A container and closure therefor comprises an open top or mouth container having a container wall provided with a circumferential shoulder close to the upper end of the wall, and a push-in cover member having a circumferential raised rim portion provided with a circumferential skirt member depending externally over the container wall. The skirt member has its inner wall surface provided with a projection which engages underneath said shoulder on the container wall when the cover member is pushed over the open top of the container. A circumferential notch on the outer side of the skirt member provides a weakening line permitting to tear off a lower portion of the skirt member provided with said projection when the container is to be opened, but leaving the remaining cover member intact to be reusable for closing the container. The cover has a bulged portion on the outer surface of the inner wall and there is a shaped contoured fit between the container and cover.

This invention concerns improvements in a plastic closure for a tight-head container having a protruding lip opening and adapted to hold a liquid under pressure wherein the closure includes a base, a generally cylindrically-shaped inner section or skirt adapted to fit into the container opening and a generally cylindrically-shaped outer rim section or skirt 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. The improvements include (1) a circumferential strengthening collar disposed on the outer portion of the outer rim section in the region of the rim opposite the closure base, (2) an outward taper of the inner surface of the outer rim section in the region of the collar and (3) a base which is concave in shape. Closure caps of the present invention provide an improved seal with glass bottles, reduce bottle breakage in the capping operation, and provide a ready indication if the bottles have been previously opened. (2)

A tamperproof lid for a container, in which a toothed ring portion must be substantially completely removed from its connection to the remainder of the lid and also from contact with the rim of the container in order to open the container, thus providing protection against tampering with the contents of the container. The lower portion of the lid outer periphery is provided with toothed or segmented sections extending around the circumference of the lid. Upon an attempt being made to raise the lid, the teeth will engage the lower surface of the container rim in a tight, firm construction which tends to hold more tightly as any attempt is made to remove the lid. Thus the lid of the invention may not be removed without destroying the seal which the lid makes with the rim of the container.

5-gallon plastic molded bottles of at least two manufacturers have neck profiles which differ slightly but have a diameter where the variation in profile is at a minimum. The cap of this invention fits at least two profiles. In each profile there is an outward-convex bead below the top lip. The interior of the skirt of the cap curves concave approximately co-extensive with such bead curvature and has plural circumferential internal annular ridges which engage the bead at about its maximum diameter. Below the ridges is an internal annular tension ring having a diameter when unstressed less than the diameter of the top neck bead at its circle of contact which engages below the maximum bead diameter and hence tends to pull the ridges down into tighter engagement with the profiles of either manufacturers' neck finish. Below the tension ring the skirt is formed with a horizontal tear line which extends about 265.degree. of the circumference of the skirt. A second score line curves down to the bottom edge of the skirt. A tear tab projects down adjacent the terminus of the curved score line. To properly seat the cap on the neck and to reduce resistance to the capping operation, narrow vertical internal ribs radially spaced apart are formed on the inner skirt slightly below the horizontal score line.

A self-retaining stopper for bottle containing pressurized contents such as champagne is disclosed. The stopper is especially adapted to cooperate with a bottle finish having a plurality of raised helical ribs of substantially uniform width and uniform maximum height spaced regularly around the circumference of the finish. The stopper comprises a shank for sealable insertion into the neck of such a bottle and a cup-shaped crown defining a resilient skirt overlying the finish. The skirt includes a plurality of inwardly projecting nodular protrusions for engaging the lower side of the helical ribs upon the inwardly directed urging of the resilient skirt. The inner wall of the skirt further includes a plurality of webs disposed to encounter the upper rim of the finish. The nodular protrusions and the webs are spaced apart a predetermined distance to secure the stopper in an axially locked position against the high pressures encountered within the bottle without the need for safety wiring or the like. The stopper permits axial insertion into and twistable removal from the neck of the container.