Velocity control arrangement for a computer-controlled oil drilling rig
US4128888A · kind A · utility
23Cited by
6References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 15, 1977 |
| Grant date | Dec 5, 1978 |
| 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 rig is characterized by apparatus for comparing signals representative of the actual velocity and direction of travel of a traveling block with signals representative of predetermined minimum and maximum velocities of the traveling block and a signal representative of a predetermined direction of travel of the traveling block. Output signals are generated if the actual velocity signals are greater than the maximum velocity signal or less than the minimum velocity signal and if the direction of the traveling block deviates from the predetermined direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.