Floating screw plasticizing cylinder

Claim 1

A FLOATING SCREW PLASTICIZING CYLINDER FOR USE IN A PLASTIC INJECTION MOLDING DEVICE COMPRISING: AN ELONGATED HOUSING MEANS HAVING AN AXIAL BORE; AN END STRUCTURE HAVING A REVERSE FLOW PASSAGE AND A DISCHARGE OPENING THEREIN; AN AXIALLY FIXED FREE ROTATING SCREW MOUNTED IN SAID END STRUCTURE AND IN A FIRST PORTION OF SAID BORE AND DEFINING WITH SAID FIRST PORTION A HELICAL PASSAGE IN COMMUNICATION WITH SAID DISCHARGE OPENING THROUGH SAID REVERSE FLOW PASSAGE; THE END OF SAID SCREW ADJACENT SAID END STRUCTURE DEFINING WITH A PORTION OF SAID REVERSE PASSAGE A BEARING RACE; BALL BEARINGS DISPOSED IN SAID RACE SUCH THAT FLOW OF FLUIDIZED PLASTIC THROUGH SAID REVERSE PASSAGE IS BETWEEN SAID BALLS; A GRANULAR MATERIAL RESERVOIR IN COMMUNICATION WITH A SECOND PORTION OF SAID AXIAL BORE AXIALLY REMOTE FROM SAID END STRUCTURE THROUGH AN APERTURE INTERMEDIATE THE ENDS THEREOF; A PLUNGER SLIDABLY MOUNTED IN SAID SECOND PORTION FOR DRIVEN RECIPROCATING MOVEMENT PAST SAID APERTURE SEQUENTIALLY TO OPEN SAID APERTURE AND INTRODUCE MATERIAL INTO SAID SECOND PORTION AND TO CLOSE SAID APERTURE AND COMPRESS SAID MATERIAL TO CREATE SUBSTANTIAL PRESSURE IN SAID PASSAGES AND THROUGH SAID DISCHARGE OPENING WHILE STIRRING SAID MATERIAL IN SAID PASSAGES WITH SAID FREE ROTATING SCREW AND SAID BALLS.