Patent ID: 8317564

Claim:
A children's building system comprising a building one-piece panel; said one-piece panel comprising: a panel body comprising a front face, a back face, a top edge, a bottom edge, a first side edge and a second side edge; a connecting flange extending along said first side edge, said connecting flange extending generally normally to said front and back faces; a channel member extending along said second side edge; said channel member defining at least one slot sized and shaped to slidingly receive the connecting flange of an adjacent panel to horizontally connect two panels, such that the panels are generally vertically oriented in a resulting structure; and means for vertically connecting two panels; said connecting means preventing the construction of a horizontal “floor” or “ceiling” in a structure being built from said panels; said means comprising an area at one of said top and bottom edges of said panel body and an elongate tongue defined at the other of said top and bottom edges of said panel body, said tongue having a side-to-side length, a front-to-back width and a depth; said area having a front-to-back width greater than the front-to-back width of said panel body and defining an elongate, generally horizontally extending slot having a front-to-back width sized to slidingly receive said tongue, said slot extending inwardly into said panel from said one of said top and bottom edges, said slot having a side-to-side length and a front-to-back width at least equal to the side-to-side length and front-to-back width of the tongue such that said slot of one panel can slidingly receive the tongue of a second panel; said slot being defined by a slot front wall, a slot back wall, slot side walls, and a slot end wall, such that said slot is open only along said one of said top and bottom edges.