Geometrical instruments – Gauge – Earth profile or road grade or shrub or tree trim guide
Patent
1989-01-26
1990-04-17
Shoap, Allan N.
Geometrical instruments
Gauge
Earth profile or road grade or shrub or tree trim guide
33413, G01B 528
Patent
active
049168231
ABSTRACT:
An apparatus for facilitating measurement of street grades from a top of curb (TC) planar datum line by a single person, including a pair of hook units, each having a rigid frame structure forming a top segment for resting on a top surface of a respective curb structure, a back segment for engaging a back surface of the curb structure, and a front segment extending from the top segment downwardly and away from the back segment for balancing the unit and for engaging various contoured front curb surfaces. One of the hook units includes a ratcheted spool for tensioning a string line that is connected to the other hook unit. The string line is threaded from the spool unit through an opening in the frame structure proximate an intersection of the top and back segments, the string line extending in contact with the top of the curb under the top segment, and through a slot in the front segment, the line extending directly toward the opposite curb. At the other hook unit, the line extends through a slot in its front segment, under its top segment in contact with the top of the curb, and through a slot located proximate an intersection of its back segment with the top segment, the string line having a ring tied thereto for removably engaging an outside surface of the frame structure.
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Fulton Christopher
Shoap Allan N.
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