Ellipsograph

Details Ellipsograph Ellipsograph

1979-07-17

1980-10-07

Haroian, Harry N.

Geometrical instruments

Scriber

Curved line

B43L 1104

Patent

active

042260221

ABSTRACT:
An ellipsograph comprises an inner toothed horizontal ring gear serving as a support. A diametrically disposed main seat bar is mounted inside of the ring gear and rotatable about the center. A vertical shaft is mounted on the main seat with a revolving arm mounted thereon. A drawing implement such as a pen is slidably mounted on said arm. The main seat bar has a small gear provided on one end of the seat bar to be driven through meshing engagement with the inner teeth of the ring gear. Such movement is transmitted through a series of sprocket and chain trains disposed on the seat bar to the vertical shaft having the revolving arm. The track of the writing implement forms an ellipse when the seat bar is caused to rotate one revolution upon the ring gear.

REFERENCES:
patent: 1876069 (1932-09-01), O'Byrne
patent: 3114974 (1963-12-01), Braginetz

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