US Patent 8037667 Stalk roll for use in an agricultural harvesting machine

A stalk roll for a corn head row unit has a conical seat and a spherical seat for mounting the stalk roll on a stalk roll driveshaft of a row unit. Each row unit has a drive shaft with a corresponding conical portion and a threaded fastener with a corresponding spherical portion for capturing the stalk roll on the drive shaft between mating conical shaft and stalk roll portions toward one end and mating spherical shaft and fastener portions at the other stalk roll end.