Method of making a solid state electrical switch

Details Method of making a solid state electrical switch Method of making a solid state electrical switch

1978-03-08

1981-05-19

Moon, Charlie T.

Metal working

Method of mechanical manufacture

Electrical device making

29612, 338 22R, 338220, H01C 700

Patent

active

042676355

ABSTRACT:
A solid state electrical switch of versatile and economical structure for use in starting a split-phase electrical motor incorporates a single cup-shaped dielectric casing open at one end. A first terminal disposed within the casing has a connector portion extending through the casing wall to receive connection from the starting winding of such a motor. A ceramic-type resistor element of positive temperature coefficient (PTC) of resistivity which displays a sharp increase in resistivity when it is heated to a selected temperature by directing electrical current through the resistor is disposed in engagement with the first terminal within the casing. The PTC resistor element is formulated so that the same size element is suitable for different applied voltage levels. A second terminal which has a heat-dissipating plate portion closing the open casing end and engaging the resistor element has a connector portion of the terminal extending through the casing wall for receiving connection from the main winding of such a motor.

REFERENCES:
patent: 3586939 (1971-06-01), Buiting
patent: 3716407 (1973-02-01), Kahn
patent: 3737752 (1973-06-01), Strachan
patent: 3742419 (1973-06-01), Martzloff
patent: 3794949 (1974-02-01), Larsen
patent: 3835434 (1974-09-01), Kahn
patent: 3842188 (1974-10-01), Petersen
patent: 3878501 (1975-04-01), Moorhead
patent: 3925748 (1975-12-01), Slocum

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