Empty/load braking system for railroad cars and valve therefor
US5039174A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 15, 1989 |
| Grant date | Aug 13, 1991 |
| Priority date | — |
| Expiry date | Dec 15, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T8/1893
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
Empty/load braking apparatus for individually controlling the braking of the trucks of railway cars and an empty/load valve unit for such use and adapted to be mounted on each truck. The valve unit has a body with a canister as a part thereof or secured thereto with a changeover spool in the body and operable by a load sensing arm, with an air passageway extending between an inlet for receiving pressurized air from the conventional air line and an outlet for connection to a brake cylinder, with a proportional spool for controlling the air passing through the passageway, with a release spool for quick release of air from the brake cylinder upon brake release and with a check valve for preventing the entrance of air into the canister from the braking apparatus during brake release.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.