Cam arm centralizer
US4505614A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 15, 1982 |
| Grant date | Mar 19, 1985 |
| Priority date | — |
| Expiry date | Oct 15, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S294/902
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A centralizer for centering a marine riser in an opening in a working deck. The assembly comprises a plurality of cam arm units pivotally coupled to a portion of the working deck for pivotal movement about pivot axes parallel to the top planar surface of the deck and a plurality of hydraulic power devices for pivoting the cam arm units from a retracted position spaced away from the riser to an active position engaging the riser. Each cam arm unit includes a camming surface which increases in radius from the pivot axis thereof from a first end towards a second end, this second end engaging the riser when each unit is in the active position. Each camming surface is defined by surfaces of a plurality of rollers, two of which are located at the largest radii second end and have the same radii from the pivot axis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.