| 摘要 |
PURPOSE:To obtain an internal tube traveller which is light and highly resistant to effect of irregularities of an internal surface, by retaining a retaining member on a tube material with the supply of a pressure fluid to be driven by an elastic compression body of an air bag type. CONSTITUTION:A retaining member 14 is fed with a pressure fluid ahead in the direction of travelling and expanded to fix a front frame 1 retaining it on an inner surface of a tube material. Then, when the pressure fluid is applied to elastic compression bodies, each compression body is deformed in an expanded diameter and compressed along the axis line of the elastic compression body 4 so that a rear frame 1 is drawn forward. Then, the pressure fluid is supplied to a rear retaining member 14 to fix the rear frame 1 on the tube material retaining it on the inner surface thereof and then, the pressure fluid is discharged from the front retaining member 14 and the elastic compression body 4. In this manner, by an elastic return force of a compression spring 18, the front frame 1 is pushed forward in the direction of travelling. According to the same procedure, the apparatus can advance along the inner wall of the tube material. |
