Manufacture of plastic articles

Claim 1

A MACHINE FOR FORMING HOLLOW ARTICLES OF PLASTIC MATERIAL COMPRISING, IN COMBINATION, SUPPORT MEANS; EXTRUSION MEANS MOUNTED ON SAID SUPPORT MEANS AND INCLUDING AN EXTRUSION DIE HAVING A SUBSTANTIALLY VERTICAL AXIS FOR EXTRUDING A PLASTIC TUBE IN UPWARD DIRECTION; A PAIR OF COMPLEMENTARY MOLD HALVES MOUNTED ON SAID SUPPORT MEANS MOVABLE IN DIRECTION TRANSVERSE TO SAID AXIS BETWEEN AN OPEN AND CLOSED POSITION; A BLOW NOZZLE HAVING AN OUTER DIAMETER EQUAL TO THE INNER DIAMETER OF A NECK OF THE ARTICLE TO BE FORMED, SAID BLOW NOZZLE BEING ARRANGED CONCENTRIC WITH SAID AXIS AND BEING MOVABLE BETWEEN A LOWERED POSITION ABUTTING AGAINST SAID EXTRUSION DIE AND A RAISED POSITION; A TRAVERSE CONNECTED TO SAID BLOW NOZZLE FOR MOVEMENT THEREWITH AND EXTENDING TRANSVERSELY TO THE DIRECTION OF MOVEMENT OF SAID MOLD HALVES SO AS TO BE MOVABLE THEREBETWEEN WHEN THE LATTER ARE IN SAID OPEN POSITION; A PAIR OF COMPLEMENTARY RING HALVES SURROUNDING SAID BLOW NOZZLE AND HAVING INNER SURFACES CORRESPONDING TO THE OUTER SURFACE OF SAID NECK, SAID RING HALVES BEING MOVABLE IN DIRECTION OF SAID TRAVERSE BETWEEN AN OPEN AND A CLOSED POSITION; A PAIR OF MOVING MEANS RESPECTIVELY MOUNTED ON OPPOSITE ENDS OF SAID TRAVERSE AND OPERATIVELY CONNECTED TO SAID RING HALVES FOR MOVING THE SAME BETWEEN SAID POSITIONS THEREOF; SECOND MOVING MEANS MOUNTED ON SAID SUPPORT MEANS AND OPERATIVELY CONNECTED TO SAID BLOW NOZZLE FOR MOVING THE SAME AND SAID TRAVERSE CONNECTED THERETO BETWEEN SAID LOWERED AND SAID RAISED POSITIONS; AND THIRD MOVING MEANS OPERATIVELY CONNECTED TO SAID MOLD HALVES FOR MOVING THE SAME BETWEEN SAID POSITIONS THEREOF.