| 摘要 |
<p>PURPOSE: To prevent the vertical collision of a cable head against a pipe bottom by a method wherein an opening section is formed to one side at the front end section of an inserting guide cylinder, a plurality of freely rotatable guide rollers are mounted on an internal surface on the other side of the opening section in the direction of an axial center, and outer circumferential surfaces are displaced and arranged to the opening section side in the rollers nearer to the front end section. CONSTITUTION: An opening section 6, in which approximately the half of a peripheral wall is notched, is formed to one side of the front end section of an inserting guide cylinder 4, and a plurality of guide rollers 7 are installed to the internal surface of the other side in the axial direction. The diameters of the guide rollers 7 are increased in the guide rollers 7 nearer to the front end section, and the places of the mounting of each guide roller 7 are displaced and set gradually to the opening section 6 side in the guide rollers 7 nearer to the front end section by changing the length of a bracket. Accordingly, outer circumferential surfaces are displaced and disposed to the opening section 6 side in the guide rollers 7 at lower places. When a cable head reaches the front end section of the inserting guide cylinder 4, the head is abutted against the outer circumferential surfaces of each guide roller, and guided so as to be inclined towards the opening section side towards the front end of the inserting guide cylinder 4.</p> |
