Ring binder cover

Details Ring binder cover Ring binder cover

1984-11-19

1986-04-22

Bell, Paul A.

Binder device releasably engaging aperture or notch of sheet

Depository

Face member with back member

281 29, B42F 300, B42D 300

Patent

active

045838771

ABSTRACT:
A ring binder cover is composed of a pair of thermoplastic sheets superimposed in edge-to-edge relation with stiffener insert panels disposed therebetween. The inner edges of the insert panels are spaced apart a distance which is approximately the width of the back panel and hinged portions of the binder. The peripheral edge portions of the two thermoplastic sheets are sealed together and provide a sealed envelope for the stiffener inserts which are disposed therebetween and define semi-rigid back and front cover panels of the binder. A discrete, semi-rigid spine is affixed to the outer surface of the cover in the area between the inner edges of the inserts. The spine has a width less than the distance between the inserts and together define hinges for the binder covers. The spine is composed of a stiffening insert panel encased within a thermoplastic sheath material and a ring mechanism is affixed on the inner surface of the cover opposite the spine.

REFERENCES:
patent: 1787958 (1931-01-01), Schade
patent: 1923646 (1933-08-01), Trussell
patent: 2024881 (1935-12-01), Schade
patent: 2772427 (1956-12-01), Rankin
patent: 3206225 (1965-09-01), Oleson
patent: 3262454 (1966-07-01), Shillinger
patent: 4400107 (1983-08-01), Pitts

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