in an end which is to abut the other member the device includes wedge elements which are moved relative to one another to engage opposed internal walls of the recess in the one member so that by attaching one of the wedge elements to the other member the members are secured to one another deformable links interconnect the wedge elements to initially retain the elements in their operative positions but to subsequently deform when relative movement is produced between the elements application_number US 96321178 A description referring now to fig1 and 3 a device 1 of the invention is shown interconnecting two tubular members 2 and 3 of rectangular cross section such that the end 4 of one member 2 butts onto the body of the other member 3 the device includes three wedge elements 5 6 and 7 of which the outer elements 5 and 7 are similar and each have a single inclined or wedge surface 8 9 which are oppositely inclined to the vertical and of which the central element 6 has two oppositely inclined wedges surfaces 10 11 the surfaces 10 and 11 are intended as shown to cooperate with the surfaces 8 and 9 respectively the elements 5 and 7 are connected to a base plate 12 by way of frangible pegs 13 so that the elements normally have the position shown in fig1 since the sole function of the pegs is to temporarily retain the elements 5 and.