Electricity: electrothermally or thermally actuated switches – Electrothermally actuated switches – With bimetallic elements
Patent
1981-06-08
1982-07-13
Harris, George
Electricity: electrothermally or thermally actuated switches
Electrothermally actuated switches
With bimetallic elements
337335, 337370, H01H 6100
Patent
active
043397409
ABSTRACT:
A thermally responsive electric switch including two dimensionally identical, bimetallic, snap-over, part-spherical, thermally responsive actuating elements 9, 11, arranged in a nesting, contacting relationship within the end portion 7 of a housing. The first element 9 changes from a first to a second curvature when its temperature rises above a first predetermined temperature, returning to its first curvature if its temperature falls below a second, lower, predetermined temperature. The second element 11 changes from a first to a second curvature when its temperature rises above a third predetermined temperature higher than the first temperature, and thereafter remains in that curvature. A common force transmitting rod 13 bearing on the uppermost element 11 transmits the movement of both elements to a pair of contacts 3 at the other end of the housing, the contacts being in one condition when both plates have the first curvature, and otherwise being in a second condition.
REFERENCES:
patent: 2363376 (1944-11-01), Woodman
patent: 3833876 (1974-09-01), Bassett
patent: 3878499 (1975-04-01), Concin
patent: 3943480 (1976-03-01), Schmitt
Harris George
The General Electric Company Limited
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