Device for describing an ellipse

Details Device for describing an ellipse Device for describing an ellipse

1979-05-29

1981-01-13

Hinson, Harrison L.

Geometrical instruments

Scriber

Curved line

301649, B43L 1104, B26B 300

Patent

active

042441064

ABSTRACT:
A device for describing an ellipse. An enclosed arcuate first slot extends through a cylindrical shell. A path-generating disc fits inside the shell and enables the shell to rotate relatively thereto, and to it is secured a square bottom plate having a plurality of sharp points for centering the device. The disc has a diametrically-extending slot and, perpendicular thereto, a diametrically-extending recess in its upper surface. A cylindrical cam has a path-defining circular projection that rides snugly back and forth in the disc's recess. A cylindrical face of the cam has a radial opening aligned with and leading into another diametrical slot and a tangential opening parallel to that slot. An eccentricity-determining rod fits through the radial opening into the cam's slot, with sliding adjustment; its inner end extends out vertically into the disc's slot, for movement back and forth therealong. A radius rod, having one end secured in the cam's tangential opening, extends out through the shell's slot, and its outer end carries scribing means. A circular top closure for the shell has a slot parallel to the disc's recess and a scale along one edge of the slot for indicating the amount of eccentricity for which the device is set.

REFERENCES:
patent: 1474868 (1923-11-01), Walker
patent: 1997814 (1935-04-01), Dubois
patent: 2762126 (1956-09-01), Shaw
patent: 3845676 (1974-11-01), Pierce
patent: 4112793 (1978-09-01), Pierce

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