Railroad frog having movable wing rails
US4637578A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 26, 1983 |
| Grant date | Jan 20, 1987 |
| Priority date | — |
| Expiry date | Oct 26, 2003 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE01B7/14
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A railroad frog has either a cast or rail-built point, resting on a baseplate which is fastened to ties. A pair of heel rails are attached to the point, to the ties and to traffic rails. A pair of movable wing rails extend from the toe of the frog to a location adjacent the point of the frog. At the frog point an open wing rail forms a flangeway with the point, while the other, closed wing rail cooperates with the point to form a continuous tread surface through the frog. The wing rails are alternately thrown between the open and closed positions by an actuator. A series of stops define the open wing rail position and act to hold down the open wing rail. The wing rails have hinges which allow them to move. The wing rails have a full rail base at the hinges. Adaptor plates allow use of the frog on concrete ties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.