Binder device releasably engaging aperture or notch of sheet – Pliant – deformable sheet retainer – Flaccid retainer secured by knotted – intertwined or wedge...
Patent
1978-07-17
1981-04-14
Bell, Paul A.
Binder device releasably engaging aperture or notch of sheet
Pliant, deformable sheet retainer
Flaccid retainer secured by knotted, intertwined or wedge...
402 21, 402 22, 402 77, 402502, B42F 300
Patent
active
042616646
ABSTRACT:
A one-piece binder blank is die cut from plastic sheet stock and formed with integral straps and strap keepers to fasten loose leaves in the binder. The blank is scored to form one or more fold lines defining a spine between front and back covers. At spaced positions along the spine, the back cover is cut out to form a plurality of binder straps integrally connected at their bases with the cover and having barbed heads at their free ends. At corresponding opposite locations, the front cover is cut to form two spaced slits and the strips of material between the slits are stretched and displaced to form low arched keepers through which the barbed ends are passed to secure the straps to the front cover. The straps are longer than the distance between the strap bases and the keepers when the binder is open flat, and stand arched across the spine so as to allow loose leaves thereon to swing freely from flat against one cover to flat against the other. The straps are scored to form fold or hinge lines at their bases, at the necks of the barbed heads, and at an intermediate point to control their arched shape and their action when the binder is closed.
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Bell Paul A.
Crawford Industries, Inc.
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