Electric heater

Details Electric heater Electric heater

1988-08-11

1990-06-05

Walberg, Teresa J.

Electric heating

Heating devices

Combined with container, enclosure, or support for material...

219466, H05B 374

Patent

active

049316214

ABSTRACT:
In the case of an electric heater, particularly a radiant heater for glass ceramic hotplates, there are several spirally nested heating resistors, whereof one heating resistor continuously passes through in the central field in such a way that it forms two nested spirals (10, 17) distributed approximately uniformly over the entire heating field, but which are not directly adjacent to one another and instead between their spiral turns (20, 21) is provided at least one spiral turn of a further, spirally wired heating resistor. This makes it possible in simple manner to make the length of said first-mentioned heating resistor much larger, so that it has a very high rated power, but can still be safely laid or wired in the heating field without any risk of local overheating.

REFERENCES:
patent: 1348648 (1920-08-01), Kelly
patent: 2494447 (1950-01-01), Mosthaf
patent: 3500018 (1970-03-01), Stiller
patent: 4511789 (1985-04-01), Goessler
patent: 4538051 (1985-08-01), Schreder
patent: 4713527 (1987-12-01), Kicherer

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