Patent ID: 6126525
Filing Date: 2000-10-03
Classification: B24C

Abstract:
A blast machine for treating a surface with particulate material comprising:a) a blast wheel including an axis, a plurality of throwing blades and a central space;b) a motor for rotating the blast wheel about its axis;c) a control cage having an inlet and an outlet, said control cage positioned so that its outlet is located within the central space of the blast wheel;d) a screw conveyor disposed within said control cage;e) means for supplying particulate material to the inlet of the control cage;f) means for rotating the screw conveyor so that particulate material is transferred from the inlet, through the control cage and out said outlet; andg) a mechanism for oscillating the control cage about the axis of the blast wheel thereby to produce a widened blast pattern as the particulate material is received from said outlet and propelled by said throwing blades onto the surface to be treated.