| 摘要 |
1. Junction piece for joining by bringing them together, two tubular (14-14') cut with a predetermined angle, comprising a double square (1) with knobs (10), a symetrical exterior one (2), truncated on the corner and having spacing means (4) defining a tightening direction, the symetrical interior other (5), truncated on the corner for supporting said spacing means (4), each branch of the double square being received in the tubular cavity (15-15') of the corresponding beam (14-14') of which the external wall presente an aperture (18-18') into which can penetrate the associated knob for the bringing together and the joining of said beams, the exterior square (2) having internal facets near the end each of its branches (7), the plane of said facets being substantially parallel with the tightening direction (8), the interior square (5) being rigid and in contact by its free ends with said facets, each branch of the double square having a knob (10) projecting from the external face (12) of the exterior square (2), the bearing contact with the external wall of the associated tubular cavity being ensured by said external face (12) of the exterior square (2), characterized in that the exterior square is equally rigid and the interior square (5) has a boss (11) projecting on its internal face (13), ensuring a bearing contact with the internal wall of the tubular cavity, the range of movement of the interior square (5) within the exterior square (2) being upwardly limited by a recess lip (20) provided at the end of each branch (7) of the exterior square (2). |
