Anti-theft lock cylinder

Abstract

This utility model discloses an anti-theft lock cylinder, including a lock shell with an opening groove in the middle and lock holes at both ends. An inner lock cylinder structure and an outer lock cylinder structure are respectively installed in the lock holes. An unlocking fork is installed in the opening groove. A compression spring is provided between the outer and inner lock cylinders, and a driving spring is provided between the inner lock cylinder and the unlocking fork. The inner lock cylinder structure includes a retractable horizontal ball structure, which includes a telescopic groove on the outer wall of the inner lock cylinder structure, a lifting spring located in the telescopic groove, and a horizontal ball partially sliding out of the telescopic groove driven by the lifting spring. A strip-shaped limiting groove is provided on the inner wall of the unlocking fork. The horizontal ball includes a cylindrical base and a frustum-shaped ball block. The cross-section of the ball block gradually increases from the end connected to the base towards the other end, and the end of the ball block also has an arc-shaped end face. This utility model improves the anti-pry and anti-theft performance of the lock cylinder, greatly enhancing the overall security of the lock.

Description

Technical Field

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

[0002] Existing single-keyhole lock cylinders generally consist of two cylinders, with two corresponding keyholes on the lock housing. The outer cylinder, located on the outside of the door, has a keyhole for unlocking from the outside, while the inner cylinder, located on the inside of the door, connects to an unlocking handle. An opening groove is formed between the two keyholes in the lock housing, within which an unlocking fork is positioned. The inner cylinder is inserted into the outer cylinder by one end of the unlocking fork, and the outer cylinder is inserted into the inner cylinder by the other end. A spring is positioned between the inner and outer cylinders to provide resistance. To unlock, the key engages with the outer cylinder, rotating it and causing the unlocking fork to rotate, thus unlocking the lock. The inner cylinder has a retractable ball bearing, and the unlocking fork has a limiting groove. Under normal conditions, the ball bearing abuts against the inner wall of the unlocking fork. If the outer cylinder structure is forcibly damaged, the ball bearing engages with the limiting groove, locking the unlocking fork and preventing thieves from forcibly unlocking it by rotating the unlocking fork.

[0003] Existing horizontal top beads on the market consist of a cylindrical base and a cylindrical top bead block. The cross-section of the top bead block is smaller than that of the base. When the horizontal top bead engages with the limiting groove on the unlocking fork, the top bead block is engaged within the limiting groove. When the outer lock cylinder is violently broken, unauthorized components can use tools such as screwdrivers to continuously vibrate the undamaged parts, using the vibration to displace the horizontal top bead, causing it to disengage from the limiting groove, thereby rotating the unlocking fork to forcibly unlock the lock. Based on the above problems, this application proposes a lock cylinder that enhances the anti-pry and anti-theft performance of the lock. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an anti-theft lock cylinder that is not easily opened by technology after being subjected to violent damage and has a higher security performance.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an anti-theft lock cylinder, including a lock shell, an opening groove in the middle of the lock shell, and lock holes at both ends corresponding to the opening groove. An inner lock cylinder structure and an outer lock cylinder structure are respectively assembled in the lock holes. An unlocking fork is provided in the opening groove. One end of the inner lock cylinder structure extends into the unlocking fork, and the other end of the outer lock cylinder extends into the unlocking fork. A compression spring is provided between the outer and inner lock cylinders, and a driving spring is provided between the inner lock cylinder and the unlocking fork. The inner locking cylinder structure includes a retractable horizontal top ball structure. The horizontal top ball structure includes a telescopic groove on the outer wall of the inner locking cylinder structure, a lifting spring located in the telescopic groove, and a horizontal top ball that is partially slid out of the telescopic groove by the lifting spring. The inner wall of the unlocking fork is provided with a strip-shaped limiting groove. The horizontal top ball includes a cylindrical base and a top ball block in the shape of a frustum. The cross-section of the top ball block gradually increases from the end connected to the base toward the other end. The end of the top ball block is also provided with an arc-shaped end face.

[0006] The present invention is further configured such that the maximum cross-sectional diameter of the top bead block is 2.6 mm, the minimum cross-sectional diameter is 2.3 mm, and its axial height is 2.5 mm.

[0007] The present invention is further configured such that: the tail end of the base is provided with a concave groove, the groove cooperates with the ejector spring, and the axial height of the base is 2.9mm.

[0008] The present invention is further configured such that the base and the top bead block are integrally formed.

[0009] By adopting the above technical solution, it has the functions of anti-vibration and anti-pry. The frustum-shaped top ball block forms a wedge-shaped self-locking mechanism that becomes tighter with vibration in the limiting groove: when criminals use tools such as screwdrivers to knock or rotate the remaining lock cylinder, the top ball block is continuously slid towards the bottom of the groove under the action of axial component force, and the contact area and friction force increase simultaneously, completely blocking the path of the horizontal top ball being shaken out, solving the drawback of the cylindrical top ball block being easily shaken out, and greatly improving the security performance of the lock cylinder. Attached Figure Description

[0010] Figure 1 This is an exploded view of the structure of this utility model;

[0011] Figure 2 This is a schematic diagram of the structure of this utility model;

[0012] Figure 3 This is a cross-sectional view of the present invention;

[0013] Figure 4 This is a cross-sectional view of the transverse bead structure;

[0014] Figure 5 This is a schematic diagram of the structure of the horizontal top bead.

[0015] 1. Lock case; 2. Inner lock cylinder structure; 20. Telescopic groove; 3. Outer lock cylinder structure; 4. Unlocking fork; 40. Limiting groove; 5. Compression spring; 6. Drive spring; 7. Lifting spring; 8. Horizontal top ball; 80. Top ball block; 81. Base; 82. Arc-shaped end face; 83. Groove. Detailed Implementation

[0016] Reference Figures 1 to 5 The embodiments of this utility model will be further described below.

[0017] An anti-theft lock cylinder includes a lock shell 1. An opening groove is provided in the middle of the lock shell 1. Lock holes are provided at both ends of the opening groove. An inner lock cylinder structure 2 and an outer lock cylinder structure 3 are respectively installed in the lock holes. An unlocking fork 4 is provided in the opening groove. One end of the inner lock cylinder structure 2 extends into the unlocking fork 4, and the other end of the outer lock cylinder extends into the unlocking fork 4. A compression spring 5 is provided between the outer and inner lock cylinders. A drive spring 6 is provided between the inner lock cylinder and the unlocking fork 4. A retractable horizontal top bead 8 structure is provided inside the inner lock cylinder structure. The horizontal top bead 8 structure includes components located within the inner lock cylinder structure. The outer wall has a telescopic groove 20, a lifting spring 7 located in the telescopic groove 20, and a horizontal top bead 8 that is partially slid out of the telescopic groove 20 by the lifting spring 7. The inner wall of the unlocking fork 4 is provided with a strip-shaped limiting groove 40. The horizontal top bead 8 includes a cylindrical base 81 and a frustum-shaped top bead block 80. The cross-section of the top bead block 80 gradually increases from the end connected to the base 81 toward the other end. The end of the top bead block 80 is also provided with an arc-shaped end face 82. When the horizontal top bead 8 abuts against the inner wall of the unlocking fork 4, the arc-shaped end face 82 can reduce the friction between it and the inner wall.

[0018] The top bead block 80 has a maximum cross-sectional diameter of 2.6 mm, a minimum cross-sectional diameter of 2.3 mm, and an axial height of 2.5 mm. The base 81 has a recessed groove 83 at its tail end, which cooperates with the ejector spring. The axial height of the base 81 is 2.9 mm. The base 81 and the top bead block 80 are integrally formed.

[0019] When the outer lock cylinder structure 3 is violently damaged, the unlocking fork 4 is pushed towards the outer lock cylinder mechanism by the force of the drive spring 6, causing the limiting groove 40 to move to the position of the horizontal top bead 8. The horizontal top bead 8 is driven by the force of the lifting spring 7 to lock the top bead block 80 into the limiting groove 40, thus locking the unlocking fork 4. When criminals try to disengage the horizontal top bead 8 from the limiting groove 40 by vibrating the inner lock cylinder structure 2, the improved frustum-shaped structure of the top bead block 80 prevents it from disengaging from the limiting groove 40 after simple vibration. The unlocking fork 4 then cannot operate, preventing the lock cylinder from being forcibly opened, thus improving the lock cylinder's security performance.

[0020] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. An anti-theft lock cylinder, comprising a lock shell, an opening groove in the middle of the lock shell, and lock holes at both ends corresponding to the opening groove, wherein an inner lock cylinder structure and an outer lock cylinder structure are respectively assembled in the lock holes, an unlocking fork is provided in the opening groove, one end of the inner lock cylinder structure extends into the unlocking fork, and one end of the outer lock cylinder extends into the unlocking fork from the other end, a compression spring is provided between the outer lock cylinder and the inner lock cylinder, and a driving spring is provided between the inner lock cylinder and the unlocking fork, characterized in that: The inner locking cylinder structure is equipped with a retractable horizontal top ball structure. The horizontal top ball structure includes a telescopic groove on the outer wall of the inner locking cylinder structure, a lifting spring located in the telescopic groove, and a horizontal top ball that is partially slid out of the telescopic groove by the lifting spring. The inner wall of the unlocking fork is equipped with a strip-shaped limiting groove. The horizontal top ball includes a cylindrical base and a top ball block in the shape of a frustum. The cross-section of the top ball block gradually increases from the end connected to the base toward the other end. The end of the top ball block is also equipped with an arc-shaped end face.

2. The anti-theft lock cylinder according to claim 1, characterized in that: The maximum cross-sectional diameter of the top bead block is 2.6 mm, the minimum cross-sectional diameter is 2.3 mm, and its axial height is 2.5 mm.

3. The anti-theft lock cylinder according to claim 2, characterized in that: The base has a recessed groove at its tail end, which cooperates with the ejector spring. The axial height of the base is 2.9 mm.

4. The anti-theft lock cylinder according to claim 3, characterized in that: The base and the top bead block are integrally formed.

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