Infinite switch and indicator

Details Infinite switch and indicator Infinite switch and indicator

1975-09-19

1977-10-04

Truhe, J. V.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

337361, H05B 102, H01H 3712

Patent

active

040525910

ABSTRACT:
An infinite switch for controlling the temperature of a stove heating element is provided with a visual indicator energized when the heating element is energized. The switch has terminals connected to an electrical power source and includes a housing, a cover with a central aperture, and a rotatable, hollow spindle extending through the aperture and into the housing. A cam mounted on the spindle interacts with two sets of switch contact elements. One set of contact elements is movable by the cam from an open to a closed position thereby connecting the power source with the second set of contact elements. The second set of switch contact elements are adjusted by the cam and are operated by a thermomotive element in heat transfer relation with a thermal heating device. The thermomotive element cycles the second set of contacts between open and closed positions alternately to energize and deenergize the heating element. The proportion of on time during each cycle is determined by the position of the cam. A knob mounted on the spindle external to the housing has a central aperture, and a lamp is positioned within the housing and adjacent the hollow spindle. The lamp may be connected in a circuit with switch contacts and energized when the controlled heating element is energized. A light transmission element is positioned within the hollow spindle and extends from the lamp to the region of the knob to transmit light from the lamp through the hollow spindle to the aperture in the knob.

REFERENCES:
patent: 2299462 (1942-10-01), Clark et al.
patent: 2462594 (1949-02-01), Beal

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