Binder device releasably engaging aperture or notch of sheet – Depository
Patent
1988-09-16
1989-11-14
Bell, Paul A.
Binder device releasably engaging aperture or notch of sheet
Depository
281 33, 402 70, 402501, B42F 1300, B42F 500, B42D 300
Patent
active
048803278
ABSTRACT:
A combination loose-leaf ring binder and foldable bookstand is quickly erectable and develops increasing stability with increasingly heavier loads under the designed gravity lock principle. Quick closure is effected upon removal of the load. In combination, a juxtaposed pair becomes a larger display stand. Four alternative erected configurations serve as a drawing board, a flip chart easel a lectern and as a copyholder for typing, all at their various appropriate angles. Other embodiments of the bookstand feature extra compact folding and integration with a book cover.
REFERENCES:
patent: 1086906 (1914-02-01), Felten
patent: 1112041 (1914-09-01), Treadway
patent: 1564594 (1925-12-01), Leh
patent: 1659395 (1928-02-01), Douglas
Bell Paul A.
Sanabria Richard F.
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