Slip spring with heel notch
US7082991B2 · kind B2 · utility
3Cited by
12References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 18, 2003 |
| Grant date | Aug 1, 2006 |
| Priority date | — |
| Expiry date | Jul 25, 2023 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/129
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
In order to prevent premature separation of the slip and slip spring and to simplify production of the slip casing, a self-centering spring engageable with a packer tool slip is modified according to the present invention. A groove located at a lower center of the slip below the pocket of the slip cooperates with the spring to retain the spring against the slip and is centered within the pocket without requiring partitions or further welding of lugs to retain the springs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.