Dual force actuator
US4011724A · kind A · utility
7Cited by
6References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 16, 1971 |
| Grant date | Mar 15, 1977 |
| Priority date | — |
| Expiry date | Sep 16, 1991 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B2211/76
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
Actuator for selectively and sequentially providing dual pressure forces for positioning and seating fasteners and for other purposes. Air pressure is selectively applied to a first piston to apply a relatively low level of hydraulic pressure to the actuating rod and then to a second pneumatic piston to intensify the hydraulic pressure applied to the actuating rod. The actuator is caused to be extended a first distance at low force and then to be extended an additional distance at a relatively higher force. Air pressure is selectively applied to cause all pistons and the actuating rod to retract to their initial positions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.