on this drive shaft 3 this bevel gear wheel meshes with a further bevel gear wheel 6 which is arranged orthogonally thereto and is connected to an output shaft 5 as an adjusting spindle for a pivoting device the bearing block 7 forms the bearing for the drive shaft 3 on the one hand and the bearing for the output shaft 5 on the other hand this bevel gear could therefore not absorb excessively large tensile or compressive forces which are transmitted by the adjusting spindle or output shaft 5 i e the u shaped bearing block might warp a section having a larger diameter d which for example is integral with the drive shaft 3 or consists of two parts is therefore provided on the drive shaft between the driving bevel gear wheel 4 the driving gear wheel and the bearing block 7 in any case a frictional connection is required between the driving bevel gear wheel 4 and the drive shaft 3 if the drive shaft is produced from two parts it is advantageous if the driving bevel gear wheel 4 is in the form of a clutch for the two parts of the drive shaft in particular this bevel gear wheel could form a part of the section with the larger diameter to which a corresponding narrower sleeve 8 could then be connected furthermore it is entirely advantageous within the scope of the invention if the driving bevel gear wheel 4 and the sleeve 8 consist of.