Backreamer
US5921331A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 14, 1997 |
| Grant date | Jul 13, 1999 |
| Priority date | — |
| Expiry date | Apr 14, 2017 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/60
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A directional horizontal boring backreamer for enlarging an initial bore, including three equally spaced radially extending wings attach to a common axle, equally spaced around the axle, each wing including a plurality of cutters positioned along the wing for enlarging the bore, and attached to each wing is a gusset plate welded to the axle at the juncture of the wing and axle and to the wing for added bending strength to the wing. The gusset plates also including an internal passage way from the center passage of the axle to the outer edge of the wings to support and supply a series of fluid jets supplied by fluid for assistance in cutting during the backreaming operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.