Electricity: electrothermally or thermally actuated switches – Thermally actuated switches – With bimetallic element
Patent
1979-02-12
1981-02-03
Beha, Jr., William H.
Electricity: electrothermally or thermally actuated switches
Thermally actuated switches
With bimetallic element
29622, 337299, H01H 3720
Patent
active
042491541
ABSTRACT:
A temperature responsive electrical switching device provides an electrical connection between first and second electrical connectors when the temperature of the device is less than a predetermined threshold temperature and terminates the electrical connection when the temperature of the switching device exceeds the predetermined threshold temperature. The device includes a non-conductive mounting post assembly and stationary and movable contact blades mounted thereon. A temperature responsive bimetal blade cooperates with a non-conductive actuator to move the flexible contact blade out of contact with the stationary contact blade when the predetermined threshold temperature is exceeded. The actuator means includes a non-conductive means defining a cavity holding a quantity of resin which engages the flexible contact blade. By placing the switching device in an oven at a selected temperature, the actuator means is moved by the bimetal blade to the desired position for proper calibration. Subsequently the resin is cured and the position of the actuator means thereby fixed with respect to the flexible contact blade. A switching device including two flexible contact blades and two stationary contact blades, with one set of blades actuated at a maximum predetermined temperature threshold and the other set of blades actuated at a minimum predetermined threshold temperature is calibrated in a similar manner.
REFERENCES:
patent: 3230607 (1966-01-01), Gelzer
patent: 3787793 (1974-01-01), Willson
patent: 3816910 (1974-06-01), Jess et al.
patent: 4033029 (1977-07-01), Wolfe
patent: 4047141 (1977-09-01), Holden
patent: 4090166 (1978-05-01), Burch
Beha Jr. William H.
Emerson Electric Co.
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