Tire valve core

Claim 1

In a tire valve core including a tubular barrel and an externally threaded machined head, the tubular barrel terminating at one extremity in an outwardly directed enlarged flange receivable within said machined head and said head being provided with a relatively thin annular wall portion terminating in an inwardly directed extremity to insure retention therein of the annular flange on said tubular barrel, a plastic gasket surrounding said barrel substantially centrally of the length thereof, and valve means extending through said tubular barrel and machined head; the improvement which includes a peripheral bead formed on said barrel, the inner face of said bead being constituted by a substantially perpendicular wall portion creating a sharply defined shoulder at the point of juncture with the outer surface of said barrel, said barrel further being provided with a slightly enlarged annular rib having an inwardly tapered outer surface and providing a sharply defined shoulder at the point of juncture with said barrel, said rib being spaced from said peripheral bead to provide a gasket seat therebetween the extent of said seat being determined by the opposed sharply defined shoulders on said peripheral bead and enlarged annular rib, said gasket seat being provided with a plurality of parallel annular grooves spaced inwardly from the shoulder on said annular rib and extending inwardly from the shoulder on said enlarged annular rib over approximately 50% of the width of said gasket seat, the material of said plastic gasket progressively entering into said spaced annular grooves when said valve core is positioned within a valve stem, said gasket seat also including an inwardly tapered portion beyond the grooved portion thereof said inwardly tapered portion extending from adjacent the groove farthest removed from the shoulder on the annular rib to the bottom of the perpendicular wall portion on the peripheral bead.