Movable or removable closures – Sequential closures for passageway
Patent
1981-04-15
1983-03-08
Downey, Kenneth
Movable or removable closures
Sequential closures for passageway
49 32, 49141, E06B 700
Patent
active
043757359
ABSTRACT:
An air lock has a chamber and a pair of doors in respective walls of the chamber. Operators associated with the doors include closers normally biasing the doors to closed positions and fluid powered openers associated with the closers capable of overriding the bias of the closers. A control system, operation of which may be initiated by initial opening displacement of one of the doors or (in one embodiment of the invention) by manually operable remote switch means, provides for opening of one of the doors and latching of the other to prevent simultaneous opening of both doors. The latch means for the doors may be overriden by direct displacement of the doors for safety purposes. The control system also triggers air handling apparatus associated with the chamber.
REFERENCES:
patent: 2190653 (1940-02-01), Dunn
patent: 3478468 (1969-11-01), Martin
patent: 3576854 (1951-11-01), Peremi et al.
patent: 4222147 (1980-09-01), Burnett, Jr.
Dorma Door Controls Inc.
Downey Kenneth
Podwil Robert C.
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