| 摘要 |
Connection of a bit (15) with two balls (27), (27) is enabled while high operability of attachment and detachment of the bit (15) is maintained. A pressing ring (23) is held at the advance position together with an operation sleeve (22) by a guide washer (24) forced by a coil spring (25). When the rear end of the bit (15) is inserted into a tool holder (8), the balls (27), (27) that are rolled rearward by the contact of the rear end of the bit (15) are pushed in between the pressing ring (23) and the guide washer (24) in order, and the balls (27), (27) can be retracted from the tool holder (8) in the state where the pressing ring (23) is held at the advance position by the tilt of the guide washer (24). |
