Curve length measuring apparatus having caster

Details Curve length measuring apparatus having caster Curve length measuring apparatus having caster

1997-09-18

1999-08-31

Bennett, G. Bradley

Geometrical instruments

Distance measuring

Of length by rolling contact

33780, G01B 312, G01B 900

Patent

active

059437855

ABSTRACT:
A handy type curve length measuring apparatus includes a pen-holder like body, a caster rotatably connected with the body so as to rotate around a rotation axis and having a disk including slits, light emitting device, light detecting device and an indicator. When the disk rolls on a curved line, the slits provided on the disk cross the beam of light emitted from the light emitting device so as to generate pulses. The light detecting device counts the number of these pulses and the indicator displays a length of the curve based on the number of detected pulses. Since the apparatus can trace curved lines without rotating the body due to the caster mechanism, an accurate and easy measurement of length can be attained.

REFERENCES:
patent: 1835804 (1931-12-01), Morra
patent: 3494039 (1970-02-01), Porter
patent: 3577918 (1971-05-01), Wayfield
patent: 3696510 (1972-10-01), Evans, Jr.
patent: 5062063 (1991-10-01), Shimizu
patent: 5067249 (1991-11-01), Terrigno
patent: 5161313 (1992-11-01), Rijlaarsadam
patent: 5780846 (1998-07-01), Angilella et al.

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