Key box with key coded lock

Abstract

A key box of a key coded lock comprises a shell and a cover plate, a coded lock assembly is arranged in the cover plate, the cover plate is detachably installed at the position of an opening in the front end face of the shell, the cover plate is formed by assembling a panel and a base, a protrusion abutting against the inner wall of the opening of the shell is arranged at the lower end of the base, and the coded lock assembly comprises a coded key unit, a stop piece, a clear key and a spring bolt. The lock tongue is arranged on the front side of the base, the upper end of the lock tongue extends out of the cover plate and abuts against the inner wall of the opening of the shell to be locked, the other end of the lock tongue is fixed to the lock tongue, a button for driving the lock tongue to stretch out and draw back is installed on the cover plate, and an installation opening for installing the button is formed in the panel. When a password is input correctly, the button is pushed to move downwards, and the spring bolt is pulled to move downwards to be separated from the shell. The combination lock is simple and compact in structure and convenient to operate, the whole cover plate can be detached, so that the combination lock is convenient to assemble, and the combination lock is convenient to replace a password and carry out corresponding maintenance operation.

Description

Technical Field

[0001] This utility model belongs to the field of lock technology, and relates to a keypad combination lock, specifically a key box for a keypad combination lock. Background Technology

[0002] Keypad combination locks are widely used in the market due to their good security and convenient code changing capabilities, such as key boxes. A key box is a box specifically designed to store keys, typically used in property management, real estate agencies, or during renovations. It securely stores keys and access cards, and can be simply hung on the wall. However, currently available key boxes often have a front panel that is either integrally connected to the entire key box or hinged. This makes it difficult to disassemble the front panel, resulting in cumbersome code changing and hindering user maintenance.

[0003] An investigation revealed that Chinese patent CN202022274943.7, entitled "A Password Box with Button Assembly," includes: a shell, a button assembly mounted on the shell, the shell comprising an outer shell and an inner shell, the button assembly comprising a cover plate hinged to the shell, a fixing plate, several buttons, and a switch, a partition between the button assembly and the shell, each button consisting of a button body, a control component, and an adjustment component, the fixing plate comprising a first fixing plate, a second fixing plate, and a third fixing plate, each having holes corresponding to the number of buttons, the adjustment component being secured to the first fixing plate, the second and third fixing plates being placed on the adjustment component, the control component and the button body being mounted on the third fixing plate, and an adjustment groove at the bottom of the adjustment component, rotating the adjustment groove causing the control component and the adjustment component to rotate. This password box utilizes a foolproof design on the control component to change the password, allowing the password box to be opened by pressing the switch; however, its structure is complex and its cost is relatively high.

[0004] Furthermore, Chinese patent CN202221784617.3, entitled "A Key Box for Easy Assembly," includes a box body. A locking panel is installed in the center of the front of the box body, and a replaceable panel is located directly in front of the locking panel. The locking panel has integrally formed slots on both sides of its front, with locking strips engaging inside the slots. A sliding plate is located on the side of the locking strip away from the slot. The replaceable panel has an integrally cast groove inside, with a spring hooked onto one side of the groove. A fitting window is integrally cast at the bottom of the front of the replaceable panel, and a square groove is integrally cast at the top. While the front panel of this key box is easily detachable, its complex structure and high cost make it costly. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to provide a key box for a keypad combination lock that is simple and compact in structure and easy to assemble and disassemble, in view of the above-mentioned technical status.

[0006] The technical solution of this utility model is: a key box for a keypad combination lock, comprising a shell and a cover plate, wherein a combination lock assembly is provided inside the cover plate. The cover plate is detachably installed at the opening on the front face of the shell. The cover plate is assembled from a panel and a base. The lower end of the base has a protrusion that abuts against the inner wall of the opening in the shell. The combination lock assembly includes a keypad unit, a stop plate, a clear button, and a latch. The stop plate is positioned between the panel and the base and cooperates with the keypad unit. The latch is positioned on the front side of the base, with its upper end extending out of the cover plate and abutting against the inner wall of the opening in the shell for locking. The other end of the latch is fixed to the stop plate. A button for driving the latch to extend and retract is installed on the cover plate. An installation opening for the button is provided at the upper part of the panel. The button is installed at the installation opening with vertical movement limits. The inner end of the button is fixed to the stop plate. When the password is entered correctly, pushing the button downwards pulls the latch downwards, disengaging it from the shell, and the cover plate opens completely.

[0007] As an improvement, the password key unit includes a key and a key cap. The base has two rows of key slots on the left and right for the lower ends of the key to be inserted. Correspondingly, the panel has two rows of key holes on the left and right for the upper ends of the key to extend out. A first spring supports the key and the key cap, and a second spring supports the lower end of the key.

[0008] Furthermore, the button is divided into upper and lower parts, the lower part being a reduced diameter part that is inserted into the button slot of the base. The upper part of the button has two levels of grooves, the lower level groove being on the same plane as the stop piece. When no password is set, the lower level groove faces upward and the stop piece can move downward. When a password is set, the lower level groove faces downward and the stop piece cannot move.

[0009] Furthermore, the second spring is sleeved on the lower part of the button and supported between the inner wall of the button groove of the base and the stepped surface of the button. The bottom of the button is provided with a groove for rotating the button 180° to set a password. The bottom of the button is also provided with a three-dimensional arrow mark to distinguish whether a password has been set.

[0010] Furthermore, the button holes on the panel and the button slots on the base are arranged in five positions on each side. The stop plate is a rectangular piece with four cut-edge oval holes on each side. The upper end of the stop plate has a connecting piece that connects to the button. The connecting piece has a through hole and is fixed to the bottom of the button by screws.

[0011] Furthermore, the clear key is installed on the lower side of the cover plate, and the panel has an opening for the clear key to extend and move vertically.

[0012] Furthermore, the panel has connection holes at the four corners of its rear end face, and the base has corresponding countersunk holes. After the base and the panel are aligned, they are fixed together by screws. After the base and the panel are aligned, a notch is formed at the upper end for the lock tongue to extend.

[0013] Furthermore, the panel features three-dimensional letter markings for easy operation at the positions corresponding to the buttons and clear key.

[0014] Finally, the bottom of the housing is provided with several mounting holes for easy installation.

[0015] Compared with existing technologies, the advantages of this utility model are as follows: It eliminates the traditional hinge structure, allowing the cover plate to be easily removed entirely, saving materials and simplifying assembly, saving time and effort; it uses a combination key and button for opening, providing good anti-theft performance; and it includes a clear key for easier code changing. This utility model has a simple and compact structure, is easy to operate, and the detachable cover plate facilitates assembly, code changing, and maintenance of the combination lock. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model in the locked state;

[0017] Figure 2 for Figure 1 Top view;

[0018] Figure 3 for Figure 2 Sectional view along line AA;

[0019] Figure 4 This is a cross-sectional view of the unlocked state;

[0020] Figure 5 A schematic diagram of the stop plate in the unlocked state;

[0021] Figure 6 Schematic diagram of the stop plate;

[0022] Figure 7 This is an exploded view of the cover plate;

[0023] Figure 8 This is a schematic diagram of the bottom structure of the cover plate;

[0024] Figure 9 This is a schematic diagram of the button structure. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0026] like Figures 1-9As shown, a key box for a keypad combination lock includes a housing 1 and a cover 2. A combination lock assembly is housed within the cover 2. The cover 2 is detachably installed at the opening on the front face of the housing 1. The cover 2 is assembled from a panel 21 and a base 22. The lower end of the base 22 has a protrusion 222 that abuts against the inner wall of the opening in the housing 1. The combination lock assembly includes a keypad unit 4, a stop plate 7, a clear button 5, and a latch 6. The stop plate 7 is positioned between the panel 21 and the base 22 and engages with the keypad unit 4. The latch 6 is positioned... On the front side of the base 22, the upper end of the latch 6 extends out of the cover plate 2 and abuts against the inner wall of the opening of the housing 1 for locking. The other end of the latch 6 is fixed to the stop plate 7 by screws. A button 3 for driving the latch 6 to extend and retract is installed on the cover plate 2. An installation port for the button 3 is opened at the upper part of the panel 21. The button 3 is installed at the installation port with vertical limit movement. The inner end of the button 3 is fixed to the stop plate 7. When the password is entered correctly, the button 3 is pushed down to move the latch 6 down and disengage it from the housing 1, and the cover plate 2 is fully opened.

[0027] The specific structure is as follows: the password key unit 4 includes a key 41 and a key cap 42. The base 22 has two rows of key slots 221 for the lower ends of the key 41 to be inserted. Correspondingly, the panel 21 has two rows of key holes 211 for the upper ends of the key 41 to extend out. A first spring supports the key 41 and the key cap 42, and a second spring 40 supports the lower end of the key 41. The button 41 is divided into upper and lower parts. The lower part is a reduced diameter part 411, which is inserted into the button groove 221 of the base 22. The second spring 40 is sleeved on the lower reduced diameter part 411 of the button 41 and supported between the inner wall of the button groove 221 of the base 22 and the stepped surface of the button 41. The bottom of the button 41 is provided with a groove 414 for rotating the button 41 180° to set a password. The bottom of the button 41 is also provided with a three-dimensional arrow mark 415 to distinguish whether a password has been set. The upper part of the button 41 has two levels of grooves. The lower level groove 412 is on the same plane as the stop plate 7. When no password is set, the lower level groove 712 faces upward and the stop plate 7 can move downward. When a password is set, the lower level groove 412 faces downward and the stop plate 7 cannot move.

[0028] The keypad unit 4 consists of ten groups from 1 to 10. The keyholes 211 on the panel 21 and the key slots 221 on the base 22 are symmetrically arranged with five on each side. The stop plate 7 is a rectangular piece with four chamfered oval holes on each side (four on each side). A connecting piece for connecting to the button 3 protrudes from the upper end of the stop plate 7. The connecting piece has through holes 72 and is fixed to the bottom of the button 3 with screws. The clear button 5 is installed on the lower side of the cover plate 2. The panel 21 has an opening for the clear button 5 to extend and move vertically. The structure and working principle of the clear button 5 are similar to existing technologies and will not be described in detail here.

[0029] The rear end face of panel 21 has four connecting holes at its four corners, and the base 22 has corresponding countersunk holes. After the base 22 and panel 21 are mated, they are connected and fixed by screws. After the base 22 and panel 21 are mated, a notch is formed at the upper end for the latch 3 to extend. The panel 21 has three-dimensional letter markings for easy operation corresponding to the positions of button 3 and clear button 6. In addition, the bottom of the housing 1 has several mounting holes 11 for easy installation, and the housing 1 is mounted on the wall by screws.

[0030] When unlocking, enter the password. If the password is correct, press and hold button 3 and push it down. Button 3 will move the stop plate 7 and the bolt 3 downwards. The bolt 3 will disengage from the housing 1, and the cover plate 2 can be opened completely.

[0031] When a password needs to be set, flip the cover plate 2 over, exposing the bottom of button 41 in the button groove 411. Insert a flathead screwdriver into the flathead groove 414 and rotate it 180° clockwise. Figure 8 As shown, the arrow marking 415 points downwards, indicating that a password has been set.

[0032] In addition, since the password key unit 4 of this utility model is set to two levels, the key cap 42 is reset after the password is set, and the pressing force is the same as that of other internal settings, making the password difficult to crack and greatly increasing the anti-theft performance.

[0033] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A key box for a keypad combination lock, comprising a housing and a cover, wherein a combination lock assembly is disposed within the cover, characterized in that: The cover plate is detachably installed at the opening on the front face of the housing. The cover plate is assembled from a panel and a base. The lower end of the base has a protrusion that abuts against the inner wall of the opening of the housing. The combination lock assembly includes a combination key unit, a stop plate, a clear button, and a bolt. The stop plate is located between the panel and the base and cooperates with the combination key unit. The bolt is located on the front side of the base. The upper end of the bolt extends out of the cover plate and abuts against the inner wall of the opening of the housing for locking. The other end of the bolt is fixed to the stop plate. A button for driving the bolt to extend and retract is installed on the cover plate. The upper part of the panel has an installation port for installing the button. The button is installed at the installation port with vertical limit movement. The inner end of the button is fixed to the stop plate. When the password is entered correctly, the button is pushed down to move the bolt down and disengage it from the housing, and the cover plate is fully opened.

2. The key box for the keypad combination lock according to claim 1, characterized in that: The keypad unit includes a key and a keycap. The base has two rows of key slots on the left and right for the lower ends of the key to be inserted. Correspondingly, the panel has two rows of key holes on the left and right for the upper ends of the key to extend out. A first spring supports the key and the keycap, and a second spring supports the lower end of the key.

3. The key box for the keypad combination lock according to claim 2, characterized in that: The button is divided into two parts, the lower part being a reduced diameter part, which is inserted into the button slot of the base. The upper part of the button has two levels of grooves, the lower level groove and the stop piece are on the same plane. When no password is set, the lower level groove faces upward and the stop piece can move downward. When a password is set, the lower level groove faces downward and the stop piece cannot move.

4. The key box for the keypad combination lock according to claim 3, characterized in that: The second spring is sleeved on the lower part of the button and supported between the inner wall of the button groove of the base and the stepped surface of the button. The bottom of the button is provided with a groove for rotating the button 180° to set a password. The bottom of the button is also provided with a three-dimensional arrow mark to distinguish whether a password has been set.

5. The key box for the keypad combination lock according to claim 4, characterized in that: The button holes on the panel and the button slots on the base are arranged in five on each side. The stop plate is a rectangular piece with four chamfered oval holes on each side. The upper end of the stop plate has a connecting piece that connects to the button. The connecting piece has a through hole and is fixed to the bottom of the button by screws.

6. The key box for the keypad combination lock according to any one of claims 1 to 5, characterized in that: The clear key is installed on the underside of the cover plate, and the panel has an opening for the clear key to extend and move vertically.

7. The key box for the keypad combination lock according to any one of claims 1 to 5, characterized in that: The panel has connection holes at the four corners of its rear end face, and the base has corresponding countersunk holes. The base and panel are connected and fixed by screws after being aligned. After the base and panel are aligned, a notch is formed at the upper end for the lock tongue to extend.

8. The key box for the keypad combination lock according to any one of claims 1 to 5, characterized in that: The panel features three-dimensional letter markings for easy operation, corresponding to the positions of the buttons and the clear button.

9. The key box for a keypad combination lock according to any one of claims 1 to 5, characterized in that: The bottom of the housing is provided with several mounting holes for easy installation.

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