Apparatus for replicating centrally apertured video disc records

Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under...

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264106, 264328, 425568, 425810, B29F 100, B29C 100, B29C 114

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041859553

ABSTRACT:
Heated material is injected into an annular cavity, defined by a pair of mold halves, through a sprue passage, defined by a sprue bushing and an end portion of a punch. The annular cavity and the sprue passage form, respectively, the centrally apertured part and a sprue. After partial cooling of the heated material, the punch is locked in place while the annular cavity is displaced relative to the sprue passage so that the sprue is severed from the part along the peripheral surface of the punch end portion. The mold halves are separated to open the annular cavity while the sprue is resting on the punch end portion, and while the part is held by the punch end peripheral surface. After the mold halves are separated, a sprue ejector member is actuated to eject the sprue from the punch end portion. The finished video disc is then removed, carried by the moving platen of the moving mold assembly.

REFERENCES:
patent: 3989436 (1976-11-01), McNeely et al.
patent: 4085178 (1978-04-01), McNeely et al.

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