EE WAS WORKING AT THE CHIP PLANT IN THE PACKAGING ON MON. 10-9-00 AS REQUIRED BY HIS WORK DUTIES. HE WAS WALKING UNDER THE CONVEYOR CROSS-OVER WHICH IS APPROX. 6' HIGH AND HE HIT HIS HEAD ON T HE STEEL FRAME. EE DID NOT REPORT THE INCIDENT AT THIS TIME BECAUSE HE DIDN'T FEEL HURT. NEXT FEW DAYS HIS NECK WAS STIFF. ON THUR 10-12 HE LEFTWORK AFTER 4 HRS & WENT TO OWN DR REPORTED 10/1