Electro-thermally actuated switch

Details Electro-thermally actuated switch Electro-thermally actuated switch

1995-03-03

1996-04-23

Paschall, Mark H.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219511, 219491, 337123, 337141, H05B 102

Patent

active

055105980

ABSTRACT:
A thermally-actuated switch includes a pair of switch contacts openable or closeable in response to a change in the length of a shape memory metal (SMM) rod. The SMM rod is caused to change its length by having its temperature increased by heat produced when electrical power dissipated in a heating element that is coupled in electrical circuit with the switch contacts. To this end, the heating element is thermally coupled to the SMM rod, such as by a common heatsink. Where the switch is to be openable, the heating element is preferably in series circuit with the contacts, and where the contacts are closeable, the heating element is preferably in parallel therewith.

REFERENCES:
patent: 3308271 (1967-03-01), Hilbiber
patent: 3393870 (1968-07-01), Jeffrey
patent: 3846679 (1974-11-01), Jost et al.
patent: 3858141 (1974-12-01), Lackey
patent: 4382176 (1983-05-01), Wood
patent: 4412872 (1983-11-01), Albrecht et al.
patent: 4413174 (1983-11-01), Ting
patent: 4617448 (1986-10-01), Goldowsky
patent: 4633061 (1986-12-01), Arikawa
patent: 4753465 (1988-06-01), Dalby
patent: 4884780 (1989-12-01), Ohashi
patent: 5039843 (1991-08-01), Muller
Institut National De La Propriete Industrielle, "Notification D'Un Rapport De Recherche Preliminaire," dated 23 Jan. 1995.

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