Abstract: A railing construction is disclosed including an extruded aluminum post comprised of concentric inner and outer rectangular tubes. A top railing plate member has a flat plate portion overlying the upper end of the post, and the plate portion has a rectangular aperture therethrough in alignment with the inner tube of the post. An expandable fastener of rectangular cross-section is received in the aperture and inner tube to interconnect the post and plate member. The top railing includes a U-shaped cover extending across the post and releaseably interengaged with the plate member. The railing construction preferably includes a lower railing and vertical pickets in the form of rectangular tubes interconnected with the top and lower railings by means of expandable fasteners.

Abstract: Ladder structures are disclosed comprising a pair of side rails and a plurality of tubular extruded aluminum rung members extending therebetween. The opposite ends of each rung are interconnected with the corresponding side rail by means of an expandable fastener extending through an opening in the rails and into the rung end. The openings in the rails and rung are non-circular and the corresponding portions of the fastener are non-circular, whereby rotation of the fastener and rung relative to the side rail is precluded.

Abstract: A frame assembly is disclosed for supporting a panel which together with the frame provides a partition or divider structure. The frame assembly includes a pair of upright frame members of extruded aluminum and a pair of horizontal frame members of extruded aluminum. The upright members are provided with opposed pairs of polygonal openings therethrough, and the horizontal members include a tubular portion complementary in polygonal cross-section and dimension with respect to the openings in the upright members. Expandable fasteners of complementary cross-section are inserted through the openings and expanded to interconnect the horizontal and vertical members. The horizontal members include integral pairs of flanges providing opposed recesses for receiving corresponding edges of a panel supported by the frame assembly.