The pressing device presses {HEAD ~ the retractable unit} toward {TAIL ~ the open position} in which the unit is extended 
toward
The pressing device presses { HEAD ~ the retractable unit } toward { TAIL ~ the open position } in which the unit is extended
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH