Plastic article or earthenware shaping or treating: apparatus – Means feeding fluent stock from plural sources to common...
Patent
1998-02-02
2000-03-28
Davis, Robert
Plastic article or earthenware shaping or treating: apparatus
Means feeding fluent stock from plural sources to common...
26432812, 264572, 425546, 425577, 425812, B29C 4517
Patent
active
060423544
ABSTRACT:
A gas injection apparatus for use with a gas assisted injection molding system. The gas injection apparatus includes a mold part defining an elongated bore communicating upstream with a source of gas and downstream with a mold cavity, and an elongated pin positioned in the bore and coacting with the bore to define a gas flow passage therebetween for movement of gas from the gas source to the mold cavity. The bore and pin include first, second and third corresponding portions. The pin and bore define an annular axial clearance in the first portion, a close fit with an axial linear passage in the second portion and an annular axial passage in the third portion. This arrangement ensures that the pin will remain concentric with respect to the bore so as to discourage entry of resin into the annular axial passage.
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