A device for loading and unloading the utility surface (3′) of a drying chamber (2) of a freeze drying system. The device includes a carriage (8) which forms a movable guiding edge for the drying vessels (5), and is moveable on guides (7) disposed on both sides of the utility surface (3) and which extend in parallel with the movement direction and form fixed guiding edges for the drying vessels (5). At least one linear motor is provided to produce a drive for the carriage. All of the components of the device can be located inside the drying chamber (1), and the device of the present invention is suitable for upgrading existing freeze drying systems.