| 摘要 |
The invention relates to a threaded cylindrical member, which may be used for a segmented drilling tube. The member has opposing first and second ends and a central axis between said ends. The first end is threaded with a pin thread comprising a pressure flank, a crest and a root. The second end is threaded with a box thread comprising a pressure flank, a root, wherein said pin and box threads are configured whereby when threaded together a portion of the root of said pin thread is out of contact with the crest of said box thread to leave gap therebetween. The secondary geometries of the pin and box threads are configured to generate an interference fit between the pin and box threads. The roots and crests of the pin and box threads define parallel tapering conical frustrums that differ from each other in their taper angles. |
