A new cabinet door lock

Abstract

The utility model relates to a novel cabinet door lock, including lock sleeve, lock core, lock tongue and fixed screw, the lock sleeve middle part is forward and backward and is provided with lock core installation mouth, the lock core rotation is installed in lock core installation mouth, the rear end of lock core passes out lock sleeve and is connected with lock tongue through fixed screw, the lock sleeve is in the middle part of lock core installation mouth inboard annular and is provided with the locating step, at least two locating sockets are set up on the locating step, the outside wall of lock core is integrative and is provided with the locating block, the locating socket is located on the rotating track of the locating block with the rotation of lock core, be equipped with elastic piece between lock tongue and lock sleeve, the utility model is when the lock core rotates, the locating block enters or separates from the locating socket along the rotating track, is pressed in the locating socket under the action of the wave spring, thereby realizes reliable spacing of lock core under the locking and unlocking state, and its simple structure, positioning is reliable, operation is smooth, convenient to install, and strong durability.

Description

Technical Field

[0001] This utility model relates to the field of lock technology, and in particular to a novel cabinet door lock. Background Technology

[0002] With the continuous improvement of people's living standards, various types of cabinets, such as storage cabinets, filing cabinets, and electrical distribution cabinets, are widely used in homes, offices, and public facilities. Cabinet door locks are an important component of cabinet protection.

[0003] Most existing cabinet door locks use structures such as pin tumbler locks, leaf spring locks, or electronic locks. Among them, mechanical cabinet door locks are widely used due to their low cost and high stability. These locks typically include components such as a lock case, bolt, and lock cylinder. The lock cylinder is driven to rotate by a key or handle, which in turn rotates the lock to open and close the cabinet door.

[0004] However, in practical applications, existing cabinet door locks still have some shortcomings. First, in some locks, the lock cylinder lacks an effective limiting structure when locked or unlocked, making it prone to unexpected rotation due to external vibration or misoperation. This can lead to accidental unlocking or inability to unlock properly, affecting security and reliability. Second, to achieve lock cylinder positioning, traditional designs often employ complex spring ball positioning mechanisms or multi-stage slotted joints. This not only results in a large number of parts and complex assembly processes but also makes the lock prone to wear, jamming, or positioning failure after long-term use, reducing product durability. Therefore, this application addresses these technical problems by making improvements. Utility Model Content

[0005] This utility model proposes a novel cabinet door lock, which solves the aforementioned problems existing in the use of the prior art.

[0006] The technical solution of this utility model is implemented as follows: A novel cabinet door lock includes a lock sleeve, a lock cylinder, a lock tongue, and a fixing screw. The lock sleeve has a lock cylinder mounting port that extends through the middle from front to back. The lock cylinder is rotatably installed in the lock cylinder mounting port. The rear end of the lock cylinder protrudes from the lock sleeve and is connected to the lock tongue through the fixing screw. The lock sleeve has a positioning step arranged in a ring shape in the middle of the inner side of the lock cylinder mounting port. At least two positioning slots are provided on the positioning step. A positioning block is integrally formed on the outer wall of the lock cylinder. The positioning slots are located on the rotation trajectory of the positioning block as the lock cylinder rotates. An elastic element is provided between the lock tongue and the lock sleeve.

[0007] Preferably, there are four positioning slots arranged circumferentially at equal intervals, and two positioning blocks arranged symmetrically.

[0008] Preferably, the positioning step has two symmetrically arranged rotation limiting grooves, and the outer wall of the lock cylinder has an integrally formed limiting block that is rotatably disposed in the rotation limiting groove. The limiting block can rotate 90 degrees within the rotation limiting groove.

[0009] Preferably, the limiting block is located behind the positioning block, the rotating limiting groove is located inside the positioning slot, and every two positioning slots are correspondingly set at both ends of a rotating limiting groove.

[0010] Preferably, both sides of the positioning bayonet are provided with inclined chamfers.

[0011] Preferably, the elastic element is a wave spring.

[0012] Preferably, the rear end of the lock cylinder includes a square insert, the lock tongue has an opening for inserting the square insert, the fixing screw passes through the lock tongue and is threaded onto the rear end of the lock cylinder, and the fixing screw has a notched washer located at the rear end of the lock tongue.

[0013] Preferably, the front side of the lock sleeve is integrally formed with a front mounting plate, and two positioning posts are symmetrically arranged on the rear side of the front mounting plate. The outer wall of the lock sleeve is provided with an external thread, and a fastening nut is threaded onto the external thread. The fastening nut is provided with a plurality of piercing tips on the side facing the front mounting plate.

[0014] In summary, the beneficial effects of this utility model are as follows: 1. This utility model features an annular positioning step within the lock cylinder mounting opening of the lock sleeve, with at least two positioning slots on the step. This, combined with an integrally formed positioning block on the outer side of the lock cylinder, creates a mechanical automatic positioning structure. When the lock cylinder rotates, the positioning block enters or disengages from the positioning slots along its rotation trajectory. Under the action of the elastic element, it is pressed into the positioning slots, thus reliably limiting the lock cylinder's position in both locked and unlocked states. This prevents unexpected rotation due to vibration or external force, significantly improving the lock's operational stability and security. This utility model boasts a simple structure, reliable positioning, smooth operation, convenient installation, and high durability.

[0015] 2. Four equidistant positioning slots are set around the circumference, which, together with two symmetrically positioned positioning blocks on the lock cylinder, allows the lock cylinder to complete a state switch (unlock ↔ lock) every 90 degrees of rotation, and achieves dual-point positioning support after each rotation. This symmetrical multi-point positioning design not only provides a clear and precise operating feel, but also effectively distributes the force on the lock cylinder during operation, reduces local wear, and extends its service life.

[0016] 3. A mechanical angle limiting mechanism is formed by setting a pair of symmetrical rotation limiting grooves on the positioning step and corresponding limiting blocks on the outer wall of the lock cylinder. The maximum allowable rotation angle of the limiting block within the rotation limiting groove is 90 degrees, which precisely limits the rotation range of the lock cylinder and avoids problems such as damage to the internal structure or incomplete movement of the bolt due to excessive rotation. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 for Figure 1 A schematic diagram of the structure when observed from another angle; Figure 3 This is an exploded view of the first structure of this utility model; Figure 4 This is an exploded view of the second structure of this utility model; Figure 5 This is a front view of the lock sleeve in this utility model; Figure 6 This is a perspective view of the lock sleeve in this utility model; Figure 7 This is the front view of the present invention; Figure 8 for Figure 7 Schematic diagram of the cross-sectional structure along the AA direction; Figure 9 for Figure 7 Schematic diagram of the cross-sectional structure along the BB direction.

[0019] In the diagram: 1. Lock sleeve; 11. Lock cylinder mounting port; 12. Positioning step; 13. Positioning bayonet; 14. Inclined chamfer; 15. Rotation limit groove; 16. External thread; 2. Mounting front plate; 21. Positioning pin; 3. Lock cylinder; 31. Positioning block; 32. Limiting block; 33. Square insert; 4. Lock tongue; 41. Insertion port; 5. Fixing screw; 6. Notched washer; 7. Wave spring; 8. Fastening nut; 81. Piercing tip. Detailed Implementation

[0020] The following will refer to the appendix in the embodiments of this utility model. Figure 1-9The technical solutions in the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] Example: like Figures 1 to 9 As shown, this utility model discloses a novel cabinet door lock. The overall structure is mainly composed of a lock sleeve 1, a lock cylinder 3, a lock tongue 4, a wave spring 7, a fixing screw 5, and a fastening nut 8. The components work together to achieve reliable locking and convenient opening of the cabinet door, and effectively limit the lock cylinder 3 in the open / closed state to ensure stability and security during use.

[0022] Specifically, the lock sleeve 1 serves as the main support structure of the entire lock, with a lock cylinder mounting port 11 extending through its center to accommodate and position the lock cylinder 3. The lock cylinder 3 rotates relative to the lock sleeve 1 by engaging with the inner wall of the lock cylinder mounting port 11 on its outer periphery. The front end of the lock cylinder 3 is exposed on the front side of the lock sleeve 1 for inserting a key for operation; its rear end protrudes from the rear of the lock sleeve 1 and is connected to the bolt 4 via a fixing screw 5 to drive the bolt 4 to move synchronously. A wave spring 7 is provided between the bolt 4 and the lock sleeve 1. A ring-shaped positioning step 12 is integrally formed in the center of the inner side of the lock cylinder mounting port 11. At least two positioning slots 13 are provided on the positioning step 12 (four in this embodiment), evenly distributed circumferentially. These positioning slots 13 are arranged circumferentially to form multiple stable stopping positions for engaging with the positioning block 31 on the lock cylinder 3 to achieve automatic positioning of the lock cylinder 3 at specific angles. Two symmetrically arranged positioning blocks 31 are integrally injection molded or machined onto the outer wall of the lock cylinder 3. When the lock cylinder 3 rotates, the positioning blocks 31 move circumferentially, their trajectory passing precisely through the areas of each positioning slot 13. When the lock cylinder 3 is stationary (i.e., after completing the unlocking or locking action), the positioning blocks 31 are pressed into the corresponding positioning slots 13 under the action of the elastic element, thereby restricting the lock cylinder 3 from continuing to rotate and preventing accidental operation. To facilitate the smooth sliding of the positioning blocks 31 into or out of the positioning slots 13, inclined chamfers 14 are provided on both sides of each positioning slot 13. These chamfers serve as guides, allowing the lock cylinder 3 to overcome elastic resistance and smoothly transition to the next positioning position during rotation, improving the operating feel and service life.

[0023] Furthermore, two symmetrically arranged rotation limiting grooves 15 are formed on the positioning step 12. These rotation limiting grooves 15 are located in the inner area of ​​the positioning slots 13, that is, on the side closer to the central axis of the lock cylinder 3. Correspondingly, a limiting block 32 is integrally formed on the outer wall of the lock cylinder 3, which is rotatably disposed within the rotation limiting groove 15. The limiting block 32 is located behind the positioning block 31, and the limiting block 32 can rotate 90 degrees within the rotation limiting groove 15. Each pair of positioning slots 13 is correspondingly arranged at both ends of one rotation limiting groove 15. Since each pair of adjacent positioning slots 13 is respectively located at both ends of a rotation limiting groove 15, when the limiting block 32 abuts against one end of the rotation limiting groove 15, the corresponding positioning block 31 falls exactly into one positioning slot 13, indicating that the lock is in a certain state (such as the locked state). When the key drives the lock cylinder 3 to rotate 90 degrees in the opposite direction, the limiting block 32 reaches the other end, and at the same time, the positioning block 31 disengages from the original positioning slot 13 and enters another positioning slot 13, completing the state switch. This dual limiting mechanism—including both the functional positioning formed by the positioning block 31 and the positioning slot 13, and the angular mechanical limiting formed by the limiting block 32 and the rotation limiting groove 15—significantly improves the accuracy and reliability of the rotation of the lock cylinder 3, avoiding over-rotation or under-rotation.

[0024] A wave spring 7, located between the bolt 4 and the lock sleeve 1, is fitted onto the rear shaft section of the lock cylinder 3. One end abuts against the rear end face of the lock sleeve 1, and the other end abuts against the front side of the bolt 4. The wave spring 7 is characterized by its small size, uniform elasticity, and good fatigue resistance, enabling it to maintain a stable thrust output during long-term compression and rebound. This elastic element continuously applies a rearward thrust (away from the lock sleeve 1) to the bolt 4, thereby subjecting the lock cylinder 3 to a rearward axial force, forcing the positioning block 31 to remain firmly against the bottom of the positioning slot 13, enhancing the positioning stability. When the user turns the lock cylinder 3 with the key, this elastic force must be overcome to cause a slight axial compression in the lock cylinder 3, allowing the positioning block 31 to climb along the inclined chamfer 14 and disengage from the current positioning slot 13, entering the next position. Once rotated to the correct position, the elastic element releases energy again, pushing the positioning block 31 quickly into the new positioning slot 13, producing a clear "click" sound and providing clear operational feedback.

[0025] In this invention, the rear end of the lock cylinder 3 includes a square insert 33, and the latch 4 has a slot 41 for inserting the square insert 33. After the square insert 33 is inserted into the slot 41, a reliable anti-rotation connection structure is formed, ensuring that the rotational movement of the lock cylinder 3 can be efficiently transmitted to the latch 4, driving it to rotate synchronously. To fix the connection between the latch 4 and the lock cylinder 3, a fixing screw 5 passes through the through hole on the latch 4 from the rear and is then threaded into the internal threaded hole at the rear end of the lock cylinder 3. This connection method is convenient for disassembly and assembly, and facilitates later maintenance and replacement of parts. A notched washer 6 is also provided between the head of the fixing screw 5 and the latch 4, which has the effect of preventing loosening and locking.

[0026] In this invention, the front side of the lock sleeve 1 is integrally formed with a mounting front plate 2. Two symmetrically arranged positioning posts 21 are located on the rear side of the mounting front plate 2. An external thread 16 is formed on the outer wall of the lock sleeve 1, and a fastening nut 8 is threaded onto the external thread 16. Several piercing tips 81 are provided on the side of the fastening nut 8 facing the mounting front plate 2. When the lock is inserted into the preset mounting hole from the outside of the cabinet door, the two positioning posts 21 can be inserted into the corresponding positioning holes on the cabinet door panel, achieving rapid positioning and anti-rotation functions. The lock sleeve 1 has external thread 16 segments on its outer circumference, and the matching fastening nut 8 can be tightened from the inside of the cabinet door by threaded engagement, firmly fixing the entire lock to the cabinet door. During tightening, the piercing tips 81 will pierce into the surface of the metal or wooden cabinet door panel, forming tiny engagement points, effectively preventing the lock from loosening or even falling off due to long-term vibration or external impact, greatly improving the stability of the installation and the reliability of long-term use.

[0027] It should also be noted that the terms used in this utility model, such as "front", "rear", "vertical", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this utility model.

[0028] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A novel cabinet door lock, characterized in that: The lock includes a lock sleeve, a lock cylinder, a bolt, and fixing screws. The lock sleeve has a through-hole for mounting the lock cylinder, which is rotatably mounted inside the mounting hole. The rear end of the lock cylinder protrudes from the lock sleeve and is connected to the bolt via the fixing screws. The lock sleeve has a ring-shaped positioning step in the middle of the inner side of the mounting hole, and at least two positioning slots are provided on the positioning step. A positioning block is integrally formed on the outer wall of the lock cylinder, and the positioning slots are located on the rotation trajectory of the positioning block as the lock cylinder rotates. An elastic element is provided between the bolt and the lock sleeve.

2. The novel cabinet door lock according to claim 1, characterized in that: The positioning slots are arranged circumferentially at equal intervals, and the positioning blocks are arranged symmetrically in two places.

3. A novel cabinet door lock according to claim 2, characterized in that: The positioning step has two symmetrically arranged rotation limiting grooves. The outer wall of the lock cylinder has an integrally formed limiting block that is rotatably disposed in the rotation limiting groove. The limiting block can rotate 90 degrees within the rotation limiting groove.

4. A novel cabinet door lock according to claim 3, characterized in that: The limiting block is located behind the positioning block, and the rotating limiting groove is located inside the positioning slot, with each pair of positioning slots corresponding to the two ends of a rotating limiting groove.

5. A novel cabinet door lock according to claim 1, characterized in that: Both sides of the positioning bayonet are provided with inclined chamfers.

6. A novel cabinet door lock according to claim 1, characterized in that: The elastic element is a wave spring.

7. A novel cabinet door lock according to claim 1, characterized in that: The rear end of the lock cylinder includes a square insert, and the lock tongue has a slot for inserting the square insert. The fixing screw passes through the lock tongue and is threaded onto the rear end of the lock cylinder. The fixing screw has a notched washer located at the rear end of the lock tongue.

8. A novel cabinet door lock according to claim 1, characterized in that: The front side of the lock sleeve is integrally formed with a front mounting plate. Two positioning posts are symmetrically arranged on the rear side of the front mounting plate. The outer wall of the lock sleeve is provided with an external thread, and a fastening nut is threaded onto the external thread. Several piercing tips are provided on the side of the fastening nut facing the front mounting plate.

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