Electricity: electrothermally or thermally actuated switches – Electrothermally actuated switches – With bimetallic elements
Patent
1975-05-30
1976-08-03
Harris, George
Electricity: electrothermally or thermally actuated switches
Electrothermally actuated switches
With bimetallic elements
337346, 337360, H01H 6108
Patent
active
039732320
ABSTRACT:
A thermally-responsive circuit-breaking device with an adjustable temperature set-point. The device is provided with a thermally-responsive element controlling an electric switch. In one embodiment, the temperature set-point is dependent on the width of a gap between respective portions of the element and the switch. One of the portions is a surface inclined away from and engagable by the other portion. By adjustably positioning the element and switch relative to one another the portions are aligned to engage at different points along the inclined surface to thereby vary the gap. In the other embodiment, the switch and the element have respective overlapping and engaging portions with the temperature set-point being dependent on the amount of overlap. As the element moves in response to temperature change in a given sense, the overlapping portions slide over each other until at one position of the element the overlap is eliminated causing the switch to open. One of the overlapping portions is contoured so as to alter the amount of overlap as the element and switch are adjustably positioned relative to one another.
REFERENCES:
patent: 2716175 (1955-08-01), Franklin
patent: 3366756 (1968-01-01), Watson
patent: 3913048 (1975-10-01), Mertler
American Thermostat Corporation
Harris George
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