Duplex thermostat

Details Duplex thermostat Duplex thermostat

1977-04-04

1978-09-05

Harris, George

Electricity: electrothermally or thermally actuated switches

Thermally actuated switches

With bimetallic element

337340, 337364, H01H 3752

Patent

active

041124065

ABSTRACT:
A thermostat is provided for controlling a heating apparatus having two individually actuatable heating elements in order to more accurately control the heat output of the apparatus. The thermostat is designed such that at environment of temperatures below a set temperature t.sub.1, less than the desired temperature t, both heating elements are actuated. As the environmental temperature increases beyond the set temperature t.sub.1, the thermostat deactuates the main heating element and the secondary heating element alone is controlled to regulate variations in environmental temperature around the desired temperature level t. Both thermostatic functions are combined in a single device. Means are provided for adjusting the desired temperature level t and the set temperature t.sub.1 simultaneously for maintaining the difference .DELTA. t therebetween at a constant magnitude. Further, means are also provided for adjusting the difference .DELTA. t between the set temperature t, and the desired temperature level t.sub.1. The result is energy conservation and a more stable environmental temperature.

REFERENCES:
patent: 2930874 (1960-03-01), Andrews
patent: 3223807 (1965-12-01), Grahl
patent: 3254184 (1966-05-01), Huffman et al.

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