| 摘要 |
<p>Attachment of a coupling to an end of a polyethylene pipe comprising a tubular insert (11, 30) to be introduced into the pipe end (10), and a coupling part (16, 39) to be advanced rotationally over the pipe end. The coupling part (16, 38) has an internal helical track which, when driven onto the pipe end, and by virtue of guide means (14, 35) forms a corresponding helical track or groove in the outer wall surface of the pipe end so that the coupling part and the pipe end become threadedly interengaged. The outer wall of the pipe end within the coupling part (16, 38) is thus captively retained by the helical track of the coupling part thus preventing creep of the polyethylene material form the assembly and maintaining the integrity of the pipe end coupling.</p> |
