| 摘要 |
PROBLEM TO BE SOLVED: To increase the strength of a partition wall to partition a tab insertion opening from an opening part adjacent to it. SOLUTION: An almost arc-shaped reinforcing part 19 rising toward the center of the tab insertion opening 14 is formed at one corner part located at the end part of the side rim along the partition wall 18 among four corners on the opening rims of the tab insertion opening 14. Since the partition wall 18 is thick around the end part where the reinforcing part 19 is formed, strength is increased, and even if a tab 21a runs into the partition wall 18, the partition wall 18 is prevented from being deformed. In addition, since the partition wall 18 is thick only around the end part of the side rim extending along the partition wall 18, the opening region of the tab insertion opening 14 is kept in an almost rectangle as a whole, and no hindrance is caused when inserting the tab 21a. COPYRIGHT: (C)2005,JPO&NCIPI
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