Pneumatic pressure operated parking brake for a railway vehicle brake system
US5794739A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 14, 1996 |
| Grant date | Aug 18, 1998 |
| Priority date | — |
| Expiry date | Jun 14, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB61H15/00
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
Air pressure actuated and hydraulic applied railway car parking brake system includes air source to actuate. A control valve receives air from source to initiate air communication. Pneumatic to hydraulic pressure intensifier receives air in first chamber therein from valve. A second intensifier chamber is connected at open first end thereof with partially open second end of first chamber. Hydraulic fluid is disposed in second chamber adjacent closed second end thereof. A force transmitting cylinder, in fluid communication with second chamber, exerts force on brake beam carrying brake shoes thereon which are brought and maintained in frictional engagement with a respective surface of tread portion of a pair of wheels during system operation. A piston member, disposed for reciprocal movement in first chamber, is linearly displaced when a first surface thereof is acted on by air communicated to intensifier. A first seal, around peripheral portion of piston, contains air communicated to intensifier in portion of first chamber located between the first surface and first end of first chamber. A stem member, disposed to move linearly in first and second chambers, is connected at first end…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.