Background Art Reticular structures are known, constituting the frame of furnishing items, in which metal cross members and uprights are mutually welded.

The furnishing items thereby obtained have the drawback of not being able to undergo any modification or enlargement in any way, to meet new requirements.

It is also known that, to realise reticular structures with a greater degree of modularity and versatility, the uprights and cross members can be mutually connected through the use of particular clamps, which have appropriate seats for the insertion of the cross members and of the uprights themselves. The clamps are then tightened by means of appropriate tightening means, for instance screws and nuts.

This type of complex of elements too, however, is not free from drawbacks. In particular, the assembly and disassembly of even a single element is not easy. Moreover, the set is not stable until the clamp is completely tightened. The number of uprights and cross members concurring in a single clamp is such as to make it impossible to replace or remove an individual piece without rendering the entire structure unstable. The structure is stable only when the clamps are fully tightened.

It is practically impossible to obtain structures with complicated geometric shapes in a rapid and simple manner.

Multiple-way connecting elements are known, presenting a seat for each way, suitable for pressure insertion of the uprights and cross members. Although assembly of the

elements is thereby simplified, this solution is also not free from drawbacks.

It is generally impossible to obtain complicated geometric shapes. Given the characteristics of the connecting elements, the structure cannot be stable, even after its completion.

All known systems for composing furnishing items generally present the limit of needing to be constructed specifically for the particular furnishing item desired or for its particular geometric shape. Therefore, in order to obtain furnishing items of various kinds, one is forced to construct many different types of elements.

Disclosure of Invention The aim of the present invention is to overcome the drawbacks described above, making available a complex of elements for composing furnishing items which comprises few simple elements and allows to obtain, simply and rapidly, stable and easily modifiable structures.

Another aim of the present invention is to make available a complex of elements which allows to obtain geometrically complex structures, easily adaptable to changing requirements.

A further aim of the present invention is to make available a complex of elements which allows to obtain vibration-proof modular structures to support stereophonic sets, acoustic diffusers and the like.

These aims and others besides, which shall become more readily apparent in the course of the description that follows, are achieved, in accordance with the present invention, by a complex of elements for composing furnishing items as set out in the enclosed claims.

Description of the Drawings The invention is described in greater detail hereafter with the aid of the drawings,

which show an embodiment provided purely by way of non limiting example.

-Figure 1 shows an exploded perspective view of a first possible combination of the complex of elements of the present invention.

-Figure 2b and 2a show a schematic plan view respectively of the combination of cross members of Figure 1 and of a possible alternative thereto.

-Figure 3 shows an exploded perspective view of a second possible combination of the complex of elements of the present invention.

-Figure 4 shows a partial exploded longitudinal section of an element of the complex of the present invention.

-Figure 5 shows a partial side view of the element shown in Figure 4, once it is assembled.

-Figure 6 shows a particular type of cross member comprised in the complex of elements of the present invention.

-Figures 7a, 7b, 7c, 7d show the axial sections of different types of cross member comprised in the complex of elements of the present invention.

-Figures 8a and 8b show two different combination possibilities for the cross members.

-Figure 9 shows the plan development of the combination shown in Figure 3.

Description of the Illustrative Embodiments With reference to the figures, the complex of elements for composing furnishing items comprises at least a plurality of uprights I and at least a plurality of cross members 2 connectable to said uprights 1.

The uprights 1 and the cross members 2 are preferably made of metallic material. In particular the metal can be aluminium or an aluminium-based alloy, to provide the structure with solidity and lightness.

Each cross member 2 has at least a first and a second indentation 4,5 substantially

transverse to the main development of the cross member 2 in order mutually to fix the cross members 2.

In a preferred embodiment of the present invention, shown in Figures 7a, 7b, 7c, 7d, the indentations 4,5 involve half the section of the cross member 2 in order not to determine differences in height between the surfaces of two mutually fixed cross members 2.

By combining cross members 2 of various lengths, with indentations 4,5 having various axial orientations relative to a longitudinal axis 21 of the cross members 2, it is thus easy to obtain planar reticular structure with complicated geometric shape.

A particular type of cross member 2, as shown in Figures 1, 2a and 2b, has its first and its second indentation 4,5 axially inclined by a predetermined angle relative to the longitudinal axis 21 of the cross member 2 and converging. In this way, depending on the value of this angle, as well as on the number and length of the cross members 2 in use, it is possible to obtain polygons and broken lines of any kind.

In the examples shown in Figures 1, 2 and 2b, the angle is equal to 60° and the cross members 2 have the same length. It is thus possible to obtain closed figures, such as equilateral triangles (as shown in the figures), regular hexagons, regular broken lines and all possible combinations.

A second type of cross member 2, as shown in Figures 3,8a and 8b, has its first and second indentation 4,5 axially perpendicular to the longitudinal axis 21 of the cross member 2. It is thus possible to obtain squares (as shown in the figures), rectangles, broken lines, or saw tooth structures and all possible combinations.

A third type of cross member 2, shown in Figure 6, has at least a shaped indentation 7 identified by the intersection of an indentation axially perpendicular to the longitudinal axis 21 of the cross member 2 with an indentation that is axially inclined relative to the same axis. The shaped indentation 7 allows, as shown in the figure, the fixed coupling of two cross members 2 according to any one of the inclinations among those of the cross

members 2 shown in dashed lines in Figure 6.

Advantageously, the combination of these three types of cross members 2 allows for an enormous versatility in the creation of geometric shapes.

In a preferred embodiment of the invention, as shown in Figure 7a and 7d, the first and the second indentation 4,5 are oriented towards opposite faces of an axial plane of the cross member 2. This allows to construct polygons having any number of sides using only this type of cross member 2 provided with indentations 4,5 having the appropriate axial orientation. Moreover, once closed, the polygon tends to remain stable also without the aid of locking or tightening means, due to the alternation of fixed couplings to opposite indentations 4,5. This allows for easy handling of the structure during its assembly. This disposition is shown in Figures 1 and 2a for the case of an equilateral triangle, and in Figure 8b in the case of the square.

In an alternative embodiment of the invention, shown in Figures 7b and 7c, the first and the second indentations 4,5 are oriented towards a same face of an axial plane of the cross member 2 itself. Using only this type of cross member 2 it is possible to obtain regular polygons with an even number of sides, as shown in Figure 8a in the case of the square. To obtain polygons with an odd number of sides it is necessary, to close the figure, to use a cross member 2 having the first and the second indentations 4,5 on opposite sides, as shown in Figure 2 in the case of the equilateral triangle. The closed polygon thus obtained is not stable without appropriate fastening or tightening means.

A fourth type of cross member 2, whereof some examples are shown in Figures 3,7c, 7d, is provided with at least a third indentation 6 situated in an intermediate position between the first and the second indentation 4,5. The third indentation 6 can be oriented in any direction, to allow particular crossings or branches to the reticular structure obtainable by coupling the cross members 2. In particular, using cross members 2 of the type shown in Figure 7d, having the second indentation 5 and the third indentation 6 on the same side and the first indentation 4 on the opposite side, together with two cross members

2 of the type shown in Figure 7c and having the three indentations 4,5,6 all on the same side, it is possible to obtain planar reticular structures of the type shown in Figure 9. Figure 3 shows the central part of the structure of Figure 9.

The same structure could be obtained without using the two cross members 2 of the type shown in Figure 7c.

To extend the structure of the item to be composed in a direction orthogonal or transverse to the laying plane of a set of coupled cross members 2, the uprights 1 are used.

The uprights 1 can be engaged to the cross members 2 at least in correspondence with the indentations 4,5,6,7.

Conveniently, each upright I has at least at a first extremity 11 a pin 31 positioned coaxially to the upright 1 itself. The pin 31 can be engaged at least in a through hole 25 obtained in correspondence with each indentation 4,5,6,7 of the related cross members 2. Moreover, the upright 1 has at least at its second extremity 12, first coupling means 8 for at least the pin 31 of a consecutive upright 1. In this way, as shown in Figure 3, it is possible to connect and lock two uprights I to each other and to two related cross members 2 in correspondence with a fixed coupling. In each node involved by the connection of the uprights 1, therefore, the structure is consolidated and fastened in a removable manner with no need for additional connecting elements.

In a preferred embodiment of the invention, the first coupling means 8 comprise a nut screw of pre-determined length, whereon can be engaged a thread obtained on the pin 31.

Thus, the structure is assembled simply by screwing the pin 31 onto the upright l, inserting the pin 31 into the through holes 25 of two cross members 2 fixed to each other and screwing the consecutive upright 2 onto the pin 31.

The coupling means can also be quick-coupling means, such as spring-loaded couplings or the like. In this case, the extremities of the pin 31 shall be provided with the appropriately fitted out head.

Moreover, advantageously, the pin 31 is removably engaged at least to the first

extremity 11 of the upright I through coupling means identical to the first coupling means 8 present at the second extremity 12. In this way, the pin 31 can be used as a stand-alone connecting element.

The first and the second extremity 11, 12 of the upright 1 have each at least a seat 10 for the insertion of a cushioning element 13. This produces a coupling between the elements of the complex of the invention which does not damage its surface and tends to dampen the acoustic resonance particularly present in reticular structures. Preferably, the cushioning element 13 is a ring made of flexible plastic material or rubber (also called"o"- ring).

Advantageously, moreover, in a particular embodiment of the invention, each cross member 2 comprises second coupling means 9 to allow the connection of the upright 1 in a different position from that of the indentations 4,5,6,7 as shown in Figure 1. This allows easily to obtain reticular structures having multiple planes of different horizontal dimensions, nesting one in the other.

The second coupling means 9 are preferably of the same type as the first coupling means 8.

Advantageously, the complex of elements of the present invention comprises at least a junction element 32. Said junction element 32 can be engaged on the pin 31, for instance by means of a through holes, and can be interposed at least between each upright I and the related cross member 2. The face of said junction element 32 in contact with the cross member 2 is counter-shaped relative to the surface of the cross member 2 itself. This allows to join uprights I and cross members 2 and, by breaking up the structure, it reduces its resonance. Advantageously, said junction element 32 is made of metallic material, preferably brass or bronze, differing from the material whereof uprights I and cross members 2 are made, also for purposes of sound damping.

The junction element 32 has on its own face opposite to the surface of the cross member 2 at least a seat 33 for the insertion of a cushioning element 13.

Conveniently, to achieve the support of the reticular structure on the floor or to determine the bearing points for a possible plane made of glass or other material, the complex of elements of the present invention further comprises at least three support elements 15 identifying a bearing plane in mutual combination.

Each of these support elements 15 comprises at least: on one side a first projection 16 for removable connection to the first coupling means 8, on the other side at least a seat 17 for the insertion of a cushioning element 18.

As shown in Figure 3, the support elements 15 can be coupled, through the engagement of the first projection 16 in the first coupling means 8, to one of the two extremities 11, 12 of the upright 1 to determine the bearing of the structure on the floor, or the bearing of a glass plane on the uprights 1 in correspondence with a summit of the structure or on a plane internal thereto determined by the uprights I themselves. The cushioning element 18, in this case, acts to preserve structure, floor and plane from any damages.

Also as shown in Figure 3, the support elements 15 can be coupled, through the first projection 16, to the second coupling means 9, to define a bearing plane in correspondence with the surface of the cross members 2.

Advantageously, each support element 15 is constituted by at least two identical pieces 15a, 15b, described as parts in Figures 5 and 6. The two pieces 15a, 15b comprise each: on one side, a housing 19 having third coupling means 20 for a second projection 28, the third coupling means 20 being identical to the first coupling means 8; at least on the same side at least a seat 26 for the insertion of a cushioning element 27; on the opposite side, the respective second projection 28 for removable connection to the third coupling means 20. In this way, the two pieces 15a, 15b can be mutually fastened, through the engagement of the second projection 28 in the third coupling means 20.

In this way, the active interposition is obtained of said cushioning element 27 between the two pieces 15a and 15b, enhancing the sound damping of the structure.

Conveniently, moreover, the complex of elements of the present invention comprises at least three bearing elements 29 identifying in combination a bearing plane.

As shown in Figure 5 and in Figure 6, each of said bearing elements 29 comprises at least: on one side a third bearing projection 30 so shaped as to have a single bearing point; on the other side at least a seat 34 for the insertion of a cushioning element 35 and, also on this other side, a housing 36 having fourth coupling means 37 identical to the first coupling means 8.

The bearing projection 30 is preferably a portion of sphere or of ellipsoid.

Advantageously, as shown in Figure 5 and in Figure 6, each of the bearing elements 29 is associated to the two pieces 15a, 15b of the support element 15 with the active interposition of the related cushioning elements 27,35.

Preferably each of the bearing elements 29 and each of the two pieces 15a, 15b of the support element 15 is made of a different metal alloy to reduce acoustic resonance. In particular, the metal alloy can be chosen in a group including bronze, brass, aluminium alloy, lead steel.

As shown in Figure 1, the assembly constituted by the bearing element 29 and by the two pieces 15a and 15b can be used as a foot of the structure, through the engagement in the third coupling means 20 of the pin 31 connected to an upright 1. The point-like contact of the bearing projection 30 with the floor or with the ground, together with the presence of the cushioning elements 27,35 and with the difference in metallic material, contributes to isolate the structure from any vibrations which may be transmitted by the floor or by the ground.

As shown in Figure 1 the bearing element 29, coupled with the junction element 33 and engaged on a pin 31 through the fourth coupling means 37, can be used as an element for closing and locking the structure in correspondence with the mutual engagement of two cross members 2 and of the related upright 1 in a node. Without coupling with the junction means 32, the bearing element 32 can be used as a finishing element or knob in

correspondence with the first extremity 11 or of the second extremity 12 of the upright 1.

Preferably, if the complex of elements of the present invention is used to compose furnishing items to support sound generation or diffusion systems, and, thus, when a sound- proofing structure that is insensitive to vibrations is to be obtained, the cross members 2 are constructed starting from solid bars or rods.

In an alternative embodiment of the invention shown in dashed lines in Figures 7b and 7c, each cross member 2 comprises at least a central part 22, a first extremity 23 and a second extremity 24 connected to each other in removable fashion. This removable connection can also be obtained by means of fixed couplings or threads.

In particular, as shown in the right side of Figure 7b, the first and the second extremity 23,24 can be simple plugs to be inserted on a removable tubular element constituting at least a portion of the central part 22. In the walls of said tubular element are obtained the through holes 25 and the second coupling means 9. To renforce the structure, in correspondence with the indentations 4,5,6,7, as shown in the left part of Figure 7c, appropriate inserts 38,39, wherein appropriate through holes are obtained for the passage of the pins 31, can be inserted into the tubular element.

Alternatively, as shown in the left side of Figure 7b, the first and the second extremities 23, 24 can comprise, respectively, the entire area involved by the first and by the second indentation 4,5, as well as by the second coupling means 9. Appropriately, in this case, in the presence of the third intermediate indentation 6, the central part 22 is subdivided into two tubular elements and into a solid central element, the solid central element comprising the third indentation 6 and second coupling means 9, if present.

The segmentation of the cross members 2 allows a greater versatility of assembly and a greater lightness of the structure, without thereby excessively impairing its mechanical soundness.

The invention achieves important advantages.

First of all, the capability of constructing solid and complex structure with extreme

ease, using a very limited number of extremely simple elements. This allows to construct furnishing items of all kinds, such as chairs, tables, sofas, cabinets, shelves, furniture for stereophonic systems and the like.

Advantageously, the particular association of the elements to each other, and their conformation allows to obtain structures with high sound insulation, thereby allowing to construct furnishing items for sound generation and reproduction having extremely high fidelity, in particular systems equipped with vacuum tube amplifiers.

The invention thus conceived can be subject to numerous modifications and variations, without thereby departing from the scope of the inventive concept. Moreover, all components can be replaced by technically equivalent elements.

In practice all materials employed, as well as the dimensions, can be any, depending on requirements.