Patent ID: 8082693

Claim:
An arch shutter having a frame and comprising; an arch frame portion of predetermined arcuate shape, defining two ends, and an apex, and wherein said arch frame portion has an inner surface and an outer surface; a contoured strip on said inner surface, with generally wedge shaped formations thereon; louvres mounted in said arch frame portion having angled ends corresponding the shape of the arch frame portion; pivot pin drillings in said louvres defining pivot axes, for receiving pivot pins, and wherein said arch frame portion defines a longitudinal axis and has pivot pin openings, oblique to said axis of said arch frame portion; pin passages formed through said contoured strip coaxial with said pivot pin openings; and bevel portions formed at each end of each louvre, said bevel portions removing a portion at each said end of each louvre for providing clearance for rotation of each said louvre without interfering with said arch frame portion.