Container and closure cap therefor

Claim 1

THE COMBINATION COMPRISING AN OPEN-MOUTH CONTAINER AND A SHEET METAL CLOSURE CAP FOR SEALING SAID CONTAINER, SAID CONTAINER HAVING A VERTICALLY DISPOSED NECK PORTION TERMINATING AT ITS UPPER END AND SEALING SURFACE COMPRISING A SUBSTANTIALLY FLAT TOP SEALING SURFACE, A VERTICALLY DISPOSED SIDE-SEALING SURFACE OF MINOR AXIAL EXTENT AND UPWARDLY SLOPING ANNULAR SEALING SURFACE BETWEEN SAID TOP AND SAID SIDE-SEALING SURFACE, SAID CLOSURE RETAINING MEANS BELOW SAID SIDE SEALING SURFACE, SAID CLOSURE CAP COMPRISING A CIRCULAR PANEL PORTION, A DEPENDING ATTACHING SKIRT AT THE PERIPHERY OF SAID PANEL PORTION, THE PANEL PORTION BEING DEFORMED IN AN AREA ADJACENT ITS POINT OF JUNCTURE WITH SAID SKIRT TO PROVIDE AN ANNULAR UPSTANDING HOLLOW RIB, SAID RIB HAVING RADIALLY SPACED INNER AND OUTER SIDE WALLS FORMING A SEALING GASKET ACCOMMODATING CHANNEL INTERNALLY OF THE PANEL PORTION, SAID OUTER WALL BEING DISPOSED AT APPROXIMATELY THE ANGLE OF SAID UPWARDLY SLOPING ANNULAR SEALING SURFACE, AN ANNULAR LEDGE BETWEEN SAID SKIRT AND RIB LYING IN A PLANE BELOW BUT PARALLEL WITH SAID PANEL PORTION, AN ANNULAR SEALING GASKET OF ELASTOMERIC MATERIAL DISPOSED IN SAID CHANNEL, THE OUTER PERIPHERY OF SAID GAKSET BEING SECURED TO THE INNER PERIPHERAL PORTION OF THE UNDERSIDE OF SAID LEDGE, SAID GASKET BEING HELD UNDER COMPRESSION BETWEEN SAID SEALING SURFACES AND SAID CAP WHEREBY SAID GASKET FORMS AROUND SAID SEALING SURFACE, AND MEANS ON THE LOWER PORTION OF SAID SKIRT COOPERATING WITH SAID CLOSURE RETAINING MEANS.