Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With means to heat or cool
Patent
1978-06-26
1981-04-07
Pavelko, Thomas P.
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With means to heat or cool
249 79, 264106, 425552, 425810, B29D 1700, B29F 108
Patent
active
042603609
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: 2160108 (1939-05-01), Reid
patent: 2613395 (1952-10-01), Massler
patent: 3619449 (1971-11-01), Berard
patent: 3830459 (1974-08-01), Strausfeld
patent: 3932097 (1976-01-01), Press
patent: 4085178 (1978-04-01), McNeely
Holmes John R.
Jordan Roy G.
Clark Ronald J.
MCA Disco-Vision, Inc.
Pavelko Thomas P.
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