Electricity: electrothermally or thermally actuated switches – Thermally actuated switches – With fusible – combustible or explosive material
Patent
1982-04-12
1983-08-30
Broome, Harold
Electricity: electrothermally or thermally actuated switches
Thermally actuated switches
With fusible, combustible or explosive material
337407, 337409, H01H 3776
Patent
active
044019653
ABSTRACT:
A single use thermal switch having a tubular casing within which a mechanical isolation cage is axially movable. The cage is normally urged by a helical compression spring against a fusible pellet which melts at a temperature at which it is desired to disconnect the electrical circuit. An electrically conductive contact member extending transversely through the isolation cage is normally urged by a helical compression spring toward one end of the cage and against the end of one electrical lead that is coaxial with the casing. The contact member is foldable along a line across its center. The force of the contact member pressed against the end of the lead urges the contact member to fold to cause the ends thereof to be forced against the inside wall of the casing to establish electrical connection between the casing and the lead through the contact member.
REFERENCES:
patent: 3519972 (1970-07-01), Merrill
patent: 4060787 (1977-11-01), Budnik
patent: 4145654 (1979-03-01), Grimm
patent: 4246564 (1981-01-01), Olson et al.
Backlund Sven
Grimm Forrest R.
Alexander Cruzan
Broome Harold
Minnesota Mining and Manufacturing Company
Qualey Terryl K.
Sell Donald M.
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