Abstract: A pulling device, which serves preferably to pull in and out a cloth or blind of a window blind assembly, has a pulling cable. Opposite ends of the cable are mounted at the bottom ends of guide rails that are arranged on opposite sides of the cloth. From such attached ends, the cable is guided over deflecting rollers in a hollow member and is wound at least once therein around two rollers that are forced apart by a spring element, in particular a gas pressure spring. The hollow member has at opposite ends thereof respective sliding elements that guide the hollow member along the guide rails. The hollow member is attached to the end of the cloth that is to be moved. The entire length of the cloth can be pulled outwardly uniformly by the pulling device.