Method of manufacturing a coil heater of an indirectly-heated ty

Details Method of manufacturing a coil heater of an indirectly-heated ty Method of manufacturing a coil heater of an indirectly-heated ty

1977-12-15

1979-04-10

Lanham, C. W.

Electric lamp and discharge devices

Electrode and shield structures

Indirectly heated cathodes

29611, 29618, 140 715, 242 715, 338296, H05B 100

Patent

active

041491041

ABSTRACT:
A coil heater of a heater-type tube comprises a main portion for generating heat and a pair of leg portions supporting the main portion. Lead wires are connected to the ends of the legs. At least a part of the leg portion, including its terminal part, comprises a triple-layer coil. The main portion comprising a single-layer coil and the leg portion except its terminal part covered with an insulating coating. The main portion and leg portions are formed by continuously winding a heater wire about a core alternately in opposite directions.

REFERENCES:
patent: 1972162 (1934-09-01), Parrott
patent: 2287460 (1942-06-01), Wagenhals
patent: 3124169 (1964-03-01), Schade
patent: 3303859 (1967-02-01), Ackermann
patent: 3869692 (1975-03-01), Larson
patent: 3943328 (1976-03-01), Cunningham

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