Mechanical door lock

Abstract

The invention discloses a mechanical door lock. The mechanical door lock comprises a lock case, a lock tongue mechanism, a lock tongue transmission mechanism, a lock head mechanism, a handle mechanism, a trigger structure and a clutch transmission mechanism. The lock head mechanism comprises a lock cylinder and a first shifting piece which can rotate along with the lock cylinder. The handle mechanism comprises an inner handle shaft, an outer handle shaft and a clutch structure. The clutch structure is in a separated state when no external force acts on the clutch structure. The clutch structure is in a combined state when external force acts on the clutch structure, so that the inner handle shaft and the outer handle shaft are combined into a whole. A second shifting piece is arranged on the inner shaft handle, and the second shifting piece can make a lock tongue retract into the lock case by shifting the lock tongue transmission mechanism. The trigger structure moves in the forward direction when the first shifting piece rotates forwards so as to push the clutch transmission mechanism to make the clutch structure be in the combined state, and the trigger structure is driven to restore when the second shifting piece rotates in the unlocking direction. According to the mechanical door lock, the situation that the lock cylinder is damaged due to the fact that the large unlocking tension is borne by the lock cylinder is avoided, the outer handle shaft or the portion, making contact with a lock body, of the outer handle shaft is protected against violent twisting damage, and the safety performance is better.

Description

technical field [0001] The invention relates to the technical field of locks, in particular to a mechanical door lock. Background technique [0002] Door locks play an important role in ensuring personal and property safety. According to different unlocking methods, they can usually be divided into electronic door locks and mechanical door locks. Wherein, the mechanical door lock realizes unlocking or locking by a key matched with the lock. [0003] When locking or unlocking a traditional mechanical door lock, it is usually necessary to insert a key into the lock hole of the lock cylinder, and then rotate the key to drive the lock cylinder to rotate, and then drive the lock tongue to extend or retract. This kind of mechanical door lock directly drives the extension and retraction of the lock tongue through the rotational torque of the lock cylinder, so the lock cylinder will bear a relatively large torque, which will make it more laborious for the user to unlock on the one ...

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the handle or the joint between the handle and the lock body of the mechanical door lock in the prior art is easily twisted violently, resulting in forced unlocking, thereby providing a handle or the handle and the lock body A mechanical door lock that is not easily damaged by violence

[0006] Another technical problem to be solved by the present invention is to overcome the defect in the prior art that the mechanical door lock unlocked by rotating the handle is poor in safety, thereby providing a mechanical door lock with good safety

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