Abstract: A roofing structure, for forming for example a vault, possibly transparent or translucent, is adapted to cover a zone located between two supports generally parallel in a longitudinal direction. This structure is composed of a plurality of juxtaposed roofing plates located at one or more levels, and of hoop elements disposed transversaly between the two longitudinal supports. Each of these hoop elements is constituted by at least two elementary hoop elements comprising a lower hoop element and an upper hoop element superposed on the lower hoop element. The transverse edges of the roofing plates are engaged between the lower and upper hoop elements of each pair. The roofing structure comprises means for provoking the deformation of one of the superposed hoop elements by applying it under pressure against the other and thus effecting gripping of the roofing plates between the superposed elementary hoop elements, without any seal.

Abstract: The invention pertains to an opening skylight of great stability, more particularly of the type consisting of a fixed casing and of an opening part, the latter being itself made up of a frame and at least of one cupola, generally of transparent plastic material. The frame of the opening part comprises the combination of a first frame made up of tubular elements and of a second frame which is supported on the first one and cooperates with the latter for the attachment of the cupola or cupolas.