Sprue ejector in automatic injection molding machines

Details Sprue ejector in automatic injection molding machines Sprue ejector in automatic injection molding machines

1987-11-25

1988-11-29

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

With product ejector

264161, 425436R, 425438, 425444, B29C 4542

Patent

active

047878410

ABSTRACT:
An apparatus for removing the sprue from an injection mold, having a cylinder and an associated piston rod, in which the piston rod extends between the two halves of the mold into the runner when the injection mold is closed. Molding material is molded around the forward end of the piston rod during the injection. Upon opening of the mold the sprue fixedly carried by the forward end is removed by movement of the piston rod into the cylinder.

REFERENCES:
patent: 2330369 (1943-09-01), Marsh
patent: 3028629 (1962-04-01), Focht et al.
patent: 4085178 (1978-04-01), McNeely et al.
patent: 4124352 (1978-11-01), Pasch
patent: 4239476 (1980-12-01), Somberg
patent: 4715806 (1987-12-01), Ehrler et al.

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