Patent ID: 6945863
Filing Date: 2005-09-20
Classification: B24D

Abstract:
1. A disc assembly for a rotary finishing tool comprising: a disc member including an inner radial portion defining a central opening; an abrasive material secured to an outer radial portion of the disc member for finishing a working surface when the disc member is rotated about a central axis of the disc member; first and second reinforcement members each including an annular plate portion located on one of opposite sides of the inner radial portion of the disc member; and a nut including internal threads for engagement with a rotary finishing tool, the nut defining a groove in an outer surface in which a portion of each of the first and second reinforcement members is located adjacent the central opening of the disc member; the annular plate portion of each of the reinforcement members extending radially outwardly beyond the outer surface of the nut and having a sufficient thickness to reinforce the inner radial portion of the disc member without any further reinforcement of the inner radial portion being provided.