Geometrical instruments – Scriber – Curved line
Patent
1975-10-16
1977-05-24
Aegerter, Richard E.
Geometrical instruments
Scriber
Curved line
33 27K, B43L 1104
Patent
active
040246418
ABSTRACT:
An instrument for producing on the surface of a given sheet material a given geometric figure having preselected maximum width and length dimensions. A base through a suitable connecting structure carries a marking assembly which is freely movable with respect to the base and which has an inscribing member for inscribing on the surface of the sheet material the given geometric figure. An elongated bar is connected by a lower universal joint to the marking assembly and has an upper end adapted to be manipulated by the operator. Between its ends the bar extends slidably through an upper universal joint which can be adjusted in elevation so as to select a point along the bar about which the latter can be tilted in all directions. A template is formed with an opening through which the bar extends, the template having an inner peripheral edge conforming to the general configuration of the geometric figure which may, for example, be an ellipse, and a template-adjusting structure is operatively connected with the template for adjusting the angle of inclination thereof, the inner peripheral edge of the template limiting the extent to which the bar is tilted with respect to the above point while the bar is moved along the inner peripheral edge of the template to provide the given geometric figure on the surface of the sheet material. By way of adjusting the inclination of the template as well as the elevation of the universal joint through which the bar slidably extends it is possible to determine the maximum dimensions, namely the maximum length and maximum width, of the geometric figure.
REFERENCES:
patent: 324395 (1885-08-01), Marichal
patent: 2048935 (1936-07-01), Klages
patent: 2095116 (1937-10-01), Albin
John Hick, Ellipsograph, Mar. 1844, Journal of Franklin Institute vol. 37, p. 153.
Aegerter Richard E.
Shepperd John W.
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