An automatic anti-theft door lock

Abstract

The invention discloses an automatic safe-guard chain door lock. The automatic safe-guard chain door lock comprises a spring bolt component, a locking device and a rotating device, wherein the rotating device comprises a rotating piece, a first connecting piece and a biasing piece; the rotating piece is rotatably arranged inside a lock case around the axis; the first connecting piece is used for connecting the rotating piece with a spring bolt mounting plate for mounting the spring bolt component; with the matching of a first steering structure, the rotating piece rotates to bring back the spring bolt mounting plate or push the spring bolt mounting plate out of the lock case through the first connecting piece; the biasing piece is used for applying a biasing force rotating forwards the locking direction to the rotating piece; the rotating piece can be sleeved on a handle shaft in a rotating manner along with the handle shaft or can be sleeved on a tapered end in the rotating manner along with the tapered end; an intermediate transmission structure capable of driving the opposite side to rotate is further arranged between the handle shaft and the lock. According to the automatic safe-guard chain door lock, the handle shaft can be used for directly driving the rotating piece so as to bring back the spring bolt mounting plate or push the spring bolt mounting plate out of the lock case through the first connecting piece, and the tapered end can be used for driving the rotating piece to realize the process through the intermediate transmission structure; during the process, intermediate components are few, assembling errors are unlikely to occur, and the automatic safe-guard chain door lock is simple and compact in overall structure, safe and reliable.

Description

technical field [0001] The invention relates to a mechanical automatic lock, in particular to an automatic anti-theft door lock. Background technique [0002] The anti-theft door lock is used to realize the locking between the door and the door frame. The door lock is mainly used to lock the door by inserting the bolt into the hole of the door frame. The head drives the lock bolt to move through the transmission mechanism. Considering the anti-theft performance of anti-theft door locks, most anti-theft door locks are equipped with main lock bolts, sliding bolts and oblique bolts. To make the lock cylinder drive these lock bolts to move, a transmission mechanism needs to be set in the lock body. In the existing anti-theft door lock, the transmission structure is relatively complicated, which makes the overall weight of the anti-theft door lock relatively large, the production cost is high, and the failure rate is relatively high in the actual use process. [0003] Chinese p...

AI Technical Summary

Problems solved by technology

[0005] For this reason, the technical problem to be solved by the present invention is that the simple anti-theft door lock in the prior art has complex structure, poor stability, and easy failure problems, and then provides a simple and compact structure, safe and reliable automatic anti-theft door lock

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