Thermal responsive electrical switching device and calibration m

Details Thermal responsive electrical switching device and calibration m Thermal responsive electrical switching device and calibration m

1979-02-12

1980-09-02

Harris, George

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

With bimetallic elements

337368, 29622, H01H 6108

Patent

active

042209390

ABSTRACT:
A thermal responsive electrical switching device provides an electrical connection between first and second electrical connectors when the temperature of the switching device is less than a first predetermined temperature level and terminates the electrical connection when the temperature of the device exceeds the first predetermined temperature level. The electrical connection is not re-established until after the temperature of the switching device has dropped below a second predetermined temperature level which is less than the first predetermined temperature level. The switching device includes an actuator means mounted on a bimetal blade which causes a snap contact blade to be snapped into first and second snap positions as a result of movement of the bimetal blade. The actuator means includes first and second actuators which are embedded in a curable material. The switching device is calibrated adjusting the position of a movable contact and a snap contact and heating the switching device to the first predetermined temperature. The curable material is thereafter cured to fix the positions of the first and second actuators with respect to the bimetal blade.

REFERENCES:
patent: 2627003 (1953-01-01), Porter
patent: 3223808 (1965-12-01), Wehl
patent: 3230607 (1966-01-01), Gelzer
patent: 3577111 (1971-05-01), Nardulli
patent: 4047141 (1977-09-01), Holden

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