Multiple contacts, snap-action, thermal switch

Details Multiple contacts, snap-action, thermal switch Multiple contacts, snap-action, thermal switch

1981-02-27

1983-02-15

Beha, Jr., William H.

Electricity: electrothermally or thermally actuated switches

Thermally actuated switches

With longitudinally expansible solid element

200 67B, 337390, 337392, 337396, H01H 3746

Patent

active

043743730

ABSTRACT:
A snap-action thermal switch adapted to be operated by an expansion element. The switch includes a switch reed pivotable between two switching positions, a switch spring exerting force components in a longitudinal direction and in a pivoting direction of the switch reed. One end of the spring engages the switch reed and the other end of the switch spring is articulated to an adjusting element adjustable by an operating piston of the expansion element in such a way that, after attaining a predetermined position of the operating piston, the force component of the switch spring acting in a pivoting direction on the switch reed reverses direction with respect to the switch reed after traversing a zero position. At least one second pivotable switch reed is provided, with the second switch reed being articulated, through its own switch spring exerting a force component in a longitudinal direction and a force component in a pivoting direction of the second switch reed, to the adjusting element. The articulation of the second switch spring to the adjusting element and/or the arrangement of the second switch reed being selected so that a force component of the second switch spring acting in a pivoting direction of the second switch reed reverses direction with respect to the second switch reed in a second predetermined position of the operating piston of the expansion element.

REFERENCES:
patent: 3382339 (1968-05-01), Anderson
patent: 4262274 (1981-04-01), Howe et al.

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