Patent ID: 8328492

Claim:
A method for forming an easy open can end member, comprising the steps of: forming a can end shell comprising: a central panel centered about a longitudinal axis, the central panel having a peripheral edge; a curl defining an outer perimeter of the end member; a circumferential chuckwall extending downwardly from the curl; and a transition wall connecting the chuckwall with the peripheral edge of the central panel; folding a downwardly extending portion of the chuckwall wall radially inwardly to form a folded portion extending inwardly relative to the longitudinal axis, which folded portion comprises a convex annular apex joining a first leg and a second leg, the first leg joining the transition wall with the chuckwall and the second leg joining the transition wall with the peripheral edge through a concave annular apex; preventing the folded portion from expanding radially inwardly by maintaining the folded portion in compression; and forcing the folded portion upwardly.