Abstract: A fastening device for resiliently attaching adjacent panel sections together in edgewise alignment, wherein the panel sections respectively have pairs of alignable openings through peripheral edge extrusions, and the fastening device includes a pair of guide members for inserting into the openings of a first panel section and slidable locking devices for inserting into the edge extensions of a second panel section, and an elastic cord having ends secured by the locking devices and a length fed through the alignable openings and guide members.

Abstract: An improved coupler for use in assembling display frames is provided. The coupler includes a male plug, a female receptacle and a locking lever. After insertion into frame members, the plug and receptacle are engaged and locked in place. The coupler enables a frame which can be assembled and disassembled by hand and which provides a smooth, finished appearance having no outstanding protrusions.

Abstract: A portable display case formed in three sections, having hinging strips interconnecting the respective sections, the hinging strips each having a center line of perforations for facilitating bending, and also having a parallel line of perforations equally spaced on either side of the center line of perforations, the distance between the parallel lines of perforations being substantially equal to the thickness of the center section of the three sections.