| 摘要 |
PROBLEM TO BE SOLVED: To decrease a molding cost of a resin-made loose-leaf binder. SOLUTION: A ring part of the binder 11 is divided into three parts, and 1/3 ring parts 14 and 15 are connected to the top and the bottom of a central 1/3 ring part 13 connected to a backbone part 12 through hinge parts. The upper and lower 1/3 ring parts 14 and 15 have phase lacked and patched structures at the tips of which symmetrical step difference parts 19 and 20 are formed, and the upper and lower 1/3 ring parts 14 and 15 are connected with each other by a sickle-shaped hook part 17 provided on the surface of the step difference part 19 of the upper 1/3 ring part 14 and a catch part 18 provided on the back surface of the step difference part 20 of the lower 1/3 ring part 15. It can be molded by using a simple slide mold and the molding cost can be decreased by composing a fitting means by the hook part and the open type catch part. COPYRIGHT: (C)2004,JPO&NCIPI
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