Patent ID: 8225720

Claim:
A railway truck for supporting a car body comprising: a pair of side frames, each side frame having a bolster opening; two wheel-sets operatively connected to the side frames, each wheel-set including an axle and two wheels disposed on the axle; a bolster extending between the pair of side frames, the bolster having two end portions, each end portion of the bolster being disposed inside the bolster opening of a corresponding side frame; at least one friction plate connected to the end portions of the bolster and extending generally vertically downwardly therefrom, the at least one friction plate being disposed generally at a longitudinal center of the bolster; and two suspension assemblies operatively connecting the end portions of the bolster to the side frames, each suspension assembly including: at least one load supporting spring adapted to bias the car body upwardly; a first wedge disposed on a first side of the at least one friction plate, the first wedge having a generally vertical face and a sloping face; a first spring biasing the first wedge vertically downwardly into contact with a first frame sloping face provided in the bolster opening of the corresponding side frame such that the generally vertical face of the first wedge is pressed into contact with the at least one friction plate; a second wedge disposed on a second side of the at least one friction plate opposite the first side, the second wedge having a generally vertical face and a sloping face; and a second spring biasing the second wedge vertically downwardly into contact with a second frame sloping face provided in the bolster opening of the corresponding side frame such that the generally vertical face of the second wedge is pressed into contact with the at least one friction plate.