TRIM SHOE

摘要

A composition brake shoe for use in a railway freight vehicle for reconditioning a wheel surface of a railway freight vehicle. Such brake shoe includes a brake surface having a predetermined configuration and a predetermined surface area. Such composition brake shoe consists of a first friction type composition material extending over the surface area of such composition brake shoe. A second friction type composition material is formed as a discrete insert, having a predetermined shape, and is molded into such first friction type composition material. Such second friction type composition material initially is completely embedded within such first friction type composition material. Such one surface of such insert is disposed facing such predetermined surface area of such brake surface of such composition brake shoe. Such one surface of such insert being incrementally exposed as such first friction type composition material is eroded away due to frictional engagement with such wheel tread surface during normal braking operations. Such second friction type composition material exhibits greater abrasive properties than such first friction type composition material and consists essentially of a ceramic grinding material. Such first friction type composition material extends entirely over such predetermined surface area of such brake surface of such composition brake shoe when such discrete insert has been worn away due to frictional engagement with such wheel tread surface during normal braking operations.