Automatic control of backhoe digging depth
US4129224A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 15, 1977 |
| Grant date | Dec 12, 1978 |
| Priority date | — |
| Expiry date | Sep 15, 1997 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02F9/26
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
In a backhoe of the type having an outreach boom horizontally pivotally mounted relative to a vehicle and an hydraulic cylinder therebetween, a downreach boom horizontally pivotally mounted on the free end of the outreach boom and an hydraulic cylinder therebetween, and a digging bucket horizontally pivotally mounted on the free end of the downreach boom and an hydraulic cylinder therebetween, apparatus is provided for respectively generating signals proportional to the angle between the outreach boom and the horizontal, the angle between the outreach boom and the downreach boom, the angle between the downreach boom and a line drawn to the digging teeth of the bucket, and an angle equal to the desired slope of the bottom of the excavation relative to the true horizontal. Such signals are combined according to a trigonometric equation to provide a continuous signal and/or visual indication to indicate the absolute elevation of the digging teeth of the backhoe bucket and the same signals are also utilized to control the hydraulic cylinders and the relationships between the aforementioned angles so that the digging teeth of the bucket move parallel to the desired slope of the bottom o…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.