Patent ID: 6857291

Claim:
A blow mold assembly for an I.S. machine for blowing a parison of glass in a blow mold and cooling the blown parison into a formed bottle which can be removed from the blow mold comprising a blow head arm, at least one blow head supported by said blow head arm, each of said blow heads including an inlet for supplying air to the interior of a parison, displacement means for lowering said blow head arm from a retracted position to an “on” position whereat the blow head engages the top surface of a blow mold, for raising said blow head arm, at a predetermined time after the blow head engages the top surface of the blow mold a selected vertical distance above the top surface of the blow mold from said “on” position to an exhaust position to allow air to escape from the blow mold, said selected vertical distance being selected so that at least a minimum pressure will continue within the formed bottle, and for maintaining said blow head at said exhaust position for a selected time and then raising said blow head arm to the retracted position.