Patent ID: 7770314

Claim:
An outdoor advertising system to support and selectively display an inside panel assembly or an outside panel assembly comprising an outer frame having a plurality of elongated interior support members attached thereto, a plurality of stringer coupling assemblies to couple a plurality of stringer members to the plurality of interior support members and a plurality of attachment panel assemblies to attach the inside panel assembly and the outside panel assembly to said outer frame wherein each said stringer coupling assembly comprises an upper stringer clamp and a lower stringer support, said upper stringer clamp comprises a bracket and a resilient stringer clip, said bracket comprises a stringer plate attached to each corresponding elongated interior support member disposed to engage the top portion of each corresponding stringer member and said resilient stringer clip comprises an offset spacer element extending outwardly from the lower portion of said stringer plate having a bias member depending downwardly therefrom angled inwardly to create an inward bias against said corresponding stringer member terminating in a clamping surface to clamp each corresponding stringer member to each said interior support member.