Three-dimensional position measuring apparatus

Geometrical instruments – Gauge – Point reproducer

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Details

33 1CC, 33 1MP, 33DIG21, 356 1, 414730, 901 47, G01C 310

Patent

active

046914463

ABSTRACT:
Apparatus for determining the position of a point movable throughout a measuring volume relative to a set of reference axes includes a probe member (10) having a probe tip (11) defining the position of the movable point. The measuring probe (10) also has first and second reference points (12, 13) spaced apart from one another and having a fixed known spatial relationship with one another and with the probe tip (11). Means (16) are provided for moving the probe member (10) so that the probe tip may be positioned at any desired point within the measuring volume. At least three distance measuring equipments (15) are provided, located outside the measuring volume at fixed known positions relative to the set of reference axes and each operable to determine the distance between it and each of the reference points (12, 13) on the probe member (10). Calculating means (19) are provided to calculate from said distance measurements the position of the probe tip (11). The distance measuring equipments (15) may be laser rangefinders, with reflectors mounted on the probe member (10) at the reference points (12, 13).

REFERENCES:
patent: 4441809 (1984-04-01), Dudley et al.
patent: 4490919 (1985-01-01), Feist et al.
patent: 4568182 (1986-02-01), Modjallal
patent: 4575237 (1986-03-01), Suzuki

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