Binder device releasably engaging aperture or notch of sheet – Sheet retainer with releasable keeper
Patent
1987-10-19
1988-09-27
Bell, Paul A.
Binder device releasably engaging aperture or notch of sheet
Sheet retainer with releasable keeper
281 15R, 281 25A, 402 80R, 412 39, B42F 300
Patent
active
047737875
ABSTRACT:
A binding device for holding loose-leaf papers comprises a binder folded by a flexible material to form of a plurality of openings each constructed by two circumferential hooks, an engageable strip and two ended envelopes. The binder passes through a number of holes punched on each loose-leaf paper and the openings are faced outwardly. The longitudinal strip has two parallel longitudinal slots for corresponding to the hooks of the binder so that the binder can be engaged with the engageable strip. After that, the ended envelopes envelop on either end of the strip to prevent the strip from sliding.
REFERENCES:
patent: 1556049 (1925-10-01), Trussell
patent: 2139480 (1938-12-01), Young
patent: 2463946 (1949-03-01), Brook
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