Patent ID: 8528141

Claim:
A power-brush apparatus comprising: a housing; a brush rotatable on the housing about a brush axis and having bristles extending generally radially of the axis; means for rotating the brush in a working direction about the axis and thereby orbiting tips of the bristles about the axis; a support immediately adjacent the housing; a rigid grinding wheel mounted on the support and having an abrasive outer surface; biasing means for urging the wheel radially directly against the bristle tips; and drive means for rotating the grinding wheel about a wheel axis in a rotation direction opposite the brush direction while the brush is rotating in the brush direction about the brush axis and for displacing the outer surface of the wheel at a peripheral speed greater than a peripheral speed of the bristle tips while the wheel is urged against the bristle tips such that the grinding wheel surface primarily engages rear sides of the bristle tips turned away from the working direction.