Method and apparatus for making a blown plastic article

Claim 1

APPARATUS FOR MAKING A PARISON OF PLASTICIZED MATERIAL INCLUDING IN COMBINATION, A PARISON MOLD ENCLOSING A MOLD CAVITY AND OPEN AT OPPOSITE ENDS THEREOF, A PARISON CORE PROJECTING FREELY THROUGH ONE END OF SAID PARISON MOLD AND TERMINATING AT A FREE END ADJACENT THE OTHER END OF SAID PARISON MOLD, SAID PARISON MOLD AND SAID PARISON CORE DEFINING AN ANNULAR MOLD SPACE THEREBETWEEN, AN END MOLD STRUCTURE SUBSTANTIALLY CLOSING SAID OTHER OPEN END OF SAID PARISON MOLD AND HAVING AN ORIFICE COMMUNICATING WITH SAID ANNULAR MOLD SPACE THROUGH WHICH PLASTICIZED MATERIAL MAY BE INJECTED INTO SAID ANNULAR MOLD SPACE, SAID FREE END OF SAID PARISON CORE HAVING A CONVEX SURFACE AND SAID END MOLD STRUCTURE HAVING A CONCAVE SURFACE AT SAID ORIFICE CONFRONTING SAID CONVEX SURFACE, ONE OF SAID SURFACES HAVING A RECESSED PORTION FOR ACCOMMODATING FLOW OF PLASTICIZED MATERIAL FROM SAID ORIFICE THROUGH SAID RECESSED PORTION TO SAID ANNULAR SPACE WHEN SAID CONVEX AND CONCAVE SURFACES ARE IN CONTACT WITH EACH OTHER, SAID END MOLD STRUCTURE BEING SUPPORTED AND HELD STATIONARY, SAID PARISON CORE BEING AXIALLY MOV-