Aircraft rotational joint with a slip-ring device for electrical energy transmission

[0038]FIG. 1 schematically shows the inside of a slip-ring device 1 of an aircraft rotational joint. The rotational joint is used for movably or rotatably connecting a foldable wing tip device to a main wing of an aircraft. The slip-ring device 1 is arranged for electrical energy transmission through an aircraft rotational joint. It comprises a first member 2 attached on a first part of the rotational joint. The first member has a plurality of arcuate conductive ring segments 3. In the embodiments shown in the Figures the ring segments are metal ring segments 3. Only two of the ring segments 3 have been indicated with reference numbers to keep the drawings intelligible. The ring segments 3 are electrically isolated from each other, e.g., by arranging them spaced apart from one another. Further, the slip-ring device comprises a second member (not shown in FIG. 1) which is rotatable relative to the first member about a common rotational axis A which is also the axis of rotation of the ai