Geometrical instruments – Distance measuring – Of length by rolling contact
Patent
1990-11-14
1992-11-10
Will, Thomas B.
Geometrical instruments
Distance measuring
Of length by rolling contact
33779, 33780, G01B 312
Patent
active
051613131
ABSTRACT:
A hand-held instrument for measuring and calculating length, areas, peripheries and volumes is disclosed. The instrument has a housing with a tapered end giving it the overall appearance of a writing instrument. The instrument has a tracking wheel which follows a line or a curve through a revolution of the wheel. The wheel revolutions are then transmitted via an apertured shaft to an opto-electronic device which reads the angular position of the shaft and converts the wheel revolutions into electrical pulses. The pulses are inputed to a calculator which calculates length, surface areas, peripheries and volumes. A display window displays the calculator results. A caster is also disclosed to facilitate measuring curves.
REFERENCES:
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patent: 2294566 (1942-09-01), Malm et al.
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patent: 3497959 (1970-03-01), Englesman
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patent: 4253239 (1981-03-01), Houck
patent: 4377850 (1983-03-01), Simpson
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Mechanix Illustrated, "Electronic Ruler", Sep. 1979, p. 148.
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