Traveling grade controller
Abstract
Abstract A DEVICE FOR PROVIDING A GRADE READING AT ANY GIVEN INSTANT ALONG A GIVEN COURSE FOR A GRADE SENSING UNIT OF A TRAVELING MACHINE, SUCH AS PAVING MACHINE. AN ELONGATED GRADE FOLLOWER ARM OR BEAM, VERTICALLY ADJUSTABLE AT BOTH ENDS, IS TOWED INDEPENDENTLY OR BY THE TRAVELING MACHINE PROVIDING A GRADE REFERENCE POINT IN CONTACT WITH THE GRADE SENSOR DEVICE OF THE MACHINE. ONE END OF THE ARM OR BEAM IS CONTROLLED FOR ELEVATION FROM A KNOWN DATUM SUCH AS THE SURFACE JUST PREPARED. THE OPPOSITE END OF THE ARM IS CONTROLLED BY A SLOPE SENSING DEVICE MOUNTED ON THE ELONGATED GRADE FOLLOWER ARM AND IS RAISED AND LOWERED TO MAINTAIN A DESIRED SLOPE BETWEEN THE OPPOSITE ENDS OF THE FRAME. THE SLOPE CONTROLLER MAY BE PROGRAMMED ACCORDING TO A DESIRED PROFILE TO OBTAIN A VERTICAL CURVE OF CLOSE TOLERANCE, FOR INSTANCE, IN A PAVED HIGHWAY.
Inventors
- 👤 George E Long
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-08 | 1975-05-10 | 1975-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-08 | 1979-05-10 | 1979-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-08 | 1983-05-10 | 1983-11-09 | $7700.00 | Window Closed / Lapsed |