Binder device releasably engaging aperture or notch of sheet – Sheet retainer with base or depository
Patent
1996-05-14
1998-03-03
Pitts, A. L.
Binder device releasably engaging aperture or notch of sheet
Sheet retainer with base or depository
402 75, 402 54, 402 60, 281 29, B42F 1312
Patent
active
057227837
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE ART
This invention relates generally to paper file folders and, more particularly, to file folders of the type suitable for storage in such a manner that the loose papers secured within the folder are suspended vertically downward.
PRIOR ART
Various types of file folders are conventionally known. These prior-art folders are generally made of flat and rigid sheet material such as cardboard and synthetic plastics, and includes a pair of front and rear covers which are integrally connected with a back cover via fold lines or hinge sections. A binding fastener is fixedly attached to the inner face of the back cover as by bonding, welding or riveting.
A typical prior-art file folder includes a pair of front and rear covers having a longitudinal length longer than the lateral width and is designed to bind or secure a plurality of loose papers along their longer edges by a binding fastener. This type of paper binding will hereinafter be referred to as the "S-binding". In the conventional practice, the file folder with S-bound papers is usually kept or otherwise stored upright on a bookshelf or in a cabinet with the back cover to which the fastener is fixed standing upright in a vertical direction. This manner of storing will hereinafter be referred to as the "S-type storage.
Meanwhile, it is of late attempted for the purpose of efficient use of a limited space to place such file folders on a support shelf in such a position that the back cover is kept above and extends horizontally, with the loose papers that are S-bound within the file folder being suspended vertically from its binding fastener. This manner of storing will hereinafter be referred to as the "E-type storage.
However, when the S-binding file folder is kept in the E-type storage mode, the back cover tends to be bent downward and the hinge sections to be disfigured by the weight of the S-bound papers. More precisely, in a file folder deigned to secure a large number of loose papers, the back cover of the folder naturally has an extended width for accommodating them. With the paper fastener being securely fixed as by rivets in the central portion of the back cover, the whole weight of the S-bound papers concentrates on that central portion of the back cover, causing it to warp downward. In addition, the longitudinally extending hinge sections that foldably join both the front and rear covers to the back cover is less rigid than the rest of the folder. In the event that all of the covers are to be integrally formed of suitable synthetic plastic material, the two hinge sections are ordinarily made much thinner than the rest in order to facilitate folding of the front and rear covers. As the weight of the bound papers acts on the back cover,-the thin hinge sections are placed under a heavy stress, resulting in their excessive distortion as well as their reduced durability or shortened lifetime.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a new and improved file folder free from these and other problems inherent in the prior-art file folders.
In order to realize this object, a new arrangement is provided for the file folder. The file folder according to claim 1 includes a pair of foldable front and rear covers integrally connected to a central back cover, and a binding fastener securely fixed to the inner face of the back cover, and is characterized by that an engaging projection is formed at the inner face of at least one of the front and rear covers for abutting engagement with the binding fastener when the front and rear covers are closed.
The file folder according to claim 2 includes a pair of foldable front and rear covers integrally connected to a central back cover, and a binding fastener securely fixed to either one of the front and rear covers at a location in the neighborhood of the adjoining back cover, and is characterized by that an engaging projection is formed at the inner face of the other of the front and rear covers for abutting engagement with the binding fastener when the front and rear cove
REFERENCES:
patent: 1763075 (1930-06-01), Unger
patent: 1905437 (1933-04-01), Buchan
patent: 2083434 (1937-06-01), Crump
patent: 2791220 (1957-05-01), McBee
patent: 3958886 (1976-05-01), Price
patent: 4314716 (1982-02-01), Errichiello
patent: 4750884 (1988-06-01), Bourgeois et al.
patent: 5375883 (1994-12-01), Wyant
Kokuyo Co. Ltd.
Krolikowski Julie A.
Pitts A. L.
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