Multiple element thermal actuator

Details Multiple element thermal actuator Multiple element thermal actuator

1980-12-15

1982-08-17

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Thermally actuated switches

With bimetallic element

236101R, 337335, 337365, H01H 3752

Patent

active

043452345

ABSTRACT:
A thermal actuator includes a housing containing a stack of deformable discs. A spring maintains a movable follower in engagement with the disc at the end of the stack. At least some of the discs are active snap-acting thermostatic bimetallic discs with first and second structural states wherein those discs are concave in first and second directions at different temperatures. The stack includes a first kind of bimetallic disc which snaps between its structural states at lower transition temperature and a second kind bimetallic disc which snaps between its structural states at a higher transition temperature. The first and second kinds of discs are alternately arranged in the stack. In one embodiment, passive discs which remain in a single structural state are disposed between adjacent pairs of the active discs.

REFERENCES:
patent: 1645290 (1927-10-01), Mottlau
patent: 2716683 (1955-08-01), Kathe
patent: 3014342 (1961-12-01), Evans
patent: 3131272 (1964-04-01), Perkins
patent: 3712282 (1973-01-01), Isley
patent: 4142676 (1979-03-01), Hattori
Crest Manufacturing Company, Inc. Literature.

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