| 摘要 |
An improved can closure device for the closing of easy-open metal can end walls including: a one piece closing tab having a central body, circumferential flange, annular sealing ring, semi-annular locking ring, semi-annular locking channel, tab opening strip, and a hole for attachment to a can end wall; an improved metal opening tab; an elongated attaching post/rivet; and a sealing channel provided in the sheet metal can end wall. The closing tab is co-mounted with and beneath the improved metal opening tab and minimally impacts the can opening function of the metal opening tab. The consumer opens the can in much the same way as he or she now does by using the existing metal opening tab. After the can is opened, the closing tab is rotated approximately 180 degrees, aligned with the can opening, and pushed downwardly into place to close the can, thus preventing loss of contents due to spillage, providing protection of the contents from dirt, sand, or insects, and retarding loss of carbonation. Improvements to the metal opening tab and the attaching post/rivet are required to accomodate the closing tab. These improvements consist of a downward enlargement of the side wall on the lever end of the metal opening tab, an elongation of the attaching post/rivet, and the provision of an annular sealing channel provided in the metal can end wall. Other than the aforesaid improvements, the metal can end wall and it's attachment to the can side wall are similar to that in common use today.
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