Multiple-stage hydraulic cylinder
US5613418A · kind A · utility
30Cited by
8References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 22, 1995 |
| Grant date | Mar 25, 1997 |
| Priority date | — |
| Expiry date | Nov 22, 2015 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B2211/7057
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A multiple-stage hydraulic cylinder for shifting loads by exerting different forces over different distances, in which a hollow-piston cylinder is provided with a hollow piston rod. The hollow piston rod accommodates at least one additional long-stroke cylinder. The hollow piston rod, moreover, comprising a cylinder tube surrounding the long-stroke cylinder. Connections are provided for hydraulic fluid to move the cylinders. These connections are provided on the hollow piston rod and the long-stroke cylinder for admitting fluid to move the hollow-piston cylinder and the long-stroke cylinder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.