Extruder screw with right angle discharge

Claim 1

IN AN EXTRUSION DEVICE, THE COMBINATION COMPRISING: AN EXTRUSION CYLINDER HAVING A CENTRAL OPENING THEREIN, AN INLET OPENING ADJACENT ONE END THEREOF AND A SIDEWARDLY DIRECTED OUTLET OPENING ADJACENT THE OTHER END THEREOF; A ROTATABLE SCREW WITHIN SAID CENTRAL OPENING AND EXTENDING PAST SAID OUTLET OPENING, SAID SCREW BEING PROVIDED WITH AT LEAST ONE PROPELLING THREAD THEREON EXTENDING FROM SAID INLET OPENING TO A POINT SUBSTANTIALLY ADJACENT SAID OUTLET OPENING OF A DEPTH FOR CARRYING AND PROPELLING PLASTIC MATERIAL TO AND THROUGH SAID OUTLET OPENING AND BEING FURTHER PROVIDED FROM SAID OUTLET OPENING TO THE ADJACENT END OF SAID SCREW WITH A SHALLOW HELICAL GROOVE OF THE SAME HAND AS SAID THREAD AND COMPRISING AS AREA SUCH THAT THE REMAINING LANDS ARE SUFFICIENT TO PROVIDE BEARING SUPPORT FOR SAID GROOVE ARE SUFFICIENTLY RESTRICTED THAT ONLY A MINOR QUANTITY OF PLASTIC MATERIAL WILL BE PROPELLED THERETHROUGH; WHEREBY SAID MINOR QUANTITY OF PLASTIC MATERIAL PROPELLED THROUGH SAID GROOVE WILL ACT AS A LUBRICANT FOR THE BEARING PORTIONS THEREOF AND TO MAINTAIN THE INTERIOR OF SAID EXTRUSION CYLINDER FREE FROM CONTAMINATION.