System including a multi-stepped nozzle assembly for back-boring an inground passageway
US4754526A · kind A · utility
14Cited by
14References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 24, 1986 |
| Grant date | Jul 5, 1988 |
| Priority date | — |
| Expiry date | Dec 24, 2006 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/26
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A nozzle assembly for enlarging an inground passageway produced by, for example, a boring device is disclosed herein. The nozzle assembly is comprised of a longitudinally extending nozzle body defining an interior cavity adapted to receive fluid under pressure from an external source and at least one arrangement of outwardly facing adjacent stepped surfaces which provide longitudinally spaced cutting jets directed normal to the movement of the boring device and nozzle assembly as the latter moves through a previously provided passageway in order to progressively enlarge the passageway.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.