door in the locked state; the safety switch body 181 is pressed by the first gear module 160 and is in the retracted position, and the fourth spring 182 is compressed.

[0038] Unlocked State: When the master door lock is in the unlocked state, rotating the door handle causes the rotating body 122 to rotate in the opposite direction. The second actuator 124B contacts the actuating post 161 of the first gear module 160 and pushes the first gear module 160 upward. The first tooth 162 meshes with the gear module 190, causing the gear module 190 to rotate clockwise, which in turn causes the second gear module 170, which meshes with the gear module 190, to move downward. The locking mechanism then retracts, disengages from the door frame slot, and switches to the unlocked state. At the same time, after the first gear module 160 moves upward, its safety lock slot 163 aligns with the stop slider 183 of the safety switch body 181. The compression force of the fourth spring 182 is released, causing the safety switch body 181 to move forward. The stop slider 183 is engaged in the safety lock slot 163, restricting the first gear module 160 from moving downward. In turn, the gear linkage restricts the second gear module 170 from moving upward, ensuring that the top and bottom locks remain unlocked and preventing accidental locking.

[0039] Reset to locked state: After closing the door, gently turn the door handle to rotate the rotating body 122 clockwise, causing the second actuator 124B to disengage from the actuating column 161. The safety switch body 181 moves backward due to external force, compressing the fourth spring 182 and disengaging the stop slider 183 from the safety lock slot 163. Furthermore, by manually rotating the rotating body 122 through the door handle, the first gear module 160 moves downward, causing the gear module 190 to rotate counterclockwise, which in turn causes the second gear module 170 to move upward and reset. The locking mechanism then extends again and re-engages in the slot, switching to the locked state.

[0040] In summary, the multi-point door lock system disclosed in this work can bring the following benefits: 1. Precise linkage and smooth operation: The gear-gear meshing transmission replaces the traditional linkage transmission, which has high transmission efficiency and low wear. Each module is equipped with a precise positioning and limit structure to ensure smooth linkage of door opening and unlocking actions without jamming. The spring layout is reasonable, and the reset error of each component after the external force is released is small, resulting in a better user experience. 2. High level of security: Equipped with a master lock and top and bottom lock protection mechanism. When the master lock is locked, the top and bottom locks can be independently restricted from unlocking, avoiding safety hazards caused by misoperation. The safety switch can prevent the top and bottom locks from being accidentally locked due to accidental collision with the door handle or misoperation when the door is open, and prevent the bolt from hitting the door frame, causing product damage or rebound, and injuring personnel. 3. Compact structure and strong adaptability: It adopts a modular design with reasonable layout of each module and small overall size (can be designed to be 20-30mm according to the thickness of the door body), which can be adapted to different types and thicknesses of doors; the components adopt a standardized design, which does not require repeated adjustments during assembly and is convenient to disassemble and assemble during maintenance, reducing production and maintenance costs. 4. High durability and long service life: The core transmission components (gears, gear racks, locking tongues, etc.) are made of wear-resistant materials and are treated with rust prevention and wear resistance, resulting in minimal wear; the springs are made of materials with high elasticity and fatigue life (such as piano wire), and can withstand more than 100,000 repeated cycles, thus extending the product's service life.

[0041] The above description is merely a preferred embodiment of this invention and is not intended to limit the scope of this invention. Therefore, all equivalent variations or modifications made in accordance with the features and spirit described in the claims of this invention should be included within the scope of the patent application.

[0042] 100: Multi-point door lock system 110: Shell 111: Side wall 112: Locking tongue opening 113: Key lock body opening 114: Safety lock opening 115A: First Rotary Positioning Column 115B: Second Rotary Positioning Column 116: Door handle lock limit post 117: First door handle lock limit slot 119: Safety lock sliding groove 120: Door handle rotating module 122: Rotating Body 124: Curved extension 124A: First Actuator 124B: Second Actuator 126: First Spring 130: Door handle lock module 132: Locking tongue 133: Connector 133A: Connector fixing buckle 134: Door handle lock body 134A: First limiting groove 136: The second spring 137: Spring-loaded limit post 138: Reliance Department 140: Key lock module 141: Key lock body 142: Key lock actuation body 143: Linkage components 144: The Third Spring 145: First fixed column 146: Second fixed column 147: Tooth row limit block 150: Outer Cover 160: First gear row module 161: Actuating column 162: First tooth 163: Safety lock slot 170: Second gear module 171: Second tooth 180: Safety switch module 181: Safety switch body 182: The Fourth Spring 183: Stop slider 190: Gear Module 195: Limiting Kit RT1: First limiting component RT2: Second limiting component

Claims

1. A multi-point door lock system having a master door lock mode, a ground door lock mode, and a door open / close mode, the multi-point door lock system comprising: A housing has a side wall on each of its four sides, and a latch opening, a key lock body opening, and a safety lock opening. Its bottom surface has a first rotating positioning post, a second rotating positioning post, a door handle lock limiting post, a first door handle lock limiting groove, and a safety lock sliding groove. A door handle rotating module is disposed within the housing. The door handle rotating module has a rotating body and a first spring. The first spring is disposed on the rotating body, and its two ends abut against the first rotating positioning post and the second rotating positioning post, respectively. The front end of the rotating body is an arc-shaped extension, and the top of the arc-shaped extension has a first actuating part and a second actuating part. A door handle lock module is disposed within the housing and located next to the door handle rotation module. The door handle lock module includes a latch, a door handle lock body, a connector fixing buckle, and a second spring. The latch is fixed to the front end of the door handle lock body through a connector. The connector fixing buckle is installed to the door handle lock body to fix the connector. One end of the second spring is connected to the rear end of the door handle lock body, and the other end of the second spring is connected to the side wall of the housing. One side of the door handle lock body has a first limiting groove, and a door handle lock limiting post passes through the first limiting groove. The rear end of the door handle lock body has a spring limiting post and a stop portion. The door handle rotation module and the door handle lock module are used to switch between an open state and a closed state of the door opening and closing mode. A key lock module is disposed within the housing. The key lock module includes a key lock body, a key lock actuation body, a linkage, and a third spring. The two ends of the linkage are respectively connected to the key lock body and the key lock actuation body. A first fixing post is located at the connection between the linkage and the key lock body, and the key lock actuation body has a second fixing post. The third spring is connected to the first and second fixing posts. A toothed stop block is located on the bottom surface of the key lock body. The key lock module is used to switch between an unlocked state and a locked state of the main door lock mode. An outer cover is disposed on the housing. By pressing the spring-stop post, the door handle lock body moves forward, thereby rotating the bolt. During the process of switching the door lock mode to the unlocked state and the door opening / closing mode to the open state, when the rotating body is rotated in the opposite direction due to external force, the first actuating part touches the abutting part, thereby driving the door handle lock body and the bolt to move backward and compress the second spring to perform the door opening action. Afterward, when the external force on the rotating body disappears, the rotating body rotates in the forward direction to return to the original state, and the door handle lock body moves forward to the original state due to the restoring force of the second spring.

2. The multi-point door lock system as described in claim 1 further includes: A first toothed module is disposed within the housing and located beside the door handle rotation module. The first toothed module has an actuating post and a plurality of first teeth at its front end, with a safety lock slot located beside the first teeth. A second toothed module is disposed within the housing and located beside the key lock module. The front end of the second toothed module has a plurality of second teeth. A safety switch module is disposed within the housing and located between the key lock module and the door handle lock module. The safety switch module includes a safety switch body and a fourth spring. The lower side of the safety switch body has a protruding stop slider disposed in the safety lock sliding groove. One end of the fourth spring is connected to the rear end of the safety switch body, and the other end is connected to the side wall of the housing. The front end of the safety switch body is aligned with the safety lock opening. A gear module is disposed within the housing and located between the first gear rack module and the second gear rack module, wherein the first teeth and the second teeth mesh with the gear module; and a limiting device is disposed on the gear module to restrict the vertical movement of the first gear rack module and the second gear rack module. During the process of switching the door lock mode to the open state while the main door lock is in the unlocked state, when the rotating body is rotated in the opposite direction by an external force, the second actuator touches and pushes the actuating column, thereby pushing the first gear module to move upward, and through the first teeth, drives the gear module to rotate, so as to drive the second gear module to move downward to enter the unlocked state of the top and bottom lock mode. Then, after the door leaves the door frame, the safety switch body moves forward under the restoring force of the fourth spring, and drives the stop slider to move forward and enter the safety lock slot, so as to restrict the movement of the first gear module and the second gear module.

3. The multi-point door lock system as described in claim 2, wherein when the main door lock mode is in the unlocked state and the door opening / closing mode is switched to the closed state, when the rotating body is subjected to an external force and rotates in the forward direction, the first gear module moves downward and drives the gear module to rotate through the first teeth, thereby driving the second gear module to move upward and enter the locked state of the top and bottom lock mode.

4. The multi-point door lock system as described in claim 1, wherein the housing further comprises: At least one first limiting member is disposed inside the housing and located beside the first toothed module, the first limiting member being used to restrict the lateral movement of the first toothed module.

5. The multi-point door lock system as described in claim 1, wherein the housing further comprises: At least one second limiting member is disposed inside the housing and located beside the second toothed module, the second limiting member being used to restrict the lateral movement of the second toothed module.

6. A multi-point door lock system having a master door lock mode, a ground door lock mode, and a door open / close mode, the multi-point door lock system comprising: A housing has a side wall on each of its four sides, and a latch opening, a key lock body opening, and a safety lock opening. Its bottom surface has a first rotating positioning post, a second rotating positioning post, a door handle lock limiting post, a first door handle lock limiting groove, and a safety lock sliding groove. A door handle rotating module is disposed within the housing. The door handle rotating module has a rotating body and a first spring. The first spring is disposed on the rotating body, and its two ends abut against the first rotating positioning post and the second rotating positioning post, respectively. The front end of the rotating body is an arc-shaped extension, and the top of the arc-shaped extension has a first actuating part and a second actuating part. A door handle lock module is disposed within the housing and located next to the door handle rotation module. The door handle lock module includes a latch, a door handle lock body, a connector fixing buckle, and a second spring. The latch is fixed to the front end of the door handle lock body through a connector. The connector fixing buckle is installed to the door handle lock body to fix the connector. One end of the second spring is connected to the rear end of the door handle lock body, and the other end of the second spring is connected to the side wall of the housing. One side of the door handle lock body has a first limiting groove, and a door handle lock limiting post passes through the first limiting groove. The rear end of the door handle lock body has a spring limiting post and a stop portion. The door handle rotation module and the door handle lock module are used to switch between an open state and a closed state of the door opening and closing mode. A key lock module is disposed within the housing. The key lock module includes a key lock body, a key lock actuation body, a linkage, and a third spring. The two ends of the linkage are respectively connected to the key lock body and the key lock actuation body. The connection between the linkage and the key lock body has a first fixing post, and the key lock actuation body has a second fixing post. The third spring is connected to the first fixing post and the second fixing post. The bottom surface of the key lock body has a toothed limiting member. The key lock module is used to switch between an unlocked state and a locked state of the main door lock mode. An outer cover is disposed on the housing. By pressing the spring limiting post, the door handle lock body is moved forward, thereby rotating the lock tongue. A first toothed module is disposed within the housing and located beside the door handle rotation module. The first toothed module has an actuating post, and the front end has multiple first teeth. A safety lock slot is located beside these first teeth. A second toothed module is disposed within the housing and located beside the key lock module, the front end of the second toothed module having a plurality of second teeth; a safety switch module is disposed within the housing and located between the key lock module and the door handle lock module, the safety switch module including a safety switch body and a fourth spring, the lower side of the safety switch body having a protruding stop slider disposed in the safety lock sliding groove, one end of the fourth spring being connected to the rear end of the safety switch body and the other end being connected to the side wall of the housing, wherein the front end of the safety switch body is aligned with the safety lock opening;A gear module is disposed within the housing and located between the first gear row module and the second gear row module, with the first and second teeth meshing in the gear module; and a limiting device is disposed on the gear module to restrict the vertical movement of the first and second gear row modules. During the process of switching the door lock mode from the unlocked state to the open state, when the rotating body is subjected to an external force and rotates in the reverse direction, the first actuating part contacts the abutment part, thereby driving the door handle lock body and the bolt to move backward and compress the second spring to perform the opening action. Afterward, when the external force on the rotating body disappears, the rotating body rotates in the forward direction to return to its original state, and the door handle lock body moves forward to its original state under the restoring force of the second spring.

7. The multi-point door lock system as described in claim 6, wherein during the process of switching the door opening / closing mode to the open state while the main door lock mode is in the unlocked state, when the rotating body is rotated in the opposite direction by an external force, the second actuator touches and pushes the actuating column, thereby pushing the first gear module to move upward, and through the first teeth, drives the gear module to rotate, thereby driving the second gear module to move downward to enter the unlocked state of the top and bottom lock mode. Then, after the door leaves the door frame, the safety switch body moves forward under the restoring force of the fourth spring, and drives the stop slider to move forward and enter the safety lock slot, thereby restricting the movement of the first gear module and the second gear module.

8. The multi-point door lock system as described in claim 6, wherein when the main door lock mode is in the unlocked state and the door opening / closing mode is switched to the closed state, when the rotating body is subjected to an external force and rotates in the forward direction, the first gear module moves downward and drives the gear module to rotate through the first teeth, thereby driving the second gear module to move upward and enter the locked state of the top and bottom lock mode.

9. The multi-point door lock system as described in claim 6, wherein the housing further comprises: At least one first limiting member is disposed inside the housing and located beside the first toothed module, the first limiting member being used to restrict the lateral movement of the first toothed module.

10. The multi-point door lock system as described in claim 6, wherein the housing further comprises: At least one second limiting member is disposed inside the housing and located beside the second toothed module, the second limiting member being used to restrict the lateral movement of the second toothed module.

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