Ambient temperature compensated bimetal thermal actuator

Details Ambient temperature compensated bimetal thermal actuator Ambient temperature compensated bimetal thermal actuator

H - Electricity

01

H

306/172

H01H 37/54 (2006.01) H01H 37/10 (2006.01)

Patent

CA 1069568

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 configura- tion. 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.

262958

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