Electricity: electrothermally or thermally actuated switches – Thermally actuated switches – With fusible – combustible or explosive material
Patent
1989-11-29
1990-07-17
Picard, Leo P.
Electricity: electrothermally or thermally actuated switches
Thermally actuated switches
With fusible, combustible or explosive material
337154, 337407, H01H 3776, H01H 7120
Patent
active
049423827
ABSTRACT:
A normally closed electrical switch mechanism having fixed and movable switch assemblies, a spring assembly urging the movable switch assembly away from engagement with the fixed switch assembly to thereby open the switch, a latch member normally securing the movable switch assembly in its position of engagement with the fixed switch assembly, and a mechanism responsive to a predetermined condition external to the switch mechanism for moving the latch member so as to allow the switch to open, is improved in the following manner. A member made of thermoplastic material is positioned between the latch member and the movable switch assembly. The thermoplastic material of that member is then responsive to an overheated condition of the internal switch circuitry for losing its structural rigidity so as to release the movable switch assembly and thereby permit the spring assembly to open the switch even though the latch member remains in place.
REFERENCES:
patent: 2310531 (1943-02-01), Kuhn et al.
patent: 2416253 (1947-02-01), Furnas
patent: 3287530 (1966-11-01), Dawson
Arant Gene W.
Picard Leo P.
Vyas Nilay H.
W. P. Dawson, Inc.
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