Valves and valve actuation – Heat or buoyancy motor actuated
Patent
1987-09-24
1989-04-04
Walton, George L.
Valves and valve actuation
Heat or buoyancy motor actuated
16485, 49 2, 98 1, 251 75, 256 492, 256 493, F16K 3170, F24F 700
Patent
active
048179124
ABSTRACT:
A damper operator for use with a damper having a frame and a damper blade pivotally associated with the frame, which damper operator comprises a bi-metallic element provided with a heating pad which may be remotely activated to control the damper. The bi-metallic element is linked to the blade by a linkage which includes an over center spring which applies force in both the fully opened and fully closed blade position. The bi-metallic element and over center spring arrangement acts to snap the damper blade into position thereby providing greatly reduced response times for a bi-metallic actuated damper. The damper blade operator may also include a knee action locking arrangement to maintain the damper blade in a selected position, particularly fully opened or fully closed, when the locking members assume an over center, substantially longitudinal alignment. The bi-metallic operator may include a mechanical linkage or stop to allow blade adjustment to regulate air flow through the damper.
REFERENCES:
patent: 1919625 (1933-07-01), Ewald
patent: 3378199 (1968-04-01), Snell
patent: 3889314 (1975-06-01), McCabe
patent: 3967779 (1976-07-01), Logsdon
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patent: 4074388 (1978-02-01), McCabe
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patent: 4472999 (1984-09-01), McCabe
patent: 4559867 (1985-12-01), Van Becelaere et al.
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