| 摘要 |
PCT No. PCT/JP96/00174 Sec. 371 Date Sep. 16, 1996 Sec. 102(e) Date Sep. 16, 1996 PCT Filed Jan. 26, 1996 PCT Pub. No. WO97/06015 PCT Pub. Date Feb. 20, 1997In this ring binder, a pair of opposing swing base plates 3 are connected together at two locations near the center of their longitudinal swinging edges 3a by means of a joint mechanism 6 through operative engagement between the recessed joint section 61 having a projection 63 and the extended joint section 62 having a slot 64, so that the opposing swing base plates 3 are pivotally movable together in unison, and the swinging edges 3a are pivotally movable together toward and away from the top face 21a of the recessed section 21 in the fixed base plate 2.
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