| 摘要 |
<p>PURPOSE:To provide an in-conduit-line self traveling device where the frictional locking force is great to the inwall face of a conduit, accordingly, the driving force also is great, and the radial expanses at contraction of front and rear locking parts are small, and the traveling inside a conduit line is excellent. CONSTITUTION:A back board 26, which receives the pressure at the time of these expanses, is provided on the inside in radial direction of each expansive and contractive body 23 and 24. Accordingly, when each expansive and contractive body 23 and 24 expands, this hits against the back board 26, and supporting shafts 23A, 23B, 24A, and 24B shift outward in radial direction, and come closer to the inwall of the conduit line 1, and the expansive and contractive bodies 23 and 24 are pressure-welded strongly to the inwall of the conduit line. Reversely, when they contract, the expansive and contractive bodies 23 and 24 contact and also the supporting shafts 23A, 23B, and 24A, and 24B shift inward in radial direction, and the expanse in radial direction becomes small as a device at large, and the traveling inside the conduit line becomes easy.</p> |
