Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – Surface finishing
Patent
1977-06-16
1978-12-19
Hoag, W.E.
Plastic and nonmetallic article shaping or treating: processes
With severing, removing material from preform mechanically,...
Surface finishing
156245, 156304, 264248, 264250, 264265, 264296, 425384, 425407, B29C 500, B29C 1700, B29H 702
Patent
active
041306198
ABSTRACT:
This invention is directed toward making hollow racquet ball balls. This is accomplished by molding a mass of vulcanizable elastic material to hollow semi-spherical form and heating the bulk of the material substantially fully to vulcanize it while simultaneously cooling a portion around the full edge so it is only partially vulcanized at the edge area thereof. Then two of such semi-spherical forms have the edges thereof abutted under some pressure to force the uncured edges together, and heat is then applied to the uncured edges of each half to fully vulcanize them and bind them together to form a unitary seamless ball thereform.
Apparatus for forming the balls includes mold means defining a hollow semi-spherical cavity with a cooling chamber being provided at the open edge of the cavity that defines an edge of the formed hollow half sphere whereby a cooling medium can be circulated at the edge to prevent vulcanization thereof while the remaining part of the hollow half sphere is heated and vulcanized.
REFERENCES:
patent: 1400146 (1921-12-01), Eggers et al.
patent: 1574113 (1926-02-01), Roberts
patent: 2726925 (1955-12-01), Saulino
patent: 3709967 (1973-01-01), Held
patent: 3832437 (1974-08-01), Taylor
patent: 3933967 (1976-01-01), Taylor
Ektelon
Hoag W.E.
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