US 2005/0238758 A1Published application

Crossover nozzle system for stack molds

AssigneeInjectnotech Inc.

InventorsVince Ciccone, John Plut, Petrica Maran

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Abstract

A crossover nozzle system for transferring molten plastic from an inlet at the center of the stationary platen of an injection machine to the main manifold of the molding chambers of the stack molds of the injection molding machine. The nozzle system has a sprue bar, a sprue bar extension adjustably connected with the sprue bar, the sprue bar extension having a transfer chamber. The nozzle system also has symmetrically placed inlet apertures located in the sprue bar, the apertures are configured to be in fluid communication centrally with the transfer chamber in the sprue bar extension, and a shut-off surface configured to seal the transfer chamber from the inlet apertures.

Claims42

Dependent claims

A crossover nozzle system for transferring molten plastic from a feeder manifold to a main manifold of the molding chambers of the stack molds of an injection molding machine, wherein the centerline of the molding chambers coincides with the centerline of the stack molds, the system comprising:

a primary sprue bar in fluid communication with the feeder manifold;
an aperture in the primary sprue bar, the aperture in fluid communication with the feeder manifold;
a primary sprue bar extension adjustably connected with the primary sprue bar and an aperture in the primary sprue bar extension being in fluid communication with the aperture in the primary sprue bar;
a floating sprue connected with the primary sprue bar extension;
a primary sprue valve connected with the floating sprue and in fluid communication with the primary sprue bar extension;
a secondary sprue located in the main manifold and connected with the floating sprue;
a secondary sprue valve slidably located within the secondary sprue and in fluid communication with the primary sprue valve;
an extension rod connected with the secondary valve for activating the secondary sprue valve;
an extension rod activating cylinder having a piston connected with the extension rod;
and
an activating mechanism comprising a primary sprue valve activating cylinder which is coupled with the primary sprue valve and is configured for activating the primary sprue valve.

8 more elements

a primary sprue bar in fluid communication with the feeder manifold;
an aperture in the primary sprue bar, the aperture in fluid communication with the feeder manifold;
a primary sprue bar extension adjustably connected with the primary sprue bar and an aperture in the primary sprue bar extension being in fluid communication with the aperture in the primary sprue bar;
a transfer chamber in fluid communication with the aperture in the primary sprue bar extension, the transfer chamber formed between a back floating sprue and a front floating sprue;
a primary sprue shut-off valve centered and connected with the front floating sprue, wherein fluid communication is configured to allow the molten plastic to flow from the transfer chamber through one or more radial holes to a central hole in the body of primary sprue shut-off valve;
a secondary sprue shut-off insert having a central aperture, in fluid communication with the primary shut-off valve;
a secondary sprue surrounding the secondary sprue shut-off insert;
a valve stem slidably engaging the secondary sprue shut-off insert;
and
a valve stem activating cylinder having a piston which is coupled with the valve stem,
wherein the primary sprue bar, the primary sprue bar extension, the transfer chamber, the back floating sprue and the front floating sprue form parts of a primary side of the crossover nozzle system, and wherein the secondary sprue shut-off insert, and the secondary sprue forms parts of a secondary side of the crossover nozzle system.

8 more elements

Dependencies are inferred from the claim text.