Ventilation – Fire damper
Patent
1997-07-07
2000-02-08
Joyce, Harold
Ventilation
Fire damper
F24F 11053
Patent
active
060222719
ABSTRACT:
A fire responsive, closing air vent includes a main frame enclosing an air flow passageway with a hingeable cover connected to the main frame which can open and close. The frame has a mechanism for biasing the cover towards the closed position and a preformed mass of material, e.g. meltable wax positioned at least in part between the frame and the cover to hold the cover in the open position. The material is at least partially moveable (e.g., shrinkable or meltable) in response to an increase in ambient temperature in excess of 140.degree. F. so as to cease from holding the cover in an open position and permitting the weight to close the cover. In one embodiment, the vent is made up of a flat plate and a subframe for insertion into a building structure and is positioned at right angles to the flat plate. In another embodiment, the main frame of the closing air vent has a plurality of air passageways and the cover is capable of covering all of the air passageways.
REFERENCES:
patent: 2718187 (1955-09-01), Frisby
patent: 2755728 (1956-07-01), Frisby
patent: 3076469 (1963-02-01), Averill
patent: 3687055 (1972-08-01), Dean, Jr. et al.
patent: 3899156 (1975-08-01), McCabe
patent: 4562853 (1986-01-01), Tschirky et al.
patent: 4667581 (1987-05-01), Hovland
patent: 5797321 (1998-08-01), Shibata
Glynn, Esq. Kenneth P.
Joyce Harold
LandOfFree
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