Geometrical instruments – Scriber – Curved line
Patent
1992-02-19
1993-03-02
Cuchlinski, Jr., William A.
Geometrical instruments
Scriber
Curved line
33 31, B43L 1104, B43L 11055
Patent
active
051898004
ABSTRACT:
An elliptical curve drawing device draws an ellipse having desired minor and major axes along given central axes. The device includes a y-axis movable member movably mounted on a base plate for movement along a y-axis which extends perpendicularly to a straight side of the base plate, and an x-axis movable member movably mounted on the base plate for movement along an x-axis which extends parallel to the straight side. The x- and y-axes are brought into alignment respectively with the major and minor axes of an ellipse to be drawn. The elliptical curve follows the path of movement of a point which is spaced from the circumference of a circle which is concentric with the ellipse and whose radius is A, equal to half of the minor axis of the ellipse, by a distance, parallel to the x-axis, which is equal to B cos.theta. where B is the half of the difference between the major axis 2(A+B) and the minor axis 2A of the ellipse and .theta. is the angle formed between the length B and the x-axis. In drawing the ellipse, the central axes of the ellipse can easily be aligned with desires minor and major axes through a simple positioning process. The elliptical curve drawing device can easily be handled in use, and a sufficient drawing pressure is developed on the tip of the drawing instrument for drawing the ellipse.
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Morita Shiro
Yoshitake Kazuo
Cuchlinski Jr. William A.
Fulton C. W.
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