GB272231A - Improvements in and relating to the construction of hollow aeroplane wings - Google Patents

Abstract

272,231. Rohrbach, A.., (Assignee of Rohrbach Metall-Flugzeugbau Ges.). June 5, 1926, [Convention date]. Addition to 206,514. Riveting. - A light girder structure for aircraft wings of the type described in the parent Specification comprising longitudinal girders 1, Fig. 1, transverse frames 2, and covers 3, 4, is assembled by means of special jig-supports. The longitudinal girders, comprising an apertured web plate, Fig. 6, angles and flanges, are assembled on the support shown in Fig. 3. The web carrying one pair of angles on its under side is laid on plates 12, which are loosely connected to angles 13 on brackets 11 so that they can be swung in a horizontal plane to clamp the parts; if the flanges were to be parallel, the, plates 12 would be fixed. The flanges are then slipped down the sides 14 of the brackets, and the upper angles are positioned for riveting by members similar to the plates 12 engaging between the angles under the pull of bolts passing through the apertured web. The transverse frames, which comprise a web 2, Fig. 1, with flanged apertures 16, stiffeners 17 and angles 18, are clamped to adjustable brackets 19, Fig. 6, and the longitudinal girders are clamped against the, frames, the flanges thereof engaging recesses in the frames, and the parts are riveted together. The upper cover is now riveted on, the rivets passing through the flanges both of the girders and the frames where they overlap. The assembly is then turned over either on the same support, or preferably on to a bench having uprights to enclose the assembly, and the other cover is riveted on. A bracket 27, Fig. 8, may be attached to one or both ends of the support 20, Fig. 6, and carries fittings 29, 30 engaging the girder flanges 7 and the diagonal tie-members 31. In a modification, Fig. 9, the longitudinal girders are assembled and attached to the frames at the same time on a balanced rotatable jig support which may be curved to shape the girders. The frames are clamped to brackets 35, templates 37, 38, 41 and yokes 40 being detached. The lower flange and angles of each longitudinal girder is then positioned on the plates 36; the plates 37, the web, and the plates 38 are in turn assembled and the whole clamped by holders 39. The upper flange and angles are then positioned and clamped by the yokes 40, 41, and the assembly is riveted up. The yokes 40 are removed and the upper cover fixed preparatory to turning over as before. Various sets of templates may be used for different sizes of wing.