Feed system for a rotary drill tower
US6408956B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 29, 2000 |
| Grant date | Jun 25, 2002 |
| Priority date | — |
| Expiry date | Aug 29, 2020 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B19/084
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A power feed system for a rotary drill includes a hollow tubular derrick having a powerhead connected to a flexible cable moved by a double rod hydraulic cylinder assembly. The derrick includes fixed and movable sheaving assemblies. The hydraulic rod assembly, the fixed and movable assemblies operate substantially within the derrick interior. A guide wheel on the movable sheaving contacts the derrick to maintain axial alignment of the hydraulic rods. Pivotable connections between the cable and the movable sheaves automatically adjust for cable fleet angle change, as the movable sheaves travel, maintaining axial alignment of the hydraulic rods and avoiding introducing torque into the cylinder rods.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.