Reverse pin for sucker rod tongs
US4474088A · kind A · utility
Inventor
Key dates
| Filing date | Sep 2, 1982 |
| Grant date | Oct 2, 1984 |
| Priority date | — |
| Expiry date | Sep 2, 2002 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B19/16
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Tongs are provided for screwing together or unscrewing sucker rods for deep oil wells. A slotted ring gear is placed into a slotted annular housing plate and driven by conventional means. Heads on cage plates are moved by cam on the internal surface of the slotted ring gear. Relative movement between the cage plates carrying the head and the ring gear is governed by the position of a reversible ratchet stop which includes a beveled pin. The beveled pin is mounted in a hole through one of the cage plates and works on a slot in the ring plate. When the bevel is faced in one direction, it permits rotation of the ring gear to the cage plates in that direction, but holds the ring gear and cage plates in the matched position rotation in the other direction. The matched position is when the cams are in a neutral or withdrawn position and when the slots are aligned. The tongs are set either for making up the sucker rod or breaking it apart depending upon whether the alignment pin is set with the bevel in one direction or the opposite direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.