Geometrical instruments – Straight-line light ray type – Rod or target
Patent
1996-03-20
1997-11-18
Will, Thomas B.
Geometrical instruments
Straight-line light ray type
Rod or target
33293, G01C 1506
Patent
active
056874863
ABSTRACT:
A grade rod is provided for measuring the depth of cut required to level a ground surface relative to a benchmark elevation location. The grade rod includes an elongated reference member having a reference mark for defining a predetermined elevation at the benchmark elevation location. An elongated extension member is slidably mounted adjacent to the reference member. The extension member has a base end for engaging the ground surface. The reference member is vertically movable relative to the extension member to permit vertical adjustment of the reference mark. A scale is carried by one of the reference member and the extension member for indicating to the user the vertical adjustment required to locate the reference mark at the predetermined elevation at any point on the ground surface. The measurement determines the depth of cut necessary for leveling the ground surface relative to the benchmark elevation location.
REFERENCES:
patent: 2642667 (1953-06-01), Smiley
patent: 3374545 (1968-03-01), Monroe
patent: 4060909 (1977-12-01), Collins et al.
patent: 4221483 (1980-09-01), Rando
patent: 4471532 (1984-09-01), Francis
patent: 5070620 (1991-12-01), Crain et al.
patent: 5457890 (1995-10-01), Mooty
Earnhardt Equipment Company
Will Thomas B.
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