Actuator
US4286657A · kind A · utility
2Cited by
3References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 26, 1979 |
| Grant date | Sep 1, 1981 |
| Priority date | — |
| Expiry date | Dec 26, 1999 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B23/042
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
There is disclosed an actuator and a kickover tool including an actuator in which force is applied through the actuator by hydraulic means in which force due to the pressure medium in which the tool is submerged is substantially balanced across the seals of the pressure chambers and in which the force acting on the tool due to the pressure of the medium in which the tool is submerged remains balanced in the event any one of the seals becomes ineffective.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.