Device for fastening a tool to a drive shaft of a hand-held power tool driveable in an oscillating manner

A device, comprising:

• a centering element;
• a spring element;
• a fastening screw;
• a bearing flange with a circular bearing face;
• and
• at least one form-locking element for fastening an axially mountable tool to a drive shaft of a hand-held power tool comprising a chamfer;
• wherein said tool is drivable in an oscillating fashion,
• wherein said centering element is provided for centering said tool relative to said drive shaft,
• wherein said form-locking element is provided for defining a rotary position of said tool relative to said drive shaft,
• wherein said form-locking element is located radially outside said centering element,
• wherein more than eight form-locking elements, each of which form-locking elements including a chamfer, are arranged,
• wherein a radius associated with one position of said form-locking elements is four times as large as a radius of said centering element,
• wherein said form-locking elements are located on said bearing flange,
• wherein said form-locking elements are distributed uniformly over an angular range that is defined by the entire circumference of said circular bearing face of said bearing flange,
• wherein said form-locking elements have a trapezoidal cross section, which is perpendicular to an axis of the drive shaft (16),
• wherein said fastening screw is provided with said spring element acting as a contact-pressure flange, and
• wherein in a mounted state the spring element automatically deflects said tool past each chamfer of each of said more than eight form-locking elements into a rotary position in which said tool can be fixed by tightening said fastening screw.