Jack-up rig with improved rack chock assembly
US5622452A · kind A · utility
Inventor
Key dates
| Filing date | Sep 21, 1995 |
| Grant date | Apr 22, 1997 |
| Priority date | — |
| Expiry date | Sep 21, 2015 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02B2017/0082
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The invention relates to a jack-up rig unit for offshore use which has a floatable hull supportable by one or more legs above a water line, a jack-up unit for elevating the hull and a rack chock assembly for rigidly locking the legs to the hull without introducing substantial bending moments in the legs. The rack chock assembly is laterally movable into and out of engagement with respect to the legs and, in case of a lock-up between the leg and the rack chock assembly, the invention provides for the use of a wedge member incorporated into a rack chock assembly, with a wedge member adapted for a limited sliding movement in relation to a longitudinal axis of the leg, so as to break locked engagement between the teeth of the rack chock assembly and the leg.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.