Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
March 16, 2010
Patent Application Number
11301075
Date Filed
December 12, 2005
Patent Primary Examiner
Patent abstract
A shut-off valve for preventing drool from an injection molding apparatus is provided in a melt channel of a sprue bushing. The shut-off valve includes a fixed member located in the melt channel and a reciprocating member coupled to the fixed member. The reciprocating member is biased toward an extended position in which an inlet of the sprue bushing is blocked thereby. The reciprocating member is movable from the extended position towards a retracted position in which the inlet of the sprue bushing is clear by the force of a melt stream entering the melt channel of the sprue bushing.
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