Thermally activated vent damper

Details Thermally activated vent damper Thermally activated vent damper

1990-07-10

1992-01-21

Tapolcai, William E.

Automatic temperature and humidity regulation

Miscellaneous

Burner controls with automatic cutoff

236 93R, 236101D, 248597, G05D 2308

Patent

active

050821725

ABSTRACT:
A thermally activated vent damper assembly for a flue is adapted to be situated in relation to the flue for occluding the passage of gas through the flue. A support member transverses the flue and suspends the damper member across the flue for movement between an open and a closed position. A thermally activated biasing member is operatively coupled between the support member and the damper member to bias the damper member in the open position in the presence of heat and to bias the damper member in the closed position in the absence of heat. The coupling of the biasing member between the support member and the damper member is such that potential sites for frictional inhibition of damper member movement are eliminated. Upon breakage or other failure of the biasing member to apply bias, the damper member defaults to or remains in an open position under the force of gravity, providing for a unique fail-safe feature.

REFERENCES:
patent: 2975975 (1961-03-01), Weber
patent: 3273798 (1966-09-01), Kuiper
patent: 3366333 (1968-01-01), Diehl
patent: 4283006 (1981-08-01), Fedevoltz
patent: 4361272 (1982-11-01), Prikkel, III et al.
patent: 4587706 (1986-05-01), Prikkel, III et al.

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