Patent ID: 7537513

Claim:
An apparatus for accelerating abrasive material, comprising: an impeller rotatably drivable about a rotation axis and comprising blades extending substantially radially to the rotation axis, and a lateral disk, each blade having a rear side edge on one axial side thereof and a free side edge on the opposite axial side thereof, and the lateral disk being mounted to the rear side edges of the blades; and at least one feed line for feeding abrasive material into contact with the rotating impeller, the feed line having an outlet end located at a radial spacing from the rotation axis of the impeller, the free side edges of the blades of the impeller moving cyclically angularly past the outlet opening of the feed line, and the blades having cut-outs formed in their free side edges extending axially toward their rear side edges, the cut-out in each blade being at least partially co-incident with the outlet opening of the feed line as the blade moves cyclically angularly past the outlet opening.