Ellipsograph
OwnerJen-Sheng Chen, Jen-Hung Cheninventors
Life of this patent
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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.
Claims6
An ellipsograph comprising:
- a ring gear having internal teeth;
- a main seat bar disposed diametrically within said ring gear and being rotatable about the center of said ring gear;
- a vertical shaft mounted on said seat bar;
- an arm mounted on said shaft for rotation therewith;
- a drawing implement adjustably mounted on said arm;
- a drive gear mounted on one end of said seat bar and meshes with said inner teeth of said ring gear;
- and
- chain drive means drivingly interconnecting said drive gear with said vertical shaft so that rotation of said main seat bar produces rotation of said drive gear which is transmitted to said vertical shaft for rotating said arm to produce an ellipse whose major axis equals twice the sum of a first value defined by the distance between the center of said ring gear and said vertical shaft and a second value defined by the distance between said vertical shaft and said drawing implement, and whose minor axis equals twice the difference between said first and second values.
Dependencies are inferred from the claim text.