Railroad switch machine
US4428552A · kind A · utility
18Cited by
10References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 4, 1981 |
| Grant date | Jan 31, 1984 |
| Priority date | — |
| Expiry date | May 4, 2001 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB61L5/045
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A high-speed switch machine for actuating railroad switch points. The machine has an electric motor which drives a hydraulic pump. The pump supplies pressure fluid to a hydraulic cylinder adapted to move the switch points from an initial to a second limit position. A four-way, two-position hydraulic control valve directs fluid to the cylinder such that the cylinder automatically operates in an extension and retraction cycle. The uni-directional motor and two-position control valve minimize response times of the actuating components so that the switch points are thrown in a short time period.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.