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  • doc. Ing. Leopold Hrabovský, Ph.D.
  • Ing. Robert Brázda, Ph.D.
  • Ing. Jiří Bobok
  • Ing. Tomáš Mlčák, Ph.D.

VSB – Technical University of Ostrava
Faculty of Mechanical Engineering
Institute of Transport


In the operation of electric elevators driven by a friction disc, the ropes suffer from different tensile stress in the rope crosssections due to the differences in rope stretch. Some loadbearing rope cross-sections may thus be overloaded when operating both electric freight and personal elevators. However, such uneven distribution of tensile stress may be eliminated, thus rendering to a longer life of load-bearing ropes and friction discs.

Researchers from VSB-TUO have developed a method and device that enable a set-up, monitoring, and verification of the tensile stress size in the partial rope cross-sections supporting the car using the so-called rope traction compensation. The device is also able to set the tensile forces in the partial crosssections of load-bearing ropes when constructing new elevators or upgrading the existing ones. The traction in elevator ropes may be compensated using a mobile device, to which the load-bearing rope cross-sections are attached. The rope length is not disrupted due to the insertion of 'traction compensation' between the two rope ends. The prestress in the ropes is measured using meters allowing for a balanced distribution of load into the partial cross-sections of the load-bearing ropes in elevators.

Form of Intellectual Property Protection

  • patent protected


  • faster than the existing solutions
  • time savings
  • concurrent measurements of all ropes
  • measurements during elevator car operation

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