Patent ID: 6215883
Filing Date: 2001-04-10
Classification: H04R

Abstract:
A structural unit comprising two pairs of hinging edge members,said hinging edge members defining substantially straight hinging edges, and at least extensions of said hinging edges meeting at a vertex lying on the longitudinal axis of said structural unit, and said hinging edge members having means for mounting hinge means thereon,said hinging edge members being disposed at opposite ends of said structural unit along said longitudinal axis such that each pair of said hinging edges is disposed orthogonally with respect to the other of said pair of hinging edge members when viewed along said longitudinal axis,means for holding said two pairs of hinging edge members in rigid juxtaposition to one another,each of said hinging edges of said pair of hinging edge members being disposed at an angle of substantially 108.55.degree. from the other hinging edge of said pair, and each said hinging edge being disposed at an angle of substantially 54.27.degree. from said longitudinal axis.