Apparatus for compression molding recorded discs
AssigneeRCA Corporation
InventorJohn J. Prusak
Life of this patent
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Abstract
An apparatus for molding a recorded disc includes a pair of mold plates, at least one of which is movable toward and away from the other, and adapted to form a mold cavity therebetween, a center hold forming pin slidably mounted in one of the mold plates and a center plate in the other mold plate opposite the center hole forming pin. The center hole forming pin and/or the center plate includes a removable end plate at its surface which is harder than the rest of the center hole forming pin or center plate. The harder end plate has longer wear properties and can be easily and quickly replaced when it does become worn.
Claims9
In an apparatus for molding a recorded disc which includes a pair of mold plates adapted to form therebetween a disc mold cavity, 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 and a center plate in the other mold plate at the center of the mold cavity with each of the center hole forming pin and center plate having surfaces which mate to form the center hole in the disc, the improvement comprising:
- the portion of at least one of the center hole forming pin or center plate having its mating surface removably secured to its respective part and being of a material harder than the material of its respective part.
Dependencies are inferred from the claim text.