Apparatus for blow molding hollow articles

Claim 1

APPARATUS FOR FORMING OPEN-ENDED HOLLOW ARTICLES FROM PLASTIC MATERIAL, SAID APPARATUS COMPRISING SEPARABLE MOLD MEANS INCLUDING A CAVITY HAVING A GENERALLY CYLINDRICAL OPEN END, EXTRUSION MEANS FOR SUPPLYING MATERIAL IN A PLASTIC STATE TO THE MOLD MEANS BY EXTRUDING A TUBE OF THE MATERIAL TO BE FORMED IN THE CAVITY, SAID EXTRUSION MEANS COMPRISING AN EXTRUSION MEMBER HAVING AN EXTRUSION ORIFICE THEREIN AND A COAXIAL EXTRUSION MANDREL, SAID MANDREL HAVING A CYLINDRICAL END PORTION MOVABLE AXIALLY INTO THE OPEN END PORTION OF THE CAVITY TO FORM A HOLLOW CYLINDRICAL MOLD SPACE, MEANS FOR CLOSING THE MOLD MEANS TO PINCH THE LOWER END OF SAID TUBE AT THE LOWER END OF SAID CAVITY, A SLEEVE MEMBER INDEPENDENTLY MOVABLE IN THE ANNULAR SPACE FORMED BY SAID EXTRUSION ORIFICE AND SAID EXTRUSION MANDREL AND INTO THE OUTER END OF SAID HOLLOW CYLINDRICAL MOLD SPACE TO FORM A NECK MOLD CAVITY WHEREIN THE OPEN END PORTION OF THE ARTICLE IS FORMED AT ITS END FACE BY SAID SLEEVE MEMBER, EXTERNALLY BY SAID CAVITY, AND INTERNALLY BY SAID EXTRUSION MANDREL.