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The invention relates to a conveying device for a trolley, in particular to a refreshments trolley, in an aircraft passenger cabin and consists in the fact that the conveying device comprises an electric drive with two drive wheels 12, 13 for moving the trolley 7 inside the aircraft passenger cabin,

The invention relates to a conveying device for a trolley, in particular to a refreshments trolley, in an aircraft passenger cabin and consists in the fact that the conveying device comprises an electric drive with two drive wheels 12, 13 for moving the trolley 7 inside the aircraft passenger cabin, a further electric drive for raising and lowering the trolley 7 and a current collector 20 for supplying current to the installed electric motors 36, 37. The service crew is as a result relieved of physically tiring work and the trolley 7 is secured against uncontrolled movements during the service phase.

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1. A conveying device for a trolley, in particular for a refreshments trolley, in an aircraft passenger cabin, comprising: an electric drive with two drive wheels for moving the trolley inside the aircraft passenger cabin,a further electric drive for raising and lowering the trolley, the further ele

1. A conveying device for a trolley, in particular for a refreshments trolley, in an aircraft passenger cabin, comprising: an electric drive with two drive wheels for moving the trolley inside the aircraft passenger cabin,a further electric drive for raising and lowering the trolley, the further electric drive device arranged inside two columns on which a respective elevating tube is vertically movable, anda current collector for supplying current,wherein the electric drive for moving the trolley comprises two drive units, each arranged at a bottom end of a different one of the two column, and each including an electric motor, a gear unit, one of the two drive wheels and a support wheel, wherein the two drive wheels interact with a tooth rail on the cabin side. 2. The conveying device according to claim 1, wherein the elevating tubes are connected together by two cross struts to produce a frame. 3. The conveying device according to claim 2, wherein the further electric drive comprises an electric motor with an elevating spindle and an elevating nut arranged inside the columns, wherein the elevating nut comprises two protrusions which are guided in longitudinal slots, and the elevating tubes are firmly connected to the protrusions. 4. Conveying device according to claim 2, wherein two top projecting arms are arranged on a top one of the two cross struts and two bottom projecting arms are arranged on a bottom one of the two cross struts. 5. The conveying device according to claim 4, wherein the top projecting arms are pivotable with a pivoting tube about a shaft. 6. The conveying device according to claim 5, wherein the shaft comprises a four cornered part which interacts with a square aperture inside a bearing block such that the pivoting tube with the projecting arms is locked or unlocked by displacing the shaft. 7. The conveying device according to claim 6, wherein the shaft comprises two circumferential detent notches which interact with a detent pin arranged inside a bearing block. 8. The conveying device according to claim 4, wherein the bottom projecting arms have an elbowed shape. 9. The conveying device according to claim 8, wherein a pivoting angle of the bottom projecting arms is limited to 90° by a stop. 10. The conveying device according to claim 1, wherein the current collector comprises a head part of an electrically insulating material in which two metallic contact holders with inserted sliding contacts are arranged. 11. The conveying device according to claim 10, the head part with the contact holders and the inserted sliding contacts is brought by means of a tension spring into contact with electrical conductor tracks which are arranged inside a current rail. 12. The conveying device according to claim 4, wherein the projecting arms have an angular cross section and are provided with an end plate. 13. The conveying device according to claim 4, the projecting arms comprise in the top area of their cross section an upended longitudinal strip with notches. 14. The conveying device according to claim 4, wherein the bottom projecting arms are connected together by a pivoting tube. 15. The conveying device according to claim 1, wherein the conveying device is usable to transport jackets. 16. A conveying device for a trolley, in particular for a refreshment trolley, in an aircraft passenger cabin, the conveying device comprising:a frame having one end coupled to a plurality of drive wheels, a pair of elevating tubes movably mounted to the frame and engageable with the trolley,a first electric drive carried by the frame and configured to drive the plurality of drive wheels to move a combination of the frame and the trolley along the aircraft passenger cabin with the trolley supported by the pair of elevating tubes and suspended above a floor of the cabin, anda second electric drive carried by the frame and configured to raise and lower the pair of elevating tubes to raise and lower the trolley. 17. The conveying device according to claim 16 further comprising: a guide rail extending along the aircraft passenger cabin, anda guide unit engageable with the guide rail and coupled to an opposite end of the frame, wherein the combination of the frame and the trolley moves in the aircraft passenger cabin along the guide rail. 18. The conveying device according to claim 16 wherein the frame comprises first and second columns, and wherein one of the pair of elevating tubes is movably disposed about the first column and the other of the pair of elevating tubes is movable disposed about the second column,and wherein the second electric drive is configured to drive the pair of elevating tubes longitudinally along the first and second columns to raise and lower the trolley. 19. The conveying device according to claim 16 wherein the second electric drive comprises one electric drive is arranged inside the first column and another electric drive arranged inside the second column.