Lifting apparatus for raising and lowering heavy objects

A lifting apparatus for raising and lowering in particular heavy objects, comprising:

• two frame assemblies that are positioned one above the other with respect to a vertical direction (z), the lower frame assembly of which is suspended on the upper frame assembly using lifting traction means, whereby winding of the lifting traction means allows the lower frame assembly to be drawn up towards the upper frame assembly by means of a raising/lowering device, and subsequent unwinding of the lifting traction means allows said lower frame assembly to be lowered relative to the upper frame assembly;
• and
• oblique traction means that extend between the two frame assemblies and can be wound and unwound using a tensioning device, two of the oblique traction means mutually intersecting such that the lower frame assembly is stabilized, relative to the upper frame assembly, in at least one deflection direction that extends transversely to the vertical direction (z), the tensioning device being able to retain each of the oblique traction means under tensile stress during winding and unwinding of the lifting traction means,
• wherein the tensioning device comprises four tensioning drives which are each coupled to one tensioning shaft, at least two of the oblique traction means in each case being able to be wound around one of the four tensioning shafts at least in part.