Fluid assist valve-gate bushing with concentric pin members

Details Fluid assist valve-gate bushing with concentric pin members Fluid assist valve-gate bushing with concentric pin members

1996-12-31

1999-03-16

Ryan, Patrick

Plastic article or earthenware shaping or treating: apparatus

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

2643288, 264572, 425546, 425564, B29C 4517

Patent

active

058826939

ABSTRACT:
Apparatus for fluid-assisted injection molding systems or co-injection molding systems. A pair of concentric movable pin members are positioned in a mold bushing and selectively controlled to facilitate or prevent the passage of molten plastic material and a fluid into the mold cavity. An inner pin member is positioned within a hollow pin member and both pin members are controlled by piston members which are selectively moved in a block member by selective pressurization from a hydraulic or pneumatic source. Movements of the piston members selectively controls the operation of the pin members and thus the operation of the fluid-assisted injection molding system.

REFERENCES:
patent: 3947175 (1976-03-01), Melcher
patent: 3947177 (1976-03-01), Eckardt
patent: 3972664 (1976-08-01), Fillmann
patent: 4657496 (1987-04-01), Ozeki et al.
patent: 5135703 (1992-08-01), Hunnerberg et al.

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