Binder device releasably engaging aperture or notch of sheet – Coiled spring type sheet retainer
Patent
1993-11-04
1995-08-29
Bryant, David P.
Binder device releasably engaging aperture or notch of sheet
Coiled spring type sheet retainer
402 73, 281 271, B42F 306
Patent
active
054454670
ABSTRACT:
A binding file includes a front sheet, a rear sheet and a back. At the inside of the back, at only one edge of the back, the binding file includes a binding connection part having a free edge. This part is provided with one row of perforations which enables a binding element, incorporating ring-shaped closed binding rings, to be connected thereto so that sheets can be bundled interchangeably.
REFERENCES:
patent: 671041 (1901-04-01), Bailey
patent: 2112389 (1938-03-01), Trussell
patent: 2142816 (1939-01-01), Grumbacher
patent: 2155576 (1939-04-01), Wolfson
patent: 2228875 (1941-01-01), Grumbacher
patent: 4711469 (1987-12-01), Bogar
patent: 5186565 (1993-02-01), Jack
Bryant David P.
Sisam SA
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