Nozzle assembly for injection molding

  • US 6,478,567 B1
  • Filed: 07/06/2000
  • Issued: 11/12/2002
  • Est. Priority Date: 02/19/1997
  • Status: Expired due to Term
First Claim
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1. A nozzle assembly for injecting molten plastic into a mold cavity, said nozzle assembly comprising:

  • a nozzle housing presenting a passage therethrough for receiving the molten plastic, said passage having a configuration to present a shoulder therein;

    a nozzle having a detachable threaded connection with said housing and a passageway communicating with said passage when the nozzle is connected with the housing, said nozzle having a discharge opening for injecting the molten plastic into the mold cavity;

    a shank portion of said nozzle having an outer end portion and an inner end portion providing said detachable connection of said nozzle with said housing;

    an enlarged flange on said shank portion of said nozzle at a location between said inner and outer end portions and adjacent to said shoulder;

    internal threads on said nozzle housing extending at a location spaced outwardly from said nozzle when the nozzle is connected to the housing; and

    a sleeve having a threaded connection with said internal threads on the nozzle housing and being adapted to be tightened on said internal threads to a position adjacent said flange to lock the nozzle to said nozzle housing, said sleeve fitting on said nozzle in a manner to present a gap between said sleeve and said shank portion along a majority of the length of said outer end portion of said shank portion.

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