Ram boring machine for laying service lines without excavation
US4981181A · kind A · utility
11Cited by
6References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 28, 1989 |
| Grant date | Jan 1, 1991 |
| Priority date | — |
| Expiry date | Jul 28, 2009 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B4/145
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A ram boring machine for laying service lines in the ground without excavation, having a striking piston axially displaceable in a tubular housing and driven by means of a pressure medium via a supply hose connected to the housing, in which the supply hose is connected to the front end of the housing in the direction of advance and does not obstruct work on new pipes pushed into the passage made in the ground or drawn in simultaneously by the ram boring machine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.