Electric heating – Heating devices – Combined with container – enclosure – or support for material...
Patent
1992-01-16
1992-12-15
Walberg, Teresa J.
Electric heating
Heating devices
Combined with container, enclosure, or support for material...
219446, 219448, H05B 374
Patent
active
051719738
ABSTRACT:
A radiant electric heater arrangement for connection to a power supply system providing first and second different power supply voltages, for example 120 volts and 240 volts, includes a heater having at least first and second heating elements, a rectifier and a switch coupled to the heating elements and to the rectifier. The switch is able to couple the heating elements and the rectifier in a number of different configurations including (a) coupling the heating elements selectively in series and in parallel with one another; (b) coupling the heating elements selectively to the first and second power supply voltages; and (c) coupling the rectifier selectively in series with at least one of the heating elements, thus providing a plurality of user selected power output levels of the heater. Where three or more heating elements are provided, at least one of the heating elements is preferably an infra-red lamp.
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Ceramaspeed Limited
Dorman Ira S.
Walberg Teresa J.
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