assume a plurality of stable positions in which it preferably engages and which are preferably offset about the axis of rotation by identical angles of rotation in the case of the carrier element according to fig1 it will be assumed that the stable positions are offset with respect to one another by 90 distributed over its external circumference the carrier element has a plurality of operator control arrays with operator controls be of which a first operator control array g 1 is shown pointing upwards and a second operator control array g 2 can be seen pointing to the side in fig1 in the illustrated example the operator controls of the various operator control arrays lie in essentially planar surfaces which are slightly inclined with respect to the axis of rotation in such a way that the carrier element is embodied in the manner of a truncated cone and tapers towards the handrest end of the armrest at the front end of the armrest there is a terminating end surface which is oriented as an extension of the axis of rotation and transversely with respect to it and as in a fixed arrangement an additional operator control array gz with further operator controls which may be provided in particular for setting seat perimeters of the driver 39 s seat for example seat depth inclination for backrest etc of the plurality of operator control arrays on the carrier element tk only the upwardly pointing operator control array that is to say the operator control array g 1 in the illustrated position of the carrier element will be provided by way of example for control operator control array g 1 will be referred to as an active operator control array the operator.