Base plate for a loose-leaf holder

Details Base plate for a loose-leaf holder Base plate for a loose-leaf holder

1988-09-01

1990-02-27

Bell, Paul A.

Binder device releasably engaging aperture or notch of sheet

Sheet retainer travels arcuate path

Travel in plane perpendicular to axis of rotation

402 80R, B42F 1322

Patent

active

049041029

ABSTRACT:
A base plate for a closure mechanism of a loose-leaf holder for sheets defining holes along an edge thereof, the base plate carrying fixed, straight prongs for receiving the holes of the sheets and pivotal prongs cooperating with the fixed prongs, and the base plate being delimited by a first pair of parallel edges opposite each other and a second pair of parallel edges extending substantially perpendicularly to the first pair of edges, one of the edges of the first pair defining an inwardly projecting recess and the opposite edge of the first pair defining a protruding portion projecting outwardly in the same direction as the inwardly projecting recess.

REFERENCES:
patent: 516523 (1894-03-01), Costigan
patent: 531887 (1895-01-01), Wilkes
patent: 2519932 (1950-08-01), Rostoker et al.

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