Thermally responsive switch and method of making the same

Details Thermally responsive switch and method of making the same Thermally responsive switch and method of making the same

1992-07-01

1993-03-23

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Thermally actuated switches

With bimetallic element

337 3, 337378, H01H 3712, H01H 3754, H01H 3700

Patent

active

051968207

ABSTRACT:
A thermally responsive switch includes an elliptic dome-shaped metal receptacle, a header metal plate hermetically secured to the receptacle and having a through-aperture at one of two longitudinal ends, an electrical conductor inserted through the aperture of the header plate and secured with an electrically insulating material such as glass, a support having at one of two longitudinal ends a fixed portion secured to the end of the conductor in the receptacle and a supporting portion positioned away from its other end in the direction of the fixed portion, a bimetal secured at one of its two ends to the supporting portion of the support and carrying a movable contact at the other end, the bimetal having a central shallow dish-shaped portion reversing its curvature with a snap action in response to the temperature, a fixed contact secured to the header plate in the vicinity of its other longitudinal end, and a calibrator interposed between the inner wall of the receptacle and the other end of the support opposing the movable contact. The calibrator is moved, pushing the other end of the support when the receptacle wall corresponding to the calibrator is deformed for calibration of an operating temperature of the switch, so that the support is bent in the vincity of the fixed portion such that a contact pressure between the movable and fixed contacts is varied.

REFERENCES:
patent: 4167721 (1979-09-01), Senor et al.

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