application_number US 41582503 A description the bearing device further comprises an internal element 6 centred on the same axis 7 as the external element 1 the internal element 6 is in the form of a solid cylindrical piece having an external cylindrical span 8 a plurality of holes 10 is provided at one end of the revolving internal element 6 for taking up screws illustrated at 11 for example intended for attaching a rotating steering wheel 12 illustrated diagrammatically in dotted lines the steering wheel 12 is fixed on an axial end of the revolving part supporting a magnet at its other end the internal element 6 exhibits a radial face 6 b from which the holes 10 are formed in the embodiment illustrated a ball bearing 13 is mounted between the external element 1 and the internal element 6 the ball bearing 13 comprises a row of balls 14 disposed between an external ring 15 mounted in the bore of the tubular portion 2 of the external element 1 and an internal ring 16 mounted on the cylindrical span 8 of the internal element 6 in a variant it could well be that the rolling elements such as the balls 14 or rollers needles etc are mounted directly in contact with the external elements 1 and internal elements 6 by means of races machined on said external and internal elements the external ring 15 embedded in the bore of the tubular portion 2 of the external element 1 is provided with a race 15 a for the rolling elements 14 the internal ring 16 embedded on the cylindrical span 8 of the internal element 6 is provided with a race 16 a for the rolling elements 14 the external ring 15 is also provided with two symmetrical.