US Patent 7886510 Stalk roll

A stalk roll to be mounted upon a stalk roll drive shaft of a corn harvesting header in one embodiment comprises a cylindrical shell, at least four flutes affixed to and extending radially from the cylindrical shell, wherein the flutes are arranged in a first group and a second group, wherein the first group and the second group contain an equal number of said flutes, and wherein a peripheral distance between the first group and the second group is greater than a peripheral distance between the flutes within either the first group or the second group.