| 摘要 |
PROBLEM TO BE SOLVED: To reduce working processes by forming a shaft hole on the nose part of a main body member integrally formed, and forming a plurality of passages penetrating through the nose part at an agle and crossing with the shaft hole on the nose part. SOLUTION: A main body member is provided with a nose part 20 and a tail part 22. A shaft hole is formed in the nose part 20 of the main body member. The shaft hole is a little larger than the shank of the maximum tool designed to be received by a chuck. Passages 30 are formed in the main body member for receiving respective jaws 18. Hereby, the number of working processes is reduced. By relatively moving a front sleeve member 12 and the diameter spreading part 36 integrally formed with the main body member 16, the jaws 18 are advanced or retreated according to the direction of relative motion of the two members. |
