Pneumatic actuating mechanism for injection molding
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United States of America Patent
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-
Jun 11, 1991
Grant Date -
N/A
app pub date -
Aug 29, 1989
filing date -
Jul 14, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A multi-cavity valve gates injection molding system. The pneumatic actuating mechanism to reciprocate each elongated valve member includes a piston which reciprocates in a cylindrical opening through a cylinder plate. A sealing bushing which is mounted around each valve member has a flanged portion which bridges an insulative air gap between the manifold and the cylinder plate. Thus, the sealing bushing forms part of the piston cylinder as well as sealing against melt leakage around the reciprocating valve member. The piston has a circumferential outer band formed of a graphite alloy seated in a groove formed between a front portion and a removable rear plate portion.
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