Deepwater subsea lowering/lifting system
US4919393A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 3, 1989 |
| Grant date | Apr 24, 1990 |
| Priority date | — |
| Expiry date | Mar 3, 2009 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B19/002
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
Fixed and traveling cable blocks with first and second cable grip assemblies are supported adjacent the load to be lifted or lowered. A lifting/lowering cable is threaded through the cable grip assemblies before being secured to the load while a separate cable suspends the traveling block from the fixed block. By alternately closing one cable grip and opening the other, the load becomes movable upon the movement of the traveling block. Additionally, by closing the previously opened cable grip and opening the previously closed cable grip, the traveling block may be re-positioned or re-cycled while the load remains stationary. Upon such re-positioning, the lowreing/lifting operation of the load can be repeated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.