Sprue ejector in automatic injection molding machines
OwnerHans Simoninventor
Life of this patent
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Abstract
An apparatus for removing the sprue from an injection mold, having a cylinder and an associated piston rod, in which the piston rod extends between the two halves of the mold into the runner when the injection mold is closed. Molding material is molded around the forward end of the piston rod during the injection. Upon opening of the mold the sprue fixedly carried by the forward end is removed by movement of the piston rod into the cylinder.
Claims12
In an injection molding machine having two mold halves and means for moving the mold halves relative to each other in an axial direction, an apparatus for removing a sprue from the molding machine, said apparatus comprising:
- a cylinder, an associated piston rod connected to said cylinder, said piston rod having a front end, means for extending the front end of the piston rod from the cylinder transversely to the axial direction and between said two mold halves into a space forming the sprue so that during injection molding material will be molded around the front end of said piston rod and form the sprue, and means for retracting the piston rod with the sprue, upon separation of the mold halves, into the cylinder and for separating the sprue from the front end of said piston rod.
Dependencies are inferred from the claim text.