Illuminated drafting aid

Details Illuminated drafting aid Illuminated drafting aid

1986-02-05

1987-05-19

Martin, Jr., William D.

Geometrical instruments

Straightedge type

Plural straightedges, relatively moveable

33419, 33493, 33562, 362109, B43L 1302

Patent

active

046656235

ABSTRACT:
A drafting T-square including a base block with a pivotable straight bar which can be manipulated as a protractor. A scale is slidable along the straight bar for extending beyond the straight bar. A further arm is pivotable with respect to the straight bar. A lamp on the base block illuminates the straight bar for providing illumination to the area to be drawn.

REFERENCES:
patent: 798721 (1905-09-01), Wilson
patent: 1045695 (1912-11-01), Goldwater
patent: 3375588 (1968-04-01), Pelham
patent: 4075467 (1978-02-01), Peterson
patent: 4359825 (1982-11-01), Erickson

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