Patent ID: 7255827
Filing Date: 2007-08-14
Classification: B29C

Abstract:
1. A blow cylinder for blow molding a container from a parison, comprising: a cylinder body having a head cavity at a first body end, a rod cavity at a second body end opposite said first body end, and a rod cavity wall; said rod cavity extending from said second body end to said rod cavity wall; an end cap attached to said cylinder body at said first body end; a piston assembly comprising a piston head, a piston rod, and a blow needle; said piston head connected to said piston rod; said piston rod connected to said blow needle; said piston rod slidable within said rod cavity; said piston head slidable within said head cavity; said piston head cooperating with said head cavity to define a head space between said piston head and said end cap and a heel space between said piston head and said rod cavity wall; an extend fluid port fluidly connected with said head space and fluidly connectable to a variable pressure fluid source for supplying an extend fluid; a retract fluid port fluidly connected with said heel space; and, a minimum pressure fluid source for supplying a retract fluid, fluidly connected to said retract fluid port.