Multi-stage locking structure of mechanical lock
By designing a multi-level locking structure and using components such as staggered keyholes and limit slots, the problem of traditional mechanical locks being easily cracked has been solved, achieving higher security and convenience.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHONGSHAN DAHAN SECURITY TECH CO LTD
- Filing Date
- 2025-05-23
- Publication Date
- 2026-05-05
AI Technical Summary
Traditional mechanical locks have a relatively simple locking structure, low security, and are easily cracked by criminals using technical means, failing to meet the ever-increasing security needs.
Design a multi-level locking structure for a mechanical lock, using a lock cylinder shaft including a first core and a second core, with the keyholes set in a staggered manner. The multi-level unlocking process increases the difficulty of unlocking, and the structure of limiting grooves, limiting flanges, springs and tumbler assemblies achieves stable and reliable locking and unlocking.
It improves the security of mechanical locks, increases the difficulty of unlocking, effectively prevents illegal unlocking, and maintains ease of use and reliability of the locked state.
Smart Images
Figure CN224200402U_ABST
Abstract
Description
Technical Field
[0001] This utility model specifically relates to a multi-level locking structure for a mechanical lock. Background Technology
[0002] A lock cylinder generally consists of a lock shell, a cylinder shaft, and a turntable. Inserting a key into the cylinder shaft unlocks it, allowing it to rotate within the lock shell. This rotation of the cylinder shaft then drives the turntable, unlocking the lock. In modern society, mechanical locks are widely used as an important security device in various doors, windows, cabinets, and other similar applications. Traditional mechanical locks typically have a simple locking structure, using a single tumbler assembly to lock and unlock the cylinder shaft and lock shell. However, this simple locking method has significant limitations; its security is low, making it vulnerable to hacking by criminals using technical means (such as prying or using tin foil to pick locks), and it fails to meet the ever-increasing demands for security protection. Utility Model Content
[0003] In view of the defects of the existing technology, the technical problem to be solved by this utility model is to provide a multi-level locking structure for a mechanical lock.
[0004] A multi-level locking structure for a mechanical lock includes a lock cylinder shaft and a lock cylinder housing. The lock cylinder housing has a receiving cavity, and the lock cylinder shaft is rotatably disposed within the receiving cavity. A plurality of tumbler assemblies are provided between the lock cylinder shaft and the lock cylinder housing. One end of the lock cylinder shaft is connected to an actuating element. The lock cylinder shaft includes a first shaft core and a second shaft core. A first keyhole is provided on the first shaft core along its central length direction, and a second keyhole is provided on the second shaft core along its central length direction. The first keyhole and the second keyhole have the same structural size and are arranged on the same central axis.
[0005] The second shaft and the first shaft are rotatably disposed in the receiving cavity with the same central axis. The first shaft can move closer to or further away from the second shaft along the length direction of the receiving cavity. A first limiting groove is recessed on one side of the first shaft, and a limiting flange is provided on one side of the receiving cavity that protrudes from the first limiting groove. The limiting flange and the first limiting groove cooperate to limit the displacement distance and rotation angle of the first shaft. The second shaft is connected to the actuating member. Initially, the first keyhole and the second keyhole are misaligned.
[0006] In one embodiment, a first spring is abutting between the first shaft core and the second shaft core below the first keyhole.
[0007] In one embodiment, a second limiting groove is recessed along the circumference on the outer side of the second shaft core, and a nut screw is threadedly inserted into one side of the lock core housing, with one end of the nut screw extending into the second limiting groove.
[0008] In one embodiment, an annular gap is provided between the outer side of the second shaft core and the receiving cavity, and a torsion spring is provided in the annular gap to abut against the inner side of the receiving cavity.
[0009] In one embodiment, the ball assembly includes a second spring, an upper ball, and a lower ball. A first ball hole is recessed on one side of the receiving cavity. The lower ball is movably disposed within the first ball hole. The second spring abuts against the bottom of the first ball hole and the end of the lower ball. A second ball hole communicating with a first keyhole is provided through the first shaft core. The second ball hole and the first ball hole are coaxially aligned and correspond one-to-one. The upper ball is movably disposed within the second ball hole and is in close contact with the end of the lower ball.
[0010] In summary, the advantages of this utility model over the prior art are:
[0011] In this invention, the lock cylinder shaft includes a first shaft and a second shaft. Initially, the first keyhole and the second keyhole are misaligned. When a specific key is inserted into the first keyhole of the first shaft, the tumbler assembly connecting the first shaft and the lock cylinder housing is unlocked by the key. Then, the first shaft is rotated so that the first keyhole and the second keyhole are aligned. At this time, the user can press the key to move the first shaft along the length of the receiving cavity toward the second shaft, so that the end of the key is simultaneously inserted into the second keyhole. Only then can the door lock be unlocked by rotating the second shaft (connected to the toggle). This multi-level locking design increases the difficulty of unlocking, greatly improves the security of the mechanical lock, and effectively prevents illegal unlocking. Attached Figure Description
[0012] Figure 1 This is one of the cross-sectional structural schematic diagrams of a multi-level locking structure of a mechanical lock in one embodiment of the present invention;
[0013] Figure 2 This is a second cross-sectional schematic diagram of a multi-level locking structure of a mechanical lock in one embodiment of the present invention;
[0014] Figure 3 This is the third cross-sectional schematic diagram of a multi-level locking structure of a mechanical lock in one embodiment of the present invention;
[0015] Figure 4 This is a perspective view of a multi-level locking structure of a mechanical lock in one embodiment of the present invention. Detailed Implementation
[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:
[0017] like Figures 1 to 4The present invention preferably provides a multi-level locking structure for a mechanical lock, including a lock cylinder shaft and a lock cylinder housing 1. The lock cylinder housing 1 has a receiving cavity 2, and the lock cylinder shaft is rotatably disposed within the receiving cavity 2. A plurality of tumbler assemblies 3 are provided between the lock cylinder shaft and the lock cylinder housing 1. One end of the lock cylinder shaft is connected to an actuating element 4. The lock cylinder shaft is characterized in that: the lock cylinder shaft includes a first shaft 5 and a second shaft 6. The first shaft 5 has a first keyhole 7 along its central length direction, and the second shaft 6 has a second keyhole 8 along its central length direction. The first keyhole 7 and the second keyhole 8 have a large structural design. The two shafts are identical and arranged on the same central axis; wherein, the second shaft core 6 and the first shaft core 5 are respectively rotatably arranged on the same central axis in the receiving cavity 2, and the first shaft core 5 can move closer to or further away from the second shaft core 6 along the length direction of the receiving cavity 2. A first limiting groove 9 is recessed in one side of the first shaft core 5, and a limiting flange 10 is provided on one side of the receiving cavity 2 protruding from the first limiting groove 9. The limiting flange 10 and the first limiting groove 9 cooperate to limit the displacement distance and rotation angle of the first shaft core 5. The second shaft core 6 is connected to the actuating member 4; initially, the first keyhole 7 and the second keyhole 8 are misaligned.
[0018] Specifically, by cooperating with the first limiting groove recessed on one side of the first shaft core and the limiting flange protruding on one side of the receiving cavity, the displacement and rotation angle of the first shaft core can be precisely limited, avoiding excessive displacement or arbitrary rotation of the first shaft core during movement, thus ensuring the stability of the relative movement between the lock cylinder shaft and the lock cylinder shell.
[0019] The lock cylinder shaft includes a first shaft and a second shaft. Initially, the first keyhole and the second keyhole are misaligned, and the first shaft is locked due to the tumbler assembly. When a specific key is inserted into the first keyhole of the first shaft, the tumbler assembly connecting the first shaft and the lock cylinder housing is unlocked by the key. Then, the first shaft is rotated so that the first keyhole and the second keyhole are aligned. At this time, the user can press the key to move the first shaft along the length of the receiving cavity towards the second shaft, so that the end of the key is simultaneously inserted into the second keyhole. Only then can the door lock be unlocked by rotating the second shaft (connected to the toggle). This multi-level locking design increases the difficulty of unlocking, greatly improves the security of the mechanical lock, and effectively prevents illegal unlocking.
[0020] Furthermore, a first spring 11 is located below the first keyhole 7 between the first shaft core 5 and the second shaft core 6. When the user unlocks and releases the key, the first shaft core automatically moves away from the second shaft core under the action of the first spring. At this point, the user only needs to rotate the key to re-engage and lock the first shaft core with the tumbler assembly, improving the ease of use of the mechanical lock while also ensuring the reliability of the locked state.
[0021] Furthermore, a second limiting groove 12 is recessed along the circumference of the outer side of the second shaft core 6, and a grommet screw 13 is threadedly inserted into one side of the lock cylinder housing 1, with one end of the grommet screw 13 extending into the second limiting groove 12. Specifically, the engagement of the second limiting groove recessed along the circumference of the outer side of the second shaft core with the grommet screw threaded into one side of the lock cylinder housing restricts the rotation angle of the second shaft core, further improving the stability and reliability of the entire locking structure.
[0022] Furthermore, an annular gap is left between the outer side of the second shaft core 6 and the receiving cavity 2, and a torsion spring is provided in the annular gap to abut against the inner side of the second shaft core 6 and the receiving cavity 2. Thus, through the torsion spring, when the key is disengaged from the second keyhole, the second shaft core can be reset and rotated, causing the second keyhole to re-misalign with the first keyhole.
[0023] Furthermore, the ball assembly 3 includes a second spring 31, an upper ball 32, and a lower ball 33. A first ball hole 34 is recessed on one side of the receiving cavity 2. The lower ball 33 is movably disposed in the first ball hole 34. The second spring 31 abuts against the bottom of the first ball hole 34 and the end of the lower ball 33. A second ball hole 35 communicating with the first keyhole 7 is provided through the first shaft core 5. The second ball hole 35 and the first ball hole 34 are coaxially arranged in a one-to-one correspondence. The upper ball 32 is movably disposed in the second ball hole 35 and is in close contact with the end of the lower ball 33.
[0024] Specifically, the pin assembly is a relatively mature existing technology, including a second spring, an upper pin, and a lower pin. The first pin hole on one side of the receiving cavity corresponds one-to-one with the second pin hole on the first shaft core and is set on the same central axis. The upper pin is movably disposed in the second pin hole and is in close contact with the end of the lower pin. In this structural design, when there is no key, the lower pin can be partially housed in the second pin hole of the first shaft core due to the force of the second spring, achieving locking between the first shaft core and the lock cylinder shell. When the key is inserted, the positions of the upper and lower pins are accurately adjusted according to the tooth shape of the key, and the lower pin disengages to achieve locking and unlocking between the lock cylinder shaft and the lock cylinder shell. The working process is stable and reliable, improving the performance of the mechanical lock.
[0025] The foregoing has shown and described the basic principles and main features of this utility model, as well as its advantages. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A multi-level locking structure for a mechanical lock, comprising a lock cylinder shaft and a lock cylinder housing (1), wherein the lock cylinder housing (1) has a receiving cavity (2), the lock cylinder shaft is rotatably disposed within the receiving cavity (2), a plurality of tumbler assemblies (3) are provided between the lock cylinder shaft and the lock cylinder housing (1), and one end of the lock cylinder shaft is connected to an actuating element (4), characterized in that: The lock cylinder shaft includes a first shaft (5) and a second shaft (6). The first shaft (5) is provided with a first keyhole (7) along its central length direction, and the second shaft (6) is provided with a second keyhole (8) along its central length direction. The first keyhole (7) and the second keyhole (8) have the same size and are arranged on the same central axis. The second shaft core (6) and the first shaft core (5) are respectively rotatably arranged in the receiving cavity (2) with the same central axis. The first shaft core (5) can move closer to or further away from the second shaft core (6) along the length direction of the receiving cavity (2). A first limiting groove (9) is recessed in one side of the first shaft core (5). A limiting flange (10) is provided on one side of the receiving cavity (2) protruding from the first limiting groove (9). The limiting flange (10) and the first limiting groove (9) cooperate to limit the displacement distance and rotation angle of the first shaft core (5). The second shaft core (6) is connected to the actuating member (4). Initially, the first keyhole (7) and the second keyhole (8) are misaligned.
2. The multi-level locking structure of a mechanical lock according to claim 1, characterized in that: A first spring (11) is located below the first keyhole (7) between the first shaft core (5) and the second shaft core (6).
3. The multi-level locking structure of a mechanical lock according to claim 1, characterized in that: The second shaft core (6) has a second limiting groove (12) recessed along the circumference on the outer side. The lock core shell (1) is threadedly connected to a nut screw (13) on one side, and one end of the nut screw (13) extends into the second limiting groove (12).
4. The multi-level locking structure of a mechanical lock according to claim 1, characterized in that: An annular gap is left between the outer side of the second shaft core (6) and the receiving cavity (2), and a torsion spring is provided in the annular gap to abut against the inner side of the second shaft core (6) and the receiving cavity (2).
5. The multi-level locking structure of a mechanical lock according to claim 1, characterized in that: The ball assembly (3) includes a second spring (31), an upper ball (32) and a lower ball (33). The receiving cavity (2) has a recessed first ball hole (34) on one side. The lower ball (33) is movably disposed in the first ball hole (34). The second spring (31) abuts between the bottom of the first ball hole (34) and the end of the lower ball (33). The first shaft core (5) is provided with a second ball hole (35) that communicates with the first key hole (7). The second ball hole (35) and the first ball hole (34) are arranged in a one-to-one correspondence with the central axis. The upper ball (32) is movably disposed in the second ball hole (35) and is in close contact with the end of the lower ball (33).