Assembly for locking a polished rod in a pumping wellhead
US6595278B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 17, 2002 |
| Grant date | Jul 22, 2003 |
| Priority date | — |
| Expiry date | Jan 25, 2022 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B19/06
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The assembly functions to clamp onto and frictionally engage the polished rod of a well's rod string, with sufficient force to suspend the string from the wellhead. The assembly comprises an annular body forming opposed, radial, internally threaded side openings extending from its outer circumferential surface to its central vertical bore. An externally threaded locking member is positioned in each side opening and protrudes externally. The locking members can be manually threaded inwardly to engage the polished rod. An external leverage assembly is anchored to the body and engages one of the locking members. This leverage assembly can be manually turned to tighten the locking member against the polished rod with powerful axial force to provide enhanced gripping.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.