Static molds – Uniting preform with molding material – Including means other than mold surface to support preform
Patent
1977-12-05
1979-06-12
Husar, Francis S.
Static molds
Uniting preform with molding material
Including means other than mold surface to support preform
249 95, 249 96, 249105, 249168, 273 59R, B29C 100
Patent
active
041578058
ABSTRACT:
An example of the shock resistant transparent polymer sphere is a billiard or pool ball. The molding apparatus includes lower and upper mold halves defining juxtaposed concave hemispherical surfaces to define a spherical mold cavity with a top fill opening on the upper mold half. Interlocking of the mold halves together is accomplished by tongue and window structures circumferentially spaced about the meeting points of the two halves at 120.degree.. A holder in the form of an annular ring is provided for supporting a central disc provided with a symbol on each of its opposite faces. The design is such that the ring when positioned in the spherical cavity defined by the mold halves supports the disc with its center coincident with the center of the spherical cavity. The molded sphere is made by a single pouring operation of resin through the fill opening, the disc and ring being encapsulated within the sphere. The composition of the resulting product is such that a bonding takes place between the disc, ring and resin material for the sphere resulting in a final sphere in which shock is absorbed by the disc, supporting ring, ink utilized in forming the symbol on the opposite faces of the disc as well as the resin as though the entire sphere were homogeneous throughout.
REFERENCES:
patent: 3068007 (1962-12-01), Satchell
patent: 3202742 (1965-08-01), Bachelder et al.
patent: 3270108 (1966-08-01), Randolph
patent: 3344468 (1967-10-01), Moslo
Fernandez Marlin D.
Haber Terry M.
Fernandez Joseph L.
Husar Francis S.
McQuade John
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