Parking brake for subsea mining lift system
US3939991A · kind A · utility
10Cited by
2References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 13, 1974 |
| Grant date | Feb 24, 1976 |
| Priority date | — |
| Expiry date | Jun 13, 1994 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B19/06
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A parking brake for subsea mining equipment that is raised and lowered by a pipe string from a surface vessel. The brake assembly is mounted between a pair of linear lift units that alternately grip equally spaced collars on the pipe and move the pipe string in incremental steps. The brake includes a releasable yoke for engaging one of the collars. The yoke is rotatable to permit rotation of the pipe string by the brake assembly. The position of the brake is such that either drive unit may be used to position the pipe string so that a collar is engaged by the yoke of the brake assembly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.