Height-adjustable device

A height-adjustable device, the height-adjustable device comprising:

• at least two synchronously height-adjustable lifting devices, which each comprise a standing element and a lifting element, the lifting element being height-adjustable relative to the standing element;
• pulling elements configured to carry out a height adjustment of the height-adjustable lifting devices, wherein:
• each of the pulling elements is secured in a non-positive-locking manner or a positive-locking manner to two of the lifting devices, and is configured such that a lengthening in a region of a first lifting device, of the two lifting devices, brings about a synchronous shortening in a region of a second lifting device, of the two lifting devices, and
• each of the pulling elements is constructed to raise only the corresponding lifting element relative to the associated standing element;
• redirection devices configured to raise the corresponding lifting element relative to the associated standing element for each of the lifting devices, and configured to guide the pulling elements;
• and
• a locking device configured to lock each of the pulling elements by a non-positive-locking engagement or a positive-locking engagement with the corresponding one of the pulling elements,
• wherein the locking device is configured to synchronise the movement of the pulling elements,
• wherein the locking device has a shaft for the non-positive-locking engagement or the positive-locking engagement, and for locking and synchronisation by engaging both of the pulling elements, and
• wherein the locking device comprises redirection rollers in a region of a forward offset or of a backward offset of the pulling elements arranged adjacent to the shaft, the redirection rollers being configured to secure the non-positive-locking engagement or the positive-locking engagement of the pulling elements to the shaft.