Torque-transmitting system

In a torque-transmitting system, a combination comprising a housing having a tool holder section rotatable in a predetermined direction;

• a driven output shaft journalled in said housing and having a free end portion at said tool holder section;
• a tool having a shank provided with a front portion and with a rear portion which is of profiled cross-section and has a rear end face, the profiling of said rear portion extending lengthwise of said shank and also being inclined relative to the longitudinal axis of said tool towards said front portion at an angle of twist of between substantially 70.degree.-85.degree. and circumferentially of said rear portion in said predetermined direction;
• and a receiver for said rear portion formed in said tool holder section and having portions configurated for matingly receiving the profiled rear portion and coacting with the latter for drawing said tool axially inwardly into said tool holder section in response to rotation of the latter due to the coaction between the inclined profiling and said portions of said tool holder section, whereby said rear end face is held in motion-transmitting relationship with said free end portion of said shaft.