Triangular drafting instrument

Details Triangular drafting instrument Triangular drafting instrument

1993-01-06

1995-05-30

Will, Thomas B.

Geometrical instruments

Straightedge type

Plural straightedges nonadjustably fixed at right angles

33476, B43L 7027

Patent

active

054190541

ABSTRACT:
A flat triangular piece, usually of shatter resistant plastic, is formed with straight edges and is used in connection with a T-square for drawing perpendicular lines and geometric shapes. The outside peripheral corners are rounded for safety purposes and the intermediate portions of the legs are slotted or recessed to permit the utilitarian reproduction of triangular lines and shapes with sharp points.

REFERENCES:
patent: 306869 (1884-10-01), Scott
patent: 629078 (1899-07-01), Holz
patent: 855987 (1907-06-01), Schlageter
patent: 1155059 (1915-09-01), Heathcote
patent: 1619427 (1927-03-01), McCaffery, Jr.
patent: 2122732 (1938-07-01), Uyeda et al.
patent: 2214408 (1940-09-01), De V. Arizpe
patent: 3181243 (1965-05-01), Zajac et al.
patent: 3375589 (1968-04-01), Dolgorukov

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