Pour hole closer, straight in type, for use with injection foam

Details Pour hole closer, straight in type, for use with injection foam Pour hole closer, straight in type, for use with injection foam

1988-04-18

1989-10-10

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

With step of cleaning, polishing, or preconditioning...

264 466, 2643286, 264DIG83, 425127, 4251291, 425543, 425817R, B29C 6722, B29B 1700

Patent

active

048730327

ABSTRACT:
A pour hole closure for use with an injection foam molding system including a mold assembly having a pour bushing leading to a reaction chamber. A cylinder having a slightly oversized plastic plug extending downwardly therefrom is normally positioned above the pour bushing in the mold assembly. The cylinder is pivotally movable away from its normal position against the force of resilient means. A pour head and nozzle assembly is adapted to move into engagement with the cylinder to move the latter while attaining a position wherein the nozzle is positioned above the pour bushing. The nozzle is lowered to engage the top edge of the pour bushing for injection of foam material into the reaction chamber. Upon being retracted, the pour head and nozzle are moved laterally, permitting the cylinder and plug to be urged by the resilient means back to their normal position, enabling the plug to be vertically lowered into and compressed within the pour bushing, to thereby scrape any residual foam from the inner surface of the pour bushing and to prevent chemicals from leaking into the annular sealed surface between the pour bushing and the plug during the reaction period.

REFERENCES:
patent: 3849074 (1974-11-01), Ficklinger et al.
patent: 4129636 (1978-12-01), Boden et al.
patent: 4141470 (1979-02-01), Schultz
patent: 4188356 (1980-02-01), Weber et al.
patent: 4314955 (1982-02-01), Boden et al.
patent: 4372352 (1983-02-01), Coppola et al.

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