| 摘要 |
In a standard binder, the improvement comprising the provision of a closure connected by a hinge to one of the covers at an outside edge thereof, a ledge on the closure and having an upper surface, the surface located at a distance from the cover to which the closure is connected approximately equal to the distance between the inner faces of the two covers at the spine, whereby the covers are maintained in substantially parallel relationship to each other regardless of the amount of paper in the binder. In alternate forms of the binder, a flap is provided which is releasably secured to one of the covers. The flap may overlie or be tucked under the other cover, and the closure and ledge are so arranged that the covers are approximately parallel when the binder is closed and secured.
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