Patent ID: 7438634

Claim:
A clamping fixture for detachably fastening a disk-shaped tool on a rotatably driven working spindle with a driven gear which is non-rotatably connected with said working spindle, 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 rotatably 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 the driven gear in a position which is displaced axially in a direction of the tool, wherein said supporting flange cannot be displaced axially away from the tool until a lock is released, further comprising a locking mechanism, wherein said locking mechanism is configured to automatically lock said supporting flange when a specified axial position is reached, and wherein said locking mechanism includes at least one locating bolt which is spring-loaded in a direction of the driven gear and which, in a locking position, engages in an opening of the driven gear.