Patent ID: 7938408

Claim:
Tool holder, the receiving section of which comprises clamping means which are provided centrally with respect to an axis of rotation of the tool holder for holding a shank of a rotary tool, and which define a receiving opening for the shank, it being possible for the clamping means to be displaced in the radial direction between a radially widened release position for insertion or removal of the shank and a clamping position, in which the clamping means exert radial press-fit forces, which hold the shank in a frictional lock on its cylindrical outer circumferential surface, on the shank, and the clamping means being assigned a clamping surface with a cylindrical contour which, in the clamping position, bears against the outer circumferential surface of the shank with surface-to-surface contact, wherein the region of the tool holder which forms the clamping surface has a multiplicity of groove sections which are curved about the axis of rotation, are arranged at an axial distance from one another and, with respect to the direction of the axis of rotation, delimit between themselves supporting regions, which are integrally connected to one another, are arranged at an axial distance from one another, project towards the axis of rotation and the roof surfaces of which, located towards the axis of rotation, form the cylindrical clamping surface, wherein the width of each groove section is narrower than the width of the roof surface between adjacent groove sections.