Device for blasting large and bulky workpieces

Apparatus for blasting particulate material onto workpieces comprising an enclosure within which a workpiece can be positioned, said enclosure having a bottom wall with horizontally disposed rails thereon extending the length of the enclosure, a centrifugal impeller for blasting particulate material onto a workpiece in said enclosure, impeller mounting means including a carriage arranged to travel the length of the enclosure on said rails, motor means mounted on said carriage for driving the carriage on said rails, a vertical column on said carriage, an acticulated arm means pivotally connected at one end to said column for pivotal movement in a horizontal plane and connected at the other end to said centrifugal impeller wheel for supporting the latter, said other end including joints for pivotal movement of said centrifugal impeller about horizontal and vertical axes, said articulated arm means being extensible and contractible for moving the centrifugal impeller laterally away from and toward said column, and means for actuating said articulated arm means and said joints for selectively moving said centrifugal impeller to selected positioning and directing it at selected angles with respect to the workpiece.