Bilateral heater unit

Electric heating – Heating devices – With heating unit structure

Patent

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Details

219552, 219523, 219541, 338238, 338240, 338242, H05B 344

Patent

active

041257618

ABSTRACT:
A bilateral heater unit including an elongated sheath in the form of two substantially parallel adjacent leg portions interconnected by a return bend portion formed of the elongated sheath bent back upon itself and integral with the adjacent parallel extending leg portions. Each of the leg portions is provided with a terminal portion extending outwardly from the end of the leg portion and spaced from the sheath. A resistor assembly is secured between the terminal of each of the leg portions and extends along the sheath between the terminals, the sheath between the terminals being filled with compacted powder insulation spacing the resistor assembly from the sheath. The parallel extending leg portions have opposing inner surfaces thereof spaced from one another and the resistor assembly may include at least one electrically conductive member extending within the sheath along the portion thereof for producing a non-heat generating zone thereat.

REFERENCES:
patent: RE26522 (1969-02-01), Fessenden
patent: 1731119 (1929-10-01), Abbott et al.
patent: 1903142 (1933-03-01), Schellenger
patent: 1948354 (1934-02-01), Lodge
patent: 1987118 (1935-01-01), Lodge
patent: 2157884 (1939-05-01), Backer
patent: 2455102 (1948-11-01), Temple
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patent: 3225321 (1965-12-01), Walter
patent: 3286082 (1966-11-01), Norton
patent: 3409855 (1968-11-01), Bender et al.
patent: 3621203 (1971-11-01), Geomini et al.
patent: 3646322 (1972-02-01), Speckman
patent: 3750081 (1973-07-01), Miller
patent: 3898431 (1975-08-01), House et al.
patent: 3943328 (1976-03-01), Cunningham
patent: 3982099 (1976-09-01), Churchill

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