Tool coupling

In a tool-and-tool holder assembly including

• a tool having a tool shank;
• said tool shank having a longitudinal axis and a terminal stub;
• a clamping member disposed in said terminal stub;
• said clamping member having a clamping member axis perpendicular to said longitudinal axis and said clamping member being movable along said clamping member axis;
• a tool holder including a tool holder body having a receiving bore for receiving said terminal stub and said clamping member;
• and
• two clamping screws threadedly supported in said tool holder body for cooperating with said clamping member;
• the improvement wherein
• said clamping member is in a force-transmitting relationship with said terminal stub in either direction parallel to the longitudinal axis of said tool shank,
• each said clamping screw has a first conical face and said clamping member has recesses each bounded by a first conical face;
• upon tightening at least one of said clamping screws, said first conical faces of the two screws are pressed against said first conical faces of respective said recesses of said clamping member for generating a first axial force component urging said shank into said receiving bore, whereby said shank is axially tightened against said tool holder body;
• at least one of said clamping screws has a second conical face adjacent said first conical face of said clamping screw;
• said clamping member has an overhanging portion projecting over at least one of said recesses and having a second conical face;
• upon unscrewing said clamping screw, said second conical face of said clamping screw and said second face of said clamping member are pressed to one another for generating a second axial force component urging said shank in a direction out of said receiving bore.