Patent ID: 7549379

Claim:
A side bearing for use in a railway car truck, comprising: a base section having a bottom section and a cylindrical raised section, a cup-shaped cap having a circular top section and a downwardly extending cylindrical wall section that extends into the cylindrical raised section of the base section in a telescoping fashion with a predetermined spatial gap therebetween; and at least one coil spring provided within the base section extending between the base section and the cap, the coil spring having load rating of less than about 6,000 lb/in, and a travel length from a loaded static height to a fully compressed solid height of at least ⅝″, wherein the walls of the cap and base are configured so as to retain an overlap at the loaded static height state and allow least ⅝″ of spring travel length before parts of the cap and base section abut each other and prevent further spring travel, wherein an interior portion of the cylindrical raised section of the base section and an exterior portion of the cylindrical wall section of the cap have a complementary elongated, vertically extending ridge and opening which prevent rotation of the cap within the base section, and wherein the cup-shaped cap includes a generally centrally located cut out section, and an elastomer insert within the cut out section, and the elastomer extends above the cut out section.