Device for sealing a drill hole and for discharging drillings or stripped extraction material
US7011167B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | May 15, 2001 |
| Grant date | Mar 14, 2006 |
| Priority date | — |
| Expiry date | Nov 26, 2021 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B21/015
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
In a device for sealing a bore hole and discharging drill cuttings and stripped excavation material, including a housing adapted to receive sealing elements and an opening capable of being connected to the bore hole, one side wall of the housing is provided with at least one opening for the connection of a haulage duct, wherein the housing end side facing the bore hole is equipped with a lockable, particularly screwable, sealing flange (13) for the detachable connection with a bore hole lining (11). The sealing flange (13) is rotationally and sealingly mounted within the housing and carries projections, in particular an annular brim (15) which is overlapped by a stop (14) of the housing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.