Patent ID: 9554642
Date: 2017-01-31
CPC Classifications: A46B,B05D,B24B,B24D

Claim:
1. A power-brush apparatus comprising: a housing; a brush rotatable on the housing about a brush axis in a working direction and having bristles made of steel wire, extending generally radially of the axis, and having tips defining on rotation of the brush a circular orbit centered on the axis, the tips being engageable at a location with a workpiece surface and each being bent forward relative to the respective bristle in the working direction; a blocking element fixed relative to the housing and positioned radially inside the orbit immediately upstream between 25° and 45° relative to the axis and to the working direction of the brush from the location; and drive means for rotating the brush in a working direction about the axis relative to the housing at a predetermined angular speed in the direction and thereby orbiting the tips of the bristles about the axis such that the bristles engage the blocking element, are slowed thereby, and when released thereby snap back to engage the workpiece surface at a greater peripheral speed than the angular speed with the bent-forward bristle tips striking and hammering the workpiece surface generally perpendicularly at the location.