Method of operating an earth boring machine
US5289887A · kind A · utility
16Cited by
15References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 3, 1992 |
| Grant date | Mar 1, 1994 |
| Priority date | — |
| Expiry date | Apr 3, 2012 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B19/089
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
In a method of operating a ram boring machine having a rotatory-thrust drill rod an impact force is applied to the rear end of the drill rod. The boring machine includes a thrust unit and a striking tool that are combined to form a thrust/percussion aggregate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.