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    • 2. 发明申请
    • HAMMER IMPROVEMENTS
    • HAMMER改进
    • WO2013108127A2
    • 2013-07-25
    • PCT/IB2013/000433
    • 2013-01-17
    • SANDVIK INTELLECTUAL PROPERTY AB
    • HILL, Raymond
    • E21B10/38
    • E21B17/076E21B10/36
    • This invention relates to a down-the-hole hammer drill, and has particular application (but need not be limited) to a reverse-circulation (RC) down-hole face sampling hammer drill. More particularly, a bit for the percussive down-the-hole hammer comprises an elongate shank, a head, at least one channel extending lengthwise along the shank toward the head, wherein the width of the or each channel is reduced at a position toward the head, so as to create a narrower channel portion extending from this position to the head, and a wider channel portion extending to this position, and define at this position a contact area in an end of the wider channel portion for contact between the bit and a portion of a driver for the bit. An associated percussive down-the-hole hammer comprising a splined drive sub, is also disclosed.
    • 本发明涉及一种井下锤钻,并且具有特别的应用(但不限于)反向循环(RC)井下采样锤钻。 更具体地,用于冲击式井下锤的钻头包括细长的柄部,头部,至少一个沿颈部沿头向长度方向延伸的通道,其中,每个通道的宽度在朝向 头部,以便形成从该位置延伸到头部的较窄通道部分,以及延伸到该位置的较宽通道部分,并且在该位置处限定较宽通道部分的端部中的接触区域,以在钻头和 一部分司机的位。 还公开了一种包括花键驱动副的相关联的冲击式井下锤。