Extendable bit
    1.
    发明授权
    Extendable bit 失效
    可扩展位

    公开(公告)号:US5881827A

    公开(公告)日:1999-03-16

    申请号:US800182

    申请日:1997-02-13

    CPC分类号: E21B7/208 E21B10/62

    摘要: Extendable bit teeth are supported by the guide grooves formed on the end face at the point of a bit body in such a manner as to be slidable. The extendable bit teeth slide along the guide grooves in an excavating direction to thereby project from the end face at the point of the bit body. The extendable bit teeth slide in an opposite direction to the excavating direction to project from the outer periphery of the point of the bit body. Since the extendable bit teeth are pressed against the ground during excavation, the extendable bit teeth projects from the outer periphery of the point of the bit body so that the bit gauge can be extended, and most of the excavation hole is excavated by the bit body.

    摘要翻译: 可扩展的钻头齿以可滑动的方式由钻头体的端部上的端面上形成的引导槽支撑。 可延伸的钻头齿沿着引导槽在挖掘方向上滑动,从而从钻头体的端部处的端面突出。 可延伸的钻头齿沿与挖掘方向相反的方向滑动,从钻头体的点的外周突出。 由于在挖掘期间可伸长的钻头齿被压靠在地面上,所以可延伸的钻头齿从钻头体的点的外周突出,使得钻头位置能够延伸,大部分挖掘孔由钻头体 。