(57) The series comprises vertical hollow uprights (1) having four essentially vertical
sides (3, 4, 5, 6) provided with a shaped appendix (13) protruding from one of said
sides and horizontal hollow cross-beams (2) having four essentially perpendicular
sides (16, 17, 18, 19) provided with a shaped appendix (24) protruding from one of
said sides. The latter constitutes a housing seat for a sliding bar (27) which can
be clamped in position and against one side (6) of an adjacent upright (2) for the
reciprocal clamping of cross-beam (2) and upright (1).
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