Molding apparatus

Claim 1

APPARATUS FOR MOLDING ARTICLES OF AN EXTRUDABLE MATERIAL COMPRISING IN COMBINATION AN EXTRUDING DIE HAVING A FACE PROVIDED WITH AN OUTLET OPENING, A SUPPORT MEMBER BENEATH AND SPACED FROM SAID FACE, A MOLD MEMBER HAVING FIRST AND SECOND SURFACES AND BEING PROVIDED WITH A MOLD BORE EXTENDING THERETHROUGH FROM SAID FIRST SURFACE TO SAID SECOND SURFACE, SAID MOLD MEMBER HAVING SAID FIRST SURFACE IN SLIDING CONTACT WITH SAID DIE FACE AND SAID SECOND SURFACE IN SLIDING CONTACT WITH SAID SUPPORT MEMBER, SAID MOLD MEMBER BEING MOVABLE BETWEEN A FIRST POSITION WHEREIN SAID BORE IS BETWEEN SAID DIE FACE AND SAID SUPPORT MEMBER AND IS IN ALIGMENT WITH SAID DIE OPENING TO ALLOW MATERIAL TO FILL SAID BORE AND A SECOND POSITION WHEREIN SAID BORE IS DISPOSED OUTWARDLY OF SAID DIE FACE AND SAID SUPPORT MEMBER, A SOURCE OF AIR UNDER PRESSURE, AND MEANS FOR REMOVING SAID MATERIAL FROM SAID BORE WHEN SAID MOLD MEMBER IS IN SAID SECOND POSITION INCLUDNG A RECIPROCATING PISTON ADJACENT SAID MOLD MEMBER HAVING AN END FACE PROVIDED WITH AN AIR PASSAGEWAY THERETHROUGH AND BEING OPERATED IN ONE DIRECTION BY AIR UNDER PRESSURE FROM SAID SOURCE AND INCLUDING MEANS FOR SLIDABLY MOUNTING SAID PISTON TO MOVE SAID END FACE INTO CONTACT WITH SAID ONE OF SURFACES OF SAID MOLD MEMBER AND SAID PASSAGEWAY IN REGISTRY WITH SAID BORE WHEN SAID PISTON IS PRESSURIZED WHEREBY AIR FLOWS THROUGH SAID PASSAGEWAY TO EJECT SAID MATERIAL FROM SAID BORE AND INCLUDING A RETURN SPRING FOR SAID PISTON FOR OPERATING THE SAME IN THE OTHER DIRECTION.