Airless blast cleaning wheel and housing

Claim 1

In a centrifugal blast cleaning system having an impeller blade wheel axially fed with blast cleaning abrasive, an improvement comprising: a front access plate means having a feed funnel projecting therethrough for delivering abrasive to the axis of the cleaning wheel, said front access plate means being removable from the remainder of the housing by removal of fastener means, said front access plate means being of sufficiently large dimensions to permit access to and removal of the wheel and to permit access to and insertion and removal of impeller blades; a motor mounting plate for supporting a motor directly connected thereto and having a motor output shaft receiving aperture therethrough and having an output shaft directly connected to drive the impeller blade wheel and having primary and secondary seals, the secondary seal comprising a metal to metal labyrinth seal, said seals having a separation therebetween positioned between the motor shaft and the interior of the housing, such that the motor is protected from exposure to blast cleaning abrasive; in combination first and second blade mounting disks held parallel to each other by standoffs, each of said disks bearing on an innerface thereof cooperating channels in the surface thereof for receiving shoulder projections from side edges of impeller blades and supporting the shoulders of the impeller blades in the channels for rotation about the axis of the disks, each of the disks having axial apertures therethrough for feeding abrasive onto the blades when the wheel is rotated, said slots being constructed and arranged for engaging the projecting shoulders on the blades, said slots terminating prior to the circumference of the disks, and said slots thereby centrifugally securing the blades in position as the wheel is rotated; and only three interior replaceable abrasive resistant liner elements.