Patent EP-0237393-B1 (EP)
IPC: F16B5/00
Filed: 1987-02-17
Granted: 1989-06-14
Abstract: 1. Connecting key between a first structural element (A) of the partition, wall, partition-panel or wall-panel type, especially made of composite material, and at least one similar second structural element (B), of which the mid-surface and that of the first structural element are concurrent along a corresponding joining line, characterized in that it comprises ; - a first plate (8) and, for each second structural element, a second plate (9) which are elongate, of substantially parallelepipedic or  prism-shaped form and made of a relatively light and rigid material capable of transmitting shearing forces and which are intended to be incorporated respectively in the said corresponding first and second structural elements (A) and (B) and stacked respectively with corresponding first plates (8) and corresponding second plates (9) of other connecting keys, each second plate (9) being arranged in relation to the first plate (8) of the corresponding connecting key, in such a way that the longitudinal axis (Y-Y) of the second plate intersects that (X-X) of the first plate (8) on the corresponding joining line (Z-Z), and that the first and second plates (8, 9) have two transverse faces (8a , 8b , 9a ) which are perpendicular to the joining line and which are substantially in the same two planes, so that the second plate (9) has a front end face confronting a plane lateral face (8c ), within hte connection, of the first plate (8), - a core (1) for each second plate (9), the said core being made of relatively light and rigid material capable of transmitting compressive forces and delimited by two plane transverse faces (2, 3) substantially in the form of a half-moon and by two convex lateral faces, of which a first (4) has a curvature less pronounced than that of the second (5) and has its generatrices perpendicular to those of the said second convex lateral face (5), the said core (1) being arranged between the first plate (8) and the corresponding second plate (9), in such a way that its two transverse faces (2, 3) are substantially in the same two planes as the transverse faces (8a , 8b , 9a ), of the said first and second plates (8, 9) that its first convex lateral face (4) is against the inner lateral face (8c ) of the first plate (8), and that its second convex lateral face (5) confronts the said frond end face of the second plate (9), and, for each core (1), - a first (6) and a seconda (7) strip of unidirectional rovings of mineral or organic fibres or filaments of hith mechanical resistance and impregnated with a polymerizable resin, the said strips (6, 7) forming two U-shaped loops which are interleaved one in the other and surround the core (1) and between the branches (6a , 6b  ; 7a , 7b ) of which the corresponding first and second plates (8, 9) are inserted in such a way that the first strip (6) extends over the two transverse face (2, 3) and the second converse lateral face (5) of the core (1), as well as over the two transverse faces (8a , 8b ) and, if appropriate, over the other plane lateral face (8d ), outside the connection, of the first plate (8) so at to be fixed to them as a result of the polymerization of the resin, and the  second strip (7) extends over the first convex lateral face (4) of the core (1) and over the two plane lateral faces of the corresponding second plate (9), so as to be fixed to them as a result of the polymerization of the resin.