Geometrical instruments – Straightedge type – Square and sliding nonpivotal straightedge
Patent
1979-02-05
1980-12-09
Phillips, Charles E.
Geometrical instruments
Straightedge type
Square and sliding nonpivotal straightedge
33 1M, 33125C, 33141E, B43L 700
Patent
active
042376173
ABSTRACT:
A digital drafting machine for measuring and displaying a distance on a drafting surface comprising a first triangle with a vertical straight edge and a second triangle with a horizontal straight edge slidably engaged with the first triangle along the vertical straight edge. A drive in the form of a drive wheel and pulleys with a cable rapped therearound disposed in the first triangle with the cable connected to the second triangle, the drive wheel being rotatable to displace the second triangle with its horizontal straight edge along the vertical straight edge of the first triangle. An optical horizontal displacement measuring device is connected to the first triangle and includes a light sensor for sensing the passing of the drawing surface to measure the linear displacement of the first triangle when it is drawn horizontally across the drawing surface. An optical vertical displacement measuring device is connected to the second triangle and includes a light sensor for sensing the relative movement between the second triangle and first triangle and measuring 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 is connected to the horizontal and vertical displacement measuring devices to display the horizontal and vertical displacements of the vertical and horizonal 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.
patent: 4008523 (1977-02-01), von Voros
Michalos Constantine A.
Michalos Peter C.
Phillips Charles E.
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