| 摘要 |
A binder (1) for releasably retaining loose-leaves (72). The binder has a front cover (44) that lies flatly beneath its back cover (40) when the binder is open 360 degrees. The rings (46) of the binder can rotate around an edge of the flatly-folded cover to enable loose-leaves to lie flat above and below the cover. The binder also has a skeleton (50) with a minimal cross-section spine (53) which may be partially or completely embedded in a cover and rotates in relation to parallel front and back covers when the binder is open 360 degrees. The front cover, middle cover (42) and back cover are connected in a way so that they do not interfere with the rotation of the rings. Mechanisms to open and close the rings of the skeleton to allow addition or removal of loose-leafs, and ring shapes to optimize or stabilize the capacity of the binder during operation are also disclosed.
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