| 摘要 |
PROBLEM TO BE SOLVED: To provide an attaching method for a middle shaft to be mounted to an outer shaft whereby it is possible to assure a wide applicable rang and good working efficiency without worsening the appearance. SOLUTION: The middle shaft 32 is inserted into the outer shaft 30, and an inner shaft 46 is inserted into the outer and middle shafts 30 and 32, a male threaded portion 46b formed on a tapered surface 46c on the peripheral surface of the inner shaft 46 is engaged with a femal threaded portion 32c formed on the inside surface of the middle shaft 32, followed by pushing wide a slit 32d formed in that part of middle shaft 32 where the female threads are provided, and that part on the middle shaft 32 is widened outward in the diametric direction to be pressed to the inside surface of the outer shaft 30, and thereby the middle shaft 32 is attached to the inside of the outer shaft 30. |
