Seal for aerosol container including flexible gasket permitting filling of container through seal

Claim 1

A seal for an aerosol container, the container comprising: a cap with a central aperture therein; a tubular stem passed with clearance through said aperture; a gasket of resiliently deformable material which closely fits around said stem, is an interference fit within said cap and the outer surface of which engages the inner surface of the container cap throughout an annular contact zone surrounding said tubular stem; a flange provided on said stem for engagement with the opposite inner surface of said gasket; a shell within said container; and resilient means accommodated within said shell which yieldingly urge the flange towards said gasket, the shell having an open end surrounded by a rim which faces the inner side of the gasket the peripheral zone of which overlies said rim throughout its circumference, the seal being characterized in that the outer gasket surface is provided with a number of substantially groovelike recesses which are continued across the circumferential edge of the gasket right to the inner gasket surface, and in that the radially inner ends of said groovelike recesses are interconnected by an annular groove provided in the outer gasket surface between the radially inner ends of said groovelike recesses and said annular contact zone.