In-mold gate opening and closing mechanism and metal mold for injection molding
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United States of America Patent
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-
Jan 13, 2004
Grant Date -
Jun 27, 2002
app pub date -
Dec 21, 2001
filing date -
Dec 22, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to an in-mold gate opening and closing mechanism in which it is easy to adjust the gate balance, more specially, in an in-mold gate opening and closing mechanism, in which a gate pin disposed in a gate in a mold is moved in line with resin pressure in the gate, the gate is opened by the gate pin escaping from the gate when the resin pressure exceeds an appointed pressure level when filling resin, and the gate is closed by the gate pin moving the gate direction when the resin pressure is lowered from the appointed pressure level when a filling of the resin is completed, wherein the gate is opened by a gate pin escaping from the gate when the resin pressure exceeds a pressing force of a spring adjusted by a mechanism for adjusting the spring pressure when filling resin.
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