Mechanical coded lock

Abstract

The invention discloses a mechanical coded lock. The mechanical coded lock comprises a lock case and a lock cover matched with the lock case; wherein the lock case is internally provided with a locking dog, the locking dog is matched with the lock cylinder by a transmission connecting rod, the transmission connecting rod is provided with a torsion spring which can cause the transmission connecting rod to be tightly contacted with the lock cylinder; the mechanical coded lock also comprises a lock-up structure, the lock-up structure comprises a screw fixed with the lock case, the screw is sheathed with a spring and a limit piece, the limit piece causes the spring to be in compression state under the coordination of the lock cover, and the locking dog is provided with a limit slot matched with the limit piece. The lock-up structure is arranged, when the mechanical coded lock is in locked state, the lock cylinder and the lock cover are destroyed and the limit piece moves to the limit sloton the locking dog along the screw under the action of the spring, and the locking dog can not contract under the action of the limit slot, thus the mechanical coded lock can not be open even the lock cylinder of the coded lock is destroyed and the safety of safety box or safe deposit box applying the coded lock is improved.

Description

technical field The invention relates to the field of combination locks, in particular to a mechanical combination lock for safes or safes. Background technique Combination locks mainly include two types, one is an electronic combination lock, which controls the combination lock to be opened by electronic technical means; the other is a mechanical combination lock, which is set and opened by turning the angle of the lock cylinder. Since the electronic combination lock can easily crack the password by decoding, the mechanical combination lock is opened or closed through the structural cooperation between the machines, and the password amount can be set differently according to the needs, so it is difficult to crack. Based on the disadvantages of the above-mentioned electronic coded lock and the advantages of mechanical codes, mechanical codes have been widely used in banks to deposit cash and other valuables. Existing mechanical combination lock adopts starter wheel to driv...

AI Technical Summary

Problems solved by technology

For example U.S. Patent No. is the patent of 4532785, although the coded lock of this structure is difficult to crack by normal means, if after de

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