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US Patent 7461459 Instrument for drawing ellipse or the like

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Is a
Patent
Patent

Patent attributes

Patent Jurisdiction
United States Patent and Trademark Office
United States Patent and Trademark Office
Patent Number
7461459
Date of Patent
December 9, 2008
Patent Application Number
11652887
Date Filed
January 12, 2007
Patent Citations Received
‌
US Patent 11999186 Centerless drafting tool
3
Patent Primary Examiner
‌
Christopher W Fulton
Patent abstract

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.

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