Safe container end closure and method for fabricating a safe container end closure

Method of fabricating a safe container end closure comprising:

• positioning a shell in a fabricating machine, the shell including a bottom wall and a sidewall extending upwardly from the bottom wall;
• forming first and second folds in the sidewall of the shell, the first fold opening inwardly and the second fold opening outwardly;
• pressing a V-shaped die element with a rounded nose against the sidewall of the shell at a place on the sidewall located radially inwardly of the radially outermost extent of the first fold and positioning a rounded anvil on a surface of the sidewall of the lid that is opposite to a surface against which the V-shaped die is pressed to form in the sidewall a V-shaped score line having a rounded nose, the V-shaped score line dividing the sidewall of the shell into a central lid portion positioned on an inner side of the score line and a peripheral lid portion positioned on an outer side of the score line, the V-shaped score line permitting the central lid portion to be severed from the peripheral lid portion;
• and
• securing an opening tab to the bottom wall of the shell so that a nose of the opening tab is positioned adjacent the score line.

Method of fabricating a safe container end closure, comprising:

• positioning in a fabricating machine a shell that includes a bottom wall and a sidewall extending upwardly from the bottom wall;
• forming first and second folds in the sidewall of the shell, the first fold opening inwardly and the second fold opening outwardly;
• forming a score line in the sidewall of the shell at a place on the sidewall located radially inwardly of the radially outermost extent of the first fold to divide the sidewall of the shell into a central lid portion positioned on an inner side of the score line and a peripheral lid portion positioned on an outer side of the score line, the score line permitting the central lid portion to be severed from the peripheral lid portion, the second fold defining a gap between the score line and a portion of the central lid portion lying below the score line, the gap extending around the circumferential extent of the central lid portion and said gap being greater over a portion of the circumferential extent of the central lid portion than at another portion of the circumferential extent of the central lid portion;
• and
• securing an opening tab to the bottom wall of the shell so that a nose of the opening tab is positioned adjacent the score line.

Method of fabricating a safe container end closure, comprising:

• placing a shell in a fabricating machine which successively advances the shell along a plurality of stations to form the shell into a safe container end closure, the shell having a bottom wall and a sidewall;
• forming a first locating means in the bottom wall of the shell;
• forming a second locating means in the bottom wall of the shell;
• forming a rivet form in the bottom wall of the shell;
• forming first and second folds in the sidewall of the shell, the first fold opening inwardly and the second fold opening outwardly;
• forming a score line in the sidewall of the shell at a place on the sidewall located radially inwardly of the radially outermost extent of the first fold to divide the sidewall of the shell into a central lid portion positioned on an inner side of the score line and a peripheral lid portion positioned on an outer side of the score line, the score line permitting the central lid portion to be severed from the peripheral lid portion;
• securing an opening tab to the bottom wall of the shell so that a nose of the opening tab is positioned adjacent the score line;
• and
• radially locating the shell at at least some of said stations through use of said first locating means and rotationally orienting the shell at at least some of said stations through use of said second locating means to ensure proper radial location and rotational orientation of the shell at the stations.

Method of fabricating a safe container end closure comprising:

• positioning a shell in a fabricating machine, the shell including a bottom wall and a sidewall extending upwardly from the bottom wall;
• forming first and second folds in the sidewall of the shell, the first fold opening inwardly and the second fold opening outwardly;
• pressing a V-shaped die element against the sidewall of the shell at a place on the sidewall located radially inwardly of the radially outermost extent of the first fold to form in the sidewall a V-shaped score line, the V-shaped die element being oriented non-perpendicular to said sidewall during formation of the V-shaped score line so that the sides of the V-shaped score line are of different length, the V-shaped score line dividing the sidewall of the shell into a central lid portion positioned on an inner side of the score line and a peripheral lid portion positioned on an outer side of the score line, the V-shaped score line permitting the central lid portion to be severed from the peripheral lid portion;
• and
• securing an opening tab to the bottom wall of the shell so that a nose of the opening tab is positioned adjacent the score line.