Empty and load valve for a railroad car brake system
US4648661A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 17, 1985 |
| Grant date | Mar 10, 1987 |
| Priority date | — |
| Expiry date | Jun 17, 2005 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB61H13/30
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
An empty and load valve for a railroad car brake system is mounted on the bolster of a truck and has a sensing arm engageable with a side frame of the truck. An empty and load device is mounted on each intermediate truck of an articulated car. The device has a valve body with a manifold and an equalizing reservoir attached thereto. A first air passage extends through the valve body and a second air passage extends in the valve body from the first air passage to the equalizing reservoir. A piston assembly is reciprocable in the first air passage to open and close the passage and thereby proportion the available air supply. A plunger is movable in the valve body in response to the sensing arm to disable the piston assembly when a loaded condition is sensed. The plunger also allows a valve in the second air passage to close when a loaded condition is sensed so that all of the available air supply is supplied to the brake actuator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.