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US 4,080,978 AGranted
Smoke, fire and air control damper
OwnerFrancis J. McCabeinventor
Life of this patent
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Abstract
A rotating blade, smoke, fire and air control damper with spring closures attached on both inside and outside surfaces of the blades is disclosed. The spring closures cooperate with a bimetallic heat sensing device to trigger the closing of the blades at a predetermined temperature.
Claims14
A fire damper comprising:
- (a) a frame;
- (b) a plurality of blades associated with said frame;
- (c) rotation means for allowing selective rotational displacement of said blades between closed and open positions with respect to said frame;
- (d) linkage means for articulating the position of said plurality of blades with respect to each other and with respect to the frame during the rotation thereof;
- and
- (e) at least two biasing means for simulataneously forcing said blades from said open toward said closed position, said biasing means being located on opposite sides of said blades in said closed position.
3 more elements
Dependencies are inferred from the claim text.