Geometrical instruments – Straightedge type – Base attached
Patent
1979-06-28
1981-01-27
Phillips, Charles E.
Geometrical instruments
Straightedge type
Base attached
33 1M, 33125C, 33141R, B43L 1302
Patent
active
042467039
ABSTRACT:
Disclosed is an electronic integral drafting instrument which measures its own linear displacement and displays any desired multiple or submultiple of the actual displacement. The instrument includes a straightedged plate which houses: a displacement sensor with a driving wheel which projects beneath the plate, an electronic up-down counter and calculator type circuit, a scale factor keyboard, an electronic digital display, and a sensor which detects and annunciates if the displacement sensor driving wheel does not make proper contact with the drawing media. One embodiment of the invention is easily attached to conventional drafting machines as a replacement for regular straightedges and scales. A second embodiment of the invention may be used without a drafting machine. The leading straightedge of the instrument can be lifted or lowered into contact with the drawing media. An extension straightedge may be attached to the leading edge of the instrument. The instrument provides readout and storage of linear displacement in any unit system and any scale factor.
REFERENCES:
patent: 3728551 (1973-04-01), Culver et al.
patent: 4069588 (1978-01-01), Hoppe
Electronic Ruler, Mechanix, Ill. 9/79, p. 148.
Kier Philip H.
Phillips Charles E.
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