Gas cap

Claim 2

A self closing gas cap removeably secured to a gas filler tube comprising: a cylindrical shaped body having a central passage formed therethrough; a door having a smooth, convex, continuous upper surface; means pivotally securing said door to said body adjacent said passage such that said door is moveable from a first position across the upper end of said central passage to a second position substantially aligned with the wall of said central passage; spring means secured to said body and to said door to urge said door upwardly; a resilient sealing gasket positioned over one end of said body and said door, said gasket having a passage formed centrally therein such that the inner edge of said passage in the gasket engages the upper surface of the door to form a seal therewith and limit upward movement of the door, a portion of the convex upper surface of said door extending through the passage in the gasket; cap means having a passage formed centrally therethrough and aligned with the passage in the gasket, said passage through the gasket being smaller than the passage through the cap such that the convex upper surface on said door deflects said gasket into the opening through said cap; means securing said cap means above the gasket and door to secure the gasket to the body to aid the gasket in limiting upward movement of the door.

Claim 3

The combination called for in claim 1 wherein the means pivotally securing said door comprises: a lug secured to the door, said lug having an aperture formed therethrough; and a pin journalled through said body and the aperture in the lug.

Claim 4

The combination called for in claim 2 wherein the means to urge said door upwardly comprises: a wire spring, opposite ends of said spring being spirally twisted about said pin adjacent opposite sides of said lug and secured in the upper portion of said body, the central portion of said spring being positioned to engage the lower surface of the door.

Claim 5

The combination called for in claim 1 wherein the cylindrical shaped body has threads formed on the exterior portion thereof for securing the cap to the filler tube.

Claim 6

The combination called for in claim 1 with the addition of: a dust ring secured about the upper portion of the body and secured to said cap means; and a resilient seal ring secured between the dust ring and body, said seal ring adapted to seal against the upper surface of the filler neck.

Claim 7

A self closing gas cap removeably secured to a gas filler tube comprising: a cap cover having a passage formed centrally therethrough, said cover having deflected edges formed about the periphery thereof; a gasket having a passage formed centrally therethrough said passage having a diameter smaller than the diameter of the passage formed in said cap cover, said gasket being secured adjacent said cap cover such that the passages are aligned; a door having a convex, upper surface; a cylindrical shaped body having a bore formed centrally therethrough, said body having an upper first shoulder formed about the periphery of one end and a second shoulder formed immediately adjacent said first shoulder, vent passages formed through said second shoulder communicating with the upper end of said bore in said cylindrical body; a ring shaped gasket engaging said second shoulder in position to engage the upper surface of the filler tube whenever the cap is secured to the filler tube; a dust ring having a deflected edge to engage the deflected edge of the cap cover, said dust ring being secured about the first shoulder on said cylindrical body to form a passage communicating downwardly from the second shoulder; a lug formed on said door having an aperture formed therethrough; a pin passing through said body and said aperture in said lug; a wire spring having opposite ends spirally twisted about said pin adjacent opposite sides of said lug and secured to the upper portion of said body, a central portion of said spring being positioned to engage the lower surface of said door to urge said door upwardly through the passage formed in said gasket and deflecting said gasket upwardly through the passage formed in said cap cover to form a substantially smooth surface across said cover.

Claim 8

A self closing gas cap removeably secured to a gas filler tube comprising: a cap cover having a passage formed centrally therethrough, said cover having deflected edges formed about the periphery thereof; a gasket having a passage formed centrally therethrough said passage having a diameter smaller than the diameter of the passage formed in said cap cover, said gasket being secured adjacent said cap cover such that the passages are aligned; a door having a convex, upper surface; a cylindrical shaped body having a bore formed centrally therethrough, said body having an upper first shoulder formed about the periphery of one end and a second shoulder formed immediately adjacent said first shoulder, vent passages formed through said second shoulder communicating with the upper end of said bore in said cylindrical body; a ring shaped gasket engaging said second shoulder in position to engage the upper surface of the filler tube whenever the cap is secured to the filler tube; a dust ring having a deflected edge to engage the deflected edge of the cap cover, said dust ring being secured about the first shoulder on said cylindrical body to form a passage communicating downwardly from the second shoulder; a lug formed on said door having an aperture formed therethrough; a pin passing through said body and said aperture in said lug; a wire spring having opposite ends spirally twisted about said pin adjacent opposite sides of said lug and secured to the upper portion of said body, a central portion of said spring being positioned to engage the lower surface of said door to urge said door upwardly through the passage formed in said gasket and deflecting said gasket upwardly through the passage formed in said cap cover to form a substantially smooth surface across said cover.