Piston unit
US4342884A · kind A · utility
26Cited by
8References
18Claims
0Family size
Inventors
Key dates
| Filing date | Jun 11, 1979 |
| Grant date | Aug 3, 1982 |
| Priority date | — |
| Expiry date | Jun 11, 1999 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16F2230/10
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A small-sized differential piston unit is disclosed. The piston unit has a cylinder filled with liquid medium and a piston slideably mounted in the cylinder. An operation rod is operatively connected to said piston. An improved sealing member consisting of a membrane is used to completely seal the liquid medium in the cylinder. Control means is provided for imparting fluid resistance caused by the liquid medium to the piston differently between its forward movement and backward movement in the cylinder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.