| 摘要 |
an outside pipe member(10A) having a predetermined diameter(D1) and forming an elastic coupling means(15) inserted attachably/detachably to/from the interior thereof; a first guide(30) having an inserted portion(22) which is inserted into the diameter(D3) of the elastic coupling means(15) of the outside pipe member(10A), on the one side end thereof, the inserted portion(22) forming a spiral path(35)in a circumferential direction on the outer peripheral surface thereof, along which the elastic coupling means(15) can be moved; and an inside pipe member(10B) forming a second guide(40) which is adjacent to the first guide(30) to rotatably mount the elastic coupling means(15). |
