Position control system for a construction implement such as a road grader
US5327345A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 15, 1991 |
| Grant date | Jul 5, 1994 |
| Priority date | — |
| Expiry date | Feb 15, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S2007/52014
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An ultrasonic sensor for a construction implement is disclosed which provides an indication of the position of the sensor relative to a reference surface in two dimensions. In a preferred embodiment of the invention, a pair of sensors are positioned a predetermined distance from one another to transmit and receive ultrasonic waves to measure the time it takes the waves to travel to the reference surface and be reflected back to the ultrasonic transducers. Additionally, a transducer is disclosed which detects a side lobe of a acoustic wave transmitted by an acoustic transducer whereby the velocity of said acoustic pulse may be calculated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.