Method of making a coil form by injection molding

Details Method of making a coil form by injection molding Method of making a coil form by injection molding

1976-10-28

1978-02-21

Hoag, Willard E.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

To produce composite, plural part or multilayered article

264259, 264266, 264272, 264275, 264320, 264328, B29D 300, B29F 110

Patent

active

040752739

ABSTRACT:
Method of making 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: 927421 (1909-07-01), Miltner
patent: 2687260 (1954-08-01), Morin
patent: 2773657 (1956-12-01), Morin
patent: 2873482 (1959-02-01), Bridge et al.
patent: 3200023 (1965-08-01), Cilker
patent: 3375312 (1968-03-01), Hart
patent: 3626051 (1971-12-01), Liautaud
patent: 3724983 (1973-04-01), Nelson

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