Power tongs control arrangement
US4202225A · kind A · utility
68Cited by
5References
22Claims
0Family size
Inventors
Key dates
| Filing date | Apr 4, 1979 |
| Grant date | May 13, 1980 |
| Priority date | — |
| Expiry date | Apr 4, 1999 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B19/20
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Apparatus for controlling a tongs arrangement which includes a tongs lift and lift speed arrangement, a backup tong and a power driven tong, is characterized by means for generating electrical signals to lift the backup tong and power tong at a predetermined speed to a predetermined elevation, means for generating an electrical signal to close and lock the backup tong when lifted, and means for generating an electrical signal to drive the power driven tong when the backup tong is closed and locked.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.