toothed spindle 14 reaches a shaft 16 is also a component of fixture 10 on which shaft there sits a bearing which carries a wheel running wheel 18 in a rotary manner wheel 18 has a running face 18 f on which a brake shoe acts according to the prior art de 197 24 577 c1 the braking device according to the invention on the other hand includes a bearing block 20 which is fixed to fixture 10 and extends over the lateral faces of wheel 18 at a distance from running face 18 f of wheel 18 and parallel to shaft 16 as fig1 show the two sections 201 20 r of bearing block 20 running outside the wheel carry bolts 22 which run essentially horizontal and parallel to a wheel web 18 s of wheel 18 carrying running face 18 f on its peripheral side brake levers 241 24 r are carried in a rotary manner on bolts 22 it can be seen from fig3 in particular that the brake levers each have a shorter arm 241 o 24 ro above bolts rotary pivots 22 than in the lower part arms 241 u 24 ru sections 241 u 24 ru are bent inwards towards one another at their lower end and carry friction linings 26 there in the assembly position but in the state of wheel 18 when the brakes are not.