Exhaust fan and anti-backdraft shutter assembly

Details Exhaust fan and anti-backdraft shutter assembly Exhaust fan and anti-backdraft shutter assembly

1981-04-16

1983-05-31

Tapolcai, William E.

Spring devices

Vehicle

Lever and nontorsion spring

98 43R, 267155, 415146, F24F 1310

Patent

active

043855520

ABSTRACT:
Two anti-backdraft shutters are each supported in an exhaust fan assembly casing on a set of upper and lower parallel support arms. Outer ends of each set of these arms are pivotably mounted in the casing in closely adjacent relation to the other set on substantially vertical axes in closely adjacent relation to an exhaust fan motor and between the motor and an intake port defining the intake end of the casing. The shutters can move between an open position in almost parallel relation to each other with the fan-motor in between under the action of air being exhausted, and a closed position where the shutters close off the entire intake port. A coil spring urges the shutters to move toward closed condition.

REFERENCES:
patent: 2541665 (1951-02-01), Prudhon
patent: 2605097 (1952-07-01), Masoner
patent: 2750185 (1956-06-01), Moore
patent: 2823413 (1958-02-01), Stewart
patent: 3965926 (1976-06-01), Buckner
patent: 4005732 (1977-02-01), Buckner
patent: 4257444 (1981-03-01), Ogle, Jr. et al.
patent: 4257451 (1981-03-01), Paton

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