Abstract: A handheld and readily maneuverable apparatus for grinding floor surfaces and/or cutting grooves in a floor formed of a hard material such as concrete, stone or the like is disclosed. The apparatus includes an elongated tube having a motor mounted at its upper end and a special rotatable abrasive head at its lower end. Rotation of the motor is coupled to the rotatable abrasive head via a flexible shaft that extends longitudinally through the elongated tube. In one form of the invention, the abrasive head includes a grinding disk that is oriented generally horizontally relative to the floor when the apparatus is in its operating orientation, and the operator can manually maneuver the apparatus so as to grind the floor surface.

Abstract: A sanding head for a rotary sanding machine. The sanding head includes a rotatable disk and a plurality of abraders. The disk has a bottom surface and an outer circumferential edge. The bottom surface of the disk has uniformly distributed topographical variations that extend radially inwardly from the outer edge of the disk. A plurality of conformly distributed abraders project from the bottom surface of the disk to contact the surface to be sanded.