Apparatus for sensing a distended location on a drill pipe
US4327261A · kind A · utility
2Cited by
4References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 12, 1979 |
| Grant date | Apr 27, 1982 |
| Priority date | — |
| Expiry date | Jan 12, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H3/16
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for sensing a drill pipe joint is characterized by an arm pivotally moveable with respect to a drill pipe from a first, normal, position. The arm deflects a predetermined angular distance from the normal position when it comes into contact with a predetermined distended location on a drill pipe. An electrical signal is generated by a signal arrangement associated with the arm to indicate that the predetermined distended location is reached.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.