Manually operable depth control for trenchers
US4028822A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 20, 1976 |
| Grant date | Jun 14, 1977 |
| Priority date | — |
| Expiry date | Apr 20, 1996 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02F3/10
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The invention relates to a mechanism permitting the manual control of an trencher which is normally carried in trailing relationship to a vehicle and is pivotally mounted to the vehicle. The effective cutting depth of this type trencher is determined by the angle of the frame carrying the endless chain relative to the horizontal. An upstanding sighting bar is pivotally mounted to the frame of the trencher and means are provided for maintaining the sighting bar in a true vertical position irrespective of the angle of the frame relative to the horizontal. Additionally, the effective vertical height of the sighting bar is varied as a trigonometric function of the angle of the digging frame relative to the horizontal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.