Drilling apparatus for hard ground
US6839988B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 6, 2001 |
| Grant date | Jan 11, 2005 |
| Priority date | — |
| Expiry date | Aug 17, 2021 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02F3/22
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An apparatus for drilling trenches in the ground comprising a main frame having two vertical main faces, a drilling assembly comprising a support disposed at the bottom of said frame, means for causing said drilling assembly to move in vertical translation relative to said main frame by applying a predetermined force to said drilling assembly relative to said main frame, and anchoring means mounted on said main faces for anchoring the main frame to the walls of said trench. The anchoring means comprise a plurality of deformable elements secured to said main faces of the top frame, means for injecting a fluid under pressure into said inflatable elements thereby applying a force between said main frame and the walls of the trench, and means enabling said fluid under pressure to escape from said inflatable elements whereby no force is transmitted between said main frame and the walls of the trench.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.