An intelligent key box

Abstract

The application relates to an intelligent key box, which comprises a key box body, the key box body comprises a front box body and a rear box body hinged to the front box body, a containing space for containing articles is formed in the front box body, a first lock tongue is mounted on the inner side of the front box body, a second lock tongue which is movably matched with the first lock tongue and used for locking / unlocking the front box body and the rear box body is mounted in the rear box body, a lock tongue hole for inserting the first lock tongue is arranged on the rear box body, an electric driving mechanism connected to the left side of the second lock tongue and used for driving the second lock tongue is further mounted in the rear box body, the electric driving mechanism is connected with the second lock tongue through a first reset mechanism, a mechanical linkage mechanism used for driving the second lock tongue is further connected to the right side of the second lock tongue, and the mechanical linkage mechanism is connected with the second lock tongue through a second reset mechanism. The electric driving mechanism meets the requirement of convenient unlocking of users, and the mechanical linkage mechanism as a backup scheme can effectively cope with scenes such as power shortage and low-temperature circuit failure.

Description

Technical Field

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

[0002] In daily life, keys, as the core unlocking tool for mechanical locks, have long presented challenges in their management. Early users commonly carried mechanical keys on their person, which not only required carrying multiple keys, causing inconvenience, but also made them prone to being lost due to slipping out of pockets or being jostled around, leading to home security risks. This problem is particularly prominent in Europe and America. Many homes in these regions still retain traditional mechanical locks from the original construction period. The lock cylinders of these locks are deeply integrated with the door structure and the home's decor. Replacing them with electronic locks requires modifications to the lock body mounting groove and door thickness; some older homes also require specially sized installation accessories, resulting in extremely high overall renovation costs. Furthermore, the renovation process may damage the original wooden structure or metal coating of the door, affecting the appearance and lifespan of the house. Therefore, users in Europe and America prefer to optimize key management methods while retaining traditional mechanical locks.

[0003] To address the inconvenience of carrying multiple mechanical keys, early mechanical key cases were developed. These key cases could store multiple mechanical keys in one place, and users only needed to carry the key to open the key case, greatly reducing the number of keys they had to carry and improving portability.

[0004] However, as usage demands evolve, the limitations of traditional mechanical key boxes are becoming increasingly apparent. They still rely on physical keys for opening, and the risk of losing the key box itself remains. Therefore, there is an urgent need for a smart key box with multiple actuation methods to address the inconvenience of carrying keys and the incompatibility of existing key boxes with both mechanical and electronic unlocking in regions like Europe and America where traditional mechanical locks are still widely used. This would meet the secure storage needs of keys and small items in different scenarios. Utility Model Content

[0005] This invention overcomes the shortcomings of the above-mentioned technologies and provides an intelligent key box.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A smart key box includes a key box body, which includes a front box and a rear box hinged to the front box. The front box has a storage space for holding items. A first locking bolt is installed inside the front box. A second locking bolt is installed inside the rear box, which cooperates with the first locking bolt to lock / unlock the front box and the rear box. The rear box has a locking bolt hole for inserting the first locking bolt. An electric drive mechanism for driving the second locking bolt is also installed inside the rear box and connected to the left side of the second locking bolt. The electric drive mechanism is connected to the second locking bolt through a first reset mechanism. A mechanical linkage mechanism for driving the second locking bolt is also connected to the right side of the second locking bolt and is connected to the second locking bolt through a second reset mechanism.

[0007] Furthermore, the electric drive mechanism includes a motor and a sector gear connected to the motor. The motor includes a worm gear that meshes with the sector gear. The first reset mechanism is connected to the lower end of the sector gear, and the other end of the first reset mechanism is connected to the second locking tongue to drive the second locking tongue to move.

[0008] Furthermore, the first reset mechanism includes a first torsion spring, which is connected to the rear housing via a first pin. The first torsion spring includes a first leg and a second leg. The first leg is connected to the sector gear via a first connecting hole and moves with the sector gear. The second leg is connected to the second latch via a second connecting hole to drive the second latch to move.

[0009] Furthermore, the mechanical linkage mechanism includes a paddle connected to the second latch and capable of driving the second latch to move downward, a linkage piece abutting against the lower end of the paddle and capable of driving the paddle to move, and a mechanical lock cylinder connected to the lower end of the linkage piece. A groove is provided on the right side of the second latch, and the left side of the paddle is inserted into the groove. The lower end of the paddle is hinged to the rear housing. The second reset mechanism is connected to the lower end of the paddle to drive the paddle to move.

[0010] Furthermore, the second reset mechanism includes a second torsion spring, which includes a third leg and a fourth leg. The third leg is connected to the paddle through a third connecting hole and moves with the paddle. The fourth leg abuts against the lower left end of the paddle.

[0011] Furthermore, the rear housing also contains a circuit board, a power supply, and a fixing seat that presses and fixes the circuit board, the electric drive mechanism, the second locking tongue, and the mechanical linkage mechanism. The fixing seat is provided with a second pin, and the second torsion spring and the paddle are rotatably sleeved on the second pin.

[0012] Furthermore, the circuit board includes a Hall sensor for detecting whether the first latch is engaged in the latch hole and the second latch completes the locking engagement, and a magnet is provided inside the first latch.

[0013] Furthermore, the circuit board includes a button module, a fingerprint recognition module, a card sensing module, and a remote Bluetooth module, and the outer wall of the rear box is equipped with a button panel, a fingerprint recognition head, and a card swiping sensing unit.

[0014] Furthermore, a removable protective cover is installed at the lower end of the rear box, and an indicator is provided on the protective cover. A USB interface is also installed inside the rear box. Opening the protective cover exposes the USB interface and the keyhole of the mechanical lock cylinder.

[0015] Furthermore, a detachable hook is connected to the upper end of the front box, and screws for installation and fixing are connected to the front wall of the front box.

[0016] Compared with the prior art, the beneficial effects of this utility model are: This application addresses users' needs for convenient and efficient unlocking through an electric drive mechanism. Combined with a mechanical linkage mechanism as a backup, it effectively handles scenarios such as insufficient power and low-temperature circuit failures, effectively mitigating the risk of key box failure under a single drive method. It is particularly suitable for users in Europe and America who retain many traditional mechanical locks and require high stability in key retrieval, significantly improving product reliability and providing users with multiple convenient, reliable, and efficient unlocking methods. Secondly, the design of the first and second reset mechanisms ensures that the second bolt automatically resets and remains extended after unlocking, while also allowing the storage and release of elastic potential energy through the pressure of the first bolt during closing, automatically ejecting and locking the second bolt. This eliminates the need for manual alignment of the bolt, achieving one-click closing and locking of the key box, completely resolving the problems of sluggish opening and closing and cumbersome operation in existing products, and extending the lifespan of the key box. Attached Figure Description

[0017] Figure 1 This is an exploded view of the overall structure of the smart key box in this case.

[0018] Figure 2 This is a partial structural diagram of the rear box in this case.

[0019] Figure 3 This is a structural schematic diagram of the fixed base in this case.

[0020] Figure 4 This is a schematic diagram of the circuit board in this case.

[0021] Figure 5 This is a 3D view of the smart key box in this case. Detailed Implementation

[0022] 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: For ease of description and understanding, please refer to the attached diagram for descriptions related to positional relationships such as front, back, top, bottom, left, right, outside, and inside in this case.

[0023] like Figures 1 to 5 As shown, this invention provides a smart key box, including a key box body 100, which includes a front box 101 and a rear box 102 hinged to the front box 101. In specific implementation, the key box body 100 is generally rectangular in shape. The hinged design of the front box 101 and the rear box 102 ensures smooth opening and closing of the box, facilitating user access to items. The front box 101 has a storage space 1011 for accommodating keychains, cards, or other small, hard-to-carry or valuable items. A first locking bolt 1 is installed inside the front box 101, and a second locking bolt 2 is installed inside the rear box 102, which movably engages with the first locking bolt 1 to lock / unlock the front box 101 and the rear box 102. The rear box 102 has a locking bolt hole 1021 for the first locking bolt 1 to be inserted. The first locking tongue 1 is inserted into the rear housing 102 through the locking tongue hole 1021, and cooperates with the second locking tongue 2 to achieve locking / unlocking between the front and rear housings. In this embodiment, the upper end of the second locking tongue 2 is shaped like a triangle, and a groove of the same shape as the triangle of the second locking tongue 2 is formed at the lower part of the first locking tongue 1 for the second locking tongue 1 to insert into. The two achieve precise locking through the cooperation of the triangle and the groove. This design is not only simple in structure, but also secure in locking, effectively preventing the key box from accidentally opening due to vibration and causing internal items to fall out, solving the problems of loose buckles and unreliable locking in existing products. An electric drive mechanism 3 for driving the second locking tongue 2 is also installed inside the rear housing 102, connected to the left side of the second locking tongue 2. The electric drive mechanism 3 is connected to the second locking tongue 2 through the first reset mechanism 4. By electrically driving the second locking tongue 2 to move, the key box is electrically unlocked / locked, providing users with a convenient and efficient unlocking method without the need for a physical key, avoiding the inconvenience of carrying an extra key for traditional mechanical key boxes. On the right side of the second latch 2, there is also a mechanical linkage mechanism 5 for driving the second latch 2. The mechanical linkage mechanism 5 is connected to the second latch 2 through the second reset mechanism 6. The mechanical linkage mechanism 5 is a backup solution for electric drive. It drives the second latch 2 to move by operating the mechanical key to achieve unlocking / locking. When the electric drive mechanism 3 fails due to insufficient power, low temperature failure, etc., it can still open the key box normally, thus solving the pain point of not being able to retrieve the key in the case of battery depletion, motor failure, etc., and greatly improving product reliability.

[0024] As described above, this invention achieves multi-mode unlocking of the key box through both electric and mechanical means. Furthermore, the first reset mechanism 4 and the second reset mechanism 6 ensure that the second latch 2 automatically resets and remains extended after unlocking, allowing the front box 101 to easily and automatically lock together with the rear box 102 when the front box 101 closes towards the rear box 102. In other words, through the first reset mechanism 4 and the second reset mechanism 6, when the front box 101 closes towards the rear box 102, the second latch 2 is pushed into the rear lock body by the front end of the first latch 1, storing elastic potential energy. This elastic potential energy is released when the second latch 2 moves to the engaging position of the first latch 1, and the second latch 2 automatically pops out to lock with the first latch 1. The locking engagement can be a hook engagement, a snap engagement, or a protrusion and groove engagement, among other locking methods. The electric drive mechanism 3 electrically drives the second latch 2 to perform locking or unlocking operations, providing users with a convenient and efficient electric unlocking method. The mechanical linkage mechanism 5 serves as a backup, ensuring that users can still mechanically open the key box in the event of insufficient power or malfunction, thus enhancing the product's reliability and practicality. The use of the first reset mechanism 4 and the second reset mechanism 6 simplifies the locking / unlocking process, making the key box's closing and opening smoother.

[0025] Specifically, such as Figure 1 , Figure 2 As shown, the electric drive mechanism 3 of this case includes a motor 31 and a sector gear 32 connected to the motor 31. The motor 31 includes a worm gear 311, which meshes with the sector gear 32, thereby driving the sector gear 32 to move through the motor 31. A first reset mechanism 4 is connected to the lower end of the sector gear 32, and the other end of the first reset mechanism 4 is connected to the second locking tongue 2 to drive the second locking tongue 2 to move.

[0026] In practice, the motor 31 rotates, driving the worm gear 311 to rotate. The worm gear 311 drives the sector gear 32 to move, and the movement of the sector gear 32 drives the first reset mechanism 4 to move, thereby driving the second latch 2 to move downward to unlock. After the elastic potential energy is released, the second latch 2 automatically pops out. The second latch 2 automatically resets under the action of the first reset mechanism 4. This electric drive mechanism 3 design utilizes the transmission principle of the motor 31, worm gear 311, and sector gear 32 to achieve precise control of the second latch 2. The motor 31, as the power source, transmits the rotational motion to the sector gear 32 through the worm gear 311. The sector gear 32 then drives the first reset mechanism 4 to move, thereby driving the second latch 2 to perform locking or unlocking operations. The entire process is smooth and efficient, greatly improving the intelligence level of the key box. At the same time, the use of the first reset mechanism 4 ensures that the second latch 2 can quickly reset after unlocking, preparing for the next locking operation, achieving an automatic locking effect and improving the convenience of operation.

[0027] Continue to refer to Figure 1 , Figure 2 As shown, the first reset mechanism 4 includes a first torsion spring 41, which is connected to the rear housing 102 via a first pin 42. That is, the first torsion spring 41 is sleeved on the first pin 42 to ensure that the middle part of the first torsion spring 41 can rotate around the first pin 42, thus ensuring the stability of the first torsion spring 41's movement. The first torsion spring 41 includes a first support leg 411 and a second support leg 412. The first support leg 411 is connected to the sector gear 32 via a first connecting hole 321 and moves with the sector gear 32. The second support leg 412 is connected to the second locking tongue 2 via a second connecting hole 21 to drive the second locking tongue 2 to move.

[0028] In practical implementation, when the sector gear 32 rotates, the first torsion spring 41 moves along with the first support leg 411, driving the first torsion spring 41 to rotate freely around the first pin 42. Since there are no other parts to restrain it, this causes the second support leg 412 to rotate as well, driving the second latch 2 to extend and retract. Simultaneously, due to the elasticity of the first torsion spring 41, a restoring force is generated. This restoring force is transmitted to the second latch 2 through the second support leg 412, driving the second latch 2 to perform corresponding movements. After unlocking, the motor's driving force is lost, and the free rotation of the first torsion spring 41 around the first pin 42 causes the second latch 2 to automatically reset, preparing for the next locking. This design of the first reset mechanism 4 is simple yet highly effective, reliably realizing the reset function of the second latch 2 and ensuring the stability and continuity of the smart key box's unlocking and locking process.

[0029] Furthermore, continue to refer to Figure 1 , Figure 2As shown, the mechanical linkage mechanism 5 of this case includes a paddle 51 connected to the second latch 2 and capable of driving the second latch 2 to move downward, a linkage plate 52 abutting against the lower end of the paddle 51 and capable of driving the paddle 51 to move, and a mechanical lock cylinder 53 connected to the lower end of the linkage plate 52. In specific implementation, when the user inserts the key into the mechanical lock cylinder 53 and rotates the mechanical key, it can drive the linkage plate 52 to move upward. The linkage plate 52 abuts against the right side of the paddle 51, causing the right side of the paddle 51 to move upward. Thus, through the hinge between the paddle 51 and the rear housing 102, the left side of the paddle 51 moves downward, thereby driving the second latch 2 to move downward to achieve unlocking. After unlocking, the elastic potential energy of the second reset mechanism 6 is released, and the second latch automatically pops out. Among them, a groove 22 is provided on the right side of the second latch 2, and the left side of the paddle 51 is inserted into the groove 22 to ensure the stability of the transmission connection between the paddle 51 and the second latch 2. The lower end of the lever 51 is hinged to the rear housing 102, and the second reset mechanism 6 is connected to the lower end of the lever 51 to drive its movement. The mechanical linkage mechanism 5 in this invention enables the key box to be opened even without power. Users can simply rotate the mechanical key to drive the linkage plate 52, which in turn moves the lever 51, ultimately unlocking the second latch 2. This process not only retains the familiar feel of traditional mechanical locks but also provides a reliable backup unlocking method for users in case of power failure or when power is unavailable. Simultaneously, the second reset mechanism 6 ensures that the second latch 2 can quickly and accurately reset after unlocking, providing a guarantee for the next locking operation and further enhancing the practicality and stability of the key box. Furthermore, the mechanical linkage mechanism 5 and the electric drive mechanism 3 are independent yet complementary, together forming a dual-drive system for the smart key box, providing users with more comprehensive and flexible unlocking options.

[0030] Continue to refer to Figure 1 , Figure 2As shown, specifically, the second reset mechanism 6 includes a second torsion spring 61, which includes a third leg 611 and a fourth leg 612. The third leg 611 is connected to the paddle 51 through a third connecting hole 511 and moves with the paddle 51. The fourth leg 612 abuts against the lower left end of the paddle 51. The structure and principle of the second reset mechanism 6 are similar to those of the first reset mechanism 4. For parts not mentioned in this case, please refer to the corresponding description of the first reset mechanism 4 in this case. In specific implementation, when the paddle 51 moves due to the drive of the mechanical linkage mechanism 5, the third leg 611 of the second torsion spring 61 will move accordingly. Since the fourth leg 611 abuts against the lower left end of the paddle 51, this movement will cause the second torsion spring 611 to deform and store elastic potential energy. After the lever 51 completes the unlocking action by driving the second latch 2, the elastic potential energy stored in the second torsion spring 61 is quickly released, pushing the lever 51 and the second latch 2 to automatically reset, ensuring that the key box can be locked smoothly the next time it is used. This structure not only improves the ease of use of the key box, but also effectively buffers the impact force during the mechanical linkage process through the elastic action of the second torsion spring 61, extending the service life of the key box. At the same time, the setting of the second torsion spring 61 also allows the mechanical linkage mechanism 5 to independently complete the reset action of the second latch 2 without external power.

[0031] Reference Figures 1-4 As shown, furthermore, a circuit board 600, a power supply 7, and a fixing seat 8 that presses and fixes the circuit board 600, the electric drive mechanism 3, the second locking tongue 2, and the mechanical linkage mechanism 5 are also installed inside the rear housing 102. In specific implementation, the circuit board 600 is responsible for receiving and processing signals from the electric drive mechanism 3 and the mechanical linkage mechanism 5 to achieve intelligent control. The power supply 7 provides power support for the entire key box, ensuring that the electric drive mechanism can work normally. In specific implementation, the power supply 7 is a battery box, which contains a removable and replaceable battery. The fixing seat 8 presses and fixes the components of the circuit board, the motor drive mechanism 3, the second locking tongue 2, and the mechanical linkage mechanism 5 together, which not only simplifies the installation process but also improves the overall structural stability of the key box. In specific implementation, a cavity 82 is formed on the fixing seat 8 for accommodating and limiting the installation of the above-mentioned components. A second pin 81 is provided on the fixing seat 8, and the second torsion spring 61 and the paddle 51 are rotatably sleeved on the second pin 81. The second pin 81 provides a stable pivot point for the second torsion spring 61 and the paddle 51, enabling them to rotate flexibly during mechanical linkage and achieve precise control of the second locking tongue 2.

[0032] Furthermore, referring to Figure 1 , Figure 2 , Figure 4As shown, the circuit board 600 also includes a Hall sensor 601 for detecting whether the first locking tongue 1 is engaged in the locking tongue hole 1021 and locked with the second locking tongue 2. A magnet is installed inside the first locking tongue 1. In practice, the Hall sensor 601 can accurately sense changes in the magnetic field of the magnet inside the first locking tongue 1. When the first locking tongue 1 is successfully engaged in the locking tongue hole 1021 and locked with the second locking tongue 2, the Hall sensor 601 detects a magnetic field signal and transmits this signal to the control system on the circuit board 600. The system then determines that the key box is locked. If no suitable magnetic field signal is received during the detection process, the system determines that the key box is not properly locked and triggers a corresponding prompt mechanism, such as sounding an alarm, flashing an indicator light, or sending information to the user's mobile app. This Hall sensor 601 significantly improves the security and reliability of the smart key box, allowing users to promptly understand the locking status of the key box and avoid security risks caused by unlocking.

[0033] Continue to refer to Figure 1 , Figure 2 , Figure 4 As shown, the circuit board 600 further includes a button module 602, a fingerprint recognition module, a card sensing module, and a remote Bluetooth module. The outer wall of the rear housing 102 is equipped with a button panel 1022, a fingerprint recognition head 1023, and a card swiping sensor 1024. In specific implementations, the button module 602 provides users with the option of manual operation. Users can open the smart key box by pressing the corresponding button on the button panel 1022 using a digital password. The fingerprint recognition module utilizes advanced fingerprint recognition technology. Users only need to place their pre-recorded fingerprint on the fingerprint recognition head, and the system can quickly and accurately recognize the fingerprint information, automatically unlocking the key box after confirming identity. This unlocking method is not only convenient and fast but also extremely secure, effectively preventing unauthorized opening. The card sensing module allows users to use specific cards, such as access cards or proximity cards, to simply swipe them on the card swiping sensor to complete identity verification and unlock the key box. It is suitable for various scenarios, providing users with diverse unlocking methods. The remote Bluetooth module enables the smart key box to be remotely controlled. Users can establish a Bluetooth connection with the key box using Bluetooth-enabled devices such as mobile phones, and then remotely control it using a dedicated application. Within a certain controllable distance, as long as there is a network and Bluetooth signal, the key box can be easily managed, greatly improving the convenience and flexibility of use. These modules are integrated on the circuit board 600 and work together to provide users with a diverse, easy-to-use, safe and reliable smart key box.

[0034] Furthermore, referring to Figure 1 , Figure 2 , Figure 5As shown, a removable protective cover 1025 is also installed at the lower end of the rear housing 102. The protective cover 1025 has an indicator label 10251. A USB interface 1026 is also installed inside the rear housing 102. Opening the protective cover 1025 exposes the USB interface 1026 and the keyhole 531 of the mechanical lock cylinder 53. In practice, the USB interface 1026 is used to charge the power supply. The indicator labels include a USB indicator and a mechanical key unlocking indicator 10251. When the power supply is low, the user can open the protective cover 1025 via the indicator label 10251, locate the USB interface, and use a suitable charging cable to connect the power supply to an external charging device for charging.

[0035] The mechanical key unlocking indicator provides clear operational guidance when users need to unlock the lock mechanically, helping them quickly locate the keyhole 531 of the mechanical lock cylinder 53, insert the key, and rotate it to unlock. This removable protective cover 1025 effectively protects the USB interface 1026 and the keyhole of the mechanical lock cylinder from dust and debris, preventing them from affecting normal use, while also conveniently exposing the relevant components when needed, making operation easy.

[0036] Finally, please refer to Figure 1 , Figure 5 As shown, a detachable hook 9 is connected to the upper end of the front box 101, and screws 1012 for installation and fixation are connected to the front wall of the front box 101. In practice, the hook 9 can hang the key box in the place where the user needs it, such as on the door lock, door handle, tree branch, fence, etc. When the user does not need to use the hook 9 installation method, the hook 9 can be removed, and the key box can be directly installed and fixed to the door panel or wall by the screws 1012, providing the user with multiple installation methods. In practice, there are four screws 1012 symmetrically arranged in pairs along the four corners of the front box. This combination of detachable hook 9 and screw 1012 installation methods fully considers the user's needs in different scenarios. The hook 9 installation method is flexible and convenient, suitable for temporary hanging or relatively open spaces. Users can quickly adjust the hanging position of the key box according to the actual situation for easy access to the key. The screw installation method is more stable and suitable for long-term fixation to hard surfaces such as door panels or walls, ensuring that the key box will not easily shake or fall off during use.

[0037] As stated above, this case protects a smart key box, 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 smart key box, comprising a key box body (100), the key box body (100) including a front box body (101) and a rear box body (102) hinged to the front box body (101), wherein the front box body (101) has a receiving space (1011) for receiving items, characterized in that: The front box (101) is equipped with a first locking tongue (1) inside. The rear box (102) is equipped with a second locking tongue (2) that works with the first locking tongue (1) to lock / unlock the front box (101) and the rear box (102). The rear box (102) is provided with a locking tongue hole (1021) for the first locking tongue (1) to be inserted. The rear box (102) is also equipped with an electric drive mechanism (3) connected to the left side of the second locking tongue (2) for driving the second locking tongue (2). The electric drive mechanism (3) is connected to the second locking tongue (2) through a first reset mechanism (4). The right side of the second locking tongue (2) is also connected with a mechanical linkage mechanism (5) for driving the second locking tongue (2). The mechanical linkage mechanism (5) is connected to the second locking tongue (2) through a second reset mechanism (6).

2. The smart key box according to claim 1, characterized in that: The electric drive mechanism (3) includes a motor (31) and a sector gear (32) connected to the motor (31). The motor (31) includes a worm (311) and the worm (311) meshes with the sector gear (32). The first reset mechanism (4) is connected to the lower end of the sector gear (32), and the other end of the first reset mechanism (4) is connected to the second locking tongue (2) to drive the second locking tongue (2) to move.

3. The smart key box according to claim 2, characterized in that: The first reset mechanism (4) includes a first torsion spring (41), which is connected to the rear housing (102) via a first pin (42). The first torsion spring (41) includes a first leg (411) and a second leg (412). The first leg (411) is connected to the sector gear (32) via a first connecting hole (321) and moves with the sector gear (32). The second leg (412) is connected to the second latch (2) via a second connecting hole (21) to drive the second latch (2) to move.

4. The smart key box according to claim 1, characterized in that: The mechanical linkage mechanism (5) includes a paddle (51) connected to the second latch (2) and capable of driving the second latch (2) to move downward, a linkage piece (52) abutting the lower end of the paddle (51) and capable of driving the paddle (51) to move, and a mechanical lock cylinder (53) connected to the lower end of the linkage piece (52). A groove (22) is provided on the right side of the second latch (2), and the left side of the paddle (51) is inserted into the groove (22). The lower end of the paddle (51) is hinged to the rear housing (102). The second reset mechanism (6) is connected to the lower end of the paddle (51) to drive the paddle (51) to move.

5. A smart key box according to claim 4, characterized in that: The second reset mechanism (6) includes a second torsion spring (61), which includes a third leg (611) and a fourth leg (612). The third leg (611) is connected to the paddle (51) through a third connecting hole (511) and moves with the paddle (51). The fourth leg (612) abuts against the lower left side of the paddle (51).

6. A smart key box according to claim 5, characterized in that: The rear housing (102) also contains a circuit board (600), a power supply (7), and a fixing seat (8) that presses and fixes the circuit board (600), the electric drive mechanism (3), the second locking tongue (2), and the mechanical linkage mechanism (5). The fixing seat (8) is provided with a second pin (81), and the second torsion spring (61) and the paddle (51) are rotatably sleeved on the second pin (81).

7. A smart key box according to claim 6, characterized in that: The circuit board (600) includes a Hall sensor (601) for detecting whether the first latch (1) is engaged in the latch hole (1021) and the second latch (2) to complete the locking engagement. A magnet is provided inside the first latch (1).

8. A smart key box according to claim 7, characterized in that: The circuit board (600) includes a button module (602), a fingerprint recognition module, a card sensing module and a remote Bluetooth module. The outer wall of the rear box (102) is equipped with a button panel (1022), a fingerprint recognition head (1023) and a card swiping sensing part (1024).

9. A smart key box according to claim 8, characterized in that: The lower end of the rear box (102) is also equipped with a removable protective cover (1025), and the protective cover (1025) is provided with an indicator mark (10251). The rear box (102) is also equipped with a USB interface (1026). Opening the protective cover (1025) will expose the USB interface (1026) and the keyhole (531) of the mechanical lock cylinder (53).

10. A smart key box according to any one of claims 1-9, characterized in that: The upper end of the front box (101) is also connected to a detachable hook (9), and the front wall of the front box (101) is connected to a screw (1012) for installation and fixing.

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