Frictionless damper
US4815574A · kind A · utility
33Cited by
5References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 21, 1987 |
| Grant date | Mar 28, 1989 |
| Priority date | — |
| Expiry date | Dec 21, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E30/30
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A frictionless hydraulic damper having a cylinder and a piston head and piston rod connected to the piston head, with the piston head dividing the cylinder into chambers on opposite sides thereof and with the piston rod extending beyond the cylinder, and with sealed bellows extending between the end walls of the cylinder and opposite sides of the piston which confine the fluid to the space between the outside of the bellows and the wall of the cylinder and thus prevent leakage of hydraulic fluid from the cylinder and eliminate the need for fluid seals on the piston rod.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.