Ellipse drawing instrument

Abstract

There is provided an ellipse drawing instrument the design of which is based upon the theory of orthogonal projection of a circle comprising a first leg having a pin point to be fixed on the surface to be drawn and a second leg having a drawing tip to be revolved around the first leg, the two legs being connected by a connecting member such as a pair of bars having parallel orientation and characterized as having the pin point end of the first leg extend upwardly as an axle and inserted into a sleeve. The top of said sleeve is rotatably mounted to an upper axle. The top of the upper axle, is pivoted with an inclinable axle which is inserted into a sleeve constituting a part of the L shaped connecting member of the second leg and functioning as a revolving arm. The top of the said sleeve is formed integrally with a turning wheel. The top of the inclinable axle is pivoted with a handle having a knob on it. The second leg comprising the free end of the connecting member is inserted into a rotatable short axle, the lower end of which is pivoted with the upper end of another short axle which is rotatably mounted on top of a long sleeve having a vertical slot on its upper part. Under the long sleeve is slidably inserted a writing implement holder having an angle adjustable member to retain a writing implement such as pencil lead or a drawing pen. A pair of leveling plates having a horizontal slot with one end fixed at the middle of the lower sleeve on the first leg and the other end fixed at the upper end of the writing implement holder are pivoted to be slidably also in the said horizontal slot of the leveling plate.

Dependencies are inferred from the claim text.