| 摘要 |
<p>The present invention relates to a thread joint, including a male portion and a female portion, for percussive drilling. The thread joint (10) includes a male portion and a female portion for percussive drilling. The threaded joint forms a center flush channel (20) and comprises at least one external thread and at least one internal thread. The external thread is provided on a spigot (12) which has at least one impact surface (16). The internal thread is provided in a socket which has at least one impact surface (18). The at least one impact surface of the spigot (12) and the at least one impact surface of the socket are shaped to lie on an imaginary sphere (35).</p> |
