Precision injection-molded coil form and method and apparatus fo

Details Precision injection-molded coil form and method and apparatus fo Precision injection-molded coil form and method and apparatus fo

1977-08-05

1978-08-22

Kozma, Thomas J.

Inductor devices

Winding with terminals, taps, or coil conductor end...

174178, 264251, 264272, 264274, 336208, 343715, 343749, 343888, 425129R, H01F 2730

Patent

active

041092244

ABSTRACT:
A precision injection-molded form for an inductance coil comprises a cylindrical core member having a surface of relatively low dimensional precision, and a thin plastic layer molded over the surface to provide a surface of high dimensional precision for supporting the windings of the coil. Metal insert-members having threaded axial bores and radially extending wing portions are provided at either end of the core to establish electrical contact with the winding and a mounting capability for the assembly. The coil form is formed by injection molding techniques and apparatus which provide for axial compression of the assembly prior to molding to obtain a predetermined longitudinal dimension, and for equalization of forces exerted during molding to prevent longitudinal deformation.

REFERENCES:
patent: 2289197 (1942-07-01), Jones
patent: 2771604 (1956-11-01), Goldstein
patent: 2924643 (1960-02-01), Barnes
patent: 2938210 (1960-05-01), Harris
patent: 2966678 (1960-12-01), Harris
patent: 3166751 (1965-01-01), Roll
patent: 3185947 (1965-05-01), Freymodsson
patent: 3267476 (1966-08-01), Finke
patent: 3408652 (1968-10-01), Allisbaugh
patent: 3486149 (1969-12-01), Klein
patent: 3590329 (1971-06-01), Knapps, Jr.
James Liautaud, "Designing Components For B-Plastic Insert Molding," Plastics Design & Processing, Mar. 1972, pp. 13-16.

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