| 摘要 |
PROBLEM TO BE SOLVED: To retain strongly the shape of a knob closure to be used for a purse, a handbag or the like, using an aluminum material that cannot be soldered or brazed and using a special connection and coupling means to reduce the overall weight. SOLUTION: Arched frames 4 are formed of upper frame members 2 presenting a U section, leg members 3 connected to both ends of the upper frame members 2, a pair of the frames 4 is used to connect rotatably the free ends of the leg members 3, the upper frames 2, and the leg members 3 are formed of an aluminum material, the upper frame members 2 and the leg members 3 can be connected strongly by rivet connection at least at one position, weight can be reduced with rigidity and strength increased. In addition, the rivet connection of the outside walls of the upper frame members 2 and the leg members 3, prevents traces of rivet connection from surfacing in the wall portion that becomes the insides of the upper frame members 2 and produces a touch of a high-grade product.
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