Inner clamping means comprising a secured clamping segment ring

A clamping means in the form of an inner clamping means for fixing workpieces, having the following features:

• the clamping means has a housing extending in an axial direction;
• the housing has a clamping cone tapering toward a distal end thereof and the clamping cone is aligned in the axial direction;
• the clamping means has a clamping segment ring comprising a plurality of clamping segments, the clamping segments being movable relative to one another in a radial direction;
• the clamping segments have, on an outside thereof, a clamping surface for contact with the workpiece;
• the clamping segments have, on an inside thereof, an obliquely angled sliding surface for contact with the clamping cone, thus enabling the clamping segments to be moved radially relative to one another by joint axial movement relative to the clamping cone;
• the clamping means has at least one ejector pin received in an opening of the housing and being movable in the axial direction relative to the housing so as to apply a force to the clamping segment ring for separation from the clamping cone;
• a contact region for reception of or contact with a distal end of the ejector pin is provided on a proximal end face of at least one of the clamping segments;
• the contact region and the distal end of the ejector pin are designed such that, when the distal end of the ejector pin is arranged in the contact region, the ejector pin restricts outward mobility of the at least one clamping segment in the radial direction in a positive-locking manner.