Apparatus and method for improved tubular grip assurance
US5909768A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 2, 1998 |
| Grant date | Jun 8, 1999 |
| Priority date | — |
| Expiry date | May 2, 2018 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B19/07
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An apparatus for optionally gripping and releasing a tube, said apparatus having an elevator with a set of slips for optionally gripping and releasing a tube and a spider with a set of slips for optionally gripping and releasing the other end of said tube, said elevator and spider slips being in communication one to the other by pressurized conduits, said conduits forming a pressure circuit to supply pressure to release one set of slips only when the other set of slips is gripping said tube, wherein said apparatus has improved response time, said spider may be hydraulically or pneumatically actuated and said elevator maybe pneumatically operated, and wherein said spider may be flush mounted; and methods.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.