Instrument for tracing curved figures particularly ellipses

Details Instrument for tracing curved figures particularly ellipses Instrument for tracing curved figures particularly ellipses

1978-05-22

1979-04-24

Haroian, Harry N.

Geometrical instruments

Scriber

Curved line

B43L 1104

Patent

active

041504879

ABSTRACT:
A hand-held compass-type instrument for tracing curved figures, particularly ellipses, is described comprising a manipulatable finger-gripping element; an anchor arm pivotably mounted at one end to one end of the finger-gripping element, the opposite end of the anchor arm being adapted to be anchored to the surface on which the curved figure is to be traced; a tracing arm pivotably mounted at one end to the finger-gripping element, the opposite end of the tracing arm being adapted to trace the curved figure; and an eccentric linkage, having presettable means for presetting its eccentricity, coupled between the anchor and tracing arms for constraining the tracing arm to pivot in a presettable eccentric manner with respect to the anchor arm when the finger-gripping element is manipulated to trace the figure.

REFERENCES:
patent: 1847997 (1932-03-01), Bennett
patent: 2393698 (1946-01-01), Moen
patent: 4010546 (1977-03-01), Tien

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