Patent ID: 7473171

Claim:
A spreader bat disk for a spreader assembly for spreading material provided thereto, the spreader assembly including a drive linkage operable to rotatably drive attachments thereto, the spreader bat disk comprising a unitary member including a generally flat web portion having top and bottom surface portions, a generally perpendicular rotation axis through approximately the center of said web portion, an outer periphery the outermost portions of which generally define a spreader disk circle when said web portion is rotated about said rotation axis, an outer portion generally inwardly adjacent said outer periphery, and an inner ring portion spaced inwardly from said outer portion and generally concentric with said spreader disk circle and having a diameter smaller than the diameter of said spreader disk circle, said top surface portion of said web portion including a plurality of generally radially spaced upwardly projecting blade elements extending outwardly on said top surface of said web portion from said inner ring portion of said web portion towards said outer portion of said web portion, said inner ring portion and said outer periphery of said web portion being generally concentrically disposed relative to the rotation axis, said web portion, being operatively connectable to the drive linkage of the spreader assembly to be rotatable about the rotation axis, said blade elements of such an operatively connected unitary member operable to engage material provided onto said top surface of said web portion for spreading and to centrifugally throw such material as said unitary member is rotated about the rotation axis, and at least one detachable concave blade mountable to the top surface of the web portion on either side of a blade element, wherein the concave blade is generally adjacent to the blade element on either the left or right side depending on the mounting configuration of the disk for either aggressive or retarded throw positioning.