초록 ▼

A method of making a retained tab for a container end and a design for same are disclosed. The tab opens in such a way that multiple forms of stress are induced in the tab before the tab will break away from the end. Specifically, the tab endures first a bending stress and then a torsional stress. T

A method of making a retained tab for a container end and a design for same are disclosed. The tab opens in such a way that multiple forms of stress are induced in the tab before the tab will break away from the end. Specifically, the tab endures first a bending stress and then a torsional stress. The mode of stress being defined by the construction of the tab.

대표청구항 ▼

An easy open closure for a container comprising: (a) a central panel wall including a peripheral flange for joining said closure to said container and an integral rivet; (b) a displaceable panel in said central panel wall disposed outwardly of said rivet and substantially defined by scoring; and (c)

An easy open closure for a container comprising: (a) a central panel wall including a peripheral flange for joining said closure to said container and an integral rivet; (b) a displaceable panel in said central panel wall disposed outwardly of said rivet and substantially defined by scoring; and (c) a lever tab with a tab nose and a tab lift and a central web disposed therebetween and wherein said tab web is lanced to form a tongue with said tongue joined to said central panel wall by means of said rivet and wherein a portion of said tongue is coined to a maximum depth on one side of said rivet and wherein other portions of said tongue substantially on the opposite side of said rivet being coining with graduated depth, whereby said tongue is urged to bend more sharply near said portion of graduated coining than said portion coined to a maximum depth when said tab is pivoted and breakage first occurs along said sharp bend causing thereafter twisting near said maximum coined portion.