Ruling device for the blind

Details Ruling device for the blind Ruling device for the blind

1980-11-24

1983-01-04

Phillips, Charles E.

Geometrical instruments

Straightedge type

Base attached

33443, 33494, B43L 1300

Patent

active

043666264

ABSTRACT:
A board has indexed tracks along each side with parallel transverse bars having end feet riding in the tracks and a marker being laterally adjustable between successive like separated positions along the bars for setting a marking position on a sheet of paper mounted on the board by releasable retaining means to identify to a blind person the end of ruling or marking upon the paper. A disc is also mountable for rotation and angular indexing on the board with a crosspiece adapted to slide in the tracks carrying a rotatable arm with marking means adjustably positioned thereon for drawing circles and rectangles on paper mounted on the board.

REFERENCES:
patent: Re24927 (1961-01-01), Shelly
patent: 1013086 (1911-12-01), Winters
patent: 1356987 (1920-10-01), Ingle
patent: 1849493 (1932-05-01), Larkin
patent: 2194889 (1940-03-01), De Lisle
patent: 2562479 (1951-07-01), Spikes
patent: 4047304 (1977-09-01), Delre
patent: 4223447 (1980-09-01), Greenless

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