Electricity: circuit makers and breakers – Special application – Liquid or moisture responsive
Patent
1981-04-09
1984-02-28
Little, Willis
Electricity: circuit makers and breakers
Special application
Liquid or moisture responsive
200153T, 200335, H01H 2104
Patent
active
044343302
ABSTRACT:
A environmentally sealed snap action switch mechanism suitable for use in high temperature (900.degree. F.+) environments comprises a casing having a flex area formed on one surface so as to be susceptible to snap-action movement. A switch is situated inside the casing. An inner actuator leaf affixed at one end to the flex area links the latter with the switch. An outer actuator leaf is affixed to the flex area on the outside of the casing. The outer and inner actuator leaves move in concert to open and close the switch and cause the flex area to snap between normal and actuated conditions. To ensure proper performance at high temperatures, a helper leaf spring extends between the outer actuator arm and the exterior surface of the casing to bias the outer actuator arm away from the casing. Preferably, the switch includes a flexible steel blade, and, in one version, includes a two-layer blade to achieve extended switch life.
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Little Willis
Robinson, Jr. Lee C.
Tri-tech, Inc.
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