Decorative arch form

Claim 1

A decorative arch form molded from a plastic material as an integral unit, said arch form including a pair of side sections, each of said side sections having two edges substantially perpendicular to one another, integral flange members extending along substantially the full length of said perpendicular edges of each of said side sections with lines of reduced thickness at the junctures of the flange members with said sections, said flange members having tapered edges, a plurality of openings arranged along the length of said flange members intermediate the width thereof, said side sections being disposed in a substantially parallel spaced relationship with said flange members of one of said side sections in alignment with said flange members of the other of said side sections, a decorative facia section connecting corresponding edges of said aligned side sections and extending from the far ends of said aligned flange members of said parallel side sections to the far ends of said flange members which are perpendicular thereto, whereby said arch form can be attached to connecting ceiling and wall panels with major surfaces of said flange members bearing against surfaces of said panels.