Rear lock assembly for preventing unlocking from door viewer

Abstract

A rear lock assembly for preventing unlocking from a door viewer comprises a rear shell with a front opening, a handle, a handle head, a torsion spring, a reversing lock cylinder and a limiting plate,and further comprises a round button, a push rod, a square rotating connecting rod and a pressure spring, wherein the push rod comprises a driving head portion, a guiding rod portion and a threaded connection portion; one end of the pressure spring is inserted into a square driving hole; the square rotating connecting rod is arranged in a square guiding cavity; the other end of the pressure spring extends into a round spring cavity of the square rotating connecting rod; the driving head portion is arranged in a head cavity; the guiding rod portion is in sliding fit with a guiding hole; the threaded connecting portion is in threaded fit with a screw hole of the button; and the button is in sliding fit with a button sliding hole; and a driving protrusion is matched with a driven locking portion. When a user unlocks the rear lock assembly from an indoor environment, the button and a square rotating connecting rod are used for connecting the reversing lock cylinder with the handle head together at first, and a hand-held portion is pressed down to unlock the rear lock assembly; a rod-shaped object extending into the door viewer can only press the hand-held portion without pressing thebutton and the hand-held portion together, so that a purpose of preventing unlocking from the door viewer is achieved, and theft prevention is implemented.

Description

technical field [0001] The invention relates to a door lock, in particular to a door lock rear lock assembly. Background technique [0002] In the current prior art, a cat-eye-proof rear lock assembly includes a rear shell with a front opening, a handle, a handle head, a torsion spring, a reversing lock cylinder and a limit plate. The panel of the rear shell is provided with a rear opening. The pivot cavity and the two torsion spring seats, the end plate of the pivot cavity is provided with a shaft hole; the handle includes a hand-held part and a connection seat, the connection seat is provided with a polygonal connection hole, the handle head includes a disc body, and A shaft body part connected with the center of the disc body, a polygonal connection part connected with the shaft body part, and a lock cylinder connecting hole extending through the disc body into the shaft body part; A seat plate part at one end of the shape connecting part and a circular shaft seat part w...

AI Technical Summary

Problems solved by technology

Lift the handle to lock the door and press down to unlock it; there is a problem: other people can pass through the peephole on the door body, extend into the rod and press down to unlock it, which is not anti-theft

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