Manufacture of hollow articles

Claim 2

APPARATUS FOR MANUFACTURING A HOLLOW ARTICLE, COMPRISING A PARISON-FORMING MOULD OPEN AT THE OPPOSITE ENDS THEREOF, A SECTIONAL BLOW-MOULD THE PARTS OF WHICH ARE MOVABLE TO AND FROM THE OPEN AND CLOSED POSITONS THEREOF AND WHICH IN THE CLOSED CONDITION THEREOF HAS AN ORIFICE IN THE END THEREOF ADJACENT TO THE PARISON-FORMING MOULD AND WHICH IS ALIGNED WITH THE PARISON-FORMING MOULD AND HAS A LESSER CROSS-SECTIONAL AREA THAN THAT OF THE SMALLEST CROSS-SECTIONAL DIMENSION OF THE PARISON-FORMING MOULD, AN APERTURED SHUTTER LOCATED BETWEEN AND MOVABLE RELATIVE TO THE PARISON-FORMING MOULD AND THE BLOW-MOULD AND OPERABLE IN TIMED RELATION WITH THE BLOWMOULD ALTERNATIVELY TO OBTURATE SAID ORIFICE AND TO EFFECT COMMUNICATION BETWEEN THE PARISON-FORMING MOULD AND THE BLOW-MOULD, A HOLLOW CORE CONNECTABLE WITH A SOURCE OF PRESSURISED FLUID AND RECIPROCABLE AXIALLY FROM A POSITION REMOTE FROM THE PARISON-FORMING MOULD IN TIMED RELATION WITH MOVEMENTS OF THE BLOW-MOULD AND SHUTTER, CORE-OPERATING MEANS CONNECTED WITH SAID CORE TO EFFECT AXIAL MOVEMENT THEREOF IN TWO STAGES FIRST TO PENETRATE A SLUG OF SOFTENED THERMOPLASTIC MATERIAL LOCATED IN THE PARISON-FORMING MOULD AND PRODUCE A CLOSED END PARISON SURROUNDING THE CORE AND THEN TO CO-OPERATE WITH SAID ORIFICE TO EXTRUDE DIRECTLY INTO THE BLOW-MOULD A CLOSED END PREFORM HAVING WALLS OF LESSER THICKNESS THAN THAT OF THE WALLS OF THE PARISON, MEANS TO ADMIT PRESSURISED FLUID THROUGH THE CORE INTO THE PLATFORM TO EXPAND THE PREFORM AND CONFORM IT TO THE SHAPE OF THE INTERIOR OF THE BLOWMOULD, AND MEANS TO RETAIN THE PARISON-FORMING MOULD, THE SHUTTER, AND THE BLOW-MOULD IN SUBSTANTIALLY AIRTIGHT RELATION DURING FORMATION OF THE PARISON AND PREFORM AND TO EFFECT RELATIVE AXIAL MOVEMENT BETWEEN THE PARISONFORMING MOULD AND THE BLOW-MOULD TO RELIEVE FLUID PRESSURE IN THE BLOW-MOULD PRIOR TO OPENING OF THE BLOWMOULD.