Retractable gas injection pin for an injection mold

Details Retractable gas injection pin for an injection mold Retractable gas injection pin for an injection mold

1991-06-12

1994-02-01

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

Means feeding fluent stock from plural sources to common...

264334, 264572, 425444, 425556, B29C 4516, B29C 4540

Patent

active

052827305

ABSTRACT:
An improved injection molding system having gas injected through an injection pin associated with an ejector pin. The injection pin is movable between a retracted position at which it is sealed from the mold cavity, to an extended position where it delivers gas into the cavity. In a first embodiment, the injection pin is powered by a cylinder to move between the extended and retracted positions. In a second embodiment, the injection pin is actuated by the pressurized gas. The improved system injects gas into a mold cavity without the requirement of a separate injection aperture. Further, the inventive injection pins have outlet ports sealed from the flow of plastic until the injection pin is extended to deliver the gas.

REFERENCES:
patent: 4009978 (1977-03-01), Hanning
patent: 4555225 (1985-11-01), Hendry
patent: 4740150 (1988-04-01), Sayer
patent: 4917594 (1990-04-01), Gellert et al.
patent: 4990083 (1991-02-01), Bernhardt

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