Container assembly having improved clamping ring

Claim 1

AN IMPROVED DRUM TYPE CONTAINER ASSEMBLY COMPRISING: A CONTAINER BODY HAVING AN OPEN END WITH A CHIME FORMED THEREAROUND AND ALSO HAVING A DOWNWARDLY FACING ROUNDED SHOULDER FORMED AROUND ITS EXTERIOR A SHORT DISTANCE BENEATH THE TOP OF THE CHIME TO PROVIDE A DOWNWARDLY FACING CAM SURFACE; A COVER REMOVABLY APPLIED TO THE OPEN END OF THE CONTAINER AND HAVING A PERIPHERAL FLANGE WITH AN UPWARDLY ROUNDED SHOULDER OVERLAPPING THE TOP OF THE CHIME AND FORMING AN UPWARDLY FACING CAM SURFACE; AND A SPLIT CLAMPING RING MADE OF A RESILIENT METAL ASSEMBLED AROUND SAID COMBINED CONTAINER CHIME AND COVER AND HAVING A LOCKING ASSEMBLY CONNECTED BETWEEN THE ADJACENT ENDS OF THE RING AND SHIFTABLE FROM AN OPEN POSITION WITH THE RING IN EXPANDED RELATION SO AS TO BE REMOVABLE FROM THE CHIME AND COVER TO A LOCKED POSITION WITH THE RING IN CONTRACTED RELATION TIGHTLY ENGAGING THE CHIME AND COVER, SAID RING BEING FORMED WITH A PERIPHERAL BAND PORTION AND HAVING INTEGRAL FLANGE PORTIONS EXTENDING FOR SUBSTANTIALLY THE ENTIRE LENGTH OF THE BAND AND PROJECTING RADIALLY INWARDLY TOWARD THE AXIAL CENTER OF THE BAND IN SLIGHTLY DIVERGING RELATIONSHIP WITH THE MARGINAL EDGES OF THE FLANGES BEING BENT BACK UPON THEMSELVES TOWARD THE INTERIOR SURFACES OF THE FLANGES TO FORM MARGINAL BEADS, THE LENGTH OF THE RESPECTIVE FLANGES BEING SUCH THAT THE BEADS EXTEND SLIGHTLY BEYOND THE APEX PORTIONS OF THE UPPER AND LOWER CAM SURFACES AND THE SPACING BETWEEN THE FLANGES IS SUCH THAT WHEN THE FLANGES ARE IN A POSITION OF REST THE DISTANCE BETWEEN THE BEADS IS SLIGHTLY LESS THAN THE DISTANCE BETWEEN THE APEX PORTIONS OF THE CAM SURFACES WHEREBY WHEN THE CLAMPING RING IS ASSEMBLED AROUND THE COMBINED CHIME AND COVER AND IS CONTRACTED BY THE LOCKING ASSEMBLY THE FLANGES ARE EXPANDED OVER THE CAM SURFACES WITH THE MARGINAL BEADS RETAINED BEYOND THE APEX PORTIONS IN COMPRESSIVE ENGAGEMENT WITH THE CAM SURFACES.