| 摘要 |
A directional collar to facilitate the pulling and inserting of Natural Gas distribution, piping through underground boreholes or casing extending through such underground boreholes is placed on a section of piping to be pulled through the borehole or casing and having a beveled end that faces the direction the piping is to be pulled and a butt end facing the conventional joining collar so that after the ends of two adjacent piping sections have been secured by the joining collar the piping sections are guided into the borehole with the directional collar disposed adjacent the collar by the resistance of the directional collar against the borehole wall and as the piping sections are pulled through the borehole the beveled end deflects rocks, stones, and other debris away from the joining collar concomitant with the pulling of the piping sections thereby making pulling easier and more consistent.
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