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1. 发明授权

US5787999A Drill bit with set of underreamer arms 失效
标题翻译：钻一点钻头
公开(公告)号：US5787999A
公开(公告)日：1998-08-04
申请号：US674123
申请日：1996-07-01
申请人： Ardis L. Holte
发明人： Ardis L. Holte
IPC分类号： E21B10/26 , E21B4/14 , E21B10/32 , E21B10/36 , E21B10/66 , E21B21/16 , F21B10/66
CPC分类号： E21B21/16 , E21B10/32 , E21B10/36 , E21B10/66 , E21B4/14
摘要： A drill bit assembly includes a driver adapted for attachment to a down hole pneumatic hammer. A pilot bit is coupled to the driver in a manner permitting rotational and axial movement between driver and pilot bit. A series of underreamer arms are disposed intermediate the driver and the pilot bit and engage a centrally disposed cam block on the pilot bit. Pivot pins of the underreamer arms are journaled in and move with the driver during partial rotation of the driver during arm deployment and retraction. Passageways in the driver and pilot bit direct compressed air to the working surface of the bit for discharging particles upwardly through channels in the bit and driver. Inclined surfaces on the underreaming arms cooperate with the lower end of a casing to contribute to arm retraction prior to removal of the assembly through the casing.
摘要翻译：钻头组件包括适于附接到井下气动锤的驱动器。引导位以允许驱动器和引导位之间的旋转和轴向移动的方式联接到驱动器。一系列扩充臂布置在驾驶员和导向钻头之间，并且与引导钻头上的中心布置的凸轮块接合。在手臂部署和撤回期间，在驱动器的部分旋转期间，扩充臂的枢轴引脚被记录并且随着驾驶员移动。驾驶员和驾驶员中的通道将直接压缩空气直接送到钻头的工作表面，以便通过钻头和驱动器中的通道将颗粒向上排放。在通过壳体移除组件之前，在流动臂上的倾斜表面与壳体的下端配合以有助于臂缩回。

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