hole while the lower slot 38 of the hanger rests near the point 68 where the lower arc 48 and straight edge 50 meet this will cause one corner 70 of the locking member to point downward as shown in fig1 when all eight of the locking assemblies are in this position the panel is raised into the grid system this causes the pads 62 to compress at this point key 72 is used with the keying portion 74 inserted through the space remaining between the support 10 and the panel 16 due to pads 62 this space will also allow for ventilation of the space above the panel and shock absorbtion by the panel the keying portion is pressed against the indented edge of the locking member most effectively at indentation 40 causing the locking member to raise slightly this raising action causes the upper slot 36 of the hanger to leave the second recess 26 of the hole in the locking member the greater weight of the rear portion 66 of the locking member causes that member to rotate with the upper slot entering first recess 24 and the lower slot of the hanger coming to rest near the point 54 where two arcs of the hole meet this results in the lower corner 70 now overlying.