Apparatus for tracing ellipses

Details Apparatus for tracing ellipses Apparatus for tracing ellipses

1978-02-21

1979-09-04

Haroian, Harry N.

Geometrical instruments

Scriber

Curved line

B43L 1104

Patent

active

041663209

ABSTRACT:
Apparatus for tracing elliptical curves comprising a T-shaped support member having perpendicular longitudinal and transverse branches and formed as a one piece injection molded body. The T-shaped member carries a point support on the longitudinal branch for piercing a tracing surface on which a curve is to be reproduced. Two sliders are respectively supported in recesses in the branches and the sliders are coupled together for correlated movement in the branches. A marking element is supported by the coupling for tracing a curve on the tracing surface in accordance with the movement of the sliders.

REFERENCES:
patent: 422252 (1890-02-01), Rawson
patent: 2646623 (1953-07-01), Coats
patent: 2879596 (1959-03-01), Kroenlein
patent: 2996804 (1961-08-01), Hancox

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