Abstract: The door is connected to the fixed frame of a cabinet by means of two elbow-shaped horizontal arms each of which is constituted by two branches, by an elbow and by two extremities rotatable round respective pivots. The ratio between the length of the second branch and that of the first branch is greater than 1 and the ratio between the length of said first branch and the distance (A) between said pivot and the closest point of the door in the closed position is equal to or greater than 1.In the displacement of the door, the two elbow-shaped horizontal arms co-operate with a guide whereby the door is maintained substantially parallel to the fixed frame.