Method and apparatus for multiple blow molding with rotary turntable

Claim 1

A blow molding apparatus comprising a rotary indexing turntable, means to rotatably index the turntable to a predetermined number of circumferentially spaced stations, said turntable having at least one partible mold mounted therewith for each of the circumferentially spaced stations, means to provide opened molds at at least first and second of said spaced stations, means to form a first parison to be operatively positioned at said first station and to form a second parison to be operatively positioned at said second station circumferentially spaced from said first station, means to position said first parison and means to position said second parison between the parted sections of each of the respective molds at the respective first and second stations, means to close said opened molds on said positioned parisons at the respective first and second stations, said each of said means to close said partible molds comprises switch means mounted on said apparatus so as to be actuated by the positioning movement of said positioning means, said switch means in turn actuating means interconnecting parted sections of the opened mold so as to close the mold along a line coincident with the axis of the positioned parison, means to introduce air under pressure to the interior of each of the respective parisons to expand the parisons to conform to the interior of the respective molds so as to form hollow object therein, means to cool each of said objects during rotation of the turntable and circumferential transfer of the molds from at least said respective first and second stations, and means for removing the formed objects from the opened molds at at least said first and second stations so as to permit other parisons to be positioned therebetween.