Geometrical instruments – Miscellaneous – Light direction
Patent
1978-03-06
1981-01-13
Aegerter, Richard E.
Geometrical instruments
Miscellaneous
Light direction
33419, 33450, B43L 700
Patent
active
042441056
ABSTRACT:
A digital scaler for measuring and displaying a distance on a drawing surface comprising a first triangle with a verticle straight edge and a second triangle with a horizontal straight edge slightably engaged with the first triangle along the vertical straight edge. A drive in the form of a drive wheel and pulleys are connected between the first and second triangles and can be activated to displace the second triangle with its horizontal straight edge along the vertical straight edge of the first triangle. A horizontal displacement measuring device is connected to the first triangle and engageable with the drawing surface to measure the linear displacement of the first triangle when it is drawn horizontally across the drawing surface. A vertical displacement measuring device is connected to the drive wheel and measures the displacement of the second triangle along the vertical straight edge of the first triangle when the drive wheel is rotated. An electronic digital display can be connected to the horizontal and vertical displacement measuring devices to display the horizontal and vertical displacements of the vertical and horizontal straight edges respectively.
REFERENCES:
patent: 1010664 (1911-12-01), Melick
patent: 1057583 (1913-04-01), Schenk
patent: 1213664 (1917-01-01), McCuaig et al.
patent: 3449833 (1969-06-01), Dzula
patent: 3688410 (1972-09-01), Zeidler et al.
patent: 3757422 (1973-09-01), Frydenberg
patent: 3973326 (1976-08-01), Gallacher et al.
Aegerter Richard E.
Shepperd John W.
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