Hinge for an opening door or window frame

A hinge for a door or window having a general plane and comprising a movable frame and a fixed frame, said hinge including one first and at least one second knuckle parts, each provided with a respective leaf for fixing it to said movable frame and to said fixed frame respectively, of the door or window, a pin which connects the said first and second knuckle parts together such that they can rotate, and first and second means of adjustment between the said first and second knuckle parts parallel to and at right angles to, respectively, said general plane of the door or window, wherein the said first and second means of adjustment are independent of each other and the former are functionally connected to the said first knuckle part and the latter to the said second knuckle part of the hinge, the improvement wherein:

• said first means of adjustment include a cam 20 integral with said pin and engaged rotatably inside the cavity of the said first knuckle part, the said cam and the said cavity having surfaces of mutual contact formed in such a way that rotation of the cam causes a movement of relative translation only between the said first and second knuckle parts, and therefore of the said movable frame relative to the said fixed frame, in the said direction parallel to said general plane of the door or window,
• retention means are provided to make the said cam fixed in rotation with the said first knuckle part,
• there exist between the said cam and the cavity of the said first knuckle part, regardless of their relative angular position, at least two axial areas of mutual direct pressure contact located diametrically opposite each other relative to the said pin,
• wherein the said cam comprises:
• first and second angular portions of constant radius on opposite sides of the axis of the pin, with which they are concentric, the first angular portion having a shorter radius and the second angular portion having a longer radius, and third and fourth angular portions of variable radius that connect the said first and second angular portions on opposite sides thereof,
• and wherein the said cavity comprises:
• substantially flat first and second angular sections situated on opposite sides of the axis of said pin and separated from each other by a distance approximately equal to the distance between the said first and second angular portions of said cam, said first flat section being joined up with two angular sections whose constant radius is approximately equal to that of the said first angular portion of the said cam, and the said second flat section being joined up with two angular sections whose variable radius is slightly greater than the variable radius of the said second and third angular portions of the said cam.