A square tongue anti-theft door lock

Abstract

The invention discloses a square tongue anti-theft door lock. The square tongue has a built-in square tongue strong magnet; the button box is provided with a lock hole, and the lock hole is provided with a button box magnet. The twisting device includes a knob spring, a knob lock cylinder and a transmission plate, and the transmission plate connects the knob spring with the square tongue carriage. The travel and axial limit device includes a travel limit groove, a limit block and a limit torsion spring. The travel limit groove is arranged on one side of the square tongue carriage, and one end of the limit block is located in the travel limit groove. The other end of the block is fitted with the limit torsion spring. The safety locking device includes a sliding block fixedly connected with the square tongue drag plate and a toggle block arranged at the bottom of the sliding block; the other end of the sliding block is connected with the lock cylinder. After the above structure is adopted, the radial movement stroke of the counter tongue can be limited, the square tongue can be pressed and locked in the axial direction, and the lock can be reversed outdoors without a key, which is convenient to use.

Description

technical field [0001] The invention relates to a hardware lockset, in particular to a square tongue anti-theft door lock. Background technique [0002] A door lock is a device installed on the door to lock the door to prevent others from opening it easily. There are many types of door locks, including mechanical and electronic. According to different usage occasions and usage requirements, the types are different One, but the vast majority of door locks should have a common feature, that is, anti-theft, so people make a big fuss about door locks on anti-theft, and various anti-theft door locks emerge in endlessly, and among many anti-theft door locks, The most common type of anti-theft door lock is mechanical. [0003] Mechanical anti-theft door locks are mainly manual unlocking methods. They are reasonably priced, have high mechanical strength, and are more convenient to install and maintain. Therefore, they have a large market share. There is a lock tongue inside, a twi...

AI Technical Summary

Problems solved by technology

[0005] 1. The radial movement stroke of the lock tongue is controlled by the lock tongue spring and the twisting device. The lock tongue is easy to shrink into the lock housing, causing the lock tongue to be stuck.

[0006] 2. The lock tongue cannot be limited and locked in the axial direction, and some thieves exert an axial force on the door lock when they pry the door. If the anti-theft performance of the anti-theft door is greatly reduced

[0007] 3. When anti-locking outdoors, you need to use a key to lock it, which is inconvenient to use

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