Solution:
I decided finally for this Silverline 250115 hand clamps. It was the right decision. The jaws (called so) are from rel. soft plastic, so that the furniture is not damaged. The one-hand clamping mechanism Fct. properly and you can rel. applying well-dosed pressure.
Only the product description I do not consider suitable:
"Extra-large professional version of our hand clamps"
and
"Large, heavy quick release"
This is not likely, there are clamps for minor repairs, such as a little doll furniture. Also heels of my wife I already fixed with these clamps.
Conclusion:
Against this background, good and cheap quick release.