Heat exchange – Movable heating or cooling surface – Rotary drum
Patent
1988-11-28
1990-04-24
Ford, John
Heat exchange
Movable heating or cooling surface
Rotary drum
165 27, 236 1C, 236 78A, 337331, 337373, 337374, G05D 2308, F25B 2900
Patent
active
049191969
ABSTRACT:
There is disclosed a thermostat controlled apparatus which controls the operation of a heating system and a cooling system in response to temperature variations in a given environment. The thermostat has a three-electrode mercury switch which is coupled to a single bimetallic element which rotates the switch in response to temperature variations. The switch has a housing containing a pool of mercury and three electrodes extending within. A common electrode is connected to a voltage source. A second electrode is connected to the cooling system. A third electrode is connected to the heating system. Tilting the switch clockwise causes the mercury to connect the second and common electrodes, thereby energizing the cooling system; tilting the switch counterclockwise causes the mercury to connect the third electrode and common electrode, thereby energizing the heating system. In this manner, the single switch automatically controls both the heating and cooling operations, thereby maintaining the desired temperature within a given range. The range is determined by the configuration of the housing.
REFERENCES:
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patent: 1960856 (1934-05-01), Stacey
patent: 2969916 (1961-01-01), Shequen
patent: 3014704 (1961-12-01), Bierwirth et al.
patent: 3975703 (1976-08-01), Andresen, Jr.
patent: 3993120 (1976-11-01), Iberg et al.
patent: 4536727 (1985-08-01), Romano
patent: 4687050 (1987-08-01), Podlipnik
patent: 4775099 (1988-10-01), Podlipnik
Ford John
Plevy Arthur L.
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