Title: Grade averaging apparatus

Abstract: An improved portable grade averaging apparatus comprising an averaging bar assembly that serves as an elevation control reference for a track supported road working machine. One end of an averaging bar member is pivotally supported by a forward steering drive track assembly that serves as a forward walking beam, and the other end of the averaging bar member is pivotally supported by a rear track assembly that serves as a rear walking beam. A grade sensor assembly supported on one side by the road working machine contactingly engages the averaging bar member for directing the elevation of one side of the road working machine to establish the elevation of a working tool supported by the road working machine.

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Inventors: Swisher, Jr., George W. (Oklahoma City, OK, US)
Steele, Thomas L. (Oklahoma City, OK, US)

Application Number: 946606
Filing Date: 1978-09-28
Publication_date: 1980-07-22
Assignee: CMI Corporation (Oklahoma City, OK)
Primary Class(es): 404/84.2 180/41, 299/1.5
Other Classes:
US Patent Ref:

2962979	Dec, 1960	McCormick	404/84.
3272099	Sep, 1966	Drake	404/84.
3323427	Jun, 1967	Schrimper	404/84.
3414327	Dec, 1968	Austin	299/1.
3595144	Jul, 1971	Rink	404/84.
3771892	Nov, 1973	Munyon	404/84.
3807887	Apr, 1974	Tate	404/84.
3811787	May, 1974	Beaty	404/84.
3846035	Nov, 1974	Davin	404/84.
3879149	Apr, 1975	Smith	404/84.
4029165	Jun, 1975	Miller	404/84.

Other Refs:
Primary Examiner: Byers, Jr., Nile C.
Assistant Examiner:
Attorney: Dunlap, Codding & McCarthy