Safety chain lock for doors

Details Safety chain lock for doors Safety chain lock for doors

1975-07-25

1977-06-07

Gilliam, Paul R.

Closure fasteners

Extension link

Chain

70 93, E05C 1736

Patent

active

040279081

ABSTRACT:
A chain lock for doors is greatly reinforced by the placement of a first chain end anchor behind an angle retainer which embraces a square corner of the adjacent door frame and is further secured by a serrated clamping plate in a plane perpendicular to the first chain end anchor. The opposite chain end anchor is received in a slot of a retainer plate which similarly embraces a corner of the swinging door and is further held securely by an extension which is locked to an adjacent interior portion of a door lock cylinder housing assembly.

REFERENCES:
patent: 1924627 (1933-08-01), Segal
patent: 2724257 (1955-11-01), Segal
patent: 2726112 (1955-12-01), Conhagen
patent: 3660997 (1972-05-01), Michnoff

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