Ring binder

Details Ring binder Ring binder

1997-03-14

1999-11-02

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 42, B42F 304

Patent

active

059757850

ABSTRACT:
A ring binder comprising a substantially rigid curved upper casing structure supporting a pair of plate, and the plates are pivotally movable between a first position in which the angle between the upper surfaces of the plates is less than 180.degree., and a second position in which the angle between the upper surfaces of the plates is more than 180.degree., a lock to lock the pair of plates and triggers or a pair of half-ring members to operate the lock, and the lock acts at a first location on the ring binder and the triggers or pair of half-ring members act at a second location on the ring binder, the first location being longitudinally distal on the ring binder from said second location.

REFERENCES:
patent: 4571108 (1986-02-01), Vogl
patent: 5346325 (1994-09-01), Yamanoi et al.
patent: 5718529 (1998-02-01), Chan

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