Plastic article or earthenware shaping or treating: apparatus – Distinct means to feed – support or manipulate preform stock... – And means to apply stress to preform and uniting in stressed...
Patent
1977-11-02
1979-09-11
Briggs, William R.
Plastic article or earthenware shaping or treating: apparatus
Distinct means to feed, support or manipulate preform stock...
And means to apply stress to preform and uniting in stressed...
249 83, 425129R, B29F 110
Patent
active
041673794
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: 2687260 (1954-08-01), Morin
patent: 2724864 (1955-11-01), Krotz
patent: 3293694 (1966-12-01), Taylor, Jr.
patent: 3375312 (1968-03-01), Hart
patent: 3608049 (1971-09-01), Tavella
patent: 3626051 (1971-12-01), Liautaund
patent: 3813197 (1974-05-01), Ray et al.
American Antenna Corporation
Briggs William R.
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