THE INJURED EMPLOYEE WAS ASSISTING IN CLEAN UP/ HOUSEKEEPING ACTIVITIES IN THE LOWER REVOLVING FRAME OF THE B/E 1570 DRAGLINE. BECAUSE OF THE AWKWARD POSITIONS HE WAS IN, HIS HARD HAT HAD BEEN REMOVED. AS HE MOVED FROM ONE COMPARTMENT TO ANOTHER, HIS HEAD STRUCK A SHARP CORNER OF AN OVERHEAD CABLE TRAY WHICH CAUSED AN APPROX. 3"" LACERATION.