Apparatus for producing disc records with a molded-in center hol

Details Apparatus for producing disc records with a molded-in center hol Apparatus for producing disc records with a molded-in center hol

1982-07-15

1983-09-06

Pavelko, Thomas P.

Plastic article or earthenware shaping or treating: apparatus

Preform severing means

Severing means is perforator

264107, 264155, 264163, 425810, B29D 1700

Patent

active

044026609

ABSTRACT:
An apparatus for molding information discs 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 hole forming pin slidably mounted in one of the mold plates and a center plate in the other mold plate in alignment with the center hole forming pin. The center hole forming pin has a recess in its end which faces the center plate and a plurality of passages extending substantially radially therethrough from the recess to the outer surface thereof. The passages allow the flow of mold material therethrough as the center hole forming pin is moved through the mold material in the forming of the center hole to reduce the force necessary to move the pin through the mold material.

REFERENCES:
patent: 4085178 (1978-04-01), McNeely et al.
patent: 4327047 (1982-04-01), McNeely
patent: 4334849 (1982-06-01), Bock
patent: 4362492 (1982-12-01), Prusak

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