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    • 9. 发明授权
    • Drill rod, drill bit, and drilling tool
    • 钻杆,钻头和钻具
    • US07942216B2
    • 2011-05-17
    • US12092134
    • 2006-11-21
    • Masaya HisadaMasahiro KoizumiTakashi Suzuki
    • Masaya HisadaMasahiro KoizumiTakashi Suzuki
    • E21B17/042E21B17/04
    • E21B10/36E21B17/042
    • A drill rod has a fitting portion protruding toward the distal end of the drill rod. The drill rod fitting portion further encompasses a parallel male thread portion in which a minimum distance from a first axial line in a cross-section perpendicular to the first axial line is constant; and a male thread ending portion is continuous with a proximal end of the parallel male thread portion. The minimum distance of the ending portion increases as a proximal end is approached. Furthermore, the fitting portion is formed such that the minimum distance does not decrease as the proximal end is approached from a distal end thereof. Additionally, the proximal end of the male thread ending portion is positioned where a distance from the first axial line gradually increases as the proximal end of the male thread ending portion is approached from the parallel male thread.
    • 钻杆具有朝向钻杆的远端突出的配合部分。 钻杆配合部分还包括平行的阳螺纹部分,其中垂直于第一轴线的横截面中的第一轴线的最小距离是恒定的; 并且阳螺纹结束部分与平行阳螺纹部分的近端连续。 当接近近端时,终端部分的最小距离增加。 此外,装配部分形成为使得最小距离不会随着近端从其远端接近而减小。 此外,当阳螺纹结束部分的近端从平行的外螺纹接近时,阳螺纹端部的近端位于与第一轴线的距离逐渐增加的位置。