Geometrical instruments – Scriber – Curved line
Patent
1986-01-31
1987-08-25
Frankfort, Charles
Geometrical instruments
Scriber
Curved line
33565, B43L 1320
Patent
active
046883304
ABSTRACT:
A template set for inscribing a plurality of ellipses with pencil, inking pen or other marking means is disclosed. The invention comprises a two-part unit for small ellipses, or a three-part unit for larger ellipses, enabling an individual ellipse or series or ellipses to be drawn, whether or not such ellipses have common foci or eccentricity. The device can further be used to draw ellipses of varying size and degrees of eccentricity, and having common foci. The device consists of an exterior holder, an interior holder, a large-ellipse guide portion and a small-ellipse guide portion. In the embodiment for drawing large ellipses, a shim is used to maintain the large-ellipse 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: 3568327 (1971-03-01), Furuoka
patent: 4251920 (1981-02-01), Cassagnes
patent: 4589210 (1986-05-01), Konrad
Frankfort Charles
Henn Robert B.
Scanlon Patrick R.
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