Container and closure having integral sealing means

In a container structure including a substantially cylindrically shaped plastic container and closure member therefore wherein the container has adjacent its open end a rim portion provided with sealing means adapted to cooperate with complimentary sealing means on a rim portion of the closure member, the improvement wherein said rim portions comprise radially extending flanges and said sealing means on said closure member comprise said flange on the closure having a substantially inverted U-shaped cross-section with a radially extending base forming inner and outer walls facing each other and tapering outwardly from said base, two annular beads extending downwardly from said base spaced from said walls and each other, the sides of said beads tapering inwardly from said base, two complimentary annular grooves in the upper surface of the container flange having downwardly inwardly tapering sides to receive said beads in sealing engagement therewith, complimentary inner and outer tapering walls on said container flange corresponding to said inner and outer walls on said closure member to be received within said U-shaped cross-section of said closure member flange with said corresponding walls in cooperating sealing engagement, the angle of taper of said sides of said beads with respect to said base of the U being greater than the angle of taper of said sides of said grooves, and the width of each bead at said base being greater than the width of the open end of each respective groove, so that when said closure member is fitted onto said container there are six tightly sealing surfaces therebetween.