Double aperture paper lifter

Details Double aperture paper lifter Double aperture paper lifter

1994-06-20

1996-04-02

Fridie, Jr., Willmon

Binder device releasably engaging aperture or notch of sheet

Miscellaneous

Sheet lifters

402 80R, B42F 1300

Patent

active

055034896

ABSTRACT:
A paper lifter and a loose-leaf ring binder combine to form a class two lever system. The lifter has two sets of apertures. A first set fits slidably over the rings. A curved load arm reaches inward from the apertures and abuts a plate protecting the binder ring mechanism; the curvature provides a variable length load arm with lifter angle. The contact point between the load arm and the plate becomes a system fulcrum; yet the contact point (and the lifter) is free to slide along the plate. An effort arm extends oppositely to reach and slide against the binder cover. A second set of apertures are slots in the curved load arm. The slots, in line with the rings, prevent ring interference with continuous contact between the load arm and the plate. The system fulcrum then remains on the plate for the first and critical phase of the closing motion.

REFERENCES:
patent: 1770670 (1930-07-01), Raynolds
patent: 2276987 (1942-03-01), Kengott
patent: 2505694 (1950-04-01), Stuercke
patent: 3306301 (1967-02-01), Mason
patent: 3366118 (1968-01-01), Beyer

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