it shows a configuration of the components of a spindle and guidance system in the inside of a not illustrated profiled rail 10 and cover 11 a motor 3 is connected to a spindle 4 which enables the transmission of a turning moment a spindle nut 5 is disposed on the spindle 4 that can be moved in a translatory manner on the spindle 4 the spindle nut 5 is connected to slide shoes 6 the shoes 6 are guided on two rails 7 orientated parallel to the spindle 4 such a guidance system significantly increases the torsional rigidity of the drive system furthermore the spindle nut 5 is connected to a fastening element 8 that has positioning aids 9 for accurate orientation of structures that are to be attached due to the fact that during operation of the drive units relative movements take place between the spindle nut 5 and spindle 4 and between the rails 7 and the slide shoes 6 the drive unit 2 must be configured in a manner such that it is sealed against soiling and water the advantageous embodiments of such a configuration are shown in fig3 4 0068 fig3 shows a perspective representation of an embodiment.