Static molds – Container-type molding device – And an inner removable core to form recess or opening
Patent
1979-08-14
1981-05-19
Moon, Charlie T.
Static molds
Container-type molding device
And an inner removable core to form recess or opening
2643288, 425555, 425DIG10, B28B 716, B28B 124, B29F 100, A23P 100
Patent
active
042680034
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: 1580485 (1926-04-01), Hahn
patent: 2378586 (1945-06-01), Schultz
patent: 2544140 (1951-03-01), Dafsen et al.
patent: 2583441 (1952-01-01), Palmer
patent: 2631333 (1953-03-01), Brown
patent: 2783502 (1957-03-01), Abplanalp
patent: 2873482 (1959-02-01), Bridge et al.
patent: 3044127 (1962-07-01), Alden
patent: 3923949 (1975-12-01), Kane
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