Injection molding apparatus

  • US 3,153,815 A
  • Filed: 10/28/1963
  • Issued: 10/27/1964
  • Est. Priority Date: 02/19/1960
  • Status: Expired due to Term
First Claim
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1. AN INJECTION APPARATUS FOR THE INJECTION MOLDING OF THERMOSETTING MATERIALS COMPRISING A HOLLOW CYLINDER ADAPTED TO CONTAIN THE MOLDING MATERIAL, A NOZZLE DISPOSED AT ONE END OF THE CYLINDER IN COMMUNICATION THEREWITH, A PISTON DISPOSED FOR RECIPROCABLE MOVEMENT WITHIN SAID CYLINDER AND ADAPTED TO FORCE SAID MATERIAL FROM THE CYLINDER THROUGH SAID NOZZLE AT A SUBSTANTIAL EJECTION PRESSURE, SAID PISTON BEING MOUNTED COAXIAL WITH SAID CYLINDER AND OF A DIAMETER SMALLER THAN THE INNER DIAMETER OF THE CYLINDER, AND SEALING MEANS SECURED TO THE PISTON AT THE FORWARD END THEREOF, SAID SEALING MEANS COMPRISING AN INTEGRAL ANNULAR MEMBER HAVING A CYLINDRICAL BODY TERMINATING AT ITS FORWARD END IN OUTWARDLY FLARED FLANGE, THE CYLINDRICAL BODY HAVING AN OUTER DIAMETER SUBSTANTIALLY LESS THAN THE INNER DIAMETER OF THE CYLINDER TO BE SPACED THEREFROM, THE FLARED FLANGE BEING TAPERED FROM ITS CONNECTION WITH THE MEMBER TO A NARROW CIRCUMFERENTIAL BLADE EDGE OF DIAMETER MAKING TIGHT ENGAGEMENT WITH THE INNER WALL OF THE CYLINDER ON A SUBSTANTIALLY LINE CONTACT, THE ANGLE BETWEEN THE OUTER SURFACE OF THE FLARE FLANGE AND THE CYLINDRICAL BODY SURFACE BEING SLIGHTLY LESS THAN 180* AND THE ANGLE BETWEEN THE LEADING INNER SURFACE OF THE FLARED FLANGE AND A PLANE NORMAL TO THE AXIS OF THE CYLINDER BEING RELATIVELY SMALL TO PROVIDE A STUBBY TAPER AND HENCE SUBSTANTIAL STRENGTH TO SAID FLANGE.

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