the invention relates to a device for operating an optionally rotatable and parkable divider element which may be displaced in a linear and / or curved manner , fixed to at least two running gears , provided with support rollers which run in a running track , of which at least the first running gear is provided with a drive shaft arranged in a direction perpendicular to the running direction thereof , by means of which a drive wheel may be rotated which engages in a toothed element arranged along an inner wall of the running track . according to the invention , the first running gear is provided with an electric motor , arranged between the support rollers , the motor shaft of which is fixed to the drive shaft .