Patent ID: 8113126

Claim:
A damper assembly for installation between a truck bolster and a sideframe of a three piece railroad car truck, said damper assembly having a damper body and a friction member mountable to the damper body, said damper body being adapted to seat in a damper pocket defined in the bolster, and having a spring seat for engagement by a damper biasing spring, said friction member having a friction surface for engagement with a mutually engaging surface of a wear plate when said biasing spring works against said damper body; and said friction member having at least two rotational degrees of freedom relative to said damper body when mounted thereto, said two rotational degrees of freedom permitting said friction member to rotate relative to said damper body to accommodate both pitching and yawing of the sideframe relative to the bolster when said damper assembly is installed; and said friction member includes a first portion for engagement with said damper body, and a second portion for engagement with the wear plate, and said second portion is made from a different material than said first portion.