Loose-leaf binder

Details Loose-leaf binder Loose-leaf binder

1988-12-13

1990-02-27

Bell, Paul A.

Binder device releasably engaging aperture or notch of sheet

Sheet retainer travels arcuate path

Travel in plane perpendicular to axis of rotation

402 37, 402 38, 402 39, 402 41, 402 60, B42D 1324, B42D 1326

Patent

active

049041037

ABSTRACT:
A binder for releasibly retaining pages as well as covers which include a plurality of mating pairs of semicircular rings whose peripheries essentially are all exposed so that the paper or covers can be extended therefrom essentially 360 degrees therearound. The mating pairs of semicircular rings are forced together or retained in an open position either by an overcenter mechanism at their inner end or a lockable hinge structure, either one of which extends primarily within the peripheries of the semicircular ring pairs when they are in their closed positions.

REFERENCES:
patent: 2041168 (1936-05-01), Dawson
patent: 2311090 (1943-02-01), Schade
patent: 2511153 (1950-06-01), Emmer
patent: 3205895 (1965-09-01), Johnson
patent: 4349289 (1982-09-01), Cardellini
patent: 4355916 (1982-10-01), Cardellini
patent: 4441834 (1984-04-01), Cardellini
patent: 4552478 (1985-11-01), Cohen

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