The linkage mechanism allows the door to move between a closed position where {HEAD ~ the door} is placed against the housing and in {TAIL ~ front} of the opening to prevent access therethrough, and an opened position where the door is placed away from the opening to allow access therethrough 
The linkage mechanism allows the door to move between a closed position where { HEAD ~ the door } is placed against the housing and in { TAIL ~ front } of the opening to prevent access therethrough , and an opened position where the door is placed away from the opening to allow access therethrough
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL 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