Stoves and furnaces – Dampers – Stovepipe
Patent
1986-12-05
1987-09-08
Yeung, James C.
Stoves and furnaces
Dampers
Stovepipe
126292, 126285R, 251297, 98 411, F23L 300
Patent
active
046916890
ABSTRACT:
This invention provides an adjustable damper having a tubular duct section defining first and second diametrically opposed openings and first and second sets of detents formed radially from the material of the duct about the respective openings to define a plurality of damper settings. The first detent set is offset angularly relative to the second detent set and a valve element is provided having a circular central portion proportioned to fit within the duct section. Diametrically opposed first and second shoulders project from the periphery of the disc and aligned first and second stub axles are formed from the material of the disc and depend from the respective first and second shoulders. These shoulders are engaged with the respective first and second sets of detents such that in any one selected angular position of the valve element, the element is located by engagement of one of the shoulders in one of the detents of the detent sets. Means is provided attached to one of the stub axles to permit manual operation to change the angular position of the element in the duct section for positioning one of the shoulders in another of the detents of the detent sets whereby the flow of air through the duct can be controlled in stages by moving the element between fully closed and fully open positions.
REFERENCES:
patent: 881099 (1908-03-01), Fraser
patent: 1023866 (1912-04-01), Mueller, Jr.
patent: 1125416 (1915-01-01), Watson
patent: 1146807 (1915-07-01), Massing
patent: 1325237 (1919-12-01), Filbey
patent: 1604219 (1926-10-01), Coventry
patent: 3007673 (1961-11-01), Paxton et al.
patent: 3073564 (1963-01-01), Alter
Shepherd Charles G.
Travale Samuel
B. D. Wait Co. Limited
Yeung James C.
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