Patent attributes
A drawing instrument includes a turning assembly including a handle, a post having an end center, a bevel gear rotatable about the post, and a lower extending socket; a gear assembly meshed with the bevel gear and including a wheel; a link assembly including a first link having an upper end pivotably secured to the wheel, and a second link pivotably secured to a lower end of the first link and having a lower portion received in the socket; and a drawing assembly including an arm including a scale and a groove, a wheeled support secured to the arm, a third link pivotably secured to the second link and the groove, a slider pivotably secured to the third link and adapted to slide in the groove, and a pen mounting bed adjustably fastened at the groove. Rotating the handle will cause the pen mounting bed to draw an ellipse.
