Blender rotor improvements

Claim 1

In combination with a particulate material blender having an outer housing defined by a part cylindrical wall, and a rotor having a center shaft and a plurality of arms extending outwardly from the center shaft, each of said arms having an outer end, each of said arms also being of rectilinear cross section to provide a first wall that is generally planar, the improvement comprising a paddle assembly mounted at the outer end of each arm, each paddle assembly comprising a backing plate, means to removably attach the backing plate to a respective arm against its first wall, first bolt means to removably fasten the backing plate to the first wall in proximity to a portion of the part cylindrical wall as the center shaft is rotated, said backing plate being clamped against the first wall of its respective rectilinear cross section arm, and having guide members which are spaced apart to receive the arm and fit against walls of the arm that extend 90° to the first wall of the arm, said backing plate having radially extending wing portions extending outwardly from opposite sides of the arm on which it is attached to provide a substantial paddle width, a flexible wiper blade of size to extend beyond the periphery of the backing plate supported against said backing plate, and a clamp plate of substantially the same size as the backing plate fitting against a surface of the flexible wiper blade to clamp said flexible wiper blade against said backing plate, an outer edge of said flexible wiper blade being positioned outwardly of the backing plate and clamp plate and fitting closely adjacent the part cylindrical wall, said flexible wiper blade having a plurality of slots extending in radial direction with respect to the center shaft, and a plurality of sets of aligning bolt holes provided on each of the backing plates and clamp plates, the aligning bolt holes of each set on the plates aligning with a slot in the flexible wiper blade, and clamp bolt means passing through aligning bolt holes on the plates and a slot in the flexible wiper blade at a plurality of locations spaced across the flexible wiper blade surface to clamp the flexible wiper blade surface tightly against the backing plate, said clamp bolt means being separate from the means to attach the backing plate to its respective arm, said clamp bolt means being loosenable to permit the flexible wiper blade to be adjusted in radial direction and reclamped in position.