Abstract: A blast nozzle apparatus which includes a circular inlet to an entry portion with converging top and bottom surfaces and diverging side surfaces which terminate in a throat portion and an outlet portion including diverging side surfaces and top and bottom surfaces terminating in a substantially rectangular outlet opening.

Abstract: A blast head for abrasive blasting has a nozzle for directing a blast media at a surface being treated and a housing for containing the blast media after it passes through the nozzle and for facilitating recirculation of the blast media. An adjustment mechanism facilitates varying of the orientation of the nozzle with respect to the surface being treated, so as to facilitate enhanced blasting thereof.

Abstract: A pneumatic tube selector mechanism is provided for use in conjunction with an abrasive sandblast media recovery system. The tube selector selectively couples a vacuum source to any particular one of a plurality of discrete media collection locations which may take the form of tube and hopper sections. The tube selector mechanism includes an intake manifold having a multiplicity of intake ducts. A selector plate is rotationally coupled to the inlet manifold. The selector plate has an opening that is coupled to a vacuum duct which in turn is coupled to the vacuum source. A drive motor rotates the selector plate relative to the intake manifold, while a positioning mechanism controls rotation of the selector plate to selectively couple the selector plate opening to any particular one of the intake ducts. A vent valve is provided for venting the vacuum duct while the selector plate is rotated.