Hot passage manifold system
AssigneeIncoe Corporation
InventorKurt Gauler
Life of this patent
Estimating the term…
Abstract
A hot passage nozzle system including a manifold block, nozzle plate and one or more sprue bushings. At one end the sprue bushings are screwed into mating receptacles in the manifold block and centered at the exit openings of the material passageways in the block. The other ends of the sprue bushings are centered in the nozzle plate. The sprue bushings have annular grooves adjacent the connection with the manifold block creating points of flexure in order to accommodate dimensional changes due to temperature changes during use, and also to accommodate manufacturing tolerances.
Claims20
An improved hot passage manifold system for supplying molten material to injection molding molds, the system having a heated manifold block with at least one distribution passage, a nozzle plate, and at least one sprue bushing connected to the manifold block at a first end and positioned in a recess in the nozzle plate at a second end, said first end of said sprue bushing in communication with an exit opening of said at least one distribution passages, said improvement comprising:
- means for fixedly and sealingly connecting said sprue bushing to said manifold block at said first end;
- means for fixedly positioning said sprue bushing in said recess in said nozzle plate;
- and
- peripheral groove means on said sprue bushing between said first and second ends for allowing limited relative movement of said nozzle plate and manifold block.
A heated manifold system comprising:
- a manifold block having at least one distribution passageway therein, said passageway having an exit opening;
- a nozzle plate having a recess therein;
- a sprue bushing having a first end and a second end, said sprue bushing threadedly connected at said first end to said manifold block at said exit opening, said second end of said sprue bushing positioned in said recess in said nozzle plate;
- and
- peripheral groove means on said sprue bushing between said first and second ends for allowing limited relative movement between said first end and said second end in order to compensate for any manufacturing tolerances and to allow for expansion of said manifold block due to temperature changes.
A sprue bushing for use with a heated manifold system, said sprue bushing comprising:
- a body having a first end and a second end;
- thread means on said first end of said body for attaching said body to said manifold system;
- centering means on said second end of said body for centering the body with respect to a recess in a nozzle plate;
- peripheral groove means on said body between said first and second ends for allowing limited movement of said first end relative to said second end when each end is fixedly positioned.
Dependencies are inferred from the claim text.