| 摘要 |
A tool joint comprising a male member a female member. The male member having a coupling portion rearwardly from a body portion. The coupling portion having a frustoconical forward portion and a threaded rear portion. The thread having an intermediate section of uniform depth and terminating in forward and rear end parts. The female member having a bore extending rearwardly from a front surface. The bore having a frustoconical forward portion and a threaded rear portion. The thread having an intermediate section of uniform depth and terminating in forward and rear end parts. Upon threaded coupling of the male and female members to form a tool joint connection, the threaded portion of the male member engages the threaded portion of the female member. |
