Steerable soil displacement hammer
US7270197B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 19, 2001 |
| Grant date | Sep 18, 2007 |
| Priority date | — |
| Expiry date | Feb 16, 2022 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B7/26
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The invention relates to a steerable soil displacement hammer for horizontal ground boring, comprising a body that can be rotated by means of a longitudinal element, and a thrust head that is mounted rotationally in relation to the body. A rotation of the body in relation to the thrust head causes the thrust head to pivot out into an asymmetrical constellation or to pivot to a symmetrical constellation. The invention also comprises a retaining feature which provides a hold in the environment and which permits a relative rotation of the body and simultaneous pivoting of the thrust head. The soil displacement hammer can be driven forwards or backwards and the retaining feature is situated in the area of the pivot axis of the thrust head.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.