Geometrical instruments – Scriber – Curved line
Patent
1977-09-08
1979-05-01
Aegerter, Richard E.
Geometrical instruments
Scriber
Curved line
33 1N, 33 79R, B43L 1308
Patent
active
041516494
ABSTRACT:
A universal parallel ruler device has a head supported shiftably with its fixed posture being maintained in a desired direction along the surface of a drafting board, a straightedge mounted swivelably in a plane parallel to the surface of the drafting board, an A-D converter for converting the angular position of the straightedge relative to the base line set to any given digital amount, a detector for detecting polarity of the straightedge relative to the base line, i.e. whether the straightedge relative is inclined to the clockwise rotation side of the base line or is inclined to the counterclockwise rotation side, and a display device for displaying the digital angular position of the straightedge and the polarity relative to the base line on the basis of the signal from the A-D converter.
REFERENCES:
patent: 3339285 (1967-09-01), Baker et al.
patent: 3728551 (1973-04-01), Culver et al.
patent: 3908275 (1975-09-01), Shimizu
Aegerter Richard E.
Mutoh Industry Ltd.
Shepperd John W.
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