| 摘要 |
Composite structures obtained by joining two or more structures of the type which presents pairs of joined tubular elements (5), whose extremity is hing ed in universal joints and in which the universal joints are substantially parallelepiped in form and present four seats of hinging corresponding to th e sides faces, in which said universal joints present grooves (6) along the sides of the face, in which are scheduled the seats to hinge the extended elements, in proximity of the edges and parallel to the same edges, that cooperate with C-sectioned fixing elements (9) to hold united two matched universal joints belonging to two structures from join.
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