A rear panel of an intelligent door lock

Abstract

This case relates to the rear panel of a smart door lock, including a lock housing. Inside the lock housing are a power supply, a main control circuit board electrically connected to the power supply, and a motor electrically connected to the main control circuit board. The lock housing also houses a main latch and a secondary latch that can extend / retract relative to the lock housing. The motor is connected to the main latch via an integrally molded transmission component, driving the main latch to extend / retract relative to the lock housing. The transmission component is rotatably connected inside the lock housing. A microswitch is installed on the main control circuit board, abutting against the secondary latch. When the door is closed, the secondary latch is pressed into the lock housing by the door panel and touches the microswitch, causing the motor to drive the main latch to extend relative to the lock housing, thus locking the door. This design replaces the traditional multi-stage gear set with an integrally molded transmission component, reducing the number of transmission parts, making the transmission process simpler and smoother, significantly reducing the risk of mechanical jamming and improving transmission reliability. The linkage design between the microswitch and the secondary latch enables the convenience of automatic locking upon closing the door.

Description

Technical Field

[0001] This utility model relates to the field of smart lock technology, specifically to the rear panel of a smart door lock. Background Technology

[0002] In the field of smart locks, especially in external fingerprint lock products, the application of fully automatic lock motors, commonly known as backpack motors, is becoming increasingly widespread. These motors are usually installed inside the back panel of the smart lock and connected to the lock cylinder. They drive the lock body through a lock cylinder lever to achieve the door opening and closing function, greatly improving the automation level of the lock.

[0003] However, the back panels of existing smart locks have several drawbacks. Structurally, their construction is generally quite complex. Taking gear transmission systems as an example, a large number of gears and other components are required to work together to achieve power transmission and function switching. The numerous components not only increase the difficulty and cost of manufacturing but also make the overall structure more bulky, hindering installation and portability.

[0004] Meanwhile, in actual use, this complex structure brings many inconveniences. Opening and closing the door is not convenient, requiring a long time to complete a single action, impacting the user experience. Furthermore, due to the large number of gears and parts, the risk of mechanical jamming is significantly increased. If jamming occurs, the door lock cannot open normally, causing considerable inconvenience to the user.

[0005] Furthermore, prolonged use leads to frequent friction and wear between numerous components, which can easily cause transmission failure. This significantly shortens the lifespan of the smart lock, requiring frequent replacement or repair by users, increasing operating costs and reducing the product's reliability and stability.

[0006] Therefore, overcoming the aforementioned shortcomings has become an important issue that urgently needs to be addressed by those skilled in the art. Utility Model Content

[0007] This invention overcomes the shortcomings of the above-mentioned technologies and provides a rear panel for a smart door lock.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A smart door lock's rear panel includes a lock housing. Inside the lock housing are a power supply, a main control circuit board electrically connected to the power supply, and a motor electrically connected to the main control circuit board. The lock housing also houses a main bolt and a secondary bolt that can extend / retract relative to the lock housing. The motor is connected to the main bolt via an integrally formed transmission component, thereby driving the main bolt to extend / retract relative to the lock housing. The transmission component is rotatably connected inside the lock housing. A microswitch is provided on the main control circuit board, and the microswitch abuts against the secondary bolt. When the door is closed, the secondary bolt is pressed into the lock housing by the door panel and touches the microswitch, causing the motor to drive the main bolt to extend relative to the lock housing, thus locking the door.

[0010] Furthermore, the motor includes an output shaft, the front end of which is provided with a first gear. The transmission component includes a circular boss, a connecting shaft located in the middle of the circular boss, and a lever connected to one side of the circular boss. The upper surface of the circular boss is provided with a toothed groove in the circumferential direction. The first gear meshes in the toothed groove. The other end of the lever abuts against the lower end of the main locking tongue. The connecting shaft has a locking rod connecting hole at the beginning.

[0011] Furthermore, the main locking tongue includes a square tongue and a first connecting rod connected to the lower end of the square tongue. The left side of the first connecting rod has a groove for connecting with a lever. The lever is movably disposed in the groove, and the groove includes limiting grooves arranged symmetrically at the top and bottom.

[0012] Furthermore, a limiting guide structure is provided between the main bolt and the lock housing. The limiting guide structure includes a guide elongated hole opened at the lower end of the main bolt and a pin fixedly connected to the lock housing and inserted into the guide elongated hole.

[0013] Furthermore, a position sensing mechanism is provided between the main lock tongue and the main control circuit board. The position sensing mechanism includes a protrusion on the main lock tongue and a sensor switch located at the lower end of the main control circuit board.

[0014] Furthermore, the lock housing is provided with a guide groove, and the secondary lock tongue includes a triangular tongue and a second connecting rod connected to the lower end of the triangular tongue, with the lower end of the second connecting rod slidably connected in the guide groove.

[0015] Furthermore, a torsion spring is also installed inside the lock housing, located on the right side of the secondary lock tongue. The torsion spring is fixed inside the lock housing by a fixing pin, with one end of the torsion spring abutting against the lock housing and the other end abutting against the secondary lock tongue.

[0016] Furthermore, the main control circuit board is also provided with a first button for starting and stopping the drive motor, and a button is provided on the outside of the lock housing, the button including a button rod that extends into the lock housing and abuts against the upper end of the first button.

[0017] Furthermore, a mechanical knob is provided on the outside of the lock housing, one end of which is connected to a transmission component so as to simultaneously drive the motor and the main bolt.

[0018] Furthermore, the button surface is provided with a first lock / unlock indicator, the outer wall of the lock housing is provided with a second lock / unlock indicator, the lock housing is connected with a pressure plate for fixing the motor, the pressure plate is provided with a recessed rib that abuts against the upper end of the motor, and the main control circuit board is also provided with a second button for resetting the main control circuit board setting program.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] This technical solution replaces the traditional multi-stage gear set with an integrated transmission component, reducing the number of transmission parts, making the transmission process simpler and smoother, significantly reducing the risk of mechanical jamming and improving transmission reliability. The linkage design of the micro switch and the secondary lock tongue triggers the micro switch when the door is closed, which in turn drives the motor to extend the main lock tongue to complete the locking, realizing the convenient function of "automatic locking when the door is closed". This eliminates extra operation steps for users and improves ease of use. The overall solution, through the coordinated operation of the motor, transmission component, main lock tongue and secondary lock tongue, forms a highly efficient and easy-to-operate smart door lock back panel through a simple structural combination. It effectively solves the problems of complex structure, easy damage of parts and inconvenience of opening and closing doors in the existing technology. While improving the user experience, it also enhances the reliability and practicality of the product and extends the service life of the lock. Attached Figure Description

[0021] Figure 1 This is a schematic diagram showing the rear panel circuit board and pressure plate of the smart door lock in this case after they were removed.

[0022] Figure 2 This is a front view of the rear panel of the smart door lock in this case, showing the hidden circuit board and pressure plate.

[0023] Figure 3 This is a schematic diagram of the circuit board structure of the rear panel of the smart door lock in this case.

[0024] Figure 4 This is a rear view of the rear panel of the smart door lock in this case. Detailed Implementation

[0025] The following examples provide a more detailed description of the features and other related characteristics of this utility model, to facilitate understanding by those skilled in the art:

[0026] For ease of description and understanding, please refer to the following descriptions related to positional relationships such as front, back, top, bottom, left, right, outside, and inside in this case. Figure 2 The orientation shown.

[0027] like Figures 1 to 4 As shown, this case discloses a rear panel of a smart door lock, that is, as described in the background art, an external smart lock in the field of smart locks generally includes a rear panel with a motor and a front panel with a lock cylinder. The front panel realizes the functions of mechanical unlocking and connecting to the rear panel, while the rear panel is generally equipped with components such as a motor to realize non-mechanical smart unlocking.

[0028] The rear panel of the smart door lock disclosed in this case includes a lock housing 100. In practice, the lock housing is made of metal, serving as the mounting carrier for all internal components and providing mechanical protection and a dust and water barrier. A power supply 1 is installed inside the lock housing 100. The power supply 1 powers the entire rear panel. In practice, the power supply 1 can be a rechargeable lithium battery or a removable single-cell dry cell battery. In this case, a removable dry cell battery is preferred. To ensure sufficient battery life, four dry cell batteries are provided. Dry cell batteries are convenient for users to remove and replace themselves, while charging lithium batteries is relatively inconvenient when they are depleted. The lock housing 100 also houses a main control circuit board 2 electrically connected to the power supply 1 and a motor 3 electrically connected to the main control circuit board 2. That is, the power supply 1 powers the main control circuit board 2, and the main control circuit board 2 controls the start and stop of the motor 3 through program logic. In practice, the power supply 1, the main control circuit board 2, and the motor 3 are electrically connected via wires. The lock housing 100 also houses a main bolt 4 and a secondary bolt 5 that can extend / retract relative to the lock housing 100. The motor 3 is connected to the main bolt 4 via an integrally formed transmission component 6, which drives the main bolt 4 to extend / retract relative to the lock housing 100. The transmission component 6 is rotatably connected within the lock housing 100. In this case, the transmission component 6 converts the rotational motion of the motor 3 into the linear motion of the main bolt 4. Compared to existing technologies, the transmission component 6 is integrally formed, integrating traditional multi-stage gear sets and linkage mechanisms into a single component, eliminating splicing seams and bolt connections, thus improving the structural stability and durability of the transmission, optimizing the overall structure, and increasing installation efficiency. In practical implementation, the main bolt 4 extends / retracts relative to the lock housing 100, thereby extending / retracting through a hole in the door frame to lock / unlock the door. A microswitch 21 is installed on the main control circuit board 2, and the microswitch 21 abuts against the secondary lock tongue 5. When the door is closed, the secondary lock tongue 5 is pressed into the lock housing 100 by the door panel and touches the microswitch 21, which causes the motor 3 to drive the main lock tongue 4 to extend relative to the lock housing 100, thereby achieving locking. That is to say, the secondary lock tongue 5 is used to detect the closed state of the door and to trigger the microswitch 21 to transmit a signal to the main control circuit board 2. The main control circuit board 2 sends a start signal to the motor 3, thereby driving the motor 3 to drive the transmission component 6 and drive the main lock tongue 4 to extend relative to the lock housing 100, thereby achieving locking. This invention replaces the traditional multi-stage gear set with a single-stage transmission path from the motor 3 to the transmission component 6 to the main lock tongue 4, reducing energy loss and the risk of jamming. The secondary latch 5 touches the micro switch 21, which then transmits a signal to the main control circuit board 2. The main control circuit board 2 then controls the start and stop of the motor 3 in a closed-loop feedback, realizing an automated process of locking the door when it is closed, making locking the door more convenient.

[0029] Specifically, such as Figure 1 , Figure 2As shown, the motor 3 includes an output shaft 31, with a first gear 32 at its front end. The transmission component 6 includes a circular boss 61, a connecting shaft 62 located in the middle of the circular boss 61, and a lever 63 connected to one side of the circular boss 61. The upper surface of the circular boss 61 has circumferentially arranged toothed grooves 611. The first gear 32 meshes in the toothed grooves 611, and the other end of the lever 63 abuts against the lower end of the main locking tongue 4. In specific implementation, as shown in the figure, the meshing of the first gear 32 with the toothed grooves 611 is preferably a worm gear and worm drive, commonly used in the art. Worm gear drives are used to transmit motion and torque between spatially intersecting shafts, and the worm provides a very large transmission ratio in a single mesh. Rotation is smooth with minimal vibration, impact, and noise. Half of the toothed groove is provided along the circular boss to facilitate mechanical limiting of the locking and unlocking stroke. A speed reduction transmission system is formed by the meshing of motor 3 and transmission component 6 via a worm gear. The lever 63 of transmission component 6 and the main bolt 4 form a sliding pushing mechanism, thereby driving the main bolt 4 to move. A lock rod connecting hole 621 is located in the connecting shaft 62. In specific implementation, the lock rod connecting hole 621 is used to connect the lock rod of the mechanical lock cylinder mounted on the door panel or the front panel of the smart lock. The meshing transmission of the worm gear solves the problems of numerous components, cumbersome opening and closing, noise, and transmission efficiency associated with traditional gear sets. The linkage structure between the lever 63 of the lever transmission component 6 and the main bolt 4 simplifies the mechanical transmission chain. The overall solution achieves a deep integration of intelligent and mechanical advantages while maintaining a streamlined structure.

[0030] like Figure 1 , Figure 2 As shown, the main bolt 4 further includes a square tongue 41 and a first connecting rod 42 connected to the lower end of the square tongue 41. A groove 421 connected to a lever 63 is provided on the left side of the first connecting rod 42. The lever 63 is movably disposed in the groove 421, which includes symmetrically arranged upper and lower limiting grooves 4211. The lever 63 moves up and down within the groove 421, thereby causing the main bolt 4 to extend and retract relative to the lock housing 100. When the main bolt 4 is fully extended from the lock housing, the lever 63 is limited in the upper limiting groove 4211; when the main bolt 4 is fully retracted into the lock housing 100, the lever 63 is limited in the lower limiting groove. This design uses double limiting grooves 4211 to form a mechanical hard limit, replacing the traditional sensor-dependent electronic limit, avoiding stroke loss due to circuit failure. Even in extreme situations such as system crashes or electromagnetic interference, the position of the main bolt 4 remains accurate, improving stability. By using the gap fit between the groove 421 and the lever 63, a small amount of movement space is reserved to compensate for assembly errors and component wear, ensuring smooth transmission during long-term use and reducing the risk of jamming.

[0031] Continue as Figure 1 , Figure 2As shown, a limiting guide structure is further provided between the main bolt 4 and the lock housing 100. This limiting guide structure includes a guide hole 43 at the lower end of the main bolt 4 and a pin 101 fixedly connected to the lock housing 100 and inserted into the guide hole 43. The pin and guide hole 43 work together to provide a limiting guide function. When the bolt is fully extended from the lock housing, the pin abuts at the lowermost end of the guide hole 43; when the bolt is fully retracted into the lock housing, the pin abuts at the uppermost end of the guide hole 43. The engagement of the pin 101 and guide hole 43 eliminates the radial degree of freedom of the main bolt 4, precisely controlling its movement stroke and ensuring accurate alignment between the bolt 41 and the lock hole of the door frame, thus preventing jamming or unlocking failures due to deviation.

[0032] Furthermore, a position sensing mechanism is provided between the main bolt 4 and the main control circuit board 2. This mechanism includes a protrusion 44 on the main bolt 4 and a sensor switch 22 located at the lower end of the main control circuit board 2. When the main bolt 4 extends / retracts relative to the lock housing 100, the protrusion 44 can pass through the sensor switch along the movement path of the main bolt 4 to detect the position of the main bolt 4 relative to the lock housing 100, thereby controlling the start and stop of the motor 3. In a specific implementation, there are two sensor switches 22 arranged along the movement path of the main bolt 4. That is, in this embodiment, the main bolt 4 can extend / retract into the lock housing in two stages to sense the two stages of locking / unlocking, thus enhancing security. In a specific implementation, the sensor switch 22 is a photoelectric position detection switch commonly used in the art. By setting up the induction switch 22, the main control circuit board 2 can obtain the position information of the main bolt 4 in real time, realizing closed-loop control and ensuring that each locking and unlocking action can be executed accurately. When the induction switch is not triggered in the expected sequence, or only the first-level switch is triggered but the second-level switch is not triggered, the system can determine that there is a fault and trigger an alarm or automatic retry mechanism. The position sensing mechanism, through the cooperation of the protrusion 44 and the induction switch 22, provides a high-precision and highly reliable position feedback system for the smart lock.

[0033] Reference Figure 1 , Figure 2 As shown, in order to ensure the stability of the movement of the secondary latch 5 relative to the lock housing 100 and to improve the accuracy of the secondary latch 5 touching the micro switch 21, a guide groove 102 is provided on the lock housing 100. The secondary latch 5 includes a triangular tongue 51 and a second connecting rod 52 connected to the lower end of the triangular tongue 51. The lower end of the second connecting rod 52 is slidably connected in the guide groove 102.

[0034] Continue as Figure 1 , Figure 2As shown, further, a torsion spring 7 is installed inside the lock housing 100 on the right side of the secondary latch 5. The torsion spring 7 is fixed inside the lock housing 100 by a fixing pin 103. One end of the torsion spring 7 abuts against the lock housing 100, and the other end abuts against the secondary latch 5. In specific implementation, the fixing pin 103 is vertically welded or riveted to the inner wall of the lock housing 100, providing a fulcrum for the rotation of the torsion spring 7. Under normal conditions, the secondary latch 5 is kept in the extended state by the elastic force, ensuring that the secondary latch 5 can be effectively squeezed by the door panel when the door is closed. After the door panel is removed, the torsion spring 7 drives the secondary latch 5 to achieve precise reset, preparing for the next trigger and improving the stability and consistency of the movement of the secondary latch 5.

[0035] Reference Figures 1-4 As shown, the main control circuit board 2 also has a first button 23 for starting and stopping the drive motor 3, and a button 8 is provided on the outside of the lock housing 100. The button 8 includes a button rod 81 that extends into the lock housing 100 and abuts against the upper end of the first button 23. The first button 23 is integrated into the main control circuit board 2 and is a tactile micro switch. When pressed, it touches the generator 3 in the control circuit. The user can directly drive the motor 3 from the outside of the lock housing 100 by pressing the button 8 to realize the corresponding locking and unlocking functions, which is convenient to use. The button drive mechanism of this invention provides an intuitive and reliable physical operation method for smart locks through a simple mechanical transmission link. While retaining the advantages of electronic control of smart locks, it also takes into account the convenience of traditional mechanical locks, and is especially suitable for emergency operation in special scenarios.

[0036] like Figures 1-4 As shown, to further enhance convenience and stability, and to address situations where the power supply 1 is out of power or the main control circuit board 2 and motor 3 malfunction, preventing unlocking, a mechanical knob 9 is installed on the outside of the lock housing 100. One end of the mechanical knob 9 is connected to the transmission component 6, thereby simultaneously driving the motor 3 and the main bolt 4. By connecting the mechanical knob 9 to the transmission component 6, the rotation of the transmission component 6 relative to the lock housing 100 is controlled. The mechanical knob achieves emergency unlocking of the smart lock through a purely mechanical power chain. When the battery is depleted, the motor 3 malfunctions, or the main control circuit board 2 freezes, the user can directly reverse the drive of the motor 3 and the main bolt 4 using the mechanical knob, avoiding situations where the door cannot be opened or closed, making it more convenient and practical.

[0037] Furthermore, continue as Figures 1-4As shown, a first lock / unlock indicator 82 is provided on the surface of button 8, and a second lock / unlock indicator 104 is provided on the outer wall of lock housing 100. In specific implementation, the first lock / unlock indicator 82 and the second lock / unlock indicator 104 are set using laser engraving or screen printing processes, including icons for "unlock" and "lock," as well as color partitions, with green representing unlock and red representing lock. The surfaces are covered with a transparent wear-resistant coating to effectively prevent long-term wear. By setting the first lock / unlock indicator 82 and the second lock / unlock indicator 104, users can more intuitively observe and perform the corresponding lock / unlock operations, making it more convenient and user-friendly, especially for the elderly and children. A pressure plate 200 for fixing the motor 3 is connected to the lock housing 100, and the pressure plate 200 has a recessed rib 201 that abuts against the upper end of the motor 3. In practice, the pressure plate 200 is fixed to the lock housing 100 by screws, and the protruding rib 201 abuts against the upper end of the motor 3, using the elastic deformation of the metal to generate clamping force, suppressing the axial movement of the motor 3, and ensuring the stability of the motor during operation. When the motor is running, the protruding rib 201 can absorb vibration energy and reduce noise transmission to the surface of the lock housing 100. A second button 24 for resetting the main control circuit board 2's setting program is also provided on the main control circuit board 2. This allows for a forced system reset and restoration to factory settings when the main control circuit board 2 program malfunctions, such as crashes or parameter errors, or when the user needs to reset the main control circuit board 2. This avoids the need for factory repairs and allows the user to operate the system themselves, improving operational convenience and reducing maintenance costs.

[0038] As stated above, this case protects the back panel of a smart door lock, and all technical solutions that are the same as or similar to this case should be considered to fall within the scope of protection of this case.

Claims

1. A rear panel of a smart door lock, comprising a lock housing (100), wherein a power supply (1), a main control circuit board (2) electrically connected to the power supply (1), and a motor (3) electrically connected to the main control circuit board (2) are installed inside the lock housing (100), characterized in that: The lock housing (100) is also equipped with a main latch (4) and a secondary latch (5) that can extend / retract relative to the lock housing (100). The motor (3) is connected to the main latch (4) through an integrally formed transmission component (6) to drive the main latch (4) to extend / retract relative to the lock housing (100). The transmission component (6) is rotatably connected to the lock housing (100). The main control circuit board (2) is equipped with a micro switch (21), which abuts against the secondary latch (5). When the door is closed, the secondary latch (5) is pressed into the lock housing (100) by the door panel and touches the micro switch (21), which can drive the motor (3) to extend the main latch (4) relative to the lock housing (100) to achieve locking.

2. The back panel of the intelligent door lock according to claim 1, characterized in that: The motor (3) includes an output shaft (31), and a first gear (32) is provided at the front end of the output shaft (31). The transmission component (6) includes a circular boss (61), a connecting shaft (62) located in the middle of the circular boss (61), and a lever (63) connected to one side of the circular boss (61). The upper surface of the circular boss (61) is provided with a toothed groove (611) in the circumferential direction. The first gear (32) meshes in the toothed groove (611). The other end of the lever (63) abuts against the lower end of the main locking tongue (4). A locking rod connecting hole (621) is provided in the connecting shaft (62).

3. The back panel of the intelligent door lock according to claim 2, characterized in that: The main locking tongue (4) includes a square tongue (41) and a first connecting rod (42) connected to the lower end of the square tongue (41). The first connecting rod (42) has a groove (421) on its left side that is connected to the lever (63). The lever (63) is movably disposed in the groove (421). The groove (421) includes limiting grooves (4211) arranged symmetrically on the upper and lower sides.

4. The back panel of the intelligent door lock according to claim 1, characterized in that: A limiting guide structure is also provided between the main lock tongue (4) and the lock shell (100). The limiting guide structure includes a guide elongated hole (43) opened at the lower end of the main lock tongue (4) and a pin (101) fixedly connected to the lock shell (100) and inserted into the guide elongated hole (43).

5. The back panel of the intelligent door lock according to claim 1, wherein: A position sensing mechanism is provided between the main locking tongue (4) and the main control circuit board (2). The position sensing mechanism includes a protrusion (44) on the main locking tongue (4) and a sensor switch (22) at the lower end of the main control circuit board (2).

6. The back panel of the intelligent door lock according to claim 1, characterized in that: The lock housing (100) is provided with a guide groove (102), and the secondary lock tongue (5) includes a triangular tongue (51) and a second connecting rod (52) connected to the lower end of the triangular tongue (51). The lower end of the second connecting rod (52) is slidably connected in the guide groove (102).

7. The back panel of the intelligent door lock according to claim 1, characterized in that: The lock housing (100) is also equipped with a torsion spring (7) located on the right side of the secondary lock tongue (5). The torsion spring (7) is fixed inside the lock housing (100) by a fixing pin (103). One end of the torsion spring (7) abuts against the lock housing (100) and the other end abuts against the secondary lock tongue (5).

8. The back panel of the intelligent door lock according to any one of claims 1-7, characterized in that: The main control circuit board (2) is also provided with a first button (23) for starting and stopping the drive motor (3). The lock housing (100) is provided with a button (8), which includes a button rod (81) that extends into the lock housing (100) and abuts against the upper end of the first button (23).

9. The back panel of the intelligent door lock according to claim 8, characterized in that: The lock housing (100) is provided with a mechanical knob (9) on its exterior. One end of the mechanical knob (9) is connected to the transmission component (6) so that it can simultaneously drive the motor (3) and the main lock tongue (4).

10. The back panel of the intelligent door lock according to claim 9, characterized in that: The button (8) has a first lock / unlock indicator (82) on its surface, and the lock housing (100) has a second lock / unlock indicator (104) on its outer wall. The lock housing (100) is connected to a pressure plate (200) for fixing the motor (3). The pressure plate (200) has a recessed rib (201) that abuts against the upper end of the motor (3). The main control circuit board (2) is also provided with a second button (24) for resetting the main control circuit board (2) setting program.

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