Triangle

Details Triangle Triangle

1983-07-15

1984-06-26

Little, Willis

Geometrical instruments

Straightedge type

Plural nonadjustable straightedges forming nonright angles

33174N, B43L 700

Patent

active

044557604

ABSTRACT:
This disclosure is directed to a triangle for drafting isometric drawings, the triangle being a generally planar thin body having a periphery bounded by first, second and third edges defining first, second and third corners with the first two corners setting-off an included angle of 30 degrees and the third corner setting off an included angle of 120 degrees and at least one opening within the periphery of the triangle having at least one straight edge portion which sets off with the most adjacent body edge an included angle of thirty degrees opening away from the 120 degree corner and the last-mentioned edge of the opening being disposed normal to the most remote edge of the 120 degree corner whereby during the drafting of isometric drawings, the triangle need not be inverted, flipped or rotated or the drawing position changed or another conventional triangle utilized to draft isometric drawings.

REFERENCES:
patent: 217967 (1879-07-01), White
patent: 697594 (1902-04-01), Alteneder
patent: 1287440 (1918-12-01), Rivkin
patent: 2593914 (1952-04-01), Palitto
patent: 2610407 (1952-09-01), McQuaid, Sr.
patent: 4404753 (1983-09-01), Klok

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