Lock box and unlocking driving structure thereof

Abstract

This invention discloses a lock box and its unlocking drive structure, which is simple in structure and highly reliable. The unlocking drive structure includes a box body, a cover, a bolt, and a combination lock assembly. The box body has a cavity. One end of the cover is rotatably connected to the cavity to allow the other end to open and close relative to the cavity. The bolt is elastically fitted to the side wall of the other end of the cavity. The combination lock assembly includes a fixed seat, a slider, and a bolt. The fixed seat is installed on the inner side of the other end of the cover, and the bolt locks when it abuts against the fixed seat. The slider is telescopically fitted to the side of the fixed seat and movably fitted with the bolt. The bolt is movably fitted to the fixed seat and has two positions that match the combination lock assembly's combination lock state: when the combination lock assembly is in the incorrect combination state, the bolt is in the first position and has no relative interaction with the slider, and the bolt locks the fixed seat; when the combination lock assembly is in the correct combination state, the bolt is in the second position and acts magnetically on the slider to make it slide. When the slider slides, it pushes the bolt to disengage from the fixed seat.

Description

Technical Field

[0001] This invention belongs to the field of lock technology, and specifically refers to a lock box and its unlocking drive structure. Background Technology

[0002] A lockbox is a container with a lock for securely storing items. They mainly fall into two categories: one is a fixed lockbox, installed on a doorknob or wall, often used to store spare keys for convenient self-check-in at guesthouses, property viewings by agents, or temporary authorization for others to enter. It is typically opened with a mechanical combination or electronic keypad. The other type is a portable lockbox, small in size and water-resistant, often secured to objects like beach chairs or exercise benches with steel cables. It's used to securely store personal items such as phones and wallets at the beach, camping, or gym, or to store passports and cash while traveling, adding an extra layer of theft protection to backpacks.

[0003] However, most existing lock boxes rely on complex, purely mechanical transmission structures for their latch drive mechanisms, such as gear and rack mechanisms, multi-link assemblies, or cam and spring systems. These structures generally suffer from the following significant drawbacks: Firstly, achieving stable extension and retraction of the latch requires the integration of numerous precision components, leading to cumbersome assembly processes, high production costs, and extremely stringent requirements for component machining accuracy and tolerances. Secondly, with increased usage, wear, increased clearances, and even jamming or disengagement faults inevitably occur between the numerous transmission components, severely reducing the overall unlocking reliability and service life of the lock box.

[0004] Therefore, there is an urgent need for a new lock box solution that can simplify the drive structure, reduce moving parts, and improve unlocking stability. Summary of the Invention

[0005] The main objective of this invention is to provide a lock box and its unlocking drive structure, which uses magnetic force to drive the lock tongue to move, thus solving the problems of complex lock tongue drive structures, numerous parts, easy wear, and low reliability in the prior art.

[0006] To achieve the above objectives, one solution of the present invention is: A lock box unlocking drive structure includes a box body, a cover, a latch, and a combination lock assembly. The box body has a cavity. One end of the cover is rotatably connected to the cavity to allow the other end to open and close relative to the cavity. The latch is elastically engaged with the side wall at the other end of the cavity. The combination lock assembly includes a fixed base, a slider, and a bolt. The fixed base is mounted on the inner side of the other end of the cover, and the latch engages with the fixed base to lock. The slider is telescopically engaged with the side of the fixed base and movably engages with the latch. The bolt movably engages with the fixed base and has two positions matching the combination lock assembly's combination lock state: when the combination lock assembly is in an incorrect combination state, the bolt is in a first position and has no relative interaction with the slider, and the latch locks the fixed base; when the combination lock assembly is in a correct combination state, the bolt is in a second position and acts magnetically on the slider to make it slide, and the slider's sliding motion pushes the latch to disengage from the fixed base.

[0007] A first magnet is installed on the side of the bolt near the slider, and a second magnet is embedded in the slider. When the bolt is in the second position, the first magnet and the second magnet are positioned opposite each other with the same magnetic poles facing each other, thereby generating a repulsive magnetic force that drives the slider to push out toward the latch.

[0008] In a preferred embodiment, the slider has a stepped surface on the side facing the bolt for limiting the bolt; the bottom of the cavity has a protruding post that movably passes through the fixed seat, and the top of the protruding post has a guide slope that abuts against the slider; when the cover is pressed down, the protruding post pushes the slider to slide to release the limiting effect on the bolt; the bottom of the cavity also has an auxiliary elastic element that acts on the bolt.

[0009] The password assembly employs a digit wheel lock mechanism, further comprising a lock shaft, several sets of bushings and digit wheels, and a reset member; the lock shaft is rotatably fitted within the fixed base and can move axially relative to the fixed base; the bushings are sleeved on the lock shaft; the digit wheels are movably sleeved on the circumferential surface of the bushings; the reset member is used to drive the bolt to switch from the first position to the second position; the bolt is provided with a through hole for the digit wheels to move through, and a boss is provided on its surface; the circumferential surface of the bushing is provided with a clearance groove for the boss to move into place; when the password assembly is in an incorrect password state, the clearance groove and the boss are misaligned, and the bushing pushes the bolt to the first position; when the password assembly is in a correct password state, the clearance groove and the boss are opposite each other, and the bolt switches to the second position under the action of the reset member.

[0010] In a preferred embodiment, the fixed base further includes a reset component, and the reset component has a positioning spring arm that abuts against a positioning groove on the circumferential surface of the digit wheel. The movable end of the positioning spring arm abuts against the lower surface of the bolt, and the movable end has a positioning protrusion that is movably embedded in the positioning groove. The bolt has a third position where it does not contact the bushing. When the bolt is in the third position, it presses down on the movable end of the positioning spring arm and disengages the positioning protrusion from the positioning groove. The system also includes a reset button and a reset spring. The zeroing button is slidably fitted within the fixed base and abuts against the bolt. The zeroing elastic element is disposed between the fixed base and the zeroing button and always acts on the zeroing button to push the zeroing button to push the bolt to the third position. The zeroing button has a pressing shaft that extends out of the fixed base. When the cover is in the closed state, the pressing shaft abuts against the bottom of the cavity, forcing the zeroing button to retract into the fixed base and compressing the zeroing elastic element. At this time, the bolt retracts from the third position.

[0011] In a preferred embodiment, the password assembly further includes a retainer, a code-changing button, and a code-changing elastic element. The retainer is mounted on the fixed base and can move axially along the fixed base to drive the bushing to move relative to the digit wheel. The code-changing button slides on the fixed base and abuts against the retainer to drive the retainer to move axially. The code-changing elastic element drives the retainer to reset. The fixed base has a code-changing step on the groove of the reset button. When the reset button slides to be opposite the code-changing step, it can rotate and engage with the code-changing step to keep the bolt in the first position.

[0012] In a preferred embodiment, the locating component is provided with a zeroing spring arm corresponding to the number of the digit wheels; a cam is fixedly provided on the side of each digit wheel, and the circumferential surface of the cam is composed of a convex surface and a flat surface; the zeroing spring arm abuts against the circumferential surface of the cam with its own elastic force, and drives the digit wheel to rotate when the zeroing spring arm abuts against the convex surface, until the digit wheel stops rotating when the zeroing spring arm abuts against the flat surface.

[0013] In a preferred embodiment, the bushing is provided with a spline, and the character wheel is provided with a spline groove for the spline to be embedded in; when the spline is embedded in the spline groove, the two rotate synchronously; when the bushing is pushed by the retainer to disengage the spline from the spline groove, the character wheel can rotate independently.

[0014] One end of the cavity is provided with an opening elastic element, which acts on the cover to provide an elastic force that drives the cover to flip outward; the other end of the cavity is provided with a locking elastic element in the side wall, which drives the latch to extend out of the side wall of the cavity in the normal state; the fixed seat is provided with a locking plane, which abuts against the locking plane when the latch extends out of the side wall of the cavity under the action of the locking elastic element.

[0015] In a preferred embodiment, a hook groove is provided on the locking plane, and a barb with a movable hook is provided at the front end of the locking tongue and fastened in the hook groove.

[0016] In a preferred embodiment, the housing has an installation groove corresponding to the mating position of the latch, and a mounting base is fixed in a detachable manner; the mounting base and the housing together enclose an active space for the latch to slide and engage, and the locking elastic element is disposed between the latch and the side wall of the active space.

[0017] The second solution of the present invention is: A lock box, including an unlocking drive structure for the lock box.

[0018] After adopting the above technical solution, the present invention has the following technical effects: The design of this invention controls the relative position of the bolt within the fixed base by controlling the password state of the password component, and uses magnetic force to drive the slider non-contactly to push the bolt, thereby changing the state of the bolt and realizing the opening and closing of the lock. This invention greatly simplifies the internal structure of the lock box, reduces the application of easily worn transmission components such as gears and connecting rods, reduces the assembly difficulty and manufacturing cost of parts, and avoids mechanical jamming and friction noise, making the unlocking action smooth, easy and quiet. Attached Figure Description

[0019] Figure 1 This is a three-dimensional view of a closed state according to a specific embodiment of the present invention.

[0020] Figure 2 This is a perspective view of the open state of a specific embodiment of the present invention.

[0021] Figure 3 This is an exploded view of a specific embodiment of the present invention.

[0022] Figure 4 The three-dimensional type wheel is a specific embodiment of the present invention. Figure 1 .

[0023] Figure 5 The three-dimensional type wheel is a specific embodiment of the present invention. Figure 2 .

[0024] Figure 6Bushing 3D according to a specific embodiment of the present invention Figure 1 .

[0025] Figure 7 Bushing 3D according to a specific embodiment of the present invention Figure 2 .

[0026] Figure 8 This is a perspective view of the reset component according to a specific embodiment of the present invention.

[0027] Figure 9 This is a perspective view of the component according to a specific embodiment of the present invention.

[0028] Figure 10 This is a perspective view of the operating component according to a specific embodiment of the present invention.

[0029] Figure 11 This is a cross-sectional view and a schematic diagram of the locking principle of a specific embodiment of the present invention.

[0030] Figure 12 This is a cross-sectional view and a schematic diagram of the unlocking principle of a specific embodiment of the present invention.

[0031] Figure 13 This is a schematic diagram of the bolt angle under the incorrect password state in a specific embodiment of the present invention.

[0032] Figure 14 This is a schematic diagram of the bolt angle under the correct password state according to a specific embodiment of the present invention.

[0033] Figure 15 This is a schematic diagram illustrating the automatic zeroing principle of a specific embodiment of the present invention.

[0034] Figure 16 This is a schematic diagram illustrating the password replacement principle in a specific embodiment of the present invention.

[0035] Explanation of icon numbers: 100 - Box body; 101 - Cavity; 102 - Protruding pillar; 103 - Guide slope; 200 - Cover; 201 - Window; 202 - Sliding cover; 300 - Locking tongue; 301 - Barbed hook; 400 - Password assembly; 401 - Mounting base; 4011 - Locking surface; 4012 - Code changing step; 4013 - Hook groove; 402 - Slider; 4021 - Step surface; 403 - Bolt; 4031 - Shaft; 4032 - Through hole; 4033 - Boss; 404 - Lock shaft; 405 - Bushing; 4051 - Clearance groove; 4052 - Spline; 406 - Number wheel; 4061 - Positioning 4062 - Cam; 4063 - Spline groove; 407 - Reset component; 4071 - Reset spring arm; 4072 - Positioning spring arm; 4073 - Positioning protrusion; 408 - Return component; 4081 - Zeroing spring arm; 409 - Zeroing button; 4091 - Pressing shaft; 410 - Zeroing elastic component; 411 - Cage; 412 - Panel; 413 - Code change button; 414 - Code change elastic component; 500 - Lid opening elastic element; 600 - Locking elastic element; 700 - Mounting base; 800 - First magnet; 900 - Second magnet. Detailed Implementation

[0036] To further explain the technical solution of the present invention, the present invention will be described in detail below through specific embodiments.

[0037] refer to Figures 1 to 16 As shown, the present invention discloses an unlocking drive structure for a lock box, including a box body 100, a cover body 200, a lock tongue 300 and a password component 400; The box body 100 is provided with a cavity 101 for storing items; One end of the cover 200 is rotatably connected to the cavity 101 to enable the other end to open and close relative to the cavity 101. The locking tongue 300 is elastically fitted to the side wall at the other end of the cavity 101; The combination lock component 400 is installed on the inner side of the other end of the cover 200. It includes a fixing seat 401, a slider 402, and a bolt 403. The fixing seat 401 is installed on the inner side of the other end of the cover 200. When the bolt 300 abuts against the fixing seat 401, it locks the cover. The slider 402 is telescopically fitted to the side of the fixing seat 401 and is movably fitted with the bolt 300. The bolt 403 is movably fitted to the fixing seat 401 and has two positions that match the combination lock state of the combination lock component 400: when the combination lock component 400 is in the incorrect combination state, the bolt 403 is in the first position and has no relative interaction with the slider 402, and the bolt 300 locks the fixing seat 401; when the combination lock component 400 is in the correct combination state, the bolt 403 is in the second position and acts magnetically on the slider 402 to make it slide. When the slider 402 slides, it pushes the bolt 300 to make the bolt 300 disengage from the fixing seat 401. At this time, the lock box can be opened (the cover 200 can be flipped outward).

[0038] Through the above scheme, the design of this invention controls the relative position of the bolt 403 within the fixed base 401 by controlling the password state of the password component 400, and uses magnetic force to drive the slider 402 non-contactly to push the bolt 300, thereby changing the state of the bolt 300 and realizing the opening and closing of the lock. This invention significantly simplifies the internal structure of the lock box, reduces the application of easily worn transmission components such as gears and connecting rods, reduces the assembly difficulty and manufacturing cost of parts, and avoids mechanical jamming and friction noise, making the unlocking action smooth, easy and quiet. Specifically, the magnetic drive method has a rapid response and does not require intermediate transmission conversion links. The unlocking command can be transmitted to the bolt 300 through the slider 402 instantly when the bolt 403 switches from the first position to the second position, making the action more direct and efficient. Since there is no physical contact between the bolt 403 and the slider 402, long-term use will not cause wear-induced increased clearance or failure of action, significantly improving the durability and reliability of the lock box. In addition, the reduced number of parts also facilitates modular assembly and later maintenance, further reducing the overall cost of the product.

[0039] The following shows the structural details of the above-mentioned unlocking drive structure: One end of the cavity 101 is provided with an opening elastic element 500, which acts on the cover 200 to provide a spring force that drives the cover 200 to flip outward, so that the cover 200 can automatically open when the fixing seat 401 releases the locking tongue 300. The other end of the cavity 101 is provided with a locking elastic element 600, which is used to drive the locking tongue 300 to extend out of the side wall of the cavity 101 in the normal state. The fixing seat 401 is provided with a locking plane 4011, which is movably engaged with the locking tongue 300. When the locking tongue 300 extends out of the side wall of the cavity 101 under the action of the locking elastic element 600, the locking tongue 300 abuts against the locking plane 4011, thereby locking the cover 200. Therefore, when the bolt 403 is in the first position (incorrect password state), the latch 300 remains against the locking plane 4011, and the cover 200 cannot be opened; when the bolt 403 is in the second position (correct password state), the slider 402 is driven by magnetic force to slide, pushing the latch 300 away from the locking plane 4011, and the cover 200 is no longer restricted by the latch 300, and can be automatically opened by the cover-opening elastic element 500. The cover-opening elastic element 500 is preferably a torsion spring, and the locking elastic element 600 is preferably a compression spring.

[0040] Furthermore, the aforementioned locking plane 4011 is provided with a hook groove 4013, and the front end of the latch 300 is provided with a barb 301 that is movable and hooked into the hook groove 4013. When the lock box is closed, forcefully striking the lock box may cause the latch 300 to retract and open the cover. The cooperation between the barb 301 and the hook groove 4013 can prevent forced unlocking. After entering the correct password, the user can gently press the cover 200 to move the cover 200 and the password component 400 downwards, thereby causing the barb 301 to disengage from the hook groove 4013. At this time, the latch 300 can be pushed back by the action of the slider 402.

[0041] Furthermore, the aforementioned housing 100 has a mounting groove corresponding to the mating position of the latch 300, and a mounting base 700 is fixed in place by a detachable method such as screws. The mounting base 700 and the housing 100 together enclose an active space for the latch 300 to slide and engage. The locking elastic element 600 is disposed between the latch 300 and the side wall of this active space. Thus, the latch 300 and the locking elastic element 600 are integrated into an independent and detachable assembly unit, which not only facilitates the modular installation and replacement of parts, reducing the difficulty of production assembly and subsequent maintenance costs, but also allows the active space formed by the mounting base 700 and the housing 100 to precisely limit the sliding stroke of the latch 300, preventing the elastic element 600 from skewing or dislodging, ensuring the smooth extension and repositioning of the latch 300 during long-term reciprocating motion, and further improving the stability and durability of the overall lock box structure.

[0042] The aforementioned bolt 403 is rotatably fitted into the fixed base 401 via the pivots 4031 at both ends. A first magnet 800 is installed on the side of the bolt 403 near the slider 402, and a second magnet 900 is embedded in the slider 402. When the bolt 403 is in the first position (see...), Figure 11 The first magnet 800 and the second magnet 900 are arranged in a staggered manner, and their magnetic forces do not interact; when the bolt 403 is in the second position (see...), Figure 12 The first magnet 800 and the second magnet 900 are positioned opposite each other with their same magnetic poles facing each other (e.g., N poles facing N poles, or S poles facing S poles), thereby generating a repulsive magnetic force that drives the slider 402 to push towards the latch 300. Thus, by arranging the first magnet 800 and the second magnet 900 with their same magnetic poles facing each other, a non-contact drive is achieved using the principle of like poles repulsion. The bolt 403 and the slider 402 do not require any mechanical contact to transmit the unlocking power, completely eliminating the friction, wear, and clearance problems of traditional transmission structures. Even after long-term use, it maintains a sensitive and accurate unlocking response. Furthermore, this magnetic drive method only requires the bolt 403 to rotate to the second position to instantly generate a repulsive force to push the slider 402. The action is direct and rapid, requiring no complex energy conversion or intermediate transmission links, further simplifying the internal structure of the lock box, reducing assembly precision requirements and manufacturing costs, and providing a quieter and smoother user experience without collision noise during the unlocking process. In actual unlocking operations, because the latch 300 is tightly pressed against the locking plane 4011 by the locking elastic element 600 when locked, there is a large static friction between them. At this time, the repulsive force between the first magnet 800 and the second magnet 900 is not enough to directly push the slider 402 to push the latch 300 away from the locking plane 4011. Therefore, the user can first press the cover 200 slightly to make a small vertical relative displacement between the latch 300 and the locking plane 4011, thereby significantly reducing the contact pressure and friction between them. In this state, the repulsive force generated by the bolt 403 switching to the second position can effectively push the slider 402 to push the latch 300 away from the locking plane 4011. Then, the cover 200 automatically pops open under the action of the opening elastic element 500, completing the unlocking. This design takes into account both the stability of the locked state and the ease of unlocking operation.

[0043] Furthermore, the side of the aforementioned bolt 403 is detachably provided with a block-shaped component for embedding the first magnet 800. The first magnet 800 can be pre-embedded and fixed on the block-shaped component, and then the block-shaped component can be assembled to the corresponding position of the bolt 403, which facilitates the rapid assembly and subsequent replacement of the magnet and reduces the difficulty of production and processing.

[0044] Meanwhile, the slider 402 facing the bolt 403 has a stepped surface 4021 for limiting the bolt 403. This stepped surface 4021 can act directly on the bolt 403, or on the first magnet 800 or the aforementioned block, thus limiting the bolt 403 from switching to the second position. This eliminates the "click" noise caused by the bolt 403 resetting when the last digit of the password is entered and in place. At this time, even if the correct password is entered completely, the bolt 403 will not move. Therefore, some design is needed to slightly move the slider 402 before opening the cover to release the bolt. To address the limitation of 403, the present invention provides a protruding post 102 that movably passes through the fixed base 401 at the bottom of the cavity 101. The top of the protruding post 102 is provided with a guide slope 103 that abuts against the slider 402. By lightly pressing the cover 200, the user can cause the protruding post 102 to push the slider 402 to slide slightly, thereby releasing the restriction on the bolt 403 (without pushing the latch 300 to fully retract to avoid opening the cover). Furthermore, the bottom of the cavity 101 is also provided with an auxiliary elastic element (such as the spring shown in the figure) that acts on the bolt 403, increasing the elastic force that causes the bolt 403 to move in the unlocking direction. At this time, the magnetic force can be increased accordingly.

[0045] The aforementioned password component 400 employs a digit lock mechanism, and further includes a lock shaft 404, several sets of bushings 405 and digit wheels 406, and a reset member 407; the lock shaft 404 is rotatably fitted within the fixed base 401 and can move axially relative to the fixed base 401; the bushings 405 are sleeved on the lock shaft 404 and can remain stationary or rotate relative to the lock shaft 404 as the lock shaft 404 moves axially; the digit wheels 406 are movably sleeved on the circumferential surface of the bushings 405 (the bushings 405 are embedded within the digit wheels 406), and can rotate together with the bushings 405 or rotate relative to them; the reset member 407 is disposed within the fixed base 401 and located on the side of the bolt 403 facing away from the bushings 405. Figures 13 to 15The diagram shows a pin located below the bolt 403, used to drive the bolt 403 from a first position to a second position. The bolt 403 has a through hole 4032 through which the number wheel 406 moves, and a boss 4033 is provided on its surface. The bushing 405 has a clearance groove 4051 on its circumferential surface for the boss 4033 to be movably fitted. When the password assembly 400 is in the incorrect password state, the clearance groove 4051 and the boss 4033 are misaligned, and the bushing 405 pushes the bolt 403 to the first position. When the password assembly 400 is in the correct password state, the clearance groove 4051 and the boss 4033 are opposite to each other, and the bolt 403 is switched to the second position under the action of the reset member 407. By using the misalignment or alignment of the boss 4033 of the bolt 403 and the clearance groove 4051 of the bushing 405, the mechanical identification of the password status and the linkage control of the bolt position are realized. Password verification can be completed without any electronic components. The structure is reliable and has strong anti-interference ability. At the same time, the reset component 407 can automatically drive the bolt 403 to switch positions when the password is correct. The operation is smooth and avoids the inconvenience of manual reset.

[0046] In some embodiments of the aforementioned password component 400, the reset member 407 is provided with at least one reset spring arm 4071 abutting against the side of the bolt 403 facing away from the bushing 405, for providing spring force to drive the bolt 403 to switch from the first position to the second position. The reset member 407 has reset spring arms 4071 at both ends, making the force on the bolt 403 more stable.

[0047] In some embodiments of the aforementioned password component 400, the fixing base 401 is further provided with a resetting component 408, which is used to drive the digit wheel 406 to reset to its initial state, for example, so that all the digits displayed by the digit wheels are "0", that is, to present the initial password "0000" to the user; at the same time, the resetting component 407 is provided with a positioning spring arm 4072, which abuts against the positioning groove 4061 opened on the circumference of the digit wheel 406, and is used to lock the digit wheel 406 to prevent it from rotating freely, thereby "fixing" the currently displayed password. Thus, as Figure 15 As shown, the password component 400 can achieve the following functions: when the positioning spring arm 4072 of the reset component 407 disengages from the circumference of the character wheel 406, the character wheel 406 can automatically return to zero under the action of the return component 408, especially after unlocking, to prevent password leakage; while in the locked state, the positioning spring arm 4072 of the reset component 407 keeps the character wheel 406 locked, and the user can normally move the character wheel to input the password. The return component 408 can be stacked with the reset component 407, and both are made of elastic and stable materials, such as metal sheets processed as needed to create the corresponding structure. This results in high structural strength and stable elastic performance, eliminating the need for additional elastic components and further simplifying the assembly process; moreover, the separate design of the two components avoids mutual interference between functions.

[0048] Furthermore, the movable end of the aforementioned positioning spring arm 4072 abuts against the lower surface of the bolt 403, and the movable end is provided with a positioning protrusion 4073 that is movably embedded in the positioning groove 4061; the bolt 403 is provided with a third position that does not contact the bushing 405. When the bolt 403 is in the third position, the bolt 403 presses down on the movable end of the positioning spring arm 4072 and causes the positioning protrusion 4073 to disengage from the positioning groove 4061, thereby realizing the automatic zeroing function.

[0049] Secondly, the aforementioned password component 400 also includes a reset button 409 and a reset elastic element 410. The reset button 409 is slidably fitted within the fixed base 401 and abuts against the bolt 403. The reset elastic element 410 is disposed between the fixed base 401 and the reset button 409 and always acts on the reset button 409, thereby pushing the reset button 409 to push the bolt 403 to the third position. At the same time, the reset button 409 has a pressing shaft 4091 extending out of the fixed base 401. When the cover 200 is in the closed state (i.e., the locked state), the pressing shaft 4091 abuts against the bottom of the cavity 101, forcing the reset button 409 to retract into the fixed base 401 and compress the reset elastic element 410. At this time, the bolt 403 exits the third position, and the reset function is disabled. Therefore, the lock box can automatically trigger a zeroing function after the cover is opened (when the pressing shaft 4091 is not pressed), preventing the password from being leaked; and after the cover is closed, the zeroing function is automatically disabled to avoid interfering with the user's normal password input.

[0050] Furthermore, the aforementioned password assembly 400 also includes a retainer 411, a panel 412, a code-changing button 413, and a code-changing elastic element 414. The retainer 411 is mounted on the fixed base 401 and is restricted by the panel 412 to prevent it from detaching from the fixed base 401. The retainer 411 can move axially along the fixed base 401 to drive the bushing 405 to move relative to the character wheel 406, thereby changing the engagement mode (engagement or disengagement) between the bushing 405 and the character wheel 406. The code-changing button 413 is slidably engaged on the fixed base 401 and abuts against the retainer. The retainer 411 is used to drive the retainer 411 to move axially; the code-changing elastic element 414 is used to drive the retainer 411 to reset; the fixed base 401 has a code-changing step 4012 on the slide groove of the zeroing button 409. When the zeroing button 409 slides to be opposite the code-changing step 4012, it can rotate and lock into the code-changing step 4012 to keep the locking bolt 403 in the first position, so that it will not switch to the third position under the action of the zeroing elastic element 410, thereby keeping the digit wheel 406 in a state that can be moved and positioned by the user. Based on the above structure, see Figure 16 The working principle of the password component 400 to change the password is as follows: (1) When the lock box is in the open state (i.e., the pressing shaft 4091 of the zero button 409 is not pressed), the user first enters the original correct password, so that the bolt 403 is in the second position (at this time, the positioning groove 4061 of the number wheel 406 is disengaged from the positioning protrusion 4073, but the zero button 409 has not yet been engaged in the code changing step 4012). (2) Subsequently, the user pushes the zero button 409 and rotates it slightly, which is then inserted into the code-changing step 4012. At this time, the bolt 403 is held in the first position, the positioning protrusion 4073 of the positioning spring arm 4072 remains embedded in the positioning groove 4061, and the character wheel 406 cannot rotate freely. (3) Next, the user presses and holds the code change button 413. The code change button 413 pushes the retainer 411 to move axially, so that the bushing 405 disengages from the character wheel 406. At this time, the character wheel 406 can rotate relative to the bushing 405, while the bushing 405 and the locking shaft 404 remain stationary. The user can then turn the character wheel 406 to set a new password. (4) After the setting is completed, the user releases the code change button 413, the code change elastic element 414 drives the retainer 411 to reset, and drives the bushing 405 to re-engage with the character wheel 406; (5) Finally, the user presses the zeroing button 409 again to exit the code-changing step 4012. The zeroing button 409 is reset under the action of the zeroing elastic element 410, and the bolt 403 regains the ability to switch to the third position. At the same time, the zeroing element 408 drives the character wheel 406 to automatically return to zero. At this point, the password change is complete, and all character wheels 406 are displayed in the initial zeroing state.

[0051] Furthermore, the aforementioned zeroing component 408 is equipped with zeroing spring arms 4081 corresponding to the number of digit wheels 406; each digit wheel 406 has a cam 4062 fixedly mounted on its side, the circumferential surface of which is composed of a convex surface and a flat surface; the zeroing spring arms 4081 abut against the circumferential surface of the cam 4062 with their own elastic force: when the zeroing spring arms 4081 abut against the convex surface, the elastic potential energy of the zeroing spring arms 4081 is converted into torque, driving the digit wheels 406 to rotate; as the digit wheels 406 rotate, the zeroing spring arms 4081 gradually slide towards the flat surface until they completely abut against the flat surface, at which point the digit wheels 406 stop rotating. At this time, the digit wheels 406 display the preset zeroing number (such as "0"), thereby achieving automatic zeroing and reset.

[0052] In some embodiments of the above-mentioned password component 400, the bushing 405 is provided with a spline 4052, and the character wheel 406 is provided with a spline groove 4063 for the spline 4052 to be embedded in; when the spline 4052 is embedded in the spline groove 4063, the two can rotate synchronously; when the bushing 405 is pushed by the retainer 411 to disengage the spline 4052 from the spline groove 4063, the character wheel 406 can rotate independently.

[0053] The cover 200 is provided with a window 201 opposite to the password component 400. A sliding cover 202 is slidably fitted inside the window 201 to cover the password component 400 and achieve functions such as dust prevention.

[0054] refer to Figures 1 to 16 As shown, the present invention also discloses a lock box having the above-mentioned unlocking drive structure, which obviously also has all the beneficial effects brought by the unlocking drive structure, and will not be repeated here.

[0055] The above embodiments and figures are not intended to limit the product form and style of the present invention. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of the present invention.

Claims

1. A lock box unlocking drive structure, characterized in that: Includes the box body, lid, latch, and combination lock components; The box body is provided with a cavity; One end of the cover is rotatably connected inside the cavity to allow the other end to open and close relative to the cavity. The locking tongue is elastically fitted to the side wall at the other end of the cavity; The combination lock component includes a fixed base, a slider, and a bolt. The fixed base is installed on the inner side of the other end of the cover, and the bolt engages with the fixed base to lock. The slider extends and retracts to the side of the fixed base and engages with the bolt. The bolt engages with the fixed base and has two positions that correspond to the combination lock state: when the combination lock is in the incorrect combination state, the bolt is in the first position and has no interaction with the slider, and the bolt locks the fixed base; when the combination lock is in the correct combination state, the bolt is in the second position and acts magnetically on the slider to make it slide. When the slider slides, it pushes the bolt to disengage from the fixed base.

2. The unlocking drive structure of the lock box according to claim 1, characterized in that: A first magnet is installed on the side of the bolt near the slider, and a second magnet is embedded in the slider. When the bolt is in the second position, the first magnet and the second magnet are positioned opposite each other with the same magnetic poles facing each other, thereby generating a repulsive magnetic force that drives the slider to push out toward the latch.

3. The unlocking drive structure of the lock box according to claim 2, characterized in that: The slider has a stepped surface on the side facing the bolt to limit the bolt; the bottom of the cavity has a protruding post that moves through the fixed seat, and the top of the protruding post has a guide slope that abuts against the slider; when the cover is pressed down, the protruding post pushes the slider to slide and release the bolt from the limiting position; the bottom of the cavity also has an auxiliary elastic element that acts on the bolt.

4. The unlocking drive structure of the lock box according to claim 1, characterized in that: The password assembly employs a digit wheel lock mechanism, further comprising a lock shaft, several sets of bushings and digit wheels, and a reset member; the lock shaft is rotatably fitted within the fixed base and can move axially relative to the fixed base; the bushings are sleeved on the lock shaft; the digit wheels are movably sleeved on the circumferential surface of the bushings; the reset member is used to drive the bolt to switch from the first position to the second position; the bolt is provided with a through hole for the digit wheels to move through, and a boss is provided on its surface; the circumferential surface of the bushing is provided with a clearance groove for the boss to move into place; when the password assembly is in an incorrect password state, the clearance groove and the boss are misaligned, and the bushing pushes the bolt to the first position; when the password assembly is in a correct password state, the clearance groove and the boss are opposite each other, and the bolt switches to the second position under the action of the reset member.

5. The unlocking drive structure for the lock box according to claim 4, characterized in that: The fixed base also includes a reset component, and the reset component has a positioning spring arm that abuts against a positioning groove on the circumferential surface of the character wheel. The movable end of the positioning spring arm abuts against the lower surface of the bolt, and the movable end has a positioning protrusion that is movably embedded in the positioning groove. The bolt has a third position where it does not contact the bushing. When the bolt is in the third position, it presses down on the movable end of the positioning spring arm and causes the positioning protrusion to disengage from the positioning groove. It also includes a reset button and a reset elastic element. The reset button slides within the fixed base and abuts against the bolt. The reset elastic element is disposed between the fixed base and the reset button and always acts on the reset button to push the reset button to push the bolt to the third position. The reset button has a pressing shaft that extends out of the fixed base. When the cover is in the closed state, the pressing shaft abuts against the bottom of the cavity, forcing the reset button to retract into the fixed base and compressing the reset elastic element. At this time, the bolt retracts from the third position.

6. The unlocking drive structure for the lock box according to claim 5, characterized in that: The password assembly further includes a retainer, a code-changing button, and a code-changing elastic element; the retainer is mounted on the fixed base and can move axially along the fixed base to drive the bushing to move relative to the digit wheel; the code-changing button is slidably engaged on the fixed base and abuts against the retainer to drive the retainer to move axially; the code-changing elastic element is used to drive the retainer to reset; the fixed base is provided with a code-changing step on the slide groove of the reset button, and when the reset button slides to be opposite the code-changing step, it can rotate and engage in the code-changing step to keep the bolt in the first position.

7. The unlocking drive structure for the lock box according to claim 5, characterized in that: The reset component is equipped with a reset spring arm corresponding to the number of the digit wheels; each digit wheel is fixedly provided with a cam on its side, and the circumferential surface of the cam is composed of a convex surface and a flat surface; the reset spring arm abuts against the circumferential surface of the cam with its own elastic force, and drives the digit wheel to rotate when the reset spring arm abuts against the convex surface, until the digit wheel stops rotating when the reset spring arm abuts against the flat surface.

8. The unlocking drive structure for the lock box according to claim 6, characterized in that: The bushing is provided with a spline, and the character wheel is provided with a spline groove for the spline to be embedded in; when the spline is embedded in the spline groove, the two rotate synchronously; when the bushing is pushed by the retainer to disengage the spline from the spline groove, the character wheel can rotate independently.

9. The unlocking drive structure for the lock box according to claim 1, characterized in that: One end of the cavity is provided with an opening elastic element, which acts on the cover to provide a spring force that drives the cover to flip outward; the other end of the cavity has a locking elastic element in the side wall, which drives the latch to extend out of the side wall of the cavity in its normal state; the fixed seat has a locking plane, which abuts against the locking plane when the latch extends out of the side wall of the cavity under the action of the locking elastic element; the locking plane has a hook groove, and the front end of the latch has a barb that hooks into the hook groove; the box body has a mounting groove corresponding to the mating position of the latch, and a mounting seat is fixed in a detachable manner; the mounting seat and the box body together form an active space for the latch to slide and engage, and the locking elastic element is disposed between the latch and the side wall of the active space.

10. A lock box, characterized in that, The lock box includes an unlocking drive structure according to any one of claims 1 to 9.

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