US 3,976,245 A · Automatic, temperature responsive damper assembly

Abstract

An automatic temperature responsive damper assembly for use primarily with turbine-type attic ventilators is disclosed. A temperature sensitive power element capable of generating a force in the order of fifty pounds per square inch is positioned beneath the vane or vanes of the damper. The preferred power element is a sealed bellows unit containing the appropriate heat-expansible fluid. Expansion of the bellows with increased heat actuates a pivoted lever to cause opening and closing of the damper over a predetermined range of temperatures. Communication of the lever movement to movement of the damper vane or vanes is accomplished by providing the free end of the pivoted lever with an upwardly extending arm having a vane engaging camming surface. By shaping the camming surfaces in a sinusoidal fashion, a rapid initial opening of the damper is provided as well as protection against damage to the damper assembly should the maximum preset temperature be exceeded.

Claims6

Dependent claims

An automatic temperature responsive damper assembly for use within the conduit of a ventilating system designed to exhaust the air in a confined space to the atmosphere whereby said conduit may be opened in order to minimize excess heat build up in said confined space and closed when it is desired to prevent heat loss from said confined space, said assembly comprising:

at least one vane carried within said conduit and movable between a generally closed position and a generally open position;
a temperature responsive drive assembly mounted to detect temperature changes in said conduit and adapted to actuate in response to temperature changes within a predetermined range;
a lever arm positioned in said conduit and operatively connected between said drive assembly and said at least one vane to move said at least one vane in response to actuation of said drive assembly;
said lever arm being provided at its distal end with a vane engageable finger having a camming surface for each vane, said camming surface adapted so as to move said at least one vane between its open and closed positions in response to actuation of said drive assembly and to permit slideable contact with said vane.

1 more element

Dependencies are inferred from the claim text.

Automatic, temperature responsive damper assembly

Life of this patent

Automatic, temperature responsive damper assembly

Life of this patent

Abstract

Claims6