Heater unit

Details Heater unit Heater unit

1985-12-02

1990-10-23

Reynolds, Bruce A.

Electric heating

Heating devices

With heating unit structure

H05B 344

Patent

active

049654365

ABSTRACT:
An elongated heater unit including an elongated resistor helix, terminals connected to the ends of the helix, at least a first surrounding metallic sheath, powder insulation material disposed within the first sheath and spacing the resistor helix from the sheath. The sheath is provided with at least one indentation and/or groove extending along at least a portion of the length of the first sheath. The method for constructing the heater unit includes forming the indentation by means of a roll with a protrusion, by utilizing a mandrel, by utilizing a temperature sensitive member or by utilizing a reducing sheath.

REFERENCES:
patent: 1731119 (1929-10-01), Abbott et al.
patent: 2039641 (1936-05-01), Fichtner
patent: 2102783 (1937-12-01), Bokovoy
patent: 2157884 (1939-05-01), Backer
patent: 2389587 (1945-11-01), Appleman
patent: 2424848 (1947-07-01), Reitan
patent: 3095492 (1963-06-01), Gaiennie
patent: 3195093 (1965-07-01), Dillon
patent: 3229358 (1966-01-01), Scadron et al.
patent: 3513540 (1970-05-01), Boggs
patent: 3582616 (1971-06-01), Wrob
patent: 3898431 (1975-08-01), House et al.

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