Binder device releasably engaging aperture or notch of sheet – Depository
Patent
1979-08-06
1981-12-29
Bell, Paul A.
Binder device releasably engaging aperture or notch of sheet
Depository
402 48, 402 50, 402 52, B42F 1300, B42F 1330
Patent
active
043079725
ABSTRACT:
One piece, molded looseleaf books adapted to hold paper sheets with punched holes therein, certain of said books having a spine with front and rear walls and a back wall connected at its longitudinal edges to the front and rear walls by integrally molded living hinges; a rear cover panel and a front cover panel respectively connected to said front and rear walls by a living hinge, a plurality of tubular posts mounted on the rear wall and extending toward the front wall, and a plurality of plugs respectively comprising a stem mounted on the front wall and a head sized and positioned to slidably and frictionally seat in each tubular post when the front and rear walls were pivoted to be substantially parallel; and others of said books being two piece, molded books without a spine between the front and rear cover panels, which have an integrally molded strip connected to each panel by a living hinge, a plurality of posts on the lower strip, and post-penetrated holes on the upper strip.
REFERENCES:
patent: 388402 (1888-08-01), Dodge
patent: 776247 (1904-11-01), Krone
patent: 1728430 (1929-09-01), Mevi
patent: 3260264 (1966-07-01), McKowen
patent: 3574472 (1971-04-01), Cott
patent: 3612709 (1971-10-01), Miyamoto
patent: 4180340 (1979-12-01), Cosby
"Poly-Pro" Polypropylene, Spencer Chemical Co., Kansas City 5, Missouri (1963).
Bell Paul A.
Brown John S.
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