(57) Perimeter frame and flexible sheet assembly forming a substantially flat polygonal
framed panel, said assembly including a plurality of elongate frame members, each
having a generally rectangular tubular cross-section and an outwardly open longitudinal
spline groove on an exterior side thereof; a plurality of nodal connectors, each engaging
a longitudinal end of at least two adjacent ones of said plurality of elongate frame
members to form a polygonal perimeter frame, with the longitudinal spline grooves
positioned inwardly of the perimeter of said frame, a flexible sheet having a perimeter
engaged in said spline grooves and at least one elongate flexible spline fitted in
said spline grooves for retaining said flexible sheet, wherein said flexible spline
is substantially U-shaped in cross-section, having yieldable sides and a detend edge,
wherein said spline groove is inwardly contoured to offer an undercut edge and wherein
said detent edge engages behind said undercut edge for retaining said flexible sheet
and a comer assembly for joining elongate legs of a frame for mounting adjacent an
architectural opening, the comer assembly including end portions for fitment to respective
elongate legs, at least front and back surfaces extending between the end portions,
walls defining an internal cavity for receiving an insert, and an aperture through
at least one of the front and back surfaces allowing operation of the insert.
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