Automatic temperature and humidity regulation – Miscellaneous – Burner controls with automatic cutoff
Patent
1981-11-12
1983-06-07
Tapolcai, William E.
Automatic temperature and humidity regulation
Miscellaneous
Burner controls with automatic cutoff
236 93R, 236101B, G05D 2308
Patent
active
043867316
ABSTRACT:
A thermally controlled damper construction for a gas fired combustion apparatus such as a furnace, water heater or the like, is described. The damper is pivotally mounted within the stack of the combustion apparatus for pivotal movement from a closed position to a full open position. A thermally responsive device is disposed in the stack on the upstream side of the damper for opening and closing the damper in response to predetermined temperatures. The thermally responsive device comprises a shaft mounted in the stack which extends thereacross and which has the damper rotatably mounted thereon. A helical bi-metal element embraces the shaft between the ends thereof and comprises first and second bi-metal members which are secured together in an end-to-end relationship. The first and second bi-metal members are oppositely disposed with respect to each other whereby the first bi-metal member yieldably urges the damper to its open position when it is subjected to a predetermined temperature and whereby the second bi-metal member yieldably urges the damper towards its closed position when subjected to a predetermined temperature. A heat sink structure is provided adjacent the second bi-metal member so that the second bi-metal member will be initially slowly heated and subsequently cooled more slowly.
REFERENCES:
patent: 1578112 (1926-03-01), Ernst
patent: 1784608 (1930-12-01), Meyers
patent: 3174687 (1965-03-01), Gilbert
patent: 4114805 (1978-09-01), Humphreys et al.
patent: 4151952 (1979-05-01), Edwards
patent: 4165833 (1979-08-01), Nagel
patent: 4273283 (1981-06-01), Edwards
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