in the normal operating state in fig2 27 the requisite individual parts for the version of the gear mechanism shown in fig2 and 24 are shown in fig2 views are shown of the guide tube 6 and the disk 27 embodied as a flange 31 in fig2 views of the perforated disk 28 are shown the perforated disk 28 on the side 33 toward the drive member 2 has two protrusions 35 and a central round opening 37 these means serve to fix the perforated disk 28 to the housing 2 1 the side of the perforated disk toward the drive member is indicated by the numeral 36 in fig2 views of the spacer tab 29 are shown the spacer tab 29 is in the form of a flat lever which is provided on one end with a claw 41 that has an open end 40 and on the other end with an eye 42 in fig2 an exploded view of the gear mechanism of fig2 24 is shown besides the first disengageable clutch 27 28 a second disengageable clutch can be seen which comprises a coupling sleeve 43 connected to the drive shaft 1 and a coupling rod 44 that engages this coupling sleeve enlarged views of this second disengageable clutch are shown in fig2 and 30 the coupling sleeve 43 has inner portions namely an inner slaving portion 43 1 and a inner freewheeling portion 43 2 the inner slaving portion 43 1 has a reduced radius compared to the inner freewheeling portion 43.