Metal ring binder with auxiliary springs

Details Metal ring binder with auxiliary springs Metal ring binder with auxiliary springs

1998-08-27

2000-04-04

Pitts, Andrea L.

Binder device releasably engaging aperture or notch of sheet

Sheet retainer travels arcuate path

Travel in plane perpendicular to axis of rotation

402 26, 402 31, 402 46, B42F 304

Patent

active

060452862

ABSTRACT:
A metal ring binder is improved by adding at least one auxiliary spring for supplementing the spring action of the spine upon the blades to which the rings are attached, so as to increase the closing force of the rings.

REFERENCES:
patent: 1157184 (1915-10-01), Schade, Jr.
patent: 2381040 (1945-08-01), Dawson et al.
patent: 4281940 (1981-08-01), Rhee
patent: 4552478 (1985-11-01), Cohen
patent: 5158386 (1992-10-01), Mann, Jr.
patent: 5393156 (1995-02-01), Mullin et al.
patent: 5692847 (1997-12-01), Zane et al.
patent: 5782569 (1998-07-01), Mullin et al.
patent: 5788392 (1998-08-01), Cheung

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