Method of folding an articulating mast
US6594960B2 · kind B2 · utility
18Cited by
11References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 18, 2001 |
| Grant date | Jul 22, 2003 |
| Priority date | — |
| Expiry date | Sep 18, 2021 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B15/00
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An articulating derrick having a back face, a pair of opposed sides with each side having at least one leg, and an open face. The back face of the derrick includes a plurality of pairs of back face cross supports. Each cross support has a first and a second opposed end. Each first end is pivotally attached to one of the legs. A bushing pivotally connects the second ends of each pair of cross supports in order to permit movement of the back face between a folded, storage position and an open position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.