Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With means between charger and mold to cut off flow of...
Patent
1993-06-30
1995-03-28
Heitbrink, Jill L.
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With means between charger and mold to cut off flow of...
425564, 425DIG224, B29C 4552
Patent
active
054011612
ABSTRACT:
An injection molding ring valve assembly, having a concentrically disposed axially translatable center valve body member which when in a first axial position allows mass flow through the valve assembly and a separate front valve seat member in the shape of a torus in cooperation with a check ring, thereby providing smooth and unrestricted annular flow through the valve assembly during the priming process of the injection sequence. The check ring, formed from a cylindrical outer ring disposed about the center valve body member, sealingly engages an outer valve seat portion of the torus or front valve seat member. The torus further includes a center hub portion and at least one radially projecting web portion connecting the hub portion and the annular outer portion, resulting in one or more substantially axial semi-annular openings for the smooth and unrestricted passage of molding material.
REFERENCES:
patent: 4643665 (1987-02-01), Zeiger
patent: 5044926 (1991-09-01), Dinerman et al.
"Datum Tool Injection Head" dist. by CAC Tool, Witchita, KS.
"Mallard Non-Return Valve" Zeiger Indust., Canton, OH.
"4 Piece Ring Valve" EMI Corp., Jackson Center, OH.
"Chief II Mixing Screw" CAC Tool, Wichita, KS.
"Barrier Screw" CAC Tool, Witchita, KS.
"SPI Machinery Component Third Draft Proposal" Fall, 1989.
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