A combination lock

By constructing a closed detection circuit between the lock rope and the circuit board and utilizing the limiting cooperation between the plug and the lock rod, the problem of no alarm when the lock rope of the steel cable combination lock is cut is solved. Active identification and audible and visual warning when the lock rope is damaged are realized, thus improving the anti-theft performance.

CN122257632BActive Publication Date: 2026-07-21ZHEJIANG ZHONGLI GRP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZHEJIANG ZHONGLI GRP
Filing Date
2026-05-26
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing steel cable combination locks lack alarm functions and cannot sound an alarm when the lock rope is maliciously cut, resulting in unsatisfactory anti-theft performance.

Method used

A closed detection circuit is constructed between the locking rope and the circuit board. Electrical connection is achieved by the limiting cooperation between the plug and the locking rod. When the locking rope is cut, the circuit board immediately triggers an alarm signal. The stable conduction and disconnection of the circuit are ensured by the mechanical elastic linkage structure, and an audible and visual warning is issued in conjunction with a buzzer.

Benefits of technology

It achieves active identification and audible and visual warning when the lock rope is damaged, significantly improving the security performance of the combination lock against violent damage and theft. It also has a compact structure, high operational stability, and avoids false alarms.

✦ Generated by Eureka AI based on patent content.

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    Figure CN122257632B_ABST
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Abstract

The present application relates to a kind of password locks, including lock body, lock rope and the password wheel assembly and winding piece being arranged in lock body, the first end of the lock rope is fixed on winding piece, the second end of lock rope is provided with plug, the lock body is provided with the insertion hole for plug insertion, the lock rod locking state, lock rod is limit cooperation with plug, unlocking state, lock rod is axially slipped relative to lock body, plug can be separated from insertion hole, circuit board is further provided in the lock body, the lock rope has conductivity, the first end of the lock rope is electrically connected with circuit board, when plug is limit cooperation with lock rod, plug is electrically connected with circuit board, and closed detection loop is formed between the both ends of plug and circuit board, when circuit board can send alarm signal when forcibly cutting closed detection loop in the locking state of lock rod, the above technical scheme is used, the present application provides a kind of password locks, with alarm function, when lock rope is maliciously cut, circuit is interrupted, password lock sends alarm signal, improve the performance of theft prevention.
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Citation Information

Patent Citations

  • Portable sound-light alarm coded lock

    CN209653623U

  • Cylinder lock device

    JP2006070552A