Device for assisting the opening of a door

Details Device for assisting the opening of a door Device for assisting the opening of a door

1974-08-08

1976-03-30

Downey, Kenneth

Movable or removable closures

Registerable opening in facially opposed closure and barrier

49 72, 49171, 98 87, E06B 702

Patent

active

039465233

ABSTRACT:
Apparatus for assisting the opening of a door when the door is subjected to added air pressure tending to hold the door closed, the door being provided with openings therethrough and including means for closing the openings but which will operate to remove the closure upon operation of means for unlatching the door.

REFERENCES:
patent: 1218684 (1917-03-01), Mitchell
patent: 1939312 (1933-12-01), Murray
patent: 1965725 (1934-07-01), Smith et al.
patent: 3073525 (1963-01-01), Cislo
patent: 3337990 (1967-08-01), Iwata

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