Hidden hinge system for doors or windows

Hidden hinge system (1) for doors or windows comprising a fixed frame (100) defining an opening and a movable leaf (200) closing said opening, each one of which is made up of profiles (101, 201) having at least a perimeter channel (102, 202), wherein said hinge system comprises:

• a first body (2) that can be fixedly connected in a perimeter channel (102) of a profile (101) of said fixed frame (100);
• a second body (3) that can be fixedly connected in a perimeter channel (202) of a profile (201) of said movable leaf (200);
• and
• a lever assembly (4) articulating each other said first body (2) and said second body (3);
• wherein said lever assembly (4) comprises:
• a first lever (5) with a first end (5a) rotatably articulated to said first body (2) about a first rotation axis (A1) fixed with respect to said first body (2), a second end (5b) rotatably articulated to said second body (3) about a second rotation axis (A2) parallel with respect to said first rotation axis (A1) and fixed with respect to said second body (3), and a middle portion (5c) interposed between said first end (5a) and said second end (5b),
• a second lever (6) having a first end (6a) articulated to said first body (2), a second end (6b) rotatably articulated to an end of said second body (3) about a third rotation axis (A3) parallel with respect to said first rotation axis (A1) and a middle portion (6c) interposed between said first end (6a) and said second end (6b),
• wherein said first lever (5) and said second lever (6) are rotatably articulated each other in correspondence of their middle portion (5c, 6c) about a fourth rotation axis (A4) parallel with respect to said first rotation axis (A1),
• characterised in that
• said first end (6a) of said second lever (6) is articulated to said first body (2) by a kinematic pair (7, 8) realizing a rotation and translation relative motion of said first end (6a) of said second lever (6) with respect to said first body (2) respectively about a fifth rotation axis (A5) parallel with respect to said first rotation axis (A1) and along a trajectory (T) that extends towards said first rotation axis (A1) and that, for at least a portion, is tangent or coincident with respect to at least one rectilinear direction (R) contained in a plane perpendicular with respect to said first rotation axis (A1), wherein said at least one rectilinear direction (R) is incident with respect to the plane defined by said opening (PA).