Drafting instrument

Details Drafting instrument Drafting instrument

1979-08-31

1980-09-16

Haroian, Harry N.

Geometrical instruments

Scriber

Compound curved and straight-line

B43L 900

Patent

active

042221714

ABSTRACT:
A drafting instrument wherein a plate having a circular through opening concentrically arrayed thereabout with calibrated scales and into which a dish having handles is insertable and rotable therein, the drafting instrument being positioned on one face of a sheet to be worked, the dish having a track upstanding from its floor and extending generally along an axis of the dish, a carriage moveable along the track, a plunger being selectively depressible and carried by the carriage, a graphite rod, held by and depending from the plunger extending through an opening of the track, for working engagement with the worksheet.

REFERENCES:
patent: 1266010 (1918-05-01), Golden
patent: 1927992 (1933-09-01), Pulver
patent: 2624117 (1953-01-01), Paci
patent: 3460261 (1969-08-01), Frey
patent: 3548503 (1970-12-01), Feltenberger

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