Door lock having security device

Details Door lock having security device Door lock having security device

1989-11-20

1991-04-02

Nicholson, Eric K.

Closure fasteners

Bolts

Sliding

2923363, 292359, F05C 108

Patent

active

050042785

ABSTRACT:
An improvement of the door lock which is extensively used in all kinds of doors is disclosed which is characterized in that a security device is added to the existing door lock without modifying the constitution and the operating principle of the existing door lock, so that, once the security device is activated from the inside of the room, the door lock can never be opened by even the corresponding key and other means from the outside, thereby protecting the persons staying inside the room from the attempt of an unpermitted intruder.

REFERENCES:
patent: 2720408 (1955-10-01), Krupicka
patent: 2847242 (1958-08-01), Schlage
patent: 2917337 (1959-12-01), Schlage
patent: 3022102 (1962-02-01), Russell et al.
patent: 4470279 (1984-09-01), Neary et al.
patent: 4920773 (1990-05-01), Surko, Jr.

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