Ellipsograph

An ellipsograph comprising;

• a. a support member adapted to be disposed adjacent a surface on which an ellipse is to be generated,
• b. a crank pin actuating member and means for supporting same on the support member for rotation about a fixed axis, said actuating member defining a rotatable reference axis intersecting the fixed axis normal thereto,
• c. first and second rotatable crank pins and means for individually adjusting same to desired fixed positions along said reference axis of the actuating member,
• d. a first slide member and means for slideably connecting same to the support member for rectilinear movement relative thereto,
• e. means for operatively connecting said first crank pin to said first slide member for rectilinear movement therealong, the construction being such that rotation of said first crank pin translates rectilinear movement to said first slide member,
• f. a second slide member and means for slideably connecting same to the support member for rectilinear movement relative thereto but in a direction normal to the direction of movement of the first slide member,
• g. means for operatively connecting said second crankpin to said second slide member for rectilinear movement therealong, the construction being such that rotation of said second crankpin translates rectilinear movement to said second slide member, and
• h. an ellipse generating member and means for operatively connecting same to said first and second slide members for slideable rectilinear movement relative to both, the construction being such that the combined rectilinear movements of the first and second slide members is resolved into elliptical motion imparted to the ellipse generating member.