Abstract: The invention relates to the use of a thin flexible track of spring steel having a series of perforations therethrough for use in conjunction with a variable speed travel carriage having a carriage drive sprocket which is studded about the periphery with balls or spherical members adapted to mesh with the track perforations to drive the carriage along. By this arrangement, greater loads may be driven than was hitherto possible with known flexible-track devices requiring the use of a guide and drive track following the contour of workpiece upon which work is being carried out.

Abstract: A device for removing rivets connecting a brake lining to a brake shoe is provided. The brake shoe is supported and clamped adjacent the rivets. A rivet punch advances through the lining and shoe to expel the rivets. A brake shoe support enables the shoe to be moved relative to the rivet punch in interactive successive steps to remove all rows of rivets attaching the brake lining and brake shoe. Since rivet patterns vary, advantageously the device includes indexing means to align a row of punches with a row of rivets. Additionally, gag means are provided to disable selected punches within the row of punches to match the rivet pattern.