EMPLOYEE WAS DOING HOUSEKEEPING AFTER JOB WAS COMPLETE AND EE WAS MOVING A VALVE USING THE ELECTRIC HOIST TO REMOVE THE BEARING MOUNT ASSEMBLY. WHILE USING THE PULL CHAIN TO MOVE THE HOIST TOWARDS THE DOOR, THE HOOK SLIPPED CAUSING THE TOP OF THE MOUNT TO FALL TO GROUNG AND STRIKING THE LEFT FOOT.