Closure cap for containers

Claim 1

In combination with a container, a closure cap for the opening of the neck of said container, said container having at least an upper portion of noncircular cross-sectional shape, said closure cap including sidewalls the circumferential shape of the lower edges of which corresponding to the cross-sectional shape of the upper container portion wherein the sidewalls of the container cap are aligned with the sidewalls of the container when the closure cap occupies its closing position, wherein the neck (6) of said container (1) extends upwardly from a shoulder (4) defined by the sidewalls (2) of said container and forming nonsquare edges (3) therewith said neck being provided with outer courses of thread (9), and that said closure cap (10) includes a central downwardly extending bottom open tubular socket (11) terminating with its opening above the plane of said lower edges (14) and being provided with inner courses of thread (15) adapted to engage said outer courses of thread of the container neck the pitch and the position of said courses of thread being such that the circumferential contour of said closure cap, when screwed onto the neck until its lower edges contact said shoulder of the container, will occupy an angular position relative to the crosssectional contour of said container and that continued rotation of said closure cap will cause a cam action between the lower edges of said closure cap and the rounded or beveled shoulder edges of said container and a deformation of the closure cap thereby storing a force which is utilized to snap and axially draw said closure cap into its closing position in which the outer contours of both said closure cap and said container are positively aligned and said container opening is firmly sealed.