Fixing device

A fixing device, comprising:

• first and second threaded rings having rectilinear slots introduced therein with all of the slots opening to an outside of the first and second threaded rings and having partially annularly extending webs between the slots;
• a membrane held between the first and second threaded rings, the membrane being an integral part of the first and second threaded rings and being kept at a distance from the first and second threaded rings by the slots in an unmounted state of the first and second threaded rings;
• and
• a first clamping bolt usable to adjust the axial distance between the first and second threaded rings, the clamping bolt passing through the membrane between an adjacent pair of the webs, in the unmounted state of the first and second threaded rings the membrane being undeformed and parallel to the first and second threaded rings, in a mounted state of the first and second threaded rings the membrane being moved between the webs and deformed in a direction of at least one of the first and second threaded rings to at least partially form a slanted or arc course as soon as a distance between the first and second threaded rings is reduced by the first clamping bolt, the first clamping bolt passing through the membrane and passing through an adjacent pair of the slots that are separated from and on opposite sides of the membrane.