Portable grade averaging apparatus
US4140420A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 16, 1978 |
| Grant date | Feb 20, 1979 |
| Priority date | — |
| Expiry date | Mar 16, 1998 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE01C19/008
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A 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 the averaging bar assembly being pivotally supported by a forward walking beam and the other end of the averaging bar being pivotally supported by a rear track assembly that serves as a track walking beam. A grade sensor assembly supported on one side by the road working machine contactingly engages the averaging bar assembly 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. A lifting bracket supported by the road working machine serves to lift the grade averaging apparatus into a grade clearing position while the machine is being maneuvered into a cutting position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.