Tightly sealing safety cap

Claim 1

In a combination container and safety type cap therefor, the container including an open end portion defining a mouth and having a peripheral flange thereon, at least one segment of which is discontinuous, said cap including a generally planar end wall, a cylindrical side wall, and a plurality of inwardly facing projections selectively engaging said peripheral flange when said cap is in engaged condition upon said container, improved sealing means comprising: said container defining an inner substantially cylindrical surface in an area adjacent said mouth; said end wall of said cap having an inner surface and an annular inwardly directed sealing flange extending laterally from said inner surface; said flange having an effective radial thickness substantially greater than the thickness of said end wall, and an effective outer diameter slightly greater than the effective internal diameter of said cylindrical inner surface; said flange including an angularly disposed end surface forming camming means relative to said mouth; whereby, upon the closing of said cap upon said container, said flange contacts said opened end portion thereof to cam said flange within said mouth and centripetally compress said flange to a degree wherein the effective outer diameter thereof corresponds to the diameter of said inner cylindrical surface of said container, distortion of said flange being transmitted to said end wall of said cap to resiliently bow the same outwardly relative to said container.