Top drive unit torque break-out system
US5388651A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 20, 1993 |
| Grant date | Feb 14, 1995 |
| Priority date | — |
| Expiry date | Apr 20, 2013 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B19/16
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A torque break-out system for a top drive drilling unit in a drilling rig. The torque break-out system includes a splined sub which is connected to a tubular member of the top drive drilling unit. A collar is positioned circumferentially around the splined sub. The collar has a plurality of interrupted splines in reciprocal relationship to interrupted splines on the splined sub. The collar is positioned by a pivot member having a pair of arms rotatably connected to the collar and a lift cylinder connected to the pivot member. The lift cylinder positions the pivot member between a first position in which the interrupted splines of the splined sub and the collar are not in substantial horizontal alignment and a second position in which the interrupted splines of the splined sub and the collar are in substantial horizontal alignment. The system includes a back-up wrench assembly having a vertical opening through which the drill string is received. A pair of extendible rams are attached to the back-up wrench assembly. A plurality of dies are attached to the rams. The rams are capable of extending towards the drill string so that the drill string is grippingly engaged by the plurality o…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.