Cylindric drum for surface treatments, has retainer unit including side walls to direct squeezing force in circumferential direction by wedge action between side walls of recesses and outer side walls of retainer unit

摘要

The drum has recesses that accommodate a replaceable grinding unit (6) e.g. sand paper including a retainer unit. The retainer unit forms elastic and pliable flap between grooves and outer sidewalls. A squeezing force arising on the side walls of the retainer unit is directed in a circumferential direction by wedge action between the side walls of the recesses and outer side walls of the retainer unit.