Bi-directional check ring for a two-stage injection unit
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United States of America Patent
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-
Mar 13, 2001
Grant Date -
N/A
app pub date -
Feb 26, 1999
filing date -
Feb 26, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention is directed to a bi-directional check ring for a two-stage injection unit. More specifically, a close fitting ring is inserted behind the plunger head of the melt accumulator so that normal running clearances between the plunger and barrel bore can be used. The outer diameter of this check ring has a very close fit with the inner diameter the injection barrel, but is not rigidly connected to the plunger. Accordingly, the plunger is free to 'floats' while injection and plastication/filling take place. The open volume between the ring and plunger is small, but sufficient to permit the ring to 'float' very close to the barrel inner diameter, without being influenced by the alignment of the plunger and injection drive motor.
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