Ram boring machine
US4938297A · kind A · utility
34Cited by
5References
4Claims
0Family size
Inventor
Key dates
| Filing date | Jul 22, 1988 |
| Grant date | Jul 3, 1990 |
| Priority date | — |
| Expiry date | Jul 22, 2008 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B7/068
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A pressure-medium driven ram boring machine for boring in the earth, having an impact tip acted on by a percussion piston reciprocating in the machine housing, wherein the impact tip is arranged to be radially adjustable in the housing whereby controlled directional changes of the machine can be effected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.