Ring binder

Details Ring binder Ring binder

1996-02-21

1998-12-08

Fridie, Jr., Willmon

Binder device releasably engaging aperture or notch of sheet

Sheet retainer travels arcuate path

Travel in plane perpendicular to axis of rotation

402 38, B42F 304

Patent

active

058460136

ABSTRACT:
A ring binder is disclosed as comprising a substantially rigid curved upper plate supporting a pair of pivotable lower plates mounted with a plurality of pairs of half rings, and a lever at each end of the ring binder, wherein the curved upper plate comprises a W-shaped ridge member or trough member between each of its longitudinal ends and the pair of half rings nearest thereto.

REFERENCES:
patent: 4368995 (1983-01-01), Cohen
patent: 4434534 (1984-03-01), Handler
patent: 5180247 (1993-01-01), Yu
patent: 5286128 (1994-02-01), Gillum
patent: 5348412 (1994-09-01), Fullen

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