| 摘要 |
<p>At the intersections of metal tubes (1), clamps are provided which can be tightened on said tubes to connect them; the tubes (1) have annular depressions (12) on the outer surface, and formed correspondingly on the partial concave cylindrical surfaces (4A, 4B) are corresponding bosses (14, 16), suitable - during assembly on the tubes - to be housed in said annular depressions (12), to thereby create interferences which prevent slipping of the clamps along the tubes.</p> |
