Dual calibration thermostatic switch having a wide operating ran

Details Dual calibration thermostatic switch having a wide operating ran Dual calibration thermostatic switch having a wide operating ran

1996-03-01

1998-07-14

Picard, Leo P.

Electricity: electrothermally or thermally actuated switches

Thermally actuated switches

With bimetallic element

337333, 337365, 337368, H01H 3700, H01H 3754

Patent

active

057810974

ABSTRACT:
A thermostatic switch that utilizes a snap acting bimetal blade that deforms at an actuation temperature and returns to an undeformed state at a reset temperature. Actuation and reset projections, preferably in the form of dimples, are provided to calibrate the switch. The bimetal blade has a centrally located, cupped or dish-like snap acting depression. The reset dimple is spaced below the bimetal blade between the snap acting depression and the free end of the bimetal blade instead of substantially directly below the moveable contact as in the prior art. Accordingly, the thermostatic switch may be used in relatively high voltage settings of up to approximately 600 volts without the occurrence of arcing.

REFERENCES:
patent: 4389630 (1983-06-01), Ubukata et al.
patent: 4517541 (1985-05-01), Ubukata et al.
patent: 4823105 (1989-04-01), Givler
patent: 5014034 (1991-05-01), Wehl
patent: 5268664 (1993-12-01), Givler

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