Patent ID: 8726812

Claim:
A self-steering rolling contact rocker fitting for installation as part of a wheelset to sideframe interface assembly mounted between a wheelset axle bearing and a sideframe pedestal of a railroad freight car truck, said rolling contact rocker fitting having a curved rolling contact rocking surface operable on installation to rock lengthwise relative to the sideframe, thereby to provide self-steering in the railroad car truck; said self-steering rolling contact rocker fitting being one of: (i) a bearing adapter for a railroad car truck, said bearing adapter having a pair of arches and an underside for seating on a round cylindrical casing of a railroad freight car wheelset bearing, said arches being spaced on an axis, and said rolling contact engagement surface; said surface being an upwardly facing rolling contact surface for engagement with a mating rolling contact rocking element, said rolling contact surface having a curvature that is one of (a) spherical; and (b) formed about an axis of a body of revolution, said body of revolution having an axis of revolution parallel to said axis of said arches; and (ii) a pedestal seat mountable in a sideframe pedestal of a railroad car truck sideframe, the sideframe having a long dimension defining a longitudinal axis, said pedestal seat having said rolling contact engagement surface, said surface being a rolling contact surface for engagement with a mating rolling contact element, said rolling contact surface having a curvature that is one of (a) spherical; and (b) formed about an axis of a body of revolution, said body of revolution having an axis of revolution cross-wise to said longitudinal axis.