Plastic article or earthenware shaping or treating: apparatus – Means feeding fluent stock from plural sources to common...
Patent
1998-04-14
2000-03-28
Davis, Robert
Plastic article or earthenware shaping or treating: apparatus
Means feeding fluent stock from plural sources to common...
264572, 425444, 425556, B29C 4540, B29C 4500
Patent
active
060423560
ABSTRACT:
A mold for use in a gas-assisted injection molding system includes an ejector pin subsystem including a blocking pin assembly which not only blocks the flow of molten plastic through a secondary runner but also helps to eject solid plastic from the mold. The mold also includes an adjustable overflow pin assembly and a conically-shaped spill cavity flow-coupled by the secondary runner to an article-defining cavity of the mold. The blocking pin assembly together with the adjustable overflow pin assembly are mounted on an ejector plate to move therewith between extended and retracted positions of the ejector plate. The blocking pin assembly includes a blocking pin which is slidably fit within a mold half to move between an extended blocking position to block the flow of molten plastic through the secondary runner and a retracted position to allow the flow of molten plastic through the secondary runner and into the spill cavity. The blocking pin assembly includes a hydraulic cylinder for slidably mounting and moving the blocking pin relative to the ejector plate. The blocking pin has an end surface which partially defines the secondary runner in its retracted position and partially defines the article-defining cavity in its extended blocking position. The adjustable overflow pin assembly and the blocking pin assembly, as well as the other ejector pins mounted on the ejector plate, eject plastic from the article-defining cavity, the spill cavity, and the secondary runner in the extended position of the ejector plate.
REFERENCES:
patent: 4734027 (1988-03-01), Adams
patent: 5090886 (1992-02-01), Jaroschek
patent: 5098637 (1992-03-01), Hendry
patent: 5423667 (1995-06-01), Jaroschek
patent: 5484278 (1996-01-01), Berdan
patent: 5607640 (1997-03-01), Hendry
patent: 5885518 (1999-03-01), Hendry
Davis Robert
Winget Larry J.
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