Geometrical instruments – Scriber – Curved line
Reexamination Certificate
2007-01-12
2008-12-09
Fulton, Christopher W (Department: 2841)
Geometrical instruments
Scriber
Curved line
C033S027030
Reexamination Certificate
active
07461459
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.
REFERENCES:
patent: 2017430 (1935-10-01), Anderson
patent: 2318384 (1943-05-01), Fried
patent: 3264736 (1966-08-01), Novak
patent: 3797119 (1974-03-01), McDow
patent: 3820244 (1974-06-01), Novak
patent: 3854213 (1974-12-01), Armitt
patent: 4045875 (1977-09-01), Cortez
patent: 4226022 (1980-10-01), Chen et al.
patent: 4790222 (1988-12-01), Morgan
patent: 5056230 (1991-10-01), Lok
patent: 5189800 (1993-03-01), Morita et al.
patent: 6308426 (2001-10-01), Lim
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