JP2001032581A - Shaft fixed type double locks for door lock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a cylinder from being rotated from the outside by forming a groove in a shaft on an indoor side, forming a hole having a shape of a combination of a circle and a square in a L-shaped plate central portion, and sliding the L-shaped plate along the groove, to thereby prevent the shaft from being rotated. SOLUTION: An L-shaped plate 3 has a hole 4 formed therein at a central portion thereof, which hole has a shape of a combination of a circle and a square. A shaft 2 of a lock has a groove 1 at a base of the shaft in a manner being arranged on an upper side and a lower side of the base when locked. The shaft 2 of the lock is inserted into the hole 4 of the L-shaped plate 3, and conformed to the groove 1 of the shaft 2. When the lock is used, a knob of the lock is rotated from the inside of the door to lock the door normally, and the L-shaped plate 3 is slid to fix the shaft 2 of the lock. Thus, the lock cannot be opened from the outside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double lock for a door lock which cannot be easily opened.

[0002]

2. Description of the Related Art Conventionally, with a door lock alone, it is often easy to open a wire-like object from the outside into a hole in a cylinder, so it is not safe to stay in your own home, and it is not safe to stay at your door. Had been locked.

[0003]

[Problems to be solved by the invention]

I. It had been opened with a wire from the keyhole. B. The chain was double-locked from the indoor side, but it could be easily opened. C. There are times when there is no easy place to install a lock on the indoor side even if you want to lock it separately. The present invention has been made to solve the above drawbacks.

[0004]

A shaft (2) on the indoor side is provided with a groove (1). Then, a hole (4) having a round shape and a square shape is provided at the center of the L-shaped plate (3). The present invention is a shaft lock type double lock for a door lock having the above configuration.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS When using the present invention, when a normal lock is applied indoors, a groove (1) at the base of a shaft (2) is formed up and down, and an L-shaped plate (3) is slid. . Therefore, the shaft cannot be rotated, the cylinder cannot be rotated from the outside, and the lock cannot be opened.

[0006]

Embodiments of the present invention will be described below. (A) A hole (4) having a round shape and a square shape is provided in the center of the L-shaped plate (3). (B) Grooves (1) are provided at the base of the shaft (2) of the lock when it is locked. (C) Pass the lock shaft (2) through the hole (4) of the L-shaped plate (3) and fit it into the groove (1) of the shaft (2). The present invention has the above configuration. When using the present invention, turn the lock knob (7) from inside the door,
A normal lock is applied, and the L-shaped plate (3) is slid to fix the lock shaft (2). As a result, from outside the door,
You cannot open the lock.

[0007]

By using the present invention, even a person who has the technology to open a lock using the hole of a cylinder from the outside of a door can not open it and can stay in the house with peace of mind. it can.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of the present invention.

FIG. 2 is a perspective view of the present invention.

FIG. 3 is a perspective view in which a part of the present invention is broken.

[Explanation of symbols]

 Reference Signs List 1 groove 2 axis 3 L-shaped plate 4 hole 5 cylinder 6 knob body 7 knob

Claims (1)

[Claims] A double lock for a door lock having a groove (1) formed in a shaft (2) and a hole (5) in the center of an L-shaped plate (3).