A cover unit for an industrial food mixer includes two clamshell-like covers that are hingeably mounted at the proximal ends thereof on the mixer to move in a plane that is parallel to the plane containing the top rim of the bowl in which mixing is being carried out. A splash rib is dependently mounted on each cover as is a splash edge. The splash rib and edge are in the forms of compound curves, and an arcuate cutout on one edge of each cover matches with the cutout on the other cover to define an opening through which beater or agitator elements of the mixer extend into the mixing bowl. The covers move between an open condition uncovering the bowl and a closed condition covering the bowl. A lock mechanism is used to maintain the covers in the locked condition.