Drafting aid

Details Drafting aid Drafting aid

1980-08-25

1982-10-26

Haroian, Harry N.

Geometrical instruments

Straightedge type

Rules

B43L 700

Patent

active

043554725

ABSTRACT:
A drafting aid particularly useful for association with T-squares and the like wherein a vertical or normal datum point is easily obtained and wherein the drafting aid is movable about the extent of the T-square or other linear edge with which the device is used. In an exemplary embodiment the drafting aid comprises a vertically oriented member in association with a ruler or the like comprising the linear edge and the combination is associated with a T-square so as to have not only a means of aiding in the placement of vertical reference lines but also a means of ease of measuring distances between vertical reference points or lines.

REFERENCES:
patent: 953464 (1910-03-01), Heller et al.
patent: 998616 (1911-07-01), Jewell
patent: 1110195 (1914-09-01), Erwin
patent: 1215663 (1917-02-01), Krueger
patent: 1602490 (1926-10-01), Homan
patent: 2456676 (1948-12-01), Chowns
patent: 3672061 (1972-06-01), Alessi

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