planar faces of sign panel 46 spring strips 52 one for each leg 14 are located in these inside areas the u201c outside portions u201d between support legs 14 are designated by the reference numeral 54 and generally are located facing an edge of sign panel 46 as shown in fig2 and 3 for example the legs 14 are movable between an open or unfolded position shown at the bottom of fig2 and a folded or storage position shown in the upper corner of fig2 fig3 shows in its right hand portion a leg 14 intermediate the deployed and storage positions which correspond to notches 32 34 respectively turning now to fig1 and 5 7 a locking or detent mechanism for releasably securing the legs in either of the storage or deployment positions will now be described as shown a locking pin 60 is provided for each leg as can best be seen in fig5 7 the locking pin 60 has a generally cylindrical body 62 and an enlarged head 64 with reference to fig2 it can be seen that legs 14 are of generally hollow tubular construction with opposed side walls 14 a facing the u201c interior u201d of the support device and 14 b facing outside of the support device so as to be visible when standing to one side of the support device in the manner depicted in fig3 and 10 with reference to fig6 and 7 a hole 70 is formed in sidewall 14 a of leg 14 and is closely dimensioned with respect to the cross section of.