Chain latch for door

Details Chain latch for door Chain latch for door

1977-01-10

1978-08-15

Moore, Richard E.

Closure fasteners

Extension link

Chain

292238, E05C 1736

Patent

active

041068009

ABSTRACT:
A chain latch for door comprising a chain which is set hanging between a door and a door-frame and limits the opening of the door for preventing wrongdoers from intrusion. One end of the chain is fixed to the door-frame, while to the other end of the chain is joined a locking member having an elongated slot. A retainer member carrying a hook which is hung with the locking member is fixed to the door, the hook having a neck portion engaging with the elongated slot of the locking member and a head portion formed into T-shape at the end of the neck portion for preventing the elongated slot of the locking member from getting out of the neck portion. When the door is in its closed position, a person on the inside can pass the elongated slot over the head portion for engaging the locking member with the neck portion of the hook or putting the former out of the latter. When the door is in an opened position even slightly, the elongated slot and the head portion of the hook cross each other so that nobody can remove the locking member away from the neck portion of the hook.

REFERENCES:
patent: 878294 (1908-02-01), Kleidmann
patent: 963427 (1910-07-01), Erkens
patent: 1722736 (1929-07-01), Derbyshire
patent: 2036679 (1936-04-01), Bourn
patent: 2805093 (1957-09-01), Van Den Thoorn
patent: 2985476 (1961-05-01), Tiffany

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