Thermally responsive switch

Details Thermally responsive switch Thermally responsive switch

1974-12-09

1976-03-23

Harris, G.

Electricity: electrothermally or thermally actuated switches

Thermally actuated switches

With bimetallic element

337365, 337380, H01H 3712

Patent

active

039463524

ABSTRACT:
A thermally responsive electrical switch characterized by low cost and long reliable service life includes a precalibrated snap-acting thermostatic member which is positioned outside the electrical circuit of the switch in heat-transfer relation to heater terminal means in the switch, whereby the member is economically mounted without requiring calibration during or after switch assembly and is arranged to avoid the deleterious effects of high current surges in the switch but is responsive to the occurrence of selected current levels in the switch to open the switch with snap action. Preferably spring biased cam means cooperate with the snap-acting member to permit initial snapping movement of the member while the member is free of significant loading, thereby to assure that such snapping movement occurs at precisely predetermined temperatures throughout the life of the switch.

REFERENCES:
patent: 3067306 (1962-12-01), Epstein
patent: 3462722 (1969-08-01), Bletz
patent: 3624354 (1971-11-01), Heidorn

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