Tool for roughing, smoothing and polishing solid surfaces, particularly adapted for stony materials

Claim 1

Tool for roughing, smoothing and polishing solid surfaces, particularly adapted for stony materials, comprising a horizontal plate rotating about a vertical axis, a plurality of truncated-cone abrasive rollers rotatably supported by said plate in radial position with a lower generating line arranged parallel to the plate plane below said plate, and means for providing each of said rollers with a rotary motion about its own axis, characterized in that said rotary motion of the rollers has such a sense that, as a result of the combi nation of the rotary motions of the plate and the rollers and having suitably selected the ratio of the maximum to the minimum diameter of the rollers and the speeds of rotation of the plate and the rollers, all the points of said lower generating line of the rollers have substantially equal speeds of movement with respect to the surface to be worked.