Tire press center mechanism

Abstract

A center mechanism () for manipulating a bladder () in a tire curing press () includes a lower plate ring () for carrying a lower bead () of the bladder (), and an upper plate ring () for carrying an upper bead () of the bladder (). The center mechanism () may also include a first piston chamber () and a second piston chamber () positioned radially interior from the first piston chamber (). An outer piston assembly () is operative to selectively raise the lower plate ring () and an inner piston assembly () is positioned inside the outer piston assembly () and is operative to selectively raise the upper plate ring () relative to the lower plate ring (). A guide () is coupled to the outer piston assembly () and is adapted to slidingly contact the inner piston assembly () to prevent relative rotation therebetween. Operating fluid is provided through a single port () to selectively raise the outer piston assembly () and the inner piston assembly (). The port () is fluidly connected to the first chamber () and the second chamber ().