Hydraulically actuated casing slip lifter with hinged wrap arm assembly
US6948904B2 · kind B2 · utility
4Cited by
24References
3Claims
0Family size
Inventors
Key dates
| Filing date | Jun 7, 2002 |
| Grant date | Sep 27, 2005 |
| Priority date | — |
| Expiry date | Oct 24, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S414/13
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A casing slip lifter includes a frame, upper and lower lift arm assemblies, at least one air cylinder connected to a pipe that rotates to pivot the arm assemblies, and a wrap arm to which the slips are attached and which is coupled to the arm assemblies by a hinge. The arm assemblies include mutually pivotable plates, one of which may be latched to enable the arm assemblies to be raised into one of two raised positions, depending on which the lower arm assembly is locked. The higher position permits the casing lifter to be used when centralizers are installed on the casing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.