in the pinion 28 of fig2 this causes a tension to be exerted on the pinion 28 by the drive spring 23 when the friction clutch 1 disengages as a result of the releasing of pre stressing on the compensation spring 11 as the friction clutch 1 disengages the latter is now turned by the pinion 28 through the worm gear fig6 shows a schematically depicted view of the profile region 15 of the compensation spring 11 of fig1 the profile region 15 is formed from radially oriented profile surfaces 17 distributed around the circumference for example shaped or opened out from the compensation spring 11 fig7 shows a schematically depicted view of the profile region 16 of the pressing plate 3 of fig1 the profile region 16 is formed from profile surfaces 18 distributed around the circumference for example from overlay parts 31 solidly accommodated on the pressing plate 3 the form of the profile surfaces 18 is spiral shaped it goes without saying that the profile regions 16 17 depicted in fig6 and 7 may also be arranged inversely on the pressing plate 3 or on the compensation spring fig8 shows a schematic representation of the two profile regions 15 16 of fig6 7 overlaid on each other with the profile surfaces 17 17 u2032 18 in the non adjusted state between the profile surfaces 17 u2032 and the profile surfaces 18 the overlay areas 13 u2032 with the radius r.