Loose leaf binder

Details Loose leaf binder Loose leaf binder

1975-08-06

1977-11-01

Schnall, Jerome

Binder device releasably engaging aperture or notch of sheet

Sheet retainer travels arcuate path

Travel in plane perpendicular to axis of rotation

402 46, 402 47, 402 74, B42F 1330

Patent

active

040563260

ABSTRACT:
A stiff plastic sheet is heat-scored on spaced parallel lines to form front and rear binder covers hinged at the score lines to a wide backbone. Two post-mounting units formed of similar plastic sheet material have a base strip along one edge and a post-supporting strip along the other edge, connected by a web which is heat-scored so as to flex at two-spaced flex lines and which is cut away at spaced areas to leave a series of straps between the strips so that together they are more flexible than the cover hinges. The base strips are ultrasonically welded to the covers along the inner edges of the covers so as to hold the post-supporting strips for swinging movement about the flex lines which are spaced outward from the hinge lines between the covers and the backbone. Three extensible posts are connected by mounting bars to the two post-supporting strips and hold such strips in parallel but separable relation, in an arrangement such that in closed position of the covers the post-supporting strips lie substantially flat against the inner faces of the covers, and the posts are in shortened state. As the covers are swung about the cover hinge lines to open position, the web straps flex, the post-supporting strips are held parallel by the posts, the thus-held parallel post-supporting strips are carried outward to a more widely-spaced position in which they stand substantially perpendicular to the open covers at positions spaced outward from the edges of the backbone, and the posts are thereby substantially lengthened. The binder provides a compact container for a full stack of filler leaves and automatically lengthens the binder posts when opened so as to provide convenient access to its contents. The binder is especially adapted to be made of thermoplastic sheet stock, and requires no externally exposed rivets or other mechanical fasteners.

REFERENCES:
patent: 1101780 (1914-06-01), Blaylock
patent: 1954265 (1932-05-01), Schade
patent: 2253039 (1939-12-01), Lewis
patent: 2255121 (1941-09-01), Lakso
patent: 2255136 (1941-09-01), Vogt et al.
patent: 2318941 (1942-10-01), Henderson
patent: 2320101 (1942-09-01), Schade
patent: 2646800 (1950-06-01), Ratcliffe et al.
patent: 3097652 (1963-07-01), Villhard
patent: 3454694 (1969-07-01), Delaire et al.
patent: 3612709 (1971-10-01), Miyamoto
patent: 3793612 (1974-02-01), Driscoll

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