Rotary power slip assembly
US3999260A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 9, 1976 |
| Grant date | Dec 28, 1976 |
| Priority date | — |
| Expiry date | Jan 9, 1996 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B19/10
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A pneumatically operated rotary power slip assembly which is mountable in a rotary drilling table. It includes a stationary housing having an annular opening therethrough adapted for mounting generally coaxially with the pipe opening in the rotary table. The stationary housing has a conduit therein for transmitting pressurized fluid. The assembly includes a rotary housing having an annular opening therethrough, which housing is adapted for mounting generally coaxially with the opening in the rotary table and for rotation therewith. The stationary housing is provided with a pair of inflatable annular seals which, together with the rotary housing, form two axially spaced apart annular ducts between said housings upon inflation of the seals. The rotary housing supports at least one generally radially extendable and retractable slip, which slip is arranged to engage a pipe inserted through the rotary housing in the radially inwardly extended position and for releasing the pipe in the radially outwardly retracted position. At least one pneumatic cylinder is mounted in the rotary housing and arranged for moving the slips radially inwardly and outwardly upon actuation thereof. Additional …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.