Patent ID: 7278597

Claim:
An apparatus comprising: a power rotated shaft having a polygonal cross-sectional profile with an exterior surface having at least three connected engagement surfaces; disks laterally spaced along the shaft and having a central aperture adapted to slide over the shaft and non-rotatably engage the cross-sectional profile, the central aperture being polygonal with an equal number of matching engagement surfaces, each of the disks remaining separate from and unattached to the shaft; spacers secured between the disks to maintain relative lateral spacing of the disks and form a disk assembly, the spacers being in the form of spacer sleeves spaced radially in relation to the shaft and overlying bolts, and the bolts coupling each of the disks with an adjacent disk to form disk pairings; and at least three pivotally mounted flail members circumferentially and laterally spaced in relation to each disk of the disk assembly, each of the at least three flail members having a mounting aperture, the mounting aperture overlying one of the bolts, each of the flail members being maintained in a desired lateral spacing on the one of the bolts by at least one of the spacer sleeves, and the flail members positioned between each of the disk pairings being laterally offset from the flail members positioned between an adjacent one of the disk pairings.