Automatic depth control for endless chain type trencher
US4034490A · kind A · utility
31Cited by
11References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 3, 1975 |
| Grant date | Jul 12, 1977 |
| Priority date | — |
| Expiry date | Nov 3, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S37/907
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The cutting depth of an endless chain type trencher is normally determined by the angle of the frame carrying the endless chain relative to the horizontal. In accordance with this invention, the angular position of the digging frame is controlled by one or more hydraulic cylinders which, in turn, are controlled by signals derived from sensors carried by an upstanding vertical mast mounted to the frame which detects a reference plane defined by a rotating laser beam. A trigonometric correction factor to compensate for the mast mounting is included.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.