Patent 7281886 was granted and assigned to Hilti on October, 2007 by the United States Patent and Trademark Office.
A suction device that is used with a power drilling tool for aspirating material removable during operation of the drilling tool, and which includes a suction head (20) displaceable relative to the drilling tool (2) in a direction opposite a drilling direction (B) of the drilling tool (2), and an aeration device (22) fixedly connected by a suction conduit with the suction head (20) for joint displacement therewith.