shown in fig4 by way of example as can be clearly seen in fig1 the base 13 can be secured to the furniture unit 12 by means of screws 14 and is fitted with a wing 15 shaped in the form of an upturned u and secured to the base by means of screws 29 30 to obtain a known position and height adjustment the wing in turn supports the kinematic articulated chain ending inside the cup 24 which is recessed into a complementary compartment made in the door 11 for example the kinematic chain comprises a first element 16 having one end superiorly pivoted to the wing by means of a pivot 17 while a second element 18 has one end frontally pivoted to the wing by meads of a pivot 19 a third element 20 is posteriorly pivoted by means of a pivot 21 to the other end of the first element 16 and is centrally pivoted with a pivot 22 in an intermediate position of the element 18 so as to form a first articulated quadrilateral the element 20 extends beyond the pivot 22 and then curves towards the end to become pivoted by means of a pivot 23 inside the cup 24 the end of the element 18 opposite the wing 15 is pivoted by means of a pivot 25 to the end of a fourth element 26 which has its other end connected by means of a pivot 27 to the inside of the cup 24 so as to form a second articulated quadrilateral the kinematic mechanism obtained enables the hinge to rotate to and from the open and closed position it may also be provided with a spring device not shown to facilitate the movement towards the two extreme positions.