Thermally actuated cut-off link or switch and method of making t

Details Thermally actuated cut-off link or switch and method of making t Thermally actuated cut-off link or switch and method of making t

1979-04-02

1981-07-28

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Thermally actuated switches

With fusible, combustible or explosive material

29623, H01H 3776

Patent

active

042813093

ABSTRACT:
An ambient thermally actuated switch comprises a power lead extending longitudinally into and insulated from one end of a metal casing. The power lead made of a soft low resistance material like copper is bifurcated at its inner end to form outwardly inclining arms which, in a normally closed embodiment of the switch, makes contact with the inner surface of the casing. The arms are pressed against an insulating backing member so that the arms expand outwardly into a low resistance contact with the casing. The backing member forms part of a spring-urged, longitudinally extending, sandwich of elements extending between the ends of the casing and preferably comprising a pellet of meltable material, a first partially compressed spring, said backing member, arm-deforming means positioned contiguous to and adapted to collapse said arms when released to do so, and a second fully compressed spring applying a force acting on said deforming means to force it into an arm-collapsing position when the pellet melts. In assembling the switch, the bifurcated power lead is pushed against the backing member with a force which provides a desired measure low resistance and the power lead is anchored in this adjusted position.

REFERENCES:
patent: 3930215 (1975-12-01), Senor
patent: 3944960 (1976-03-01), Audette et al.
patent: 4025889 (1977-05-01), Schwarz
patent: 4065741 (1977-12-01), Sakamoto et al.
patent: 4075596 (1978-02-01), Plasko
patent: 4109229 (1978-08-01), Plasko

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