Pipe laying method and apparatus

Details Pipe laying method and apparatus Pipe laying method and apparatus

1985-10-28

1987-07-21

Evans, F. L.

Optics: measuring and testing

Angle measuring or angular axial alignment

With screen

33286, 33293, G01B 1126

Patent

active

046814396

ABSTRACT:
A method and apparatus (10) employed to give the operator of excavating equipment a quick and accurate visual indication of the amount of excavation reguired to attain a desired grade level; wherein, the apparatus (10) comprises: a laser unit (11); a representative pipe section (12); a centerline target unit (13); and, a grade checker unit (15), whereby the coincidence of a laser beam (50) projected from the laser unit (11) and selected portions of a stationary target element (16) and an adjustable target element (27) on the centerline target unit (13) and the grade checker unit (15) respectively determines the desired grade depth.

REFERENCES:
patent: 3528747 (1970-09-01), Walsh
patent: 3572942 (1971-03-01), teKronnie et al.
patent: 3599336 (1971-08-01), Walsh
patent: 3631601 (1972-01-01), McNulty
patent: 3742581 (1973-07-01), Roodvoeis
patent: 3857639 (1974-12-01), Mason
patent: 3879132 (1975-04-01), Myeress
patent: 3907435 (1975-09-01), Roodvoets
patent: 4030832 (1977-06-01), Rando
patent: 4155648 (1979-05-01), Ferguson
patent: 4272191 (1981-06-01), Bergkvist

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