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Method and apparatus for individual control of injection mold shut-off bushings

  • US 4,279,582 A
  • Filed: 04/02/1979
  • Issued: 07/21/1981
  • Est. Priority Date: 04/02/1979
  • Status: Expired due to Term
First Claim
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1. In combination, a pair of mold dies movable between open and closed positions, a plurality of shut-off bushings carried by one of said mold dies, a material manifold having a single entry for connection to a molding machine and having passages leading to said shut-off bushings, a gate pin slidably mounted in each shut-off bushing, means responsive to closure of said mold dies to simultaneously move all said gate pins to their open position, individual motor means for advancing each pin to a closed position independently of the other pins, whereby material from said single source will be delivered to the remaining open gates, and means opening said molds after all gates have been closed, said motor means each comprising a hollow piston rod, said gate pin extending through said piston rod and being secured thereto at its rearward end, the remainder of said gate pin within said piston rod being spaced inwardly therefrom to provide a heat insulating gap which also accommodates relative lateral shifting between the gate pin and piston rod.

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