After the door has been separated from the doorway , the door is translated by means of a suitable rack integral with the door, engaged by {HEAD ~ a gear wheel} which is driven through suitable gears by {TAIL ~ another rack} which in turn is driven by a rod of a fluid actuated cylinder  
After the door has been separated from the doorway , the door is translated by means of a suitable rack integral with the door , engaged by { HEAD ~ a gear wheel } which is driven through suitable gears by { TAIL ~ another rack } which in turn is driven by a rod of a fluid actuated cylinder
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH 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 REL REL OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH