Measures to control opening of full-panel safety-edge, convenience- feature end closures

摘要

A full-open, disc-removal, convenience-feature end wall closure with raw edge metal protection and improved easy-open features includes a peripherally-located scoreline defining the disc to be removed, a back scoreline located within the disc and a longitudinally rigid (non- lanced) opener made integral with the disc by a rivet. A multi-layer fold of sheet metal contiguous to the peripheral scoreline shields residual scoreline metal which remains with the disc. The back scoreline includes a central vent portion and a pair of legs extending, one each from such central portion, on opposite sides of the rivet, toward the adjacent portion of the peripheral scoreline so that, after rupture of the vent portion of the back scoreline, rupture of the back scoreline legs tends to move the opener in a radial direction; radially-directed movement is controlled and the working end of the opener is turned inwardly, in relation to a container, and toward a prescribed location with respect to the peripheral scoreline so as to facilitate initial rupture. The remainder of the peripheral scoreline is severed by continuing arcuate movement of the handle end of the opener which places the handle end radially outboard of the container for lever action opening using the chime seam as a fulcrum.