Automatic hydraulic thruster
US4615401A · kind A · utility
68Cited by
16References
24Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 24, 1985 |
| Grant date | Oct 7, 1986 |
| Priority date | — |
| Expiry date | May 24, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/87724
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Automatic Hydraulic Thruster for hole boring including a mandrel and sleeve forming two expandable chambers with plural wall anchor means annularly disposed about the sleeve responsive to pressure differential between one chamber and the bore hole pressure and three-way valve means for automatically connecting the chambers respectively first with mandrel pressure and bore hole pressure and then vice versa.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.