| 摘要 |
<p>The invention provides an extension device for which productivity is excellent and production costs can be reduced. The extension device 12 includes the first tubular member 16, the second tubular member 17 movably inserted into the first tubular member 16, and the third tubular member 18 movably inserted into the second tubular member 17. The extension device 12 includes regulating means 22 for regulating movement of the third tubular member 18 with respect to the second tubular member 17. The regulating means 22 includes a regulatingmember 31 that protrudes from the inner hole portion 26 to the outside of the third tubular member 18 by movement in the protruding direction and is brought in the outer hole portion 24, and a pressing member for pressing the regulating member 31 in the protruding direction. When the protruded regulating member 31 is brought into contact with the end part 16a in the axial direction of the first tubular member 16 during the course of a contracting motion of the extension device 12, the regulating member 31 is caused to escape from the outer hole portion 24 by further movement of the second tubular member 17 in the non-protruding direction based on pressing based on the circumferential edge of the outer hole portion 24 after the regulating member 31 moves in the non-protruding direction by the pressing by means of the end part 16a in the axial direction.</p> |
