Ram-borer apparatus
US3970157A · kind A · utility
7Cited by
9References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 30, 1973 |
| Grant date | Jul 20, 1976 |
| Priority date | — |
| Expiry date | Jul 30, 1993 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B7/26
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A ram-borer apparatus is described which comprises a tubular housing, a percussion piston which is movable axially to and fro in the housing, and a striker-tip which is arranged to slide in an axial direction relative to the housing and which bears against the housing in the working direction via a resilient member. In accordance with the invention, there is attached to the rear end of the housing a drag-sock for coupling a tube or cable, etc. to the housing, and/or an expander-cone for enlarging the bore formed by the apparatus, and/or a steering tube for steering the apparatus along a straight or preselected arcuate path.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.