Infinite radius circle drawing instrument

Geometrical instruments – Scriber – Curved line

Patent

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Details

33 27L, 33 27C, 33562, B43L 904, B44D 330

Patent

active

045301565

ABSTRACT:
A device for drawing circles which allows for an infinitely adjustable radius within a given range is provided by the use of a rotatable disk having an access hole therethrough offset from a center point of, but carried on a disk rotatable with respect to a fixed sheet member. The larger disk is freely rotatable and the disk with the access hole is prevented from rotating while the circle is being drawn.

REFERENCES:
patent: 1154673 (1915-09-01), Van Ness
patent: 1307233 (1919-06-01), Bernard
patent: 2190071 (1937-06-01), Keppers
patent: 2624117 (1950-06-01), Paci
patent: 3460261 (1968-01-01), Frey
patent: 3465445 (1969-09-01), Fisher
patent: 3699660 (1972-10-01), Siegel
patent: 4129948 (1978-12-01), Hatter et al.
patent: 4353166 (1982-10-01), Kettlestrings
patent: 4353672 (1982-10-01), Smith

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