Clamping fixture for detachably fastening a disk-shaped tool

A clamping fixture for detachably fastening a disk-shaped tool on a rotatably driven working spindle with a driven gear, the clamping fixture comprising a fastening element;

• a supporting flange arranged so that the tool is accommodated between said fastening element and said supporting flange, said supporting flange being rotatably displaceable relative to the working spindle in the tightening direction and axially in a direction toward the tool, said supporting flange being displaceable relative to said working spindle in a release direction and axially away from the tool when said fastening element is released, said supporting flange being lockable with an element selected from the group consisting of said working spindle and a component which is non-rotatably connected with said working spindle in a position which is displaced axially in a direction of the tool, and said supporting flange cannot be displaced axially away from the tool until a lock is released.