Patent ID: 7891519
Filing Date: 2011-02-22
Classification: B65D

Abstract:
1. An easy open can lid, comprising: an approximately disc-shaped panel portion integral with a flange portion fixing a can trunk formed on an outer circumference of the panel portion; a score line as a groove, the groove having a section which is substantially V-shaped, the score line formed near and along the outer circumference of the panel portion, the score line formed of an arcuate around a periphery of the panel portion, and both ends of the score line being separated; an opening piece defined by the score line which is no less than 50 percent and no more than 99 percent of the panel portion; an opening tab fixed near the periphery of the opening piece; a connecting portion, which is formed between the both ends of the score line, for connecting the opening piece with a periphery of the panel portion; a strength incrementing portion of the score line, which increases a rupture resistance gradually toward the both ends of the score line by increasing both of a thickness of the metal sheet underneath the panel portion and a width of the score line gradually toward the both ends of the score line within a predetermined range near the connecting portion; an annular rim, as an outer circumference of the panel portion, formed integral with the flange portion; and a folded portion forming three layers, which is formed on at least one of an inner end of the annular rim and an outer end of the panel portion by folding the inner end of the annular rim or the outer end of the panel portion into three layers, the score line being formed on the folded portion such that the score line ruptures in response to a force applied to the folded portion.