Door security lock

Details Door security lock Door security lock

1993-10-20

1998-06-30

Dino, Suzanne

Closure fasteners

Bolts

Swinging

292210, 292292, 292297, E05C 304

Patent

active

057722650

ABSTRACT:
A drop bolt system provides a low profile, simplified arrangement of a central metal plate, a metal doorjamb restraint and a plate latch. This system prevents overriding the door security system from a position exterior to the protected door.

REFERENCES:
patent: 966349 (1910-08-01), McCullah
patent: 1210826 (1917-01-01), Minor
patent: 1288988 (1918-12-01), Reed
patent: 1312931 (1919-08-01), Tenny
patent: 1549182 (1925-08-01), Church
patent: 1633645 (1927-06-01), Molberg
patent: 1650146 (1927-11-01), Moore
patent: 1706995 (1929-03-01), Bovey
patent: 2644708 (1953-07-01), Poole
patent: 4871203 (1989-10-01), Rogers

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