A pick-resistant lock cylinder

Abstract

This application discloses an anti-theft lock cylinder, including a lock housing and a lock cylinder body installed inside the lock housing. The lock housing has a pin hole, and an installation tube is installed inside the pin hole. The installation tube forms a channel inside, and internal components are provided inside the channel. The internal components include a pin, a spring, and a sealing block. A spring is fixedly installed inside the installation tube. The inner wall of the installation tube also has a relief groove to accommodate the deformation of the spring. The bottom side wall of the sealing block has a conical surface. The sealing block has an annular groove connecting the conical surface. During the process of the sealing block being pressed into the installation tube, the spring is deformed by the conical surface and pressed into the relief groove, and then springs into the annular groove to achieve self-locking.

Description

Technical Field

[0001] This utility model relates to the field of lock technology, specifically to an anti-theft lock cylinder. Background Technology

[0002] Locks, as an important tool for protecting property security, play an indispensable role in people's daily lives and production. Among them, mechanical anti-theft lock cylinders are widely used in various scenarios such as homes and commercial premises due to their simple structure, reliable use, and moderate cost.

[0003] In existing technology, mechanical anti-theft lock cylinders typically consist of a lock shell, a lock cylinder body, a key, and matching components such as pins, springs, and sealing blocks. Their basic working principle involves the key's teeth engaging with pins of varying lengths, ensuring the pins' separation surfaces align with the contact surfaces of the lock cylinder body and lock shell, thus enabling the lock to open. When the key is removed, the pins return to their original position under the action of the springs, achieving the locking function.

[0004] However, the sealing block structure lacks an effective anti-tamper design. When subjected to violent disassembly, the connection between the sealing block and the mounting tube is easily damaged. This is mainly because the existing connection structure only considers normal assembly requirements and does not have a locking mechanism designed against reverse forces, resulting in the disassembly force being far less than the force required to damage the internal structure of the lock cylinder. Although some anti-tamper structures can provide a certain degree of anti-tamper capability, such as reverse threaded connections, they often sacrifice assembly convenience. Complex connection structures not only increase production difficulty but may also lead to an increased component damage rate during assembly, affecting production efficiency and product quality stability. Utility Model Content

[0005] The present invention aims to provide an anti-theft lock cylinder that solves the problem that the sealing block and the mounting tube do not have a reverse force for locking in the prior art.

[0006] To address the above problems, this application provides the following technical solution: An anti-theft lock cylinder includes a lock housing and a lock cylinder body installed inside the lock housing. The lock housing has a pin hole, and an installation tube is installed inside the pin hole. The installation tube forms a channel inside, and internal components are provided inside the channel. The internal components include a pin, a spring, and a sealing block. A spring is fixedly installed inside the installation tube. The inner wall of the installation tube also has a relief groove to accommodate the deformation of the spring. The bottom side wall of the sealing block has a conical surface. The sealing block has an annular groove connecting the conical surface. During the process of the sealing block being pressed into the installation tube, the spring is deformed by the conical surface and pressed into the relief groove, and then springs into the annular groove to achieve self-locking.

[0007] The working principle and beneficial effects of this utility model: First, insert the tumbler into the channel, then insert the spring, and then insert the sealing block. A large compressive force is generated by a cylinder or other power tool to push the sealing block to the bottom of the channel. The conical surface at the bottom of the sealing block will gradually compress the spring, causing the spring to undergo elastic deformation and bend inward into the clearance groove. As the sealing block is continuously pressed in, when the annular groove moves to the position of the spring, the spring resets under its own elastic force and is embedded in the annular groove. The sealing block and the lock housing are then fixed with screws.

[0008] When disassembling, unscrew the screws and pull the sealing block outward. After the bottom of the annular groove contacts the spring, a large force is required to bend it due to the elasticity. Since there is no professional pulling tool and the top of the sealing block protrudes out of the channel with little force, it is impossible to generate enough force manually to bend and deform the spring. Thus, the spring restricts the sealing block from being pulled outward, thereby playing a self-locking and anti-theft role.

[0009] As a preferred embodiment, 2-4 spring pieces are evenly distributed along the circumferential direction of the inner wall of the mounting tube, with the free end of the spring pieces extending towards the center of the channel. This allows the spring pieces to produce uniform and moderate elastic deformation when compressed by the conical surface, ensuring that each spring piece can be synchronously embedded into the annular groove, forming a multi-point uniform locking.

[0010] As a preferred embodiment, the inclination angle of the conical surface is 15 to 30°. Using an inclination angle of 15 to 30° allows the conical surface to gently compress the spring sheet when the sealing block is pressed in, gradually converting the axial pressure into the radial deformation force of the spring sheet. This avoids excessive instantaneous impact force due to an excessively large angle or excessive assembly resistance due to an excessively small angle.

[0011] As a preferred embodiment, the inner wall of the mounting tube is provided with a positioning boss, and the top of the sealing block is provided with a limiting step that cooperates with the positioning boss. When the limiting step contacts the positioning boss, the spring piece is completely embedded in the annular groove.

[0012] The positioning boss on the inner wall of the mounting tube channel and the limiting step on the top of the sealing block form a mating structure. When the sealing block is pressed into the mounting tube, the limiting step gradually approaches the positioning boss. When the two contact, the sealing block reaches the preset position, at which point the spring is fully embedded in the annular groove, achieving precise locking. This structure ensures accurate mating between the spring and the annular groove through mechanical limiting, avoiding locking failure due to insufficient pressing depth or damage to internal parts due to excessive pressing depth.

[0013] As a preferred embodiment, the spring and the mounting tube are integrally stamped.

[0014] As a preferred embodiment, the bottom of the sealing block is a horizontal plane. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of an anti-theft lock cylinder according to this application; Figure 2 for Figure 1 A magnified view of a portion of the image; Figure 3 This is a structural diagram for disassembly.

[0016] The reference numerals in the accompanying drawings include: 1. Lock cylinder; 2. Lock body; 3. Sealing block; 4. Screw; 5. Clearance groove; 6. Spring; 7. Mounting tube; 8. Tumbler; 9. Annular groove; 10. Spring piece. Detailed Implementation

[0017] The following detailed description illustrates the specific implementation methods: The anti-theft lock cylinder 1 in this embodiment refers to... Figure 1 , Figure 2 It consists of four parts: lock housing 2, lock cylinder 1, mounting tube 7, and internal accessories. The material selection, structural parameters, and connection relationships of each component are as follows: The lock housing 2 is made of Q345 low-alloy high-strength steel, and the lock cylinder 1 is made of 316 stainless steel.

[0018] The mounting tube 7 and spring 10 are made of 60Si2Mn spring steel. The mounting tube 7 is cold-drawn and integrally quenched, and has a cylindrical hollow structure. It is fixed in the hole of the ball 8 through a transition fit. The inside of the mounting tube 7 forms a channel, and the inner wall of the channel integrates the spring 10 (the spring 10 is fixedly connected to the channel) and the clearance groove 5. The top of the spring 10 and the top of the clearance groove 5 abut against each other. The internal components include the ball 8, the spring 6, and the sealing block 3, which are assembled sequentially from top to bottom along the axial direction of the channel. The bottom of the sealing block 3 has a conical surface and a horizontal surface, and the middle has an annular groove 9. The top and the lock housing 2 are fixed by screws 4.

[0019] First, insert the tumbler 8 into the channel, then insert the spring 6, and then insert the sealing block 3. The sealing block 3 is pushed downward by the punch press to move it to the bottom of the channel. The conical surface at the bottom of the sealing block 3 will gradually squeeze the spring piece 10, causing the spring piece 10 to undergo elastic deformation and bend inward into the relief groove 5. As the sealing block 3 is continuously pressed in, when the annular groove 9 moves to the position of the spring piece 10, the spring piece 10 resets under its own elastic force and is embedded in the annular groove 9. The sealing block 3 and the lock housing 2 are then fixed by the screw 4.

[0020] Reference Figure 3 When disassembling, unscrew the screw 4 and pull the sealing block 3 outward. After the bottom of the annular groove 9 contacts the spring piece 10, the spring piece 10 locks the sealing block 3 in the opposite direction. The part of the top of the sealing block 3 that protrudes out of the channel has little force and no leverage point. It is impossible to generate enough force manually to make the spring piece 10 bend and deform. Thus, the spring piece 10 restricts the sealing block 3 from being pulled outward, thereby playing a self-locking and anti-theft role.

[0021] It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. An anti-theft lock cylinder, comprising a lock housing and a lock cylinder body installed within the lock housing, wherein the lock housing has a pin hole, an installation tube is installed within the pin hole, a channel is formed inside the installation tube, and internal components are provided within the channel, the internal components including a pin, a spring, and a sealing block; characterized in that: The installation tube is equipped with a spring piece inside, and the inner wall of the installation tube is also provided with a relief groove to accommodate the deformation of the spring piece. The side wall at the bottom of the sealing block has a conical surface, and the sealing block is provided with an annular groove connecting the conical surface. During the process of the sealing block being pressed into the installation tube, the spring piece is deformed by the conical surface and pressed into the relief groove, and then springs into the annular groove to achieve self-locking.

2. The anti-theft lock cylinder according to claim 1, characterized in that: Two to four spring pieces are evenly distributed along the circumference of the inner wall of the mounting tube, with the free end of the spring piece extending toward the center of the channel.

3. The anti-theft lock cylinder according to claim 2, characterized in that: The inclination angle of the conical surface is 15 to 30°.

4. The anti-theft lock cylinder according to claim 3, characterized in that: The inner wall of the mounting tube is provided with a positioning boss, and the top of the sealing block is provided with a limiting step that cooperates with the positioning boss. When the limiting step contacts the positioning boss, the spring piece is completely embedded in the annular groove.

5. The anti-theft lock cylinder according to claim 4, characterized in that: The spring and the mounting tube are integrally stamped.

6. The anti-theft lock cylinder according to claim 5, characterized in that: The bottom of the sealing block is a horizontal plane.

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