Combined centerline target and grade checker apparatus

Details Combined centerline target and grade checker apparatus Combined centerline target and grade checker apparatus

1987-08-27

1989-01-10

Martin, Jr., William D.

Geometrical instruments

Miscellaneous

Light direction

33286, 33293, G01C 1500

Patent

active

047963620

ABSTRACT:
A combined centerline target and grade checker apparatus (10) for use in aligning the centerline of a pipe segment (200) and checking the grade of a pipe trench (1), wherein the apparatus (10) comprises a target unit (12) and a support unit (13) which are moveably and operatively associated with a framework unit (11) such that the apparatus (10) can be used in conjuction with a laser beam generating device (100) to function both as a grade checking device and a centerline target device.

REFERENCES:
patent: 3631601 (1972-01-01), McNulty
patent: 3815250 (1974-06-01), Roodvoets et al.
patent: 3857639 (1974-12-01), Mason
patent: 3898743 (1975-08-01), Myeress
patent: 3907435 (1975-09-01), Roodvoets
patent: 4030832 (1977-06-01), Rando et al.
patent: 4272191 (1981-06-01), Bergkvist
patent: 4447962 (1984-05-01), Grosberg

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