Method and apparatus for accurately setting directional headings

Details Method and apparatus for accurately setting directional headings Method and apparatus for accurately setting directional headings

1982-04-12

1984-05-08

Stearns, Richard R.

Geometrical instruments

Straight-line light ray type

Alignment device

33299, 33DIG21, 248328, G01C 1500

Patent

active

044466269

ABSTRACT:
A laser transmitter is suspended from spads set in the ceiling of the mining tunnel to establish a visible light beam aligned with the desired directional heading of the tunnel. In a first embodiment, the laser transmitter is attached to a bar suspended by means of cables from the spads. In a second embodiment, the laser transmitter assembly is suspended by means of adjustable ball chains, and includes a slide plate for moving the housing in directions transverse to the light beam. The method and apparatus is usable with existing tunnel operations having spads already in place.

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