| 摘要 |
The frame is made from an assembly of profiles at joints (4,4') each of which has fixings (20,22,26) and articulations (8,10) around an axial pin (6,6') at each end of each profile. The pivot axes (12,14) are perpendicular to each other. The profiles can be connected succesively with concurrent orientations in pairs in the same plane. The profiles have end lugs (8) to form the hinge arms.
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