Accumulator head having a piston with a self-wiping face

Abstract From the Canadian patent

Abstract of the Disclosure An accumulator head is decribed as having an annular accumulation chamber, an annular ring-piston movable axially through the chamber, an inlet through which plasticized resinous material is forced into the chamber between opposing ends thereof; and a special feature built into the ring-piston which causes material, flowing into the chamber to wipe the face or, tip of the piston and keep it clean and free of any material. A discharge passageway leads from the accumulation chamber to a discharge orifice adjacent which a parison is formed by resinous material from the chamber. Another inlet is provided in the discharge passageways as a means of providing a final …