Cartridge heater

Details Cartridge heater Cartridge heater

1987-01-29

1988-08-09

Goldberg, E. A.

Electrical resistors

Incased, embedded, or housed

Element inpowdered insulation with outer metallic sheath

219544, 219541, 338295, H01C 103

Patent

active

047631023

ABSTRACT:
An electrical cartridge heater includes a flat rectangular core of mica. A resistance wire is helically wound around the mica core. A cover sheet of mica is placed on one face of the wound core so that a return wire extends back without shorting against the other wires. The mica core is received in recesses in head and slug end bushings to position the element centrally within a cylindrical shell. A granular fill surrounds the core and heating element within the shell.

REFERENCES:
patent: 2522724 (1950-09-01), Scharf
patent: 2761042 (1956-08-01), Scott
patent: 3210714 (1965-10-01), Hummel
patent: 3307135 (1967-02-01), Simmons
patent: 3310769 (1967-03-01), Simmons
patent: 3622935 (1971-11-01), Oakley
patent: 3668598 (1972-06-01), Drugmand et al.
patent: 3812580 (1974-05-01), Drugmand
patent: 3813771 (1974-06-01), Skogland
patent: 4034330 (1977-07-01), Goto
patent: 4039995 (1977-08-01), Walton et al.
patent: 4039996 (1977-08-01), Handerhan

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