Bevel friction wheel 1 rotates about fixed axis A and has central axis 0a which does not coincide with its axis of rotation A. Wheel 1 contacts two identical bevel friction wheels 2 which rotate about axis B of link 3. Link 3 turns about fixed axis 0 which is perpendicular to the plane of the drawing and intersects axes A and 0a. When wheel 1 rotates, link 3 oscillates about axis 0.
$3374$SmF,ML$