| (57) Modular elements comprising:
a) hollow metal structural members with a rectangular cross section, provided with
inserted end blocks to obtain connections at 90° and/or 180°, some of said structural
members having at least a butt male joint piece (5 or 5A) at one of their ends, while
the other have a multiple female joint piece (6 or 6A) with five operative faces;
and
b) plain (7) or respectively already equipped (7a) panels to be mounted in the spaces
defined in the inside of rectangular frames formed by four of said structural members.
Said structural members can have longitudinal outer flanges or not.
The structural members differ from one another, owing to their length, and/or to the
type of the end joint pieces, and/or to the number and position of the flanges (8).
Each butt male joint piece (5 or 5A) has butt teeth (9 and 9a) of a self-centering
type and an axial hole (10) provided with means apt to house and to link a tightening
bolt (11), while each operative face of a female joint piece (6 or 6A) comprises female
openings or seats (21 or 21A) having shapes complementary to those of the teeth (9,
9a) of the male joint piece (5 or 5A), as well as a threaded central hole (16) for
lodging the tightening or locking bolt (11).
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