door frame 14 and moving the door 12 away from the door frame 14 on z axis the shorter second plate 54 of the first l shaped connecting element 50 is at 155 degree angle with the door 12 pulling the apex 56 of the first l shaped connecting 50 elements toward the door 12 and moving the door 12 inward on x axis the longer first plate 52 of the l shaped connecting elements 50 and 51 slid further inward forcing the door 12 to rotate further outward the concealed hinge mechanism 10 allows the door 12 to be placed inside of the door frame 14 and opened up to 225 degree angle relative to door frame 14 starting at 90 degree angle closed position several angles of the rotational and outward movement depicted in figures fig8 fig9 fig1 and fig1 as examples referring to fig8 the door 12 and the door frame 14 depicted in 90 degree angle da closed position connected by the concealed hinge mechanism 10 the short plates 54 of the connecting elements 50 and 51 are at 45 degree angle relative to the door 12 and the door frame 14 referring to fig9 the door 12 is shown in open position at the angle da of 135 degree relative to the door frame now the shorter second plate 54 of the second l shaped connecting element 51 is at 90 degree angle relative to the door frame 14 moving the apex 56 of the second l shaped connecting element 51 away from the door frame 14 and moving the door 12 away from the door frame 14 on the z axis the shorter second plate 54 of the first l shaped.