Anti-theft door lock with inclined tongue

Abstract

The invention discloses an anti-theft door lock with an inclined tongue. The anti-theft door lock comprises a face plate, a shell, a buckle plate, a key, the inclined tongue, an inclined tongue carriage, a twisting device, a stroke and axial limiting device and a safety locking device. The twisting device comprises a rotary knob spring, a rotary knob arranged on the periphery of the rotary knob spring in a sleeving manner, a lock cylinder arranged in the center of the rotary knob spring and a transmission plate, and the rotary knob spring and the inclined tongue carriage are connected through the transmission plate. The stroke and axial limiting device comprises a stroke limiting groove, a limiting block and a limiting torsional spring, wherein the stroke limiting groove is formed in one side of the inclined tongue carriage, one end of the limiting block is located in the stroke limiting groove, and the other end of the limiting block is attached to the limiting torsional spring. The safety protection device comprises a sliding block fixedly connected with the inclined tongue carriage and a stirring block arranged at the bottom of the sliding block. The other end of the sliding block is connected with the lock cylinder. After the structure is adopted, the radial movement stroke of the inclined tongue can be limited, the inclined tongue is pressed and locked in the axial direction, back locking can be achieved outdoors without the key, and use is convenient.

Description

technical field [0001] The invention relates to a hardware lockset, in particular to an oblique bolt 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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