Controlled droop thermostat
AssigneeFederal Pioneer Electric Limited
InventorsJohn B. Thorsteinsson, Herbert T. Hazleton
Life of this patent
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Abstract
Limited droop thermostats in which a bimetal tongue extends from an end of the main ambient temperature-sensing bimetal. The tongue responds to heat emitted by the thermostat switch and acts to compensate for the incidental exposure of the main bimetal to switch heat. In the preferred embodiment the projecting end of the compensating tongue is mechanically fixed and one end of the main bimetal is unitary with and carried by the base of the compensating tongue. Certain features of the invention are present in another embodiment in which the main bimetal element has a conventional supporting pivot at one end and the set-point adjusting end of the main bimetal carries the compensating tongue whose projecting end is movable and actuates the thermostat switch.
Claims12
A thermostat for controlling the current in a load in response to ambient temperature, including a switch, cam means for adjusting the set-point of the thermostat and ambient temperature sensing means for controlling the switch, said ambient temperature sensing means comprising an elongated ambient temperature sensing bimetal element, a compensating bimetal element having a portion that is integral with a portion of the ambient temperature sensing bimetal element with the high expansion surfaces of the integrated portions of the bimetal elements facing in the same direction, said bimetal elements being disposed to act differentially on the switch in response to changes in temperature, and said compensating bimetal element being more closely heat-coupled to the switch than any incidental heat coupling of the ambient temperature sensing bimetal element with the switch.
Dependencies are inferred from the claim text.