Snap action thermally responsive switch

Details Snap action thermally responsive switch Snap action thermally responsive switch

1981-03-06

1983-06-21

Beha, Jr., William H.

Electricity: electrothermally or thermally actuated switches

Thermally actuated switches

With bimetallic element

337 89, 337368, H01H 3754

Patent

active

043896308

ABSTRACT:
A thermally responsive switch comprises a housing enclosing a contact arm bearing a fixed contact and a thermally responsive snap-acting element designed to move and return with snap action depending upon the degree of switch self-generated heat or the ambient temperature. One end of the snap-acting element carries a movable contact and its other end is the supporting portion connected to a metallically elastic member mounted in the housing. To a stationary member integrated with the housing, an end support element and a central support element are respectively mounted. The end support element engages the supporting portion of the snap-acting element against the elastically urging force of the elastic member to push in one direction, while the central support element engages a middle portion of the snap-acting element to push in the opposite direction. In this arrangement, the metallically elastic member is urged to engage the end support element elastically intermediate the snap-acting element, and at the same time, urging the snap-acting element in the direction its movable contact travels for opening the contacts. This configuration makes it possible that each of the two support elements engage the snap-acting element with a certain pressure when the thermally snap-acting element respectively moves and returns.

REFERENCES:
patent: 2289095 (1942-07-01), Bletz
patent: 2967920 (1961-01-01), Harper et al.
patent: 3223808 (1965-12-01), Wehl

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