Pilot head for laying pipes in the ground
US4026371A · kind A · utility
24Cited by
8References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 22, 1975 |
| Grant date | May 31, 1977 |
| Priority date | — |
| Expiry date | Dec 22, 1995 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B7/206
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
There is disclosed a pilot head used for laying small-diameter pipes such as gas, water conduits or the like precisely in position in the ground. The pilot head comprises an expandable and contractable pilot jack disposed within a pilot casing, a pivoting cylinder adapted for pivoting said pilot jack in any selected direction in a plane normal to the central axis of the pilot head, and an electromagnetic valve for operating said cylinder. The pilot head further includes a target and a clinometer both for detecting the position and posture thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.