Rotary power slips
US4333209A · kind A · utility
8Cited by
6References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 3, 1980 |
| Grant date | Jun 8, 1982 |
| Priority date | — |
| Expiry date | Jul 3, 2000 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B19/10
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Improved rotary power slips having a housing for mounting in a rotary table of an earth drilling rig. Air is transferred from a stationary fluid source on the drilling rig to pneumatic cylinders carried by the housing when said housing is static to operate said slips. Transfer is accomplished by expansion of a perforated annular bladder thereby forming an expansive fluid duct between a stationary seal ring connected to the stationary fluid source and an air transfer plate which is rotatable with the housing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.