US Patent 9056381 Line trimmer/grinder system

A support pole has upper, lower and intermediate extents. A motor with a drive shaft is coupled to the lower extent of the support pole. A grinding component is coupled to the drive shaft. The grinding component includes an annular plate below, a cylindrical sleeve above and a hemispherical dome there between. The sleeve is adapted to receive the drive shaft. The annular plate has a downwardly facing abrasive surface. The dome ventilation apertures. A bushing is coupled to the drive shaft for axial securement of the dome and abrasive surface to the motor.