| 摘要 |
A drill string coupling for use in coupling together sections of a drill string, said coupling comprising a male part (1) connectable to a drill tool section and a female part (2) connectable to another drill tool section, said male and female parts (1, 2) having interengageable multiple start V-screw threads (12, 16), for releasably interconnecting the male and female parts (1, 2) and to thereby couple the drill string together. |
