Compass

Details Compass Compass

1985-05-15

1987-05-05

Stearns, Richard R.

Geometrical instruments

Scriber

Curved line

B43L 900

Patent

active

046620761

ABSTRACT:
A compass, comprising a sliding rod with a handle at an upper end, and a drawing portion. A slider is slidably mounted on the sliding rod. Two links are pivotally connected to the slider and to the drawing portion at respective first pivot points forming at least approximately a parallelogram. A crank is operatively pivotally connected to the sliding rod and to a center of one of the links at respective pivot points, the crank having a length between its pivot points equal to half the length of the link to which the crank is connected between the first pivot points of the one link.

REFERENCES:
patent: 2824373 (1958-02-01), Sjolund
patent: 3129514 (1964-04-01), Lintner
patent: 3358371 (1967-12-01), Liesong, Sr.

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