(under subclass 9.1) Device wherein the relative movement between the edge surface and the wheel is intended to enable operation of the wheel on a level, nonrail surface such as a road.
(1) Note. The flange usually retracts within the diameter of the wheel or yields to permit operation on a level, nonrail surface.
(2) Note. Flanges which yield to permit a wheel to more easily cross an obstruction are not included in this subclass unless operation on a level, nonrail surface such as a road is specified.
SEE OR SEARCH THIS CLASS, SUBCLASS:
8.5, for wheels convertible between roads and rail use by means other than a moveable flange.
