Anti-theft lock

Abstract

The invention discloses an anti-theft lock. The anti-theft lock comprises a lock cylinder shell, a lock cylinder, a lock sheet assembly and a marble assembly; the lock cylinder is divided into a lock cylinder front section and a lock cylinder back section, a first cavity with a square cross section is arranged inside the lock cylinder front section, a second cavity with a square cross section is arranged inside the lock cylinder back section, one end of the second cavity is closed, and the other end of the second cavity is communicated with the first cavity, and the width of the second cavity is larger than the width of the first cavity; the closed end of the second cavity is provided with a ring-shaped protruding column protruding towards the first cavity, the cross section of the protruding column is in a ring shape; and the lock sheet assembly is located in the lock cylinder front section, and the marble assembly is located in the lock cylinder back section. According to the anti-theft lock, the lock sheet assembly and the marble assembly are arranged on the lock cylinder front section and the lock cylinder back section of the anti-theft lock, the protruding column is further designed in the cavity of the back section and can prevent an unlocking tool from completely extending into the cavity of the back section, the marble assembly nearby the protruding column can be prevented from being pulled by the unlocking tool, and therefore the so-called technological unlocking can be effectively avoided.

Description

technical field [0001] The invention relates to the field of locks, in particular to an anti-theft lock with strong anti-theft performance. Background technique [0002] The anti-theft door lock cylinders used on the market are basically divided into three levels, namely A level, B level, super B level (also known as C level). According to the "National Mechanical Lock Standard", there are two grades of anti-theft door lock cylinders, A and B, and the Super B grade is an enhanced version of B grade developed by entrepreneurs. [0003] A-level locks: At present, the A-level anti-theft lock keys on the market mainly have a word key and a cross key. The internal structure of the A-level lock cylinder is very simple, limited to the change of the marbles, and the grooves of the pins are few and shallow. The anti-technical opening time is within 1 minute, and the mutual opening rate is extremely high. The marble structure is a single row of marbles or a cross lock. [0004] B-...

AI Technical Summary

Problems solved by technology

The marble structure is double-row blades and V-shaped side columns to lock; if the lock cylinder is opened with a strong twist tool, the inside of the lock cylinder will be damaged, self-explosive and locked, resulting in failure to open

[0006] However, regardless of the A-level lock, B-level lock or the C-level lock with the highest anti-theft performance, since the unlocking tool may be completely inserted into the key slot of the lock cylinder, there is a possibility of being opened by technology, it is only a matter of time.

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