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US 4,379,686 AGranted
Apparatus for molding a recorded disc
AssigneeRCA Corporation
InventorsRobert W. Chambers, Michael L. McNeely, Leslie A. Torrington
Life of this patent
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AssigneeRCA Corporation
InventorsRobert W. Chambers, Michael L. McNeely, Leslie A. Torrington
Estimating the term…
A molding apparatus for molding a recorded disc includes a pair of mold plates adapted to form a mold cavity therein and a center hole forming pin slidably mounted in one of the mold plates. The center hole forming pin is larger in diameter than the hole to be formed and has a projection on its end which is of a diameter equal to the hole to be formed and a length about one-half the length of the hole to be formed. The other mold plate includes a projection extending therefrom of a diameter equal to the diameter of the hole to be formed and a length one-half the length of the hole. In the molding of the disc the projection on the center hole forming pin engages the projection on the other mold plate to form a hole in which a flash is spaced from the edges of the hole.
In an apparatus for molding a recorded disc which includes a pair of mold plates adapted to form therebetween a disc mold cavity, and a center hole forming pin movable in one of the mold plates toward and away from the other mold plate at the center of the mold cavity, the improvement comprising:
Dependencies are inferred from the claim text.