초록 ▼

A metal closure for beverage containers of the type having a center panel, a center-panel ring, an inner leg, and a pull-tab opener, includes circumferential variegations for increasing the buckling pressure of the container. The circumferential variegations are cold-worked or coined into the center

A metal closure for beverage containers of the type having a center panel, a center-panel ring, an inner leg, and a pull-tab opener, includes circumferential variegations for increasing the buckling pressure of the container. The circumferential variegations are cold-worked or coined into the center-panel ring and/or into portions of the closure that are adjacent to the center-panel ring. The circumferential variegations include coined surfaces with variegated lengths, variegated coin angles, variegated coin residuals, variegated spaces between coined surfaces, or variegated widths of the center panel. The circumferential variegations achieve non-axisymmetric doming of the metal closure and increase the buckling pressure of the closure by obviating excess metal in the center panel that typically results from scorning the center panel for the easy open end.

대표청구항 ▼

A container closure which comprises: an inner portion having a perimeter; an outer portion being disposed perimetrically around said inner portion and being spaced outwardly therefrom; a connecting portion being disposed perimetrically between said inner and outer portions and being integral with bo

A container closure which comprises: an inner portion having a perimeter; an outer portion being disposed perimetrically around said inner portion and being spaced outwardly therefrom; a connecting portion being disposed perimetrically between said inner and outer portions and being integral with both of said portions; and circumferentially-variegated strengthening means, comprising a selected part of said closure that generally follows the contour of said perimeter, for strengthening said container closure.