Line drawing instrument

Details Line drawing instrument Line drawing instrument

1986-04-10

1988-04-26

Haroian, Harry N.

Geometrical instruments

Scriber

Parallel line

33DIG9, B43L 1302

Patent

active

047395583

ABSTRACT:
A drawing apparatus is disclosed for guiding the continuous drawing of two intersecting lines with interconnecting curved corner portions. The apparatus comprises a set of rulers which intersect one another at a desired angle of 90.degree. or less to define thereby a corner. A guide is provided for guiding the continuous drawing of two intersecting lines with the curved corner. The guide has a base portion with an external edge. An aperture extends through the base and has an interior edge of a shape to define the desired curved shape for the corner. The guide remains stationary in the corner defined by the rulers to cause a drawing instrument to follow the interior surface of the aperture in continuously drawing a curved corner of desired shape from a first line merging into a second intersecting line.

REFERENCES:
patent: 2509164 (1950-05-01), Nath
patent: 3465445 (1969-09-01), Fisher

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