Method and apparatus for controlling direction of excavating mac

Details Method and apparatus for controlling direction of excavating mac Method and apparatus for controlling direction of excavating mac

1992-07-13

1994-03-22

Warden, Robert J.

Optics: measuring and testing

By alignment in lateral direction

With light detector

175 26, 405143, 299 13, 299 18, 356153, G01B 1127, E21B 4400, E21D 906

Patent

active

052969150

ABSTRACT:
There is disclosed a method and an apparatus for easily controlling the advancing direction of an excavating machine without causing the excavating machine to largely trace in a zigzag way. The direction control is done by the steps of mounting a reflector on a head portion of a shield body so as to receive a light beam directed along an imaginary reference line, mounting a target on a tail portion of the shield body so as to receive the reflected light beam from the reflector, controlling means for correcting the direction so that the reflected light beam may be irradiated at an objective position within the target, and thereby controlling the advancing direction of the excavating machine so that a subjective portion at the front end of the head portion may follow along the reference line.

REFERENCES:
patent: 4273468 (1981-06-01), Cyfka
patent: 4311411 (1982-01-01), Akesaka et al.
patent: 4392744 (1983-07-01), Tatsuhama et al.
patent: 4698491 (1987-10-01), Lysen
patent: 5052800 (1991-10-01), Mimmack et al.
patent: 5156490 (1992-10-01), Terasawa
Patent Abstracts of Japan, vol. 6, No. 179 (p. 142)(1057) Sep. 14, 1982.

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