Abstract: The present disclosure discloses plastic composite board comprising an upper board, a lower board, and a fastener. The lower board supports the upper board. The upper board comprises a panel and a downward edge disposed on a periphery of the panel. The periphery of the panel sinks downward to define a horizontal step surface, and the downward edge extends downward from an outer edge of the horizontal step surface. The fastener comprises a buckle groove. An inner side of the buckle groove defines an opening, and the buckle groove surrounds side portions of the upper board and the lower board to fixedly clamp the upper board and the lower board together. An upper wall of the buckle groove abuts the horizontal step surface, and a top surface of the fastener is lower than a top surface of the upper board.

Abstract: The invention relates to a metal composite panel intended for construction, including at least two substantially parallel sheets (21) and (22) with at least three profiles (3) substantially parallel to each other arranged between and fastened to the sheets. The three profiles serve as separators, making it possible to separate the sheets and are arranged so that the average distance between two adjacent profiles is not necessarily uniform but suited to the local conditions of use of said panel. In order to obtain a panel having an optimal compromise between weight and performance, light alloys and, in particular, aluminum are advantageous. The composite panels are particularly useful as a floor of a rolling vehicle, as the floor, deck or ramp of a floating vehicle or as the floor of a flying vehicle.

Abstract: A hollow structural component suitable for an aircraft structure includes an inner framework of intersecting longitudinal and transverse ribs, cover sheets covering the top and bottom of the framework, and end closure sheets covering ends of the framework. The transverse ribs have slots to receive the intersecting longitudinal ribs and vice versa, so the ribs intermesh in a grid pattern. Top and bottom edges of the ribs have protruding connector tabs that are fitted into slots provided in the cover sheets. Additional connector tabs at the ends of the transverse ribs are fitted into slots in the end closure sheets. After the parts are assembled by intermeshing the longitudinal and transverse ribs and fitting the connector tabs of the ribs into the slots of the cover sheets and end closure sheets, the resulting plugged-in joints are permanently mechanically secured, e.g. by welding, brazing, soldering or adhesive bonding.

Abstract: A semi-rigid profile system for the continuous assembly of agglomerated board for the manufacturing of pieces of furniture such as closets, wardrobes, chest of drawers, or racks, including: a group of trough shaped profiles with variously shaped internal structure to be fastened onto the side edges of normal or reinforced agglomerated boards, characterized because it is embedded into the edges through one single profile structure by means of bending at the ends of the board facilitated by 45° angle cuts.

Abstract: A laminated composite material structure, in the form of a load-bearing rib of a wing of an aircraft, comprises an upper laminated portion, which is angled with respect to a middle laminated portion, and a curved corner portion being continuous with and interposed between the upper and middle portions. (The rib has a curve that connects the upper and middle portions, which are perpendicular or transverse to each other). The corner portion is in the form of a kinked portion or joggled, that is, the portion includes two regions of positive curvature (concave regions) and a region of negative curvature (convex region) interposed therebetween, whereby the formation or propagation of delaminations or cracks at the bend between the middle and upper portions, due to fuel pressure loading and low through-thickness strength, may be reduced.