Thermal switch

Details Thermal switch Thermal switch

1997-11-24

1998-12-01

Picard, Leo P.

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

With longitudinally expansible solid element

429 61, 337 14, 337298, 337333, H01H 6100, H01H 3732, H01M 200

Patent

active

058444645

ABSTRACT:
A thermal switch assembly includes a dielectric spacer and a switch blade member of shape memory metal sandwiched between a pair of flat metal plates. The spacer provides a cavity between the plates, and the switch blade member has a switch blade portion projecting into the cavity. The switch blade member has a mounting portion engaging one of the metal plates, and the switch blade portion normally is under bending stress in engagement with the other metal plate to provide a current path between the plates. At elevated temperatures, the switch blade portion of shape memory metal moves out of engagement with the other metal plate to interrupt the current path. Fasteners integral with the dielectric spacer cooperate with the metal plates and the switch blade member to hold the switch assembly together with the spacer and the mounting portion of the switch blade member compressively sandwiched between the metal plates.

REFERENCES:
patent: 3213250 (1965-10-01), Marcoux
patent: 4782318 (1988-11-01), Boulanger
patent: 4855195 (1989-08-01), Georgopoulos et al.
patent: 4975341 (1990-12-01), Tucholski et al.
patent: 4992339 (1991-02-01), Georgopoulos
patent: 5188909 (1993-02-01), Pedicini

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