Automatic furnace vent damper control

Details Automatic furnace vent damper control Automatic furnace vent damper control

1980-01-21

1981-10-13

Yeung, James C.

Stoves and furnaces

Dampers

Distance operating devices

126290, 236 1G, 236 93A, F23L 300

Patent

active

042942268

ABSTRACT:
A thermally actuated control system for the chimney flue or vent damper of a hot air furnace employs a fluid reservoir supported in the vent between the damper and the furnace so as to experience the furnace temperature, containing fluid that has a liquid state when the furnace is not in operation and a gaseous state at the higher temperature resulting when the furnace goes into operation. A spring biased piston movable within the reservoir is connected to the damper shaft by a barrel cam supported exteriorly of the vent, which converts the linear motion of the actuator into rotation of the damper shaft. The change in temperature when the furnace goes on or off produces a resultant change in the volume of the fluid within the reservoir, moving the linear actuator between its two positions and rotating the cam and the damper so that the damper is in an open position when the furnace is on and a closed position when the furnace is off.

REFERENCES:
patent: 1784608 (1930-12-01), Meyers
patent: 2509733 (1950-05-01), Gillen
patent: 2712731 (1955-07-01), Dills
patent: 4071190 (1978-01-01), Ford, Jr.

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