In this embodiment, the rope drum 18 includes an additional rope 19 which is guided over {HEAD ~ a guide roller} 20 and is attached to {TAIL ~ a stationary point} 21 
In this embodiment , the rope drum 18 includes an additional rope 19 which is guided over { HEAD ~ a guide roller } 20 and is attached to { TAIL ~ a stationary point } 21
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH