interleaved with one another in particular the first shift weight carrier 34 1 is arranged in the interior of the second shift weight carrier 34 2 this is different for the associated parallel links 23 the parallel links 23 1 r and 23 1 l supporting the first shift weight carrier 34 1 are arranged offset in height from one another the same applies to the parallel links 23 2 r and 22 2 l supporting the second shift weight carrier 34 2 it is in particular clearly apparent from the drawings that the parallel links 23 arranged in each case on one side of the shift weight carriers 34 are arranged directly over one another in other words the parallel links 23 of the two shift weight carriers 34 are diagonally interleaved with one another a shift weight 22 is mounted suspended under each carrier arm 30 the shift weights 22 have an essentially roller shaped body with two recesses 36 located close to the ends thereof the recesses 36 match corresponding indentations in the shift weight receiver 20 so that the shift weights 22 can be placed into the shift weight receiver 20 substantially without axial play in the embodiment illustrated the shift weights 22 are suspended at the same height under the carrier arms 30 in order to achieve a time offset loading of the shift weight receiver 20 on lowering of in particular the second outer shift weight carrier 34 2 the indentations of the shift weight receiver 20 associated with the corresponding shift weights 22 2 r and 22 2.