Patent ID: 7717772
Filing Date: 2010-05-18
Classification: B24B

Abstract:
1. A polishing tool comprising: an oscillating shaft configured to oscillate about an axis thereof within a predetermined angular range and having a lower end; three triangular plate-shaped polishing members, including first, second and third triangular plate-shaped polishing members, each triangular plate-shaped polishing member having a lower surface serving as a polishing surface; and, an oscillation transmitting member including wherein each connecting portion extends from a respective side of the base, axially away from and radially outward relative to the oscillation shaft so that the polishing member holding portions are position axially apart from the base and positioned in a plane normal to an axial direction of the oscillation shaft, wherein the first, second and third polishing member holding portions have first, second and third lower sides, respectively, on which the first, second and third triangular polishing members are attached, respectively, and each triangular polishing member has two sides thereof extending parallel with and outside sides of the polishing member holding portion to which the triangular polishing member is attached, wherein the oscillation transmitting member is formed from a sheet-shaped spring member so that the oscillation shaft is capable of being inclined relative to one of the polishing members and the polishing surface of the one of the polishing members to which the oscillation shaft is inclined maintains surface contact with a surface to be polished; and wherein each polishing member has cushioning properties and an edge portion positioned radially outside a radially outer edge of the polishing member holding portion with respect to the oscillating shaft.