JOINT CONSTRUCTION IN A LAMINATE OF METAL AND PLASTIC LAYER

Abstract: A joint construction in a laminate of, alternately, at least two metal layers (1-3) and at least one plastic layer (6,7) accomodated between them comprises metal layers which have at least two sections (4',5',-4''',5'''). The two sections of at least one outer metal layer (4',5') overlap one another and are fixed to one another at the location of the overlap (8) by means of an adhesive (12). Each metal layer (1-3) has overlapping sections (8-10) which are fixed to one another by an adhesive (12).

Description: Joint construction in a laminate of metal and plastic layers The invention relates to a joint construction in a laminate of, alternately, at least two metal layers and at least one plastic layer incorporated between them, which metal layers each comprise at least two sections and the two sections of at least one outer metal layer overlap one another, which two sections are fixed to one another at the location of the overlap by means of an adhesive. A joint construction of this type is disclosed in EP-A 983 141. This known joint construction has three metal layers, between which two plastic layers are accommodated. One of the outer metal layers has two sections which overlap one another in such a way that a smooth surface is obtained. The spaces next to the overlap are filled with the glue by means of which the overlapping parts of the sections are fixed to one another. The other metal layers and the plastic layers continue on at the location of the overlap. These other metal layers also consist of two sections, the leading edges of which abut one another. The outer layer thereof is provided with a glued fixing strip at the location of the leading edges, which fixing strip, together with the plastic layer located on the other side of the sections, must provide for the transfer of force between said sections. This known joint construction has a number of disadvantages. First of all the seam between the sections with leading edges abutting one another must have fairly accurately prescribed dimensions. This means that the sections themselves must have fairly accurate dimensions and also that the sections must be positioned accurately with respect to one another. A further disadvantage is that an additional joining strip has to be applied to one of the free sides of the joint construction. For these reasons a joint construction of this type is relatively inconvenient and expensive. The aim of the invention is to provide a joint construction of the type described above that can be produced more simply. Said aim is achieved in that each metal layer has overlapping sections which are fixed to one another by means of an adhesive. In the case of the joint construction according to the invention all sections can be produced and positioned with respect to one another with wide tolerance. The cost can consequently remain relativ ely low, without, however, this leading to inaccuracies or insufficient strength. In this context the joint construction can be so constructed that the overlap between two sections of a metal layer is offset with respect to the overlap between two sections of another metal layer. The outside of the joint construction is continuous and smooth if, in each metal layer, one section is straight and the other section is joggled. Such an embodiment is important when the joint construction is used in panels for aircraft and the like. The invention will be explained in more detail below with reference to an illustrative embodiment shown in the figure. The figure shows a cross-section through a joint construction according to the invention. This joint construction comprises three metal layers 1 - 3, each of which consists of two sections 4', 5'; 4", 5"; 4'", 5'". Two layers of plastic material 6, 7, which, for example, consist of a matrix of glass fibres embedded in a resin, are arranged between the metal layers 1 - 3 The sections 4' - 5'" of each of the layers 1 - 3 overlap one another at the location of an overlap 8 to 10. For this purpose the one section 4' of the outer metal layer 1 has a section 11 that is joggled on and extends to below the other section 5'. The sections 4' and 5' are glued to one another at the location of the overlap 8 by means of a layer 12 of glue. For the sections 4", 4'" of the other layers 2, 3 it is also the case that the section 11 thereof is joggled and extends to below the other section 5", 5'" of said metal layer 2 or 3, respectively. The plastic layers 6, 7 run through continuously at the location of the overlap 8 - 10.

Claims: Claims 1. Joint construction in a laminate of, alternately, at least two metal layers (1 - 3) and at least one plastic layer (6, 7) incorporated between them, which metal layers (1 - 3) each comprise at least two sections (4', 5'; 4", 5"; 4'", 5'") and the two sections (4', 5') of at least one outer metal layer (1) overlap one another (8 - 10), which two sections (4', 5') are fixed to one another at the location of the overlap (8) by means of an adhesive (6), characterised in that each metal layer (1 - 3) has overlapping sections (4', 5'; 4", 5"; 4'", 5'") which are fixed to one another by means of an adhesive (6). 2. Construction according to Claim 1, wherein the overlap (8) between two sections (4', 5') of a metal layer (1) is offset with respect to the overlap (9, 10) between two sections (4", 5"; 4'", 5'") of another metal layer (2, 3). 3. Construction according to Claim 1 or 2, wherein, in each metal layer (1, 3), one section (5', 5", 5'") is straight and the other section (4', 4", 4'") is joggled. 4. Construction according to Claim 1 , 2 or 3, wherein each plastic layer (7, 8) is joggled at the location of an overlap (8, 10). 5. Construction according to Claim 1, 2, 3 or 4, wherein each plastic layer (7, 8) is continuous at the location of an overlap (8, 10).

Inventors: ROEBROEKS GERARDUS HUBERTUS JO, ROEBROEKS, GERARDUS, HUBERTUS, JOANNES, JOZEPH
Applicants: FOKKER AEROSTRUCTURES B V, ROEBROEKS GERARDUS HUBERTUS JO, FOKKER AEROSTRUCTURES B.V., ROEBROEKS, GERARDUS, HUBERTUS, JOANNES, JOZEPH
Application year: 2001
Main classification: B32B15
IPC codes: B29C65, B29L9, B32B15, B64C1