Abstract: A blasting device for directed air with entrained blast media at a work surface includes a frame supporting a reciprocal valve, and an adjustable valve limit switch. A shaft is attached to the reciprocal valve at one end, and is supported via a bearing assembly at the other end with a blast nozzle mounted thereto. Rotation of the reciprocal valve causes rotation of the interconnected blast nozzle such that air with entrained blast media exiting the blast nozzle travels along a path beneath the frame. The frame is supported on wheels, and is moved along a work surface by an operator. A vacuum port is positioned adjacent the work surface for removing spent blast media with entrained debris from beneath the blasting device. The handle may be rotated from end to end for ease of operation to assure that the user may move the blasting device in either the forward or rearward direction along a work surface.

Abstract: An improved device for cleaning surfaces with plastic abrasive particles and for recovering the spent abrasive particles and debris removed from the surface in which the stream of abrasive particles is visible as it impinges against the surface being cleaned. A venturi nozzle adapted to be connected to a supply of pressurized air containing plastic abrasive particles is mounted on an end wall of a housing which forms a vacuum chamber. The housing includes a cylindrical glass sleeve which is removably mounted on a collar at its inner end and which is retained at its outer end by a retaining ring connected to the collar by a plurality of straps. A work ring is mounted on the outer end of the glass sleeve and is moved along the surface being cleaned. An exhaust tube adapted to be connected to a source of suction is connected to a rear end of the housing and the inlet end of the nozzle is located concentrically with the exhaust tube whereby the pressurized air supply line is mounted within the exhaust tube line.