Expandable book cover

Details Expandable book cover Expandable book cover

1975-03-11

1976-08-03

Schnall, Jerome

Binder device releasably engaging aperture or notch of sheet

Opposed sheet retainers involving relative rectilinear travel

402 75, 281 25R, 281 29, B42F 1312

Patent

active

039726320

ABSTRACT:
An expandable cover for books is provided for storing, protecting and labeling data processing sheets, accounting records, and the like, comprising a pair of cover boards hinged to corner members which carry openings for receiving sheet attaching means, spine elements for the back of the book cover which have at least one opening for receiving a back or spine protecting element therein, or alternatively, an expandable element such as a foldable material, stretchable material, or further alternatively, a slot in one of the spine elements which slidably engages the second spine element by means of a rivet like member.

REFERENCES:
patent: 697092 (1902-04-01), Krohn
patent: 777798 (1904-12-01), Manger
patent: 838323 (1906-12-01), Halpin
patent: 859630 (1907-07-01), Thompson
patent: 1827462 (1931-10-01), Crump
patent: 1911358 (1933-05-01), Gaertig
patent: 2099472 (1937-11-01), Emery
patent: 2129799 (1938-09-01), Viens
patent: 2335047 (1943-11-01), Ellis

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