Supporting frame for a cabinet of an electrical panel

1. A supporting frame for a cabinet of an electrical panel, comprising:

a plurality of corresponding corner joints, wherein the corner joints have:

a central body and three profiled arms protruding therefrom, each arm having a substantially flat wall from which two oblique walls protrude; and

protrusions extending from surfaces of the substantially flat walls of the arms;

a plurality of uprights; and

a plurality of cross members, wherein the uprights and cross members have:

a substantially flat wall from which two oblique walls protrude; and

a hollow profile body forming a seat suitable to accommodate an arm of a corresponding corner joint, wherein holes in the substantially flat walls of the uprights and cross members are suitable to engage the protrusions of the substantially flat walls of the arms of the corner joints when the arms are accommodated in a corresponding seat.

2. The supporting frame according to claim 1 , wherein the protrusions comprise:

a body having a substantially circular cross section and having a first base surface which is fixed to the substantially flat wall of an arm;

a second surface, which lies opposite to the base surface substantially on a plane which is inclined with respect to the substantially flat wall of the arm; and

a third surface for connection between the first and second surface, which forms an abutment for at least one portion of a rim of the holes in the substantially flat walls of the uprights and cross members.

3. The supporting frame according to claim 1 , wherein the surfaces of the substantially flat walls of the arms have two protrusions suitable to engage two corresponding holes on the substantially flat walls of the uprights and cross members.

4. The supporting frame according to claim 1 , wherein the surfaces of the substantially flat walls of the arms comprise:

a base surface;

a central U-shaped cutout; and

at least one flexible tab protruding from the base surface in a direction which is substantially parallel to the substantially flat wall, the tab having an end which is shaped so as to enter a corresponding seat in the uprights and cross members.

5. The supporting frame according to claim 4 , wherein the protrusions are positioned on the tabs.

6. A cabinet of an electrical panel comprising a supporting frame according to claim 1 .

7. The cabinet according to claim 6 , wherein the cabinet comprises four uprights and eight cross members interconnected with one another by eight corner joints.

8. The supporting frame according to claim 7 , wherein the three arms extend substantially perpendicularly to one another.

9. The supporting frame according to claim 1 , wherein the three arms extend substantially perpendicularly to one another.