Typewriting machines – Including type-set-assemblage mounted on carrier and... – Type-head – per se
Patent
1979-06-22
1981-04-28
Hoag, W. E.
Typewriting machines
Including type-set-assemblage mounted on carrier and...
Type-head, per se
264161, 264267, 264273, 264275, 4001442, B29D 300, B41J 900
Patent
active
042642221
ABSTRACT:
A method of manufacturing the molded hub of a print wheel of the type having a central axial passage of precise diameter and a plurality of elastically deformable, concentrically arranged character carrying radial arms. A metal ring carrying radial passageways is centered in the mold cavity used for forming the hub, etc., and a plastics composition is injected into the mold cavity only through the center of the ring and by way of the radial passageways whereby the metal ring becomes a unitary permanent part of the hub and defines the central axial passage. After the molding, the molded structure is released from the mold and the remainent central plastic plug easily is sheared from the ring, as by punching, for example. Remainent plastic material left within the radial passageways functions supplementary to maintain the stability and concentricity of the ring and hub assembly.
REFERENCES:
patent: 2277543 (1942-03-01), Downs
patent: 2288187 (1942-06-01), Gits et al.
patent: 3302242 (1967-02-01), Morin
patent: 3861646 (1975-01-01), Douglas
patent: 3935937 (1976-02-01), Tramposch
patent: 4037706 (1977-07-01), Sohl et al.
patent: 4128346 (1978-12-01), Ragland
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