Plotting device

Details Plotting device Plotting device

1982-01-08

1983-01-25

Phillips, Charles E.

Geometrical instruments

Straightedge type

33424, B43L 700

Patent

active

043695833

ABSTRACT:
A device for plotting points on a drawing surface comprises a number of separate parts which are assembled on the drawing surface to produce a drawing instrument which covers a required angular range. The parts include a pivot boss which may be taped to the surface with its cross-wire over a given reference center, a radius arm which is pivotally mountable on the boss, and a plurality of interlocking protractor segments having an angular scale. The radius arm has a detachable radial distance scale, a vernier angular scale, and also a small hole for plotting positioning arcs on the surface. The protractor segments are separately attachable to the surface and may be positioned with respect to the center by means of the said positioning arcs. In an alternative embodiment the radius arm comprises a radial distance scale member with a pivot member clamped to one end and a vernier angular scale clamped to the other end.

REFERENCES:
patent: 977048 (1910-11-01), Smith
patent: 1809058 (1931-06-01), Miner et al.
patent: 2345367 (1944-03-01), Thorne
patent: 3241240 (1966-03-01), Boehm
patent: 4175330 (1979-11-01), Hermann

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