Elevator load control arrangement for a computer-controlled oil drilling rig
US4139891A · kind A · utility
29Cited by
6References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 15, 1977 |
| Grant date | Feb 13, 1979 |
| Priority date | — |
| Expiry date | Mar 15, 1997 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B19/20
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A computer-controlled oil drilling derrick is characterized by apparatus for determining the load supported by a traveling block during motion thereof from a first to second position within an oil drilling rig. The apparatus is operative to output a signal functionally related to the net load on the traveling block. Further, the apparatus outputs an appropriately scaled signal functionally related to the load on the traveling block when in a substantially static condition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.