Stoves and furnaces – Hot-air furnaces – Compressed air
Patent
1990-11-21
1991-10-15
Dority, Carroll B.
Stoves and furnaces
Hot-air furnaces
Compressed air
126116A, 126112, 126285B, 236 1G, F24H 302
Patent
active
050565001
ABSTRACT:
A furnace comprises a housing, a fan or blower for moving air through housing, a burner in the housing, fuel supply means operatively connected to the burner, a heat exchanger in the housing a combustion chamber, the burner cooperating with said combustion chamber, an enclosure enclosing the heat exchanger and burner, said enclosure having an opening therein, and a damper operable to control the flow of air through said opening to the heat exchanger. The damper comprises a plate member pivotally mounted in the housing for opening and closing said opening. Preferably a drive motor opens the plate member and a spring biases the plate member closed. The damper is closed when the burner is off and is open when the burner is on. There is a circuit associated with the fuel supply means which is responsive to a predetermined open position of the plate member for permitting the flow of fuel through the fuel supply means when the plate member is open to said predetermined open position. A pilot hole is provided in the plate member for supplying limited air to said burner to maintain combustion for a pilot flame.
REFERENCES:
patent: 2780146 (1956-06-01), Schoelles
patent: 3092320 (1963-06-01), Powers
patent: 3820526 (1974-06-01), Van Vliet
patent: 4155699 (1979-05-01), Hansen
patent: 4274392 (1981-06-01), Meyers
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