Structurally improved invisible concealed hinge for doors

Invisible concealed hinge (1) for doors of the type comprising:

• a first connecting body (2a) intended to be inserted within a respective housing cavity formed in the jamb or in the leaf of the door, the first connecting body (2a) extending:
• in depth along a first direction (X1) in the space which coincides with the direction of insertion in the respective housing cavity in the jamb or in the leaf;
• in width along a second direction (Y1) in the space perpendicular to the first direction (X1);
• in length along a third direction (Z1) in the space perpendicular to both the first (X1) and the second (Y1) directions;
• a second connecting body (2b) intended to be inserted inside a respective housing cavity formed in the jamb or in the leaf of the door, the second connecting body (2b) extending:
• in depth along a fourth direction (X2) in the space which coincides with the direction of insertion in the respective housing cavity in the jamb or in the leaf;
• in width along a fifth direction (Y2) in the space perpendicular to the fourth direction (X2);
• in length along a sixth direction (Z2) in the space perpendicular to both the fourth (X2) and the fifth (Y2) directions;
• an articulation device (3) that interconnects the first (2a) and the second (2b) connecting bodies allowing their relative movement between a closed condition, corresponding to the closing of the door, and a condition of complete opening, corresponding to the complete opening of the door;
• in the closed condition the first (2a) and the second (2b) connecting bodies defining, in combination between each other, a seat in which is enclosed the articulation device (3), the first (2a) and/or the second (2b) connecting body comprising a supporting structure (4a, 4b), which in turn comprises:
• a central part (40a, 40b) intended to accommodate part of the articulation device (3);
• two end portions (41a, 41b), placed on opposite sides of the central part (40a, 40b) along the length direction (Z1, Z2) of the respective connecting body (2a, 2b) and intended to interact with and/or accommodate fixing means of the connecting body (2a, 2b) to the jamb or the leaf;
• the first (2a) and the second (2b) connecting bodies having two sides (21a, 22a;
• 21b, 22b) opposite with respect to a plane defined by the depth direction (X1, X2) and by the length direction (Z1, Z2), of said two sides (21a, 22a;
• 21b, 22b) the inner one (21a, 21b) being the side that in the opening-closing movement of the hinge (1) runs the shorter trajectory path, the outer one being the other (22a, 22b);
• characterized in that:
• the supporting structure (4a, 4b) is shaped from a single metallic sheet in a single concave piece having concavity facing in a direction opposite to the depth direction (X1, X2) of the connecting body (2a, 2b) and defined by a bottom (42a, 42b) of the supporting structure (4a, 4b) and by side walls (43a, 43b) of the supporting structure (4a, 4b) which carry out a continuous perimeter edge of the bottom (42a, 42b), joined to the bottom (42a, 42b) without interruption in the material which said single metallic sheet is made of and completely surrounding the bottom (42a, 42b) in accordance with a closed curve around the depth direction (X1, X2) of the connecting body (2a, 2b).