Ring binder

Details Ring binder Ring binder

1994-08-26

1997-03-04

Han, Frances

Binder device releasably engaging aperture or notch of sheet

Depository

402 76, 402502, 402 80R, 281 29, 281 18, 281 36, B42F 1300

Patent

active

056072465

ABSTRACT:
A ring binder which is easy to grasp at the spine and is capable of accommodating a great number of loose-leaf sheet. According to one embodiment, such a ring binder comprises a stiffener assembly, the stiffener assembly having an interior surface and an exterior surface and comprising a front cover stiffener panel, a rear cover stiffener panel and a flexible backing. The front and rear cover stiffener panels are spaced apart from one another and are interconnected by the flexible backing, the stiffener assembly being devoid of any stiffeners disposed between the front and rear cover stiffener panels. An interior surface sheet, preferably of canvas material, is secured to the interior surface of the stiffener assembly, and an exterior surface sheet, preferably of canvas material, is secured to the exterior surface of the stiffener assembly. A ring assembly is secured to the rear cover stiffener panel. In this manner, the surface sheets and the stiffener assembly cooperatively define a binder cover having front and rear covers interconnected by a flexible spine, the flexible spine being conformable about the ring assembly.

REFERENCES:
patent: 529614 (1894-11-01), Frith
patent: 3572957 (1971-03-01), Strassberg
patent: 4600346 (1986-07-01), Podosek
patent: 4630843 (1986-12-01), Willat
patent: 5020828 (1991-06-01), Moor
patent: 5104147 (1992-04-01), King
patent: 5213368 (1993-05-01), Wyant
patent: 5222826 (1993-06-01), Wyant

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