Electrical heating element

Details Electrical heating element Electrical heating element

1979-03-14

1981-01-06

Envall, Jr., Roy N.

Electric heating

Heating devices

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

338295, 338299, 338 55, 338318, H05B 300

Patent

active

042438721

ABSTRACT:
An improved electrical heating element is constructed in such a manner as to increase the amount of electrical wire per unit space available for plug-type convection heating units. The plug uses a rectangular-shaped frame which has a plurality of spool covered rods evenly spaced along the length of the frames and extending across the width. The spools are slidably attached over the rods and have an insulated spacer on each side of the spool. The heating wire has alternate coiled and straight sections and is wound over and held to each spool by a retention wire and a groove in the spool. The rods are spaced at such a distance from each other that there is a straight section of heating wire at each spool with the coiled sections located between adjacent rods.

REFERENCES:
patent: 716048 (1902-12-01), Jenkins
patent: 834424 (1906-10-01), Waters
patent: 933989 (1909-09-01), Johnson
patent: 1602804 (1926-10-01), Wilkinson et al.
patent: 2106462 (1938-01-01), Lindberg
patent: 2513945 (1950-07-01), Kitto et al.
patent: 2565769 (1951-08-01), Hatker

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