Change-over valve, preferably for a railway vehicle
US4010771A · kind A · utility
0Cited by
1References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 8, 1974 |
| Grant date | Mar 8, 1977 |
| Priority date | — |
| Expiry date | Jul 8, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/87233
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A change-over valve controls a source of fluid under pressure to signal at an outlet line one of two different pressures in response to applied forces such as load on a vehicle. The valve has a rotary lever load application arm receiving the applied forces to rotate it against the force of a return spring. In unloaded condition the return spring vents the outlet line to atmospheric pressure. A spring loaded valve controls the fluid pressure path to the outlet line and is operated as the applied load force increases to provide fluid under pressure to the outlet line.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.