Railroad spring frog
US5544848A · kind A · utility
12Cited by
5References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 6, 1995 |
| Grant date | Aug 13, 1996 |
| Priority date | — |
| Expiry date | Feb 6, 2015 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE01B2202/048
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
An improved railroad trackwork frog is provided with a relatively fixed rigid wing rail, a relatively movable spring wing rail, a base plate, and at least one roller outrigger and ramp plate assembly which is attached to the spring wing rail and to the base plate, and which functions to cause limited upwards vertical movement of the spring wing rail relative to the base plate when the spring wing rail is moved laterally relative to the rigid wing rail by the engaged wheel flange of a passing rail car.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.