| 摘要 |
A cylindrical drum has at its circumferential edge a number of recesses, each adapted for accommodating a replaceable grinding element including a retainer in which is mounted a sandpaper, support brushes and/or retainer brushes. The recesses in the cylindrical drum are made with side walls. The retainer is made with corresponding outer side walls. During use, by wedge action between the side walls of the recesses and the outer side walls of the retainer, a squeezing force on the side walls of the retainer directed in the circumferential direction arises. The retainer is designed with grooves for fastening at least one sandpaper, and the grooves extend from an upper side of the retainer and into the retainer for forming at least one elastic and pliable flap which is disposed between the grooves and at least one outer side wall. |
