Vertical percussion ground boring tool apparatus and method
US5540294A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 14, 1995 |
| Grant date | Jul 30, 1996 |
| Priority date | — |
| Expiry date | Feb 14, 2015 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B4/145
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A self-propelled percussion boring tool apparatus (10) and method for incrementally boring a generally vertical hole (12) to substantial depths. The boring tool (10) includes a torpedo-shaped elongated cylindrical casing (13) having a trailing pipe (22) coupled to and extending away from the back end (14) of the casing (13). In another instance, the boring tool (10) includes a trailing pipe (34) extending away from the back end (14) of the casing (13), and formed to be retained in the hole (12) after removal of the boring tool (10). In either arrangement, the present invention facilitates recovery of the boring tool (10) from bored vertical holes (12) of substantial depth.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.