The pressing device is configured to press {HEAD ~ the openably closable unit} toward {TAIL ~ the open position} in which the unit is extended 
The pressing device is configured to press { HEAD ~ the openably closable unit } toward { TAIL ~ the open position } in which the unit is extended
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH