Electricity: electrothermally or thermally actuated switches – Electrothermally actuated switches – With bimetallic elements
Patent
1975-10-14
1978-05-09
Broome, Harold
Electricity: electrothermally or thermally actuated switches
Electrothermally actuated switches
With bimetallic elements
337365, 337370, H01H 6102, H01H 7116
Patent
active
040889769
ABSTRACT:
A thermally operated actuator useful as a relay, flasher, circuit breaker, or the like, in which a bimetal element is movable by heating and cooling in response to an electrical resistance heater and/or current passing through the bimetal element. In one form of the invention ambient compensation is achieved by rigidly clamping one end of the bimetal element to provide a cantilever support, and providing a support at the other end that either clamps or pivotally engages the bimetal element and longitudinally compresses the element, causing the element to buckle into a curved configuration. Heat is applied selectively to the bimetal element adjacent either end to produce a snap action change in the shape of the element between two fixed positions. In an alternative form of the invention, two parallel bimetal elements are linked together to provide ambient compensation while still providing the snap action change in shape in response to selectively applied heat.
REFERENCES:
patent: 1492844 (1924-05-01), Hall
patent: 1881919 (1932-10-01), Patton
patent: 2113227 (1938-04-01), Bokeeno
patent: 2284383 (1942-05-01), Elmer
patent: 2336408 (1943-12-01), Matthews
patent: 2486714 (1949-11-01), Koci
patent: 2905790 (1959-09-01), Markham
patent: 3019319 (1962-01-01), Anderson
patent: 3207872 (1965-09-01), Nauer
patent: 3842382 (1974-10-01), Bell
Broome Harold
Technar, Inc.
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