| 摘要 |
PURPOSE: To reduce the wear of a driving member by engaging a tool receiving part in the working position of a tool deeper in the front area of a tank-like locking part than in the idling position of the rear area. CONSTITUTION: The tank-like locking part 25 of a tool shaft 11 is constituted in such a manner as to be deeper, when axially seen, in the front range than in the rear range in order to enhance the drive. A locking body 19 arranged in the tank-like locking part 25 is arranged so as to be axially slidable within a tool receiving part 16, so that it is engaged deeper in the front range of the tank-like locking part 25 than in the rear range. Therefore, the locking body 19 is guided within the through-hole 18 of the tool receiving part 16 so as to be radially deflected backward in the position locked by a locking sleeve 20. This can be obtained by arranging a spring member 26 for pushing the locking body 19 radially inward between the locking body 19 and the locking sleeve 20. |
