| 摘要 |
<p>RAILROAD FROG HAVING MOVABLE WING RAILS A railroad frog has either a cast or rail-built point, resting on a base plate 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 wings rails have a full rail base at the hinges. Adaptor plates allow use of the frog on concrete ties.</p> |
