| 摘要 |
[PROBLEM] For ring binders of externally fitted types it is an essential requirement that they do not interfere with the turning of loose leaves. Conventional binders have had too broad backbone plates supporting binder rings to permit smooth turning of the leaves. [MEANS FOR SOLUTION] The invention provides a loose-leaf binder a loose-leaf binder comprising an elongate first backbone plate having a plurality of first binder half-rings formed at given intervals upright along its outer edge, and a second backbone plate having a plurality of second binder half-rings formed at given intervals upright along its edge opposite to that of the first backbone plate. The first and second backbone plates are adapted to be combined to close the first and second half-rings to form complete binder rings. The first backbone plate has a plurality of through-holes formed at given intervals in the longitudinal direction of the binder, across the length of the binder, and also has a plurality of engaging recesses formed in the outer edge surface on the side of the first half-rings. The second backbone plate has a plurality of pins that fit in the through-holes and a plurality of protuberances adapted to fit in the recesses in the position where the binder half-rings are closed together.
|
