Mold and vent plug therefor
AssigneeThe Goodyear Tire & Rubber Company
InventorsJames M. Dahl, Bernard B. Jacobs, Joseph E. Lipovac, Ralph A. Meglen, Donald W. Ward
Life of this patent
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Abstract
A mold for forming elastomeric articles and the like, has vent plugs inserted in bores through the body of the mold. The vent plugs may be manufactured of sintered metal. Each vent plug has a bore therethrough that is significantly smaller than the bore through the mold body, so that very little, if any, of the elastomeric substance being formed in the mold flows into the bore of the vent plug.
Claims16
A vent plug for a mold used in forming elastomeric articles and the like comprising an elongated body having an axis and first and second axial ends, the overall length of said body measured parallel to said axis being greater than any external diameter of said body measured perpendicular to said axis, said body having at said first axial end a first external diameter which is constant over a predetermined portion of the length of said body equal to not more than 50 percent of said overall length, said body along the remainder of its length having an external diameter that is less than said first external diameter, and an opening extending through said body from said first axial end to said second axial end.
A body for forming elastomeric articles and the like, said mold comprising an inner molding surface and an outer surface, said inner molding surface defining a cavity in which an article may be formed and communicating with said outer surface by means of a bore, said bore having a vent plug therein, said vent plug comprising:
- an elongated body having an axis and first and second axial ends, the overall length of said body measured parallel to said axis being greater than any external diameter of said body measured perpendicular to said axis, said body having at said first axial end a first external diameter which is constant over a predetermined portion of the length of said body equal to not more than 50 percent of said overall length, said first external diameter being sufficiently greater than the diameter of said bore so that said vent plug is press-fit into said bore, said body along the remainder of its length having an external diameter that is less than said first external diameter, and an opening extending through said body from said first axial end to said second axial end.
Dependencies are inferred from the claim text.