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Fluid pressure operated apparatus for mounting a differential pressure mold on a platen

  • US 4,969,812 A
  • Filed: 05/30/1989
  • Issued: 11/13/1990
  • Est. Priority Date: 05/30/1989
  • Status: Expired due to Fees
First Claim
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1. Apparatus for differential pressure forming thermoplastic objects from at least one thermoplastic sheet comprising:

  • a frame;

    means for supporting a thermoplastic sheet on said frame at a forming station;

    a pair of opposed, cooperating mold means for engaging opposite sides of said sheet to differentially pressure form an object in said sheet;

    means for relatively moving said mold means between spaced apart, open positions removed from said sheet and closed positions engaging opposite sides of said sheet;

    one of said mold means includinga platen;

    a mold member;

    means mounting said mold member in spaced relation with said platen for movement therewith and for movement relative thereto between a non-sealing position and a sheet sealing position comprising;

    a gap defined by opposing portions of said mold member and said platen;

    at least one separator plate disposed in said gap between said opposing portions of said mold member and said platen;

    a first endless yieldable seal means sandwiched between said opposing portions of said mold member and one side of said separator plate, to define an air pressure cavity on one side of said separator plate;

    a second endless yieldable seal means sandwiched between said opposing portion of said platen and the opposite side of said separator plate to define a second air pressure cavity on said opposite side of said separator plate; and

    fluid actuated means for incrementally moving said mold member relative to said platen from said non-sealing position toward said sheet to said sealing position to tightly sandwich said sheet between said pair of mold means and insure sealing engagement between said pair of mold means and opposite sides of said sheet comprising;

    means for admitting fluid under pressure to each of said cavities to move said mold member relative to said platen from said non-sealing position to said sealing position.

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