A machine for sanding a floor for use with sandpaper having a smooth side and an abrasive side is disclosed and comprises a platform having a rearward end and a forward end, wheels mounted on the platform to support the rearward end for rolling movement, a sanding head, a motor and a handle. The sanding...http://www.google.es/patents/US6425813?utm_source=gb-gplus-sharePatente US6425813 - Rotary floor sander
