Drilling machine for digging trenches in the ground
US4800967A · kind A · utility
6Cited by
5References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 5, 1987 |
| Grant date | Jan 31, 1989 |
| Priority date | — |
| Expiry date | Aug 5, 2007 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02F3/205
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A drilling machine for digging trenches in the ground of the type comprising at least one substantially vertical support plate (3) on which are mounted two drilling drums (2) one one each side of it for rotation about an axis (4) substantially perpendicular to the plate. The downwardly facing edge surfaces of said plate have portions (13) inclined relative to the direction perpendicular to said plate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.