Method of assembling a normally closed thermally actuated cut-of

Details Method of assembling a normally closed thermally actuated cut-of Method of assembling a normally closed thermally actuated cut-of

1979-06-27

1981-01-20

Broome, Harold

Oscillators

Relaxation oscillators

337408, H01H 3776

Patent

active

042465648

ABSTRACT:
A method of assembling a normally-closed ambient thermally actuated switch comprises assembling into the open end of a casing a sandwich of elements including a meltable pellet, one or more springs, a backing member and a contact arm-deforming member which is released for movement under pressure of one of the springs when the pellet is melted at a given ambient control temperature. A power lead having resilient outwardly inclining contact arms at the inner end thereof and an axially outwardly facing shoulder is positioned in the casing so that the outer sides of the arms engage the backing member and the inner sides of the arms are confronted by the contact arm-deforming member. A rigid closure member is positioned around the power lead at the open end of the casing, where it bears against said shoulder and said sandwich of elements, and the closure member is then externally forced inwardly of the casing to bias the springs and to press the contact-forming arms of the power conductor against the backing member, to expand the same into forced engagement with the casing. This force is adjusted to provide a desired contact resistance between the contact-forming arms and the casing. The closure means is anchored in place on the casing with the adjusted force maintained on the power lead by the anchored closure member.

REFERENCES:
patent: 4109229 (1978-08-01), Plasko

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