A hook is slidably mounted on the frame to engage {HEAD ~ a slat} fixed to {TAIL ~ the floor} adjacent a wall edge 
fixed to
A hook is slidably mounted on the frame to engage { HEAD ~ a slat } fixed to { TAIL ~ the floor } adjacent a wall edge
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH