Spline shaft 1 rotates about fixed axis A-A. Shaft 3 with disk a rotates about fixed axis B-B. By means of device 5 (shown schematically) friction wheel 2 can be shifted along the splines of shaft 1 so that it contacts disk a at points above or below axis B-B. Thus wheel 2 transmits rotation at variable speed and in either direction to disk a and shaft 3. Disk a is pressed against wheel 2 by screw 4.
$3420$CF,ML$