Metal working – Method of mechanical manufacture – Electrical device making
Patent
1988-10-24
1989-06-13
Echols, P. W.
Metal working
Method of mechanical manufacture
Electrical device making
29611, 425549, 219541, 219544, 174 74R, 228179, H01C 1728
Patent
active
048379255
ABSTRACT:
A method of making an electrically insulated terminal in an injection nozzle. After the heating element is wound in a spiral channel on the outer surface of the main body portion of the nozzle the rear end projects radially out an opening in the collar portion. The casing is stripped from the heating element to expose the resistance wire adjacent the rear end. A steel plug having a central bore therethrough is slipped over the projecting rear end and welded into place in the opening. A steel terminal body is made with a central bore and a threaded front portion to receive an external power lead. The casing of the portion of the heating element projecting from the plug and a rear portion of the terminal body are coated with insulating material. A protective cap is securely swaged over the coating on the rear portion. The assembled cap and body are slipped over the rear end of the heating element and welded to the matching front face of the plug. The exposed resistance wire is welded to the terminal body. This structurally secures the terminal body against torque from connecting and disconnecting the external lead and electrically insulates it from the rest of the nozzle, while electrically connecting it to the resistance wire. In an alternate embodiment, the connections are made while integrally brazing the nozzle in a vacuum furnace.
REFERENCES:
patent: 1170723 (1916-02-01), Allerding
patent: 2003175 (1935-05-01), Daly
patent: 4403405 (1983-09-01), Gellert
patent: 4446360 (1984-05-01), Gellert
patent: 4557685 (1985-12-01), Gellert
patent: 4583284 (1986-04-01), Gellert
patent: 4688622 (1987-08-01), Gellert
patent: 4768283 (1988-09-01), Gellert
patent: 4768945 (1988-09-01), Schmitd et al.
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