| 发明名称 | Self-aligning pipe gripping assembly and method of making and using the same | ||
| 摘要 | A self-aligning piston is configured to selectively engage and disengage a pipe segment to permit a top drive output shaft to be coupled to the pipe segment. In one embodiment, the self-aligning piston includes a piston body configured to rotate between a first position and a second position, at least one resilient, energy-storing member coupled to the piston body, a roller assembly coupled to the piston body, and a cam disposed between the at least one resilient, energy-storing member and the roller assembly. The resilient, energy-storing member is configured to bias the piston body into the first position by rotating the roller assembly along the cam. | ||
| 申请公布号 | US9452535(B2) | 申请公布日期 | 2016.09.27 |
| 申请号 | US201313907784 | 申请日期 | 2013.05.31 |
| 申请人 | National Oilwell Varco, L.P. | 发明人 | Fox Preston R.;West Neil E.;Wells Lawrence E. |
| 分类号 | B25J15/02;B25J15/00;E21B19/06;E21B19/16 | 主分类号 | B25J15/02 |
| 代理机构 | Porter Hedges LLP | 代理人 | Forinash Derek V.;Porter Hedges LLP |
| 主权项 | 1. A self-aligning piston configured to selectively engage and disengage a pipe segment, the self-aligning piston comprising: a piston body configured to rotate between a first position and a second position; at least one resilient, energy-storing member coupled to the piston body; a roller assembly coupled to the piston body; and a cam disposed between the at least one resilient, energy-storing member and the roller assembly, wherein the resilient, energy-storing member is configured to bias the piston body into the first position by rotating the roller assembly along the cam. | ||
| 地址 | Houston TX US | ||