| 摘要 |
PROBLEM TO BE SOLVED: To form an undercut, provided on the inner surface of a metallic cylinder 29, without post-working. SOLUTION: A cylinder 29 is formed from a thin metal. A thin-wall part 10 having a wall thickness of not more than a half of the upper part is provided on the inner wall of the lower end of the cylinder 29. A step part 8 is provided at the upper end of the thin-wall part 10. The thin-wall part 10 is folded back inward so that a very small gap is formed between the front end of the thin-wall part 10 and the step part 8 to form an engaging concave groove 27e between the front end of the thin-wall part 10 and the step part 8. The engaging concave groove 27e is engaged with an engaging projection part 21 of other member to connect the cylinder 29 to the other member. COPYRIGHT: (C)2004,JPO
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