Box end structure

Claim 1

A box end structure to be utilized in boxes in which two of said end structures are secured together so as to be spaced from and located parallel to one another by at least two box sides and a box bottom, in which the improvement comprises: said end structure including an integrally formed, structurally rigid housing and a solid, porous, lightweight filling, said housing being formed of a high impact strength styrene polymer and having parallel top and bottom strips located so as to be spaced from and parallel to one another and having two side strips connecting the ends of said top and bottom strips at corners into a frame structure in which the edges of all of said strips are located in two parallel planes, said housing also having wall means located within the perimeter of said frame structure connecting all of said strips to reinforce and hold said frame structure into a structural unit, said wall means including a web-like cross wall extending between said strips, and internal wall means connected to said web-like cross wall and said strips, said filling being formed of an expanded styrene polymer composition and located within the interior of said housing in contact with all of said strips and said wall means so as to completely engage and fill the interior of said frame structure so that said filling is held within said housing, said filling serving to provide flat front and rear surfaces at the sides of said frame structure in said planes.