Pick resistant lock cylinder

Abstract

The utility model discloses a kind of anti-picking lock cylinder, the locking bead is cylindrically arranged, and its one end close to the bead is equipped with annular limiting groove, the annular limiting groove separates the locking bead into upper cylinder and lower round block, the compression spring is arranged on the upper cylinder, and the lower round block is moved to the opening of the locking hole one of inner lock bladder, the annular limiting groove is arranged along the circumference of locking bead, along the longitudinal cross section of locking bead, its height is 5mm-6mm, width is 2.6mm-2.8mm, wherein the transverse depth of annular limiting groove is 0.8mm-1mm, longitudinal height is 1.9-2.1mm.The utility model improves the structure of locking bead, so that it also has the function of anti-picking and anti-theft after suffering violent destruction, greatly enhances the safety performance of overall lock cylinder.

Description

Technical Field

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

[0002] Existing single-keyhole lock cylinders generally consist of two cylinders and two corresponding keyholes on the lock shell. The outer cylinder, located on the outside of the door, has a keyhole for unlocking from the outside. The inner cylinder, located on the inside of the door, has an unlocking handle connected to it. An opening groove is provided between the two keyholes on the lock shell, and an unlocking fork is installed in this groove. The inner cylinder has an unlocking device that controls its rotation relative to the lock shell, allowing it to remain stationary. This unlocking device includes a locking hole one on the inner cylinder and a corresponding locking hole two on the lock shell. Locking hole one contains a stop bead, and locking hole two contains a locking bead and a pressure spring that pushes the locking bead against the stop bead. When unlocking from the outside, the key engages with the lock cylinder, rotating the outer cylinder and driving the unlocking fork to achieve unlocking. When the door is unlocked, as the inner cylinder rotates, the edge of locking hole one presses against the locking bead, causing the locking bead to disengage from the inner cylinder. At this point, the inner cylinder can rotate relative to the lock shell, driving the unlocking fork to operate and achieving unlocking.

[0003] Most commonly used locking beads have a smooth cylindrical outer surface (see instruction manual). Figure 6 The inner lock cylinder has a beveled locking hole, making it easy for the locking bead to disengage from the locking hole, allowing the inner lock cylinder to rotate rapidly. When the outer lock cylinder is violently broken, the undamaged parts can be vibrated by using tools such as screwdrivers to displace the locking bead, causing it to disengage from the locking hole of the inner lock cylinder. This allows the unlocking fork to be rotated, enabling forced unlocking of the lock. To address the shortcomings of the aforementioned lock cylinder and enhance its anti-pry and anti-theft performance, this application proposes a more secure anti-pry lock cylinder. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a pry-proof lock core with high security performance and anti-violent damage function.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an anti-pry lock cylinder, including a lock shell, an opening groove in the middle of the lock shell, and a lock hole one and a lock hole two on both sides of the opening groove. An inner lock cylinder is rotatably disposed in the lock hole one, and an outer lock cylinder is rotatably disposed in the lock hole two. An unlocking fork and an unlocking handle are connected to the inner lock cylinder. An unlocking device is provided inside the inner lock cylinder to control the rotation or non-rotation of the inner lock cylinder relative to the lock shell. The unlocking device includes a locking hole one on the inner lock cylinder and a locking hole two on the lock shell corresponding to the position of the locking hole one. A stop bead is provided in the locking hole one, and a locking bead and a pressure spring for pushing the locking bead against the stop bead are provided in the locking hole two. The locking bead is cylindrical, and an annular limiting groove is provided on one end near the stop bead. The annular limiting groove divides the locking bead into an upper column and a lower circular block. The pressure spring is disposed on the upper column and drives the lower circular block to move to the opening of the locking hole one on the inner lock cylinder.

[0006] The present invention is further configured such that the transverse depth of the annular limiting groove is 0.45 mm and the longitudinal height is 2 mm.

[0007] The present invention is further configured such that the height of the longitudinal cross-section of the locking bead is 5.5 mm and the width is 2.8 mm.

[0008] By adopting the above technical solution, the ability to resist violent damage is enhanced. Even if the outer lock cylinder is violently damaged, and criminals attempt to displace the locking bead using a vibrating tool, the annular limiting groove structure can effectively hinder the axial movement of the locking bead, preventing it from easily disengaging from the inner lock cylinder, thereby preventing the illegal rotation of the inner lock cylinder, significantly improving the lock cylinder's resistance to violent opening, and greatly enhancing security performance. Attached Figure Description

[0009] Figure 1 This is an exploded view of the structure of this utility model;

[0010] Figure 2 This is a schematic diagram of the locking bead structure;

[0011] Figure 3 This is a cross-sectional view of the present invention;

[0012] Figure 4 for Figure 3 Enlarged view of point a in the middle;

[0013] Figure 5 This is a schematic diagram of a partial structure of the internal locking bladder;

[0014] Figure 6 This is a schematic diagram of a locking bead structure for background technology.

[0015] 1. Lock case; 10. Opening groove; 11. Lock hole one; 12. Lock hole two; 2. Inner lock cylinder; 3. Outer lock cylinder; 4. Unlocking fork; 5. Unlocking handle; 6. Unlocking device; 60. Locking hole one; 61. Locking hole two; 62. Abutment ball; 63. Locking ball; 64. Pressure spring; 65. Annular limiting groove; 66. Upper column; 67. Lower round block. Detailed Implementation

[0016] Reference Figures 1 to 6 The embodiments of this utility model will be further described below.

[0017] A pry-resistant lock cylinder includes a lock shell 1. An opening groove 10 is provided in the middle of the lock shell 1. A first lock hole 11 and a second lock hole 12 are respectively provided on both sides of the opening groove 10. An inner lock cylinder 2 is rotatably disposed within the first lock hole 11, and an outer lock cylinder 3 is rotatably disposed within the second lock hole 12. An unlocking fork 4 and an unlocking handle 5 are connected to the inner lock cylinder 2. An unlocking device 6 is provided within the inner lock cylinder 2 to control its rotation relative to the lock shell 1 or to prevent rotation. The unlocking device 6 includes a locking hole 60 opened on the inner lock cylinder 2, and a corresponding locking hole 60 on the lock shell 1. The second locking hole 61 corresponds to position 0. Locking hole 60 contains a stop bead 62, and locking hole 61 contains a locking bead 63 and a pressure spring 64 for pushing the locking bead 63 against the stop bead 62. The locking bead 63 is cylindrical, with an annular limiting groove 65 at its end near the stop bead 62. The annular limiting groove 65 divides the locking bead 63 into an upper column 66 and a lower circular block 67. The pressure spring 64 is positioned on top of the upper column 66, driving the lower circular block 67 to move to the opening of locking hole 60 on the inner lock cylinder 2. The annular limiting groove 65 has a lateral depth of 0.45 mm and a longitudinal height of 2 mm. The locking bead 63 has a longitudinal cross-sectional height of 5.5 mm and a width of 2.8 mm.

[0018] Working principle: Under normal conditions, the pressure spring 64 drives the lower circular block 67 on the locking bead 63 to the opening of the locking hole 60 on the inner lock cylinder 2, preventing the inner lock cylinder 2 from rotating relative to the lock shell 1. During normal unlocking, the inner lock cylinder 2 rotates, and the edge of the locking hole 60 can smoothly push the locking bead 63 back, thus unlocking smoothly. When the lock cylinder is violently broken, criminals can use other tools to vibrate the inner lock cylinder 2 to make the locking bead 63 back. Due to the annular limiting groove 65 on the locking bead 63, which is located at the opening of the locking hole 61 on the lock shell 1, even if other parts vibrate, the gap between the annular limiting groove 65 and the inner wall of the locking hole 61 can effectively prevent the axial displacement of the locking bead 63, temporarily limiting its movement. The unlocking fork 4 cannot rotate, thus preventing unlocking. This increases the difficulty of violently opening the lock cylinder, providing anti-theft and anti-pry protection.

[0019] 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. A pry-resistant lock cylinder, comprising a lock shell, an opening groove in the middle of the lock shell, and a first lock hole and a second lock hole on either side of the opening groove, wherein an inner lock cylinder is rotatably disposed in the first lock hole and an outer lock cylinder is rotatably disposed in the second lock hole, an unlocking fork and an unlocking handle are connected to the inner lock cylinder, and an unlocking device is provided therein for controlling the rotation or immobilization of the inner lock cylinder relative to the lock shell, the unlocking device comprising a first locking hole in the inner lock cylinder and a second locking hole in the lock shell corresponding to the position of the first locking hole, a stop bead in the first locking hole and a locking bead and a pressure spring for pushing the locking bead against the stop bead in the second locking hole, characterized in that: The locking bead is cylindrical, with an annular limiting groove at one end near the abutment bead. The annular limiting groove divides the locking bead into an upper cylindrical body and a lower circular block. The pressure spring is located on the upper cylindrical body, driving the lower circular block to move to the opening of the locking hole on the inner lock cylinder. The annular limiting groove is arranged circumferentially along the locking bead. Along the longitudinal cross-section of the locking bead, its height is 5mm-6mm and its width is 2.6mm-2.8mm. The transverse depth of the annular limiting groove is 0.8mm-1mm and its longitudinal height is 1.9-2.1mm.

2. The anti-pry lock cylinder according to claim 1, characterized in that: The annular limiting groove has a lateral depth of 0.45 mm and a longitudinal height of 2 mm.

3. The anti-pry lock cylinder according to claim 2, characterized in that: The locking bead has a longitudinal cross-sectional height of 5.5 mm and a width of 2.8 mm.

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