Ball for ball game and molding apparatus for forming the same

Details Ball for ball game and molding apparatus for forming the same Ball for ball game and molding apparatus for forming the same

1993-07-22

1995-01-10

Nguyen, Khanh

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

With product ejector

425557, 425436R, 425443, 425444, 425468, 425DIG10, 249 64, 249 661, B29C 4536, B29C 4540

Patent

active

053801857

ABSTRACT:
A molding apparatus for injection-molding a hemispherical hollow body formed of a thermoplastic elastomer and having a valve formed integrally therewith. The apparatus includes a first mold having a hemispherical convex molding surface, a second mold having a hemispherical concave molding surface larger in size than the convex molding surface. The second mold is superposed on the first mold to form a molding cavity for the hollow body. A first valve mold is removably mounted at the center of the hemispherical convex molding surface of the first mold, for forming the valve and an inside and small-diameter portion of a valve rubber insertion hole of the valve. A second valve mold is removably mounted at the center of the hemispherical concave molding surface, for forming an intermediate and large-diameter portion of the valve rubber insertion hole and an outside and small-diameter portion thereof while forming a cavity for the valve in cooperation with the first valve mold. The second valve mold includes a diametrically-enlarged portion provided at a lower end of the second valve mold for downwardly pushing the formed hollow body when the second valve mold is engaged to the second mold after the second valve is removed from the second mold.

REFERENCES:
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patent: 4340222 (1982-07-01), Kerkenbush et al.
patent: 4660831 (1987-04-01), Kralik
patent: 4765853 (1988-08-01), Hoffman
patent: 5122046 (1992-06-01), Lavallee et al.
patent: 5135700 (1992-08-01), Williams et al.
patent: 5156864 (1992-10-01), Guo
Database WPIL, Week 8551, Derwent Publications Ltd., London, GB AN 85-321253 & JP-A-60 225 581 (Molten) Abstract.
Dr. Saechiling `International Plastics Handbook` 1983, Macmillan Publishing Co., Inc. Chapter; Thermoplastics, pp. 154-157 and 214-216 Very Specially Table: 32, New York, US.

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