Patent ID: 7740202

Claim:
A wing structure for an aircraft, comprising: a plurality of spars extending in a span direction; a plurality of stringers arranged between the spars and extending in the span direction; a rib extending in a chord direction to connect the spars to each other; and skins for covering upper and lower surfaces of the spars, the stringers and the rib; wherein upper and lower stringer through holes through which the stringers pass are formed on upper and lower edges of the rib; wherein a bead is formed on the rib so as to extend between the upper and lower stringer through holes which face each other in a vertical direction, said bead including a straight portion, an upper end and a lower end; and wherein each of the upper and lower ends of the bead are formed into arcuate shapes including a forwardly projecting portion extending beyond the straight portion and a rearwardly projecting portion extending beyond the straight portion so as to surround the upper and lower stringer through holes, respectively.