Molding apparatus with rotatable sprue bushing

Details Molding apparatus with rotatable sprue bushing Molding apparatus with rotatable sprue bushing

1992-11-12

1994-12-20

Heitbrink, Jill L.

Plastic article or earthenware shaping or treating: apparatus

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

With coupling between charger and mold

425568, 425574, 26432812, B29C 4527, B29C 4556

Patent

active

053741838

ABSTRACT:
A molding apparatus includes a rotatable sprue bushing mounted in mold halves and formed with a sprue therein for introducing material into a mold cavity. The sprue communicates with a gate, as an outlet of the sprue, located at a position radially displaced from a center axis of the sprue bushing. Since the sprue bushing is rotated by a ring gear driven by a motor provided in or beside the mold half, the gate of the sprue rotates around the center axis when molten resin is introduced into the mold cavity, and therefore, the molding apparatus can eliminate localization of stress in molded articles, thereby improving quality of the molded articles.

REFERENCES:
patent: 3356242 (1967-12-01), Cleereman
patent: 3940226 (1976-02-01), Verhoeven
patent: 4560342 (1985-12-01), Ishida et al.
patent: 5017127 (1991-05-01), Majerus et al.
patent: 5221538 (1993-06-01), Gasami et al.

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