Arrangement for attaching running rings to a rotary drum

In an arrangement for mounting first and second running rings to a drum adapted to rotate about a predetermined axis wherein bore surfaces of the running rings are held to supporting surface means carried by the drum by circumferentially spaced straps mounted laterally on at least one side of each ring, the straps having radially outer projections that extend axially toward the respective ring and have support surfaces that are directed radially inwardly toward an engagement surface on one side of the respective ring, the improvement wherein

• at least one of the engagement surfaces of each ring and the support surfaces of the straps that engage the engagement surfaces thereof extend, in the direction axially outward of said one side of the respective ring, toward the axis of rotation, and further comprising
• means for axially adjusting the support surface of each strap with respect to the respective engagement surface,
• the bore surfaces of the rings pressing locally against respective supporting surfaces of said supporting surface means.