Electric heating – Heating devices – With heating unit structure
Patent
1992-10-21
1996-01-23
Jeffrey, John A.
Electric heating
Heating devices
With heating unit structure
219542, 338240, 338301, 29615, 29611, H05B 300
Patent
active
054866820
ABSTRACT:
A cartridge heater assembly to be swaged has a sheath with head and slug ends. A resistance heater unit in the sheath includes a flat rectangular core, a resistance wire winding on the core, and first and second core covers, one on each side. Each end of the resistance wire extends from the core through a hole in the adjacent core cover and to the head end of the sheath. Crushable heater unit centralizers at each end of the sheath hold the resistance heater unit. Leads are connected to the ends of the heater wire and the connections are enclosed in the centralizer. A plastic bushing closes the head end of the sheath and a slug closes the slug end of the sheath. The heater assembly is filled with an insulating material and swaged, crushing the centralizers.
REFERENCES:
patent: 1523434 (1925-01-01), Lightfoot et al.
patent: 3080543 (1963-03-01), Boggs
patent: 3252122 (1966-05-01), Baxter
patent: 3582616 (1971-06-01), Wrob
patent: 3812580 (1974-05-01), Drugmand
patent: 3821517 (1974-06-01), Erickson
patent: 3881163 (1975-04-01), Lindroth et al.
patent: 4314401 (1982-02-01), Saku
patent: 4763102 (1988-08-01), Ritt
Acra Electric Corporation
Jeffrey John A.
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