Ball for ball game and molding apparatus for forming the same
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United States of America Patent
Stats
-
Jan 10, 1995
Issued Date -
N/A
app pub date -
Jul 22, 1993
filing date -
Oct 16, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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