A locking structure for a smart door lock

Abstract

This utility model discloses a locking structure for a smart door lock, belonging to the field of door lock technology. Its structure includes a door lock assembly and a matching door frame. The door lock assembly includes a main latch and a push rod. The main latch has a base box and a secondary latch. The mounting cavity within the secondary latch contains staggered locking components. Each locking component consists of a miniature electric cylinder, a power cone, and a locking rod. The power cone contacts the conical surface of the locking rod. The latch groove has a partition plate and a first fixing hole, and the secondary latch has a second fixing hole. The power cone has a rolling groove, the end of the locking rod has a ball bearing, a return spring is located between the mounting seats, and a guide cylinder and a buffer spring are located at the bottom of the secondary latch. This structure uses a miniature electric cylinder to push the power cone out of the locking rod, forming multi-point locking. This solves the problem of traditional smart door locks lacking an effective locking structure, reduces friction, enhances stability, and ensures door lock security.

Description

Technical Field

[0001] This utility model relates to the field of door lock technology, specifically to a locking structure for an intelligent door lock. Background Technology

[0002] The rapid development of smart home technology has driven the widespread application of smart door locks. With their convenience and intelligent features, smart door locks have become common devices in modern life. They typically consist of an electronic control unit, a mechanical lock body, and a communication module, supporting multiple unlocking methods such as passwords, fingerprints, and mobile apps, significantly improving the convenience of daily life. Their applications are not limited to residential homes but also widely cover hotels, office buildings, apartments, and other locations, making them an important component of modern security systems.

[0003] However, despite the seemingly comprehensive functions integrated into modern smart locks, such as remote control and security alarms, shortcomings still exist in actual anti-theft scenarios. When criminals intentionally damage the lock, existing technical defense systems often struggle to effectively prevent it. For example, attackers can use technical means or force to damage the internal transmission components of the lock body, causing the mechanically linked locking state to instantly fail. Even if the smart lock triggers an alarm and sends an anomaly notification to the user, due to the limitations of traditional structural design, the user cannot perform an emergency locking operation via a mobile app. This renders the lock incapable of proactive defense when attacked, failing to establish a final barrier against illegal intrusion and seriously threatening the property security of residents.

[0004] One of the key reasons for the aforementioned security risks is that conventional smart locks generally lack an effective locking mechanism. Traditional smart locks simply insert the bolt into the bolt slot with the help of the key and the linkage mechanism. Once the linkage mechanism is damaged, the locking relationship between the bolt and the door frame fails, rendering it ineffective in preventing theft. Therefore, to improve the security of smart locks in special circumstances, it is urgent to design a new structure with a reliable locking function to enhance its anti-theft performance and better protect the safety needs of users' homes and property. Utility Model Content

[0005] To address the technical deficiencies in the background technology, this utility model proposes a locking structure for a smart door lock, which solves the aforementioned technical problems and meets practical needs. The specific technical solution is as follows:

[0006] A locking structure for a smart door lock includes a door lock assembly and a door frame that cooperates with the door lock assembly. The door lock assembly includes a main latch and a push rod connected to the main latch at one end. The main latch is provided with a base box and a plurality of sub-latches disposed on one side surface of the base box and distributed at equal intervals. The door frame is provided with a latch groove that cooperates with the main latch. Each sub-latch is provided with a mounting cavity, and a locking assembly is correspondingly disposed in the mounting cavity. The locking assemblies are staggered in the main latch, and one end of each locking assembly is placed in the same base box. Each locking assembly includes a miniature electric cylinder disposed in the base box, a power cone disposed in the mounting cavity of the sub-latch and connected to the telescopic rod of the miniature electric cylinder, and a plurality of locking rods that are symmetrically distributed around the power cone inside the sub-latch. One end of each locking rod is telescopically inserted through the side wall of the sub-latch, and the other end of the locking rod is in contact with the conical surface of the power cone.

[0007] As a further technical solution of this utility model, the inside of the locking tongue groove is provided with a dividing plate for separating the locking tongue, and the dividing plate is provided with a through channel corresponding to the position of the locking rod.

[0008] As a further technical solution of this utility model, the inner wall of the locking tongue groove is provided with a first fixing hole corresponding to the position of the locking rod, and the outer wall of the split locking tongue is provided with a second fixing hole corresponding to and connected to the position of the through channel.

[0009] As a further technical solution of this utility model, the surface of the power cone is provided with a rolling groove corresponding to the position of the locking rod. The end of the locking rod that is in contact with the cone surface of the power cone is provided in the rolling groove and is provided with a freely rolling ball. The ball rolls in the rolling groove as the power cone extends and retracts.

[0010] As a further technical solution of this utility model, the locking rod is provided with an upper and lower opposite mounting seat in the mounting cavity. The mounting seat is fixedly installed on the inner wall of the locking tongue at the end position of the locking rod at one end of the mounting cavity and at the corresponding position where the locking rod penetrates the side wall of the locking tongue.

[0011] As a further technical solution of this utility model, a return spring is provided between the mounting bases of the locking rod, and the return spring is sleeved on the locking rod and its two ends are respectively connected to the corresponding mounting bases.

[0012] As a further technical solution of this utility model, a guide cylinder is provided at the bottom of the locking tongue, and a buffer spring connected to the bottom end of the guide cylinder is provided inside the guide cylinder. A guide rod is connected to the small end of the power cone, and the end of the guide rod away from the power cone is placed inside the guide cylinder.

[0013] The beneficial effects of this utility model are as follows:

[0014] The locking assembly uses a miniature electric cylinder to move a power cone, which pushes the locking lever out of the sub-lock tongue and into the corresponding first and second fixing holes, forming a multi-point locking structure between the lock tongue groove and the main lock tongue. Even if the main lock tongue linkage mechanism is damaged, the locking lever can still work independently, solving the problems of traditional smart door locks lacking an effective locking structure and failing to lock after the linkage mechanism is damaged. The rolling groove on the surface of the power cone cooperates with the ball bearing at the end of the locking lever, reducing friction and making the locking lever move more smoothly, improving the reliability and service life of the structure. The return spring between the locking lever mounting seats can retract the locking lever when locking is not required, without affecting the normal use of the door lock. The guide cylinder and buffer spring at the bottom of the sub-lock tongue guide and buffer the power cone, enhancing the stability of the structure. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 This is a schematic diagram of the door lock assembly structure of this utility model.

[0017] Figure 3 This is a schematic diagram of the locking component structure of this utility model.

[0018] Figure 4 This is a schematic diagram of the power cone structure of this utility model.

[0019] Wherein: 1-Door frame; 11-Lock tongue groove; 12-First fixing hole; 13-Divider plate; 14-Through passage; 2-Door lock assembly; 21-Push rod; 22-Main lock tongue; 221-Base box; 222-Secondary lock tongue; 223-Mounting cavity; 224-Second fixing hole; 23-Locking assembly; 231-Miniature electric cylinder; 232-Power cone; 234-Rolling groove; 235-Guide rod; 236-Locking rod; 2361-Ball bearing; 237-Mounting seat; 238-Reset spring; 239-Guide cylinder; 230-Buffer spring. Detailed Implementation

[0020] The embodiments of this utility model will be described below with reference to the accompanying drawings and related examples. The embodiments of this utility model are not limited to the following examples, and this utility model relates to relevant necessary components in this technical field, which should be regarded as well-known technology in this technical field and can be known and mastered by those skilled in this technical field.

[0021] Combination Figures 1 to 4As shown, a locking structure for a smart door lock includes a door lock assembly 2 and a door frame 1 that cooperates with the door lock assembly 2. The door lock assembly 2 includes a main latch 22 and a push rod 21 connected to the main latch 22 at one end. The main latch 22 is provided with a base box 221 and a plurality of sub-latches 222 disposed on one side surface of the base box 221 and distributed at equal intervals. The door frame 1 is provided with a latch groove 11 that cooperates with the main latch 22. Each sub-latch 222 is provided with a mounting cavity 223, and a locking assembly 23 is correspondingly disposed in the mounting cavity 223. The locking assembly 23 is located on the main latch. The locking components 23 are staggered within the base box 221. One end of each locking component 23 is placed within the same base box 221. Each locking component 23 includes a miniature electric cylinder 231 disposed within the base box 221, a power cone 232 disposed within the mounting cavity 223 of the locking tongue 222 and connected to the telescopic rod of the miniature electric cylinder 231, and a plurality of locking rods 236 arranged symmetrically around the power cone 232 within the locking tongue 222. One end of each locking rod 236 is telescopically inserted through the side wall of the locking tongue 222, and the other end of each locking rod 236 is in contact with the conical surface of the power cone 232.

[0022] When the miniature electric cylinder 231 in the locking assembly 23 of this utility model pushes the power cone 232 to move, the cone surface can push the locking rod 236 out from the sub-lock tongue 222, so that it enters the first fixing hole 12 in the lock tongue groove 11 of the door frame 1 and the second fixing hole 224 on the outer side wall of the sub-lock tongue 222 respectively, forming a multi-point locking structure between the lock tongue groove 11 and the main lock tongue 22. Even if the linkage mechanism of the main lock tongue 22 is damaged, the locking rod 236 can still play a locking role independently, effectively solving the problem that the traditional smart door lock fails to lock due to the lack of a reliable locking structure and the failure of the locking state after the linkage mechanism is damaged, providing a last barrier for security.

[0023] The rolling groove 234 on the surface of the power cone 232 cooperates with the ball bearing 2361 at the end of the locking lever 236. When the power cone 232 extends or retracts, the ball bearing 2361 can roll within the rolling groove 234. This design significantly reduces friction between the power cone 232 and the locking lever 236, making the extension and retraction of the locking lever 236 smoother. It also reduces component wear and significantly improves the reliability and service life of the locking structure. The return spring 238 provided between the locking lever 236 and the mounting base 237 allows the locking lever 236 to retract into the latch 222 when locking is not required, preventing the locking lever 236 from being exposed and affecting the normal opening and closing of the door lock. This design enhances anti-theft performance without interfering with the daily use of the door lock, balancing security and convenience.

[0024] The guide cylinder 239 and buffer spring 230 at the bottom of the locking tongue 222, together with the guide rod 235 at the small end of the power cone 232, can play a precise guiding role when the power cone 232 moves. At the same time, the buffer spring 230 can absorb the impact force when the power cone 232 moves, reduce structural shaking, enhance the stability of the locking assembly 23 when it is working, and make the whole locking process more reliable.

[0025] It should be noted that the "smart door lock" described in this utility model is based on the typical architecture of existing smart door locks, including core components for intelligent control and modules linked with the locking structure. In addition to the locking structure (including the main bolt 22, the secondary bolt 222, the locking component 23, etc.) mentioned above, its overall architecture also includes essential structures such as an electronic control unit (not shown), a communication module (not shown), and an input module (not shown). The electronic control unit integrates a microprocessor and control circuit, and can receive unlocking commands from input modules (such as keypads, fingerprint readers, mobile apps, etc.). It is also electrically connected to the miniature electric cylinder 231 in the locking structure, and is used to send a locking command to the miniature electric cylinder 231 when the smart door lock is subjected to abnormal intrusion (such as violent damage to the door lock, multiple incorrect unlocking, etc.). The communication module supports wireless communication protocols such as Wi-Fi and Bluetooth, and realizes remote data interaction between the door lock and the user's mobile app, such as receiving emergency locking signals triggered by the user, or pushing lock status change notifications to the user.

[0026] As one of the preferred embodiments of this utility model, the locking tongue groove 11 is provided with a partition plate 13 for separating the locking tongue 222, and the partition plate 13 is provided with a through channel 14 corresponding to the position of the locking rod 236.

[0027] Furthermore, in the above structure, the inner wall of the locking tongue groove 11 is provided with a first fixing hole 12 corresponding to the position of the locking rod 236, and the outer wall of the split locking tongue 222 is provided with a second fixing hole 224 corresponding to and connected to the position of the through channel 14.

[0028] The partition plate 13 is set inside the latch groove 11. Its core function is to divide the latch groove 11 into independent areas corresponding to the number of sub-latches 222, so that each sub-latch 222 can be accurately embedded into the corresponding partition space, ensuring that the main latch 22 and the latch groove 11 of the door frame 1 are structurally matched one by one, providing a basic structure for the positioning and locking of the locking rod 236.

[0029] The through-passage 14 extends through the partition plate 13, and its position corresponds exactly to the locking lever 236, providing a guide channel for the movement of the locking lever 236 from the latch 222 towards the door frame 1. This channel not only ensures that the locking lever 236 can accurately pass through the partition plate 13 when extended, but also restricts the movement trajectory of the locking lever 236, preventing it from deviating during operation and ensuring that the locking lever 236 can be accurately aligned with the first fixing hole 12 on the inner wall of the door frame 1.

[0030] The first fixing hole 12 and the second fixing hole 224 are respectively located on the inner wall of the latch groove 11 and the outer wall of the sub-latch 222, and are connected and positioned accordingly through the through channel 14. When the locking rod 236 is pushed out by the power cone 232, one end of it can be inserted into the first fixing hole 12 of the door frame 1, and the other end can be inserted into the second fixing hole 224 of the sub-latch 222 itself, forming a bidirectional fixed connection of "door frame 1-locking rod 236-sub-latch 222". This structure enables the locking rod 236 to establish a multi-point locking relationship between the latch groove 11 and the main latch 22. Even if the linkage mechanism of the main latch 22 is damaged, the locking rod 236 can still firmly fix the main latch 22 in the latch groove 11 through the cooperation of the fixing holes at both ends.

[0031] As one of the preferred embodiments of this utility model, the surface of the power cone 232 is provided with a rolling groove 234 corresponding to the position of the locking rod 236. The end of the locking rod 236 that is in contact with the conical surface of the power cone 232 is provided in the rolling groove 234 and is provided with a freely rolling ball 2361. The ball 2361 performs limited rolling within the rolling groove 234 as the power cone 232 extends and retracts.

[0032] The rolling groove 234 on the surface of the power cone 232 and the ball 2361 at the end of the locking rod 236, in principle, replace traditional sliding friction with rolling friction, realizing low-resistance transmission between the locking rod 236 and the power cone 232. When the micro electric cylinder 231 pushes the power cone 232 to extend or retract, the conical surface of the power cone 232, through the cooperation of the ball 2361 and the rolling groove 234, allows the ball 2361 to roll within the rolling groove 234 along the conical surface trajectory for a limited position. On the one hand, it utilizes rolling friction... The contact significantly reduces the frictional resistance between the power cone 232 and the locking lever 236, making the locking lever 236 move more smoothly when it is pushed out or retracted, and avoiding jamming caused by excessive friction. On the other hand, the limiting effect of the rolling groove 234 on the ball 2361 ensures that the locking lever 236 always moves in the predetermined direction and is accurately aligned with the first fixing hole 12 of the door frame 1 lock tongue groove 11 and the second fixing hole 224 of the split lock tongue 222, ensuring the positioning accuracy of the locking lever 236 when it is extended.

[0033] As one of the preferred embodiments of this utility model, the locking rod 236 is provided with an upper and lower opposite mounting seat 237 in the mounting cavity 223. The mounting seat 237 is fixedly installed on the end position of the locking rod 236 at one end of the mounting cavity 223 and on the inner wall of the sub-locking tongue 222 at the corresponding position where the locking rod 236 penetrates the side wall of the sub-locking tongue 222.

[0034] Furthermore, in the above structure, a return spring 238 is provided between the mounting bases 237 on the locking rod 236. The return spring 238 is sleeved on the locking rod 236 and its two ends are respectively connected to the corresponding mounting bases 237.

[0035] The mounting base 237 of the locking lever 236 and the return spring 238, through the coordinated design of mechanical limiting and elastic reset, achieve stable guidance and automatic reset of the locking lever 236 within the mounting cavity 223. The upper and lower opposing mounting bases 237 are respectively fixed to the end of the locking lever 236 and the inner wall of the latch 222, providing support points at both ends of the locking lever 236, limiting its radial sway, and ensuring that the locking lever 236 can only move linearly along the axial direction. This ensures precise alignment with the first fixing hole 12 of the latch groove 11 of the door frame 1 and the second fixing hole 224 of the latch 222, preventing locking failure due to movement deviation.

[0036] The return spring 238 is sleeved on the locking rod 236 and connected to the mounting bases 237 at both ends. When locked, the miniature electric cylinder 231 pushes the power cone 232 to compress the return spring 238, causing the locking rod 236 to extend and insert into the fixing hole. When locking is not required, the return spring 238 releases its elastic potential energy, pulling the locking rod 236 back into the mounting cavity 223, ensuring that the main lock tongue 22 can pass through the push rod 21 for linkage switch normally, without affecting the daily use of the door lock.

[0037] The above structure not only utilizes the mechanical positioning of the mounting base 237 to ensure the accuracy of the locking lever 236's movement, but also achieves passive triggering and automatic release of the locking function through the elastic force of the return spring 238. While enhancing the anti-theft performance, it also takes into account the ease of use of the door lock, solves the jamming problem and conflict with normal opening and closing that may exist in traditional locking structures, and enables the locking lever 236 to reliably switch between the two states of "extended locking" and "retracted standby", ensuring the stable operation of the smart door lock in different scenarios.

[0038] As one of the preferred embodiments of this utility model, a guide cylinder 239 is provided at the bottom of the locking tongue 222, and a buffer spring 230 connected to the bottom end of the guide cylinder 239 is provided inside the guide cylinder 239. A guide rod 235 is connected to the small end of the power cone 232, and the end of the guide rod 235 away from the power cone 232 is placed inside the guide cylinder 239.

[0039] The guide cylinder 239 at the bottom of the locking tongue 222 and the guide rod 235 of the power cone 232 work together through a combination of mechanical guidance and elastic buffering to achieve stable control of the telescopic movement of the power cone 232. The guide cylinder 239 is fixed to the bottom of the locking tongue 222 and houses the end of the guide rod 235, providing a linear movement channel for the guide rod 235 to be limited. This ensures that the power cone 232, under the push of the miniature electric cylinder 231, can only move precisely along the axial direction of the locking tongue, avoiding the locking rod 236 from being unable to align with the fixing hole due to tilting or offset.

[0040] One end of the buffer spring 230 inside the guide cylinder 239 is connected to the bottom of the cylinder, and the other end forms an elastic contact with the guide rod 235. When the power cone 232 extends to the limit position, the buffer spring 230 can absorb the instantaneous impact force of the miniature electric cylinder 231, preventing rigid collisions from damaging the locking tongue 222 or the power cone 232. At the same time, it provides a certain reset auxiliary force when the power cone 232 retracts, reducing the load on the electric cylinder.

[0041] The aforementioned structure, through the cooperation of guide rod 235 and guide cylinder 239, provides rigid constraint on the movement trajectory of the power cone 232, ensuring the positional accuracy of the locking lever 236 when it is extended. It also utilizes the elastic deformation characteristics of the buffer spring 230 to reduce impact wear between mechanical components, enhancing the structural durability of the locking assembly 23 under high-frequency operation. Especially when the door lock is subjected to external impact or the power cone 232 responds quickly to the locking command, the combination of guide cylinder 239 and buffer spring 230 effectively suppresses vibration, preventing the locking lever 236 from jamming due to the shaking of the power cone 232. This ensures that the locking function can still be reliably triggered under complex working conditions, thereby improving the stability and anti-interference capability of the entire smart door lock locking structure.

[0042] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A deadbolt structure of an intelligent door lock, comprising a door lock assembly (2) and a door frame (1) cooperating with the door lock assembly (2), characterized in that: The door lock assembly (2) includes a main latch (22) and a push rod (21) connected to the main latch (22) at one end. The main latch (22) is provided with a base box (221) and a plurality of sub-latches (222) provided on one side surface of the base box (221) and evenly distributed. The door frame (1) is provided with a latch groove (11) that cooperates with the main latch (22). The sub-latches (222) are provided with a mounting cavity (223). The mounting cavity (223) is provided with a corresponding locking component (23). The locking components (23) are staggered in the main latch (22). One end of the locking assembly (23) is placed in the same base box (221). The locking assembly (23) includes a miniature electric cylinder (231) disposed in the base box (221), a power cone (232) disposed in the mounting cavity (223) of the locking tongue (222) and connected to the telescopic rod of the miniature electric cylinder (231), and a plurality of locking rods (236) distributed symmetrically around the power cone (232) inside the locking tongue (222). One end of the locking rod (236) is telescopically disposed through the side wall of the locking tongue (222), and the other end of the locking rod (236) is in contact with the conical surface of the power cone (232).

2. The lockout structure of claim 1, wherein: The locking tongue groove (11) is provided with a partition plate (13) for separating the locking tongue (222), and the partition plate (13) is provided with a through channel (14) corresponding to the position of the locking rod (236).

3. The lockout structure of claim 2, wherein: The inner wall of the locking tongue groove (11) is provided with a first fixing hole (12) corresponding to the position of the locking rod (236), and the outer wall of the split locking tongue (222) is provided with a second fixing hole (224) corresponding to and connected to the position of the through channel (14).

4. The lockout structure of claim 1, wherein: The surface of the power cone (232) is provided with a rolling groove (234) corresponding to the position of the locking rod (236). The end of the locking rod (236) that is in contact with the conical surface of the power cone (232) is provided in the rolling groove (234) and is provided with a freely rolling ball (2361). The ball (2361) is limited to rolling in the rolling groove (234) as the power cone (232) extends and retracts.

5. The lockout structure of claim 1, wherein: The locking rod (236) is provided with upper and lower mounting seats (237) in the mounting cavity (223). The mounting seats (237) are respectively fixedly installed on the inner wall of the locking tongue (222) at the end position of the locking rod (236) at one end of the mounting cavity (223) and at the corresponding position where the locking rod (236) penetrates the side wall of the locking tongue (222).

6. The lockout structure of claim 5, wherein: The locking lever (236) is provided with a return spring (238) between the mounting bases (237). The return spring (238) is sleeved on the locking lever (236) and its two ends are respectively connected to the corresponding mounting bases (237).

7. The lockout structure of claim 1, wherein: The bottom of the locking tongue (222) is provided with a guide cylinder (239), and a buffer spring (230) connected to the bottom end of the guide cylinder (239) is provided inside the guide cylinder (239). The small end of the power cone (232) is connected with a guide rod (235), and the end of the guide rod (235) away from the power cone (232) is placed inside the guide cylinder (239).

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