Low lift, elevatable high floor drilling mast and substructure arrangement therefor
US4221088A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 2, 1979 |
| Grant date | Sep 9, 1980 |
| Priority date | — |
| Expiry date | Jan 2, 1999 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B15/00
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Low level base means extend longitudinally on the earth's surface. Drilling mast support means are positioned adjacent and pivotally connected to the base means and setback tower means are pivotally connected to the mast support means and to the base means. Drilling mast means are secured to the mast support means. Lifting frame means are connected to the drilling mast support means whereby said drilling mast support means, mast connected thereto and setback tower means may be simultaneously elevated from a reclined position to an upright position on the base means. Cable means may be secured at one end to the lifting frame means and extended around sheave means on the base means over sheave means on the lifting frame means and under sheave means on the mast support means and then connected at its other end with any suitable power source to exert a pull on the cable and elevate the mast support, mast and setback tower to an upright position on the base means where the mast may be secured in upright position. Elevatable drawworks support means is pivotally connected to the low level base means adjacent the other side of the drilling mast support means. The drawworks support means is…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.