Abstract: A blow molding method including a clamp for clamping two molds in back-to-back relationship, the clamp having first and second movable, inner platens supporting interior sections of two molds; first and second movable outer platens supporting exterior mold sections facing the interior sections; a positioner to move the inner and outer platens between opened and closed positions; an extrusion means to extrude parisons between mold sections, injectors to inject air into the interior of the parisons; and a platen retainer to resiliently position the inner platens between the outer platens to equalize pressure in the two molds.

Abstract: A blow molding apparatus including a clamp for clamping two molds in back-to-back relationship, the clamp having first and second movable, inner platens supporting interior sections of two molds; first and second movable outer platens supporting exterior mold sections facing the interior sections; a positioner to move the inner and outer platens between opened and closed positions; an extrusion means to extrude parisons between mold sections, injectors to inject air into the interior of the parisons; and a platen retainer to resiliently position the inner platens between the outer platens to equalize pressure in the two molds.

Abstract: In a soft-serve ice cream dispensing machine of the gravity feed type containing an overrun control device for controlling the amount of air ingested into the liquid mix while retaining the entrapped in a standby condition, the device including a tubular member with a longitudinal air passageway positioned with its lower end communicating between the mixing chamber and reservoir, its upper end extending above the fluid level in the reservoir, a mixing chamber within the device concentrically positioned in the air passageway with a plurality of lateral openings in the device extending into the mixing chamber allowing liquid mix to enter the mixing chamber and a venturi means in the air passageway downstream of the mixing chamber having a throat section and an air induction tube intersecting the throat section and extending above the level of the reservoir to permit additional air to be drawn into the air passageway due to the increased velocity in the throat area.

Abstract: This invention pertains to machines for freezing and dispensing a confectionery product, particularly soft ice cream and milk shakes. The invention is particularly addressed to an improved mix over-run control for controlling the flow of air and liquid product into the freezing chamber by directing the incoming fluid mix from a reservoir into a vortex chamber which causes the fluid mix to flow down the side walls of a communicating line with an open air passage in the center therefor for assuring the proper over-run or percentage of air in the resultant confectionery product.

Abstract: A valve for controlling the flow of air and liquid product mix from a liquid product reservoir to a freezing chamber in a soft ice cream dispensing machine has a lower tubular member snugly yet removably received within a tubular communicating line between the reservoir and freezing chamber. An air retaining chamber is fixed to the upper portion of the lower tubular member and communicates therewith. An upper tubular member fixed to the chamber extends upward to a point above the maximum anticipated level of the liquid product in the reservoir. The lower end of the upper tubular member extends somewhat inside the chamber. The upper tubular member has a small aperture near the lower end thereof opening into the liquid product reservoir. A checkvalve is attached to the lower end of the upper tubular member for retaining air in the air retaining and freezing chambers to assure the desired overrun in the ice cream.