Multi-stage hydraulic actuator
US5247872A · kind A · utility
10Cited by
4References
14Claims
0Family size
Assignees
Inventor
Key dates
| Filing date | Dec 7, 1992 |
| Grant date | Sep 28, 1993 |
| Priority date | — |
| Expiry date | Dec 7, 2012 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21D24/14
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A multi-stage hydraulic actuator including a cylinder body having an outer cylinder and an inner cylinder provided in the outer cylinder, first and second pistons inserted in the outer cylinder to independently move and provided with first and second working members, and third and fourth pistons inserted in the inner cylinder to independently move and provided with third and fourth working members.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.