US Patent 7380392 Guard for a header of a harvester

In a header having a movably mounted knife and a guard for shielding the moving and rotating components operating the knife, the guard preferably comprising two interconnected parts of which the first part is mounted on the header so as not to move with the knife and the second part is coupled for movement with the knife. In this way, the area shielded by the guard automatically expands and contracts with movement of the knife.