Drafting instrument

Details Drafting instrument Drafting instrument

1978-12-07

1980-09-09

Shepperd, John W.

Geometrical instruments

Straightedge type

Square and pivoted straightedge

33424, B43L 1300

Patent

active

042210550

ABSTRACT:
A drafting instrument comprising a central plate member, and first and second drafting plates, each including two sides having first and second angularly related straight edges forming an angle therebetween and a third hypotenuse edge spanning the first and second edges, and mechanism pivotally coupling the first and second plates to the central plate member for swinging movement relative thereto and relative to each other.

REFERENCES:
patent: 1378745 (1921-05-01), Wavrin
patent: 2042885 (1936-06-01), Fay
patent: 2345477 (1944-03-01), Hull
patent: 2501521 (1950-03-01), Howard
patent: 2515761 (1950-07-01), DeJuhasz
patent: 2887775 (1959-05-01), Ross
patent: 3266156 (1966-08-01), Debs

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