| 摘要 |
PROBLEM TO BE SOLVED: To improve a high cost for making airtight as to a conventional fastener in which double or triple fasteners are applied in order to enhance airtight safety. SOLUTION: A member 1 is arranged with projected portions 3 tapered wider upward and narrower downward, a member 2 is arranged with recessed portions 4 tapered wider downward and narrower upward, and the projected portions 3 are fitted into the recessed portions 4. A another method is also available where a member 11 and a member 12 are disposed with projected portions and recessed portions one after another with a pitch shift between the members, respectively, and the projected portions and the recessed portions are fitted together.
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