Self-elevating mast employing draw works
US9279267B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 23, 2014 |
| Grant date | Mar 8, 2016 |
| Priority date | — |
| Expiry date | Dec 23, 2034 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04B2001/3588
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A system comprising a support structure having a plurality of vertically extending members arranged to define a mast channel, the support structure attached to a platform having a rig floor and the support structure positioned above an opening in the rig floor; a first mast section that is attached to the support structure; a second mast section that is attached to the support structure and the first mast section; and a third mast section; wherein the system has a first arrangement in which the third mast section is located below the rig floor in a vertical position and is vertically spaced from the second mast; and wherein the system has a second arrangement in which the third mast section is attached to the second mast section and at least a portion of the third mast extends within the opening of the rig floor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.