Closure cap for a container having a protruding rim opening

Claim 1

An assembly of (1) a tight-head glass bottle container having a protruding lip opening and adapted to hold a liquid under pressure, said protruding lip having a rounded outer contour, and (2) a plastic closure for said container comprising a base having a concave shape, a generally cylindrically-shaped hollow inner section adapted to fit into the container opening and having a diameter larger than the diameter of said container opening, the outer surface of said inner section being convex in contour, and a generally cylindrically-shaped outer rim section having an annular, flexible support lip adapted to enclose the outer surface of the container opening and to engage the protruding lip of the container, said outer rim section having a circumferential collar disposed on the outer portion thereof in the region of the rim opposite said base, the apex of the convex contour of said inner section being disposed at a point closer to said base than the location of the support lip of the outer rim section, the closure and collar thereof being constructed of a flexible, resilient plastic and said outer rim section being tapered outwardly in the region of said collar to form a pointed edge at its end opposite said base whereby said pointed rim discourages people from trying to remove by hand said closure from said container and whereby removal of said closure from said container by means of a bottle opener leaves indentations indicating that said container has been opened.