Method and means for centerless circle construction

Details Method and means for centerless circle construction Method and means for centerless circle construction

1984-04-30

1986-05-20

Frankfort, Charles

Geometrical instruments

Scriber

Curved line

33562, B43L 1320

Patent

active

045892105

ABSTRACT:
A template set for inscribing a plurality of curvilinear figures with pencil, inking pen or other marking means is disclosed. The invention comprises a two-part unit for small circles, or a three-part unit for larger circles, enabling an individual circle or family of circles to be drawn without a compass, where such circles have a common center. The device can further be used to draw ellipses of varying size, the ellipses having varying sizes and degrees of eccentricity, and having common foci. The device consists of an exterior holder, an interior holder, a large-circle guide portion and a small-circle guide portion. In the embodiment for drawing large circles, a shim is used to maintain the large-circle guide portion in spaced relationship from the drafting medium.

REFERENCES:
patent: D137905 (1944-05-01), Kardux
patent: D165849 (1952-02-01), Jordan
patent: 2604702 (1952-07-01), Collins
patent: 3081545 (1963-03-01), Bergman
patent: 3568327 (1971-03-01), Furuoka
patent: 3813787 (1974-06-01), Mercorelli
patent: 4251920 (1981-02-01), Cassagnes

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