Tire valve core

Claim 2

In a tire valve core including a tubular barrel and an externally threaded head, the tubular barrel terminating at one extremity in an outwardly directed enlarged flange receivable within said 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 gasket receiving area formed on said tubular barrel substantially centrally of the length thereof, said gasket receiving area being bounded by substantially perpendicular wall portions formed on said barrel to define first and second shoulders spaced apart along the length of said barrel, and a gasket surrounding said barrel and received between said first and second shoulders; the improvement wherein said gasket receiving area of said barrel is defined by a first annular sealing surface, a second annular sealing surface of smaller diameter than the first sealing surface, a third annular sealing surface of smaller diameter than the second sealing surface, a first beveled transition area connecting said first and second sealing surfaces, and a second beveled transition area connecting said second and third sealing surfaces.

Claim 3

Apparatus as claimed in claim 1, in which said first sealing surface extends between one-fourth and one-third of the linear distance between said first and second shoulders, said second sealing surface extends for between three-quarters and one times the length of said first sealing surface, and said third sealing surface extends for between one-third and two-thirds of the length of said first sealing surface.

Claim 4

Apparatus as claimed in claim 1, in which said barrel is a drawn metal shell.

Claim 5

Apparatus as claimed in claim 1, in which said gasket is produced from fluorocarbon material.

Claim 6

In a tire valve assembly, a valve stem having a through bore with a tapered valve seat formed therein, a valve core including a tubular barrel and an externally threaded head attached to said barrel, a gasket receiving area formed on said tubular barrel substantially centrally of the length thereof, said gasket receiving area being bounded by substantially perpendicular wall portions formed on said barrel to define first and second shoulders spaced apart along the length of said barrel, a gasket surrounding said barrel and received between said first and second shoulders, and internal thread means formed in said valve stem to receive said externally threaded head, said gasket being placed in sealing engagement with said valve seat when said head is screwed into said stem; the improvement wherein the qasket receiving area of said barrel is defined by a first annular sealing surface at a first diameter, a second annular sealing surface at a second diameter smaller than the first diameter, and a third annular sealing surface at a third diameter smaller than the second diameter, said first and second sealing surfaces being connected by a first beveled transition area, and said second and third sealing surfaces being connected by a second beveled transition area.

Claim 7

In a tire valve assembly, a valve stem having a through bore with a tapered valve seat formed therein, a valve core including a tubular barrel and an externally threaded head attached to said barrel, a gasket receiving area formed on said tubular barrel substantially centrally of the length thereof, said gasket receiving area being bounded by substantially perpendicular wall portions formed on said barrel to define first and second shoulders spaced apart along the length of said barrel, a gasket surrounding said barrel and received between said first and second shoulders, and internal thread means formed in said valve stem to receive said externally threaded head, said gasket being placed in sealing engagement with said valve seat when said head is screwed into said stem; the improvement wherein the qasket receiving area of said barrel is defined by a first annular sealing surface at a first diameter, a second annular sealing surface at a second diameter smaller than the first diameter, and a third annular sealing surface at a third diameter smaller than the second diameter, said first and second sealing surfaces being connected by a first beveled transition area, and said second and third sealing surfaces being connected by a second beveled transition area.