Chain door lock

Details Chain door lock Chain door lock

1985-03-15

1986-11-18

Moore, Richard E.

Closure fasteners

Extension link

Chain

E05C 1736

Patent

active

046231803

ABSTRACT:
A chain-type door lock comprising a wall bracket, door bracket and a connecting linkage is disclosed. The wall bracket comprises an L-shaped mounting plate which can be secured to the side face of a door jamb by screws and a cover plate which is mountable over the mounting plate to block access to the screws. The connecting linkage is preferably a chain which is attached at one end to one of the door or wall brackets and which has a key at its other end for engaging a slot in the other of the door or wall brackets. The slot may be vertical or horizontal.

REFERENCES:
patent: 1623050 (1927-04-01), Frantz
patent: 2484024 (1949-10-01), Garberding
patent: 3339963 (1967-09-01), Chambers
patent: 3467428 (1969-09-01), Constable
patent: 3521922 (1970-07-01), Bowling
patent: 3809418 (1974-05-01), Canfield
patent: 3963269 (1976-06-01), Rosenberg
patent: 4073523 (1978-02-01), Long
patent: 4106800 (1978-08-01), Nakanishi

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