| 摘要 |
<p>POWER SLIP UNIT A power slip for supporting a well pipe, including a plurality of downwardly tapering slips adapted to be wedged against a pipe by engagement with a slip bowl, with the slips being mounted for movement between an active position about the pipe and a retracted position offset to a side of the pipe, and with the mechanism including power operated means for clamping the slips about the pipe independently of the camming action of the slip bowl in a relation enabling the slips to be moved into and out of the bowl by movement of the pipe.</p> |
