the lateral walls of the second box shaped element 6 by sliding said sliding creates friction between the friction element 22 which hinders door 3 opening also contributing to making the movement fluid and damped and reducing the possibility of sudden sharp movements by the door the sliding of the projections 24 a 24 b continues until the hinge 4 fully open configuration is reached as illustrated in fig7 and logically also in the opposite path which returns the hinge 4 to its closed configuration illustrated in fig2 and 3 in other words the friction or rubbing created between the friction element 22 and the walls 6 a 6 b of the second element 6 during their relative movement causes a dissipation of energy by friction it was realized that said dissipation obtained by increasing hinge internal frictions advantageously allows extension of the door weight range that a predetermined hinge can balance experimentally it was found that a hinge of the type described when it has no friction element 22 can balance doors of different weights within a range of approximately 350 g whilst if the friction element 22 is used the same hinge can effectively balance doors of different weight within a range of approximately 1000 g in other words if the hinge.