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    • 13. 发明专利
    • Excavation tool
    • 挖掘工具
    • JP2013122112A
    • 2013-06-20
    • JP2011269956
    • 2011-12-09
    • Mitsubishi Materials Corp三菱マテリアル株式会社
    • HISADA KIMIYANAKAMURA KAZUYOSHI
    • E21B10/62E21B10/26
    • E21B10/40E21B7/20E21B10/42E21B10/64
    • PROBLEM TO BE SOLVED: To efficiently draw up a casing pipe by making a ring bit insertable/drawable without requiring a second inner bit.SOLUTION: A step part 1B is formed on the tip inner peripheral part of a cylindrical casing pipe 1 with an axis line O as a center. An inner bit 2 in which a contact part 2B capable of abutting on the step part 1B is formed is inserted into the casing pipe 1 from a rear end side in the axis line O direction, a tip 2C of the inner bit 2 is projected from a tip of the casing pipe 1, and an annular ring bit 3 is arranged around the tip 2C. An engaging protrusion 6 drawably provided on the outer periphery of the tip 2C projects and is engaged with an engaging recess 10 of the inner peripheral part of the ring bit 3, and thereby the ring bit 3 is integrally rotatable in the rotation direction of excavation around the axis line O with respect to the inner bit 2 and locked to the tip side in the axis line O direction. The engaging protrusion 6 retracts toward the inner periphery side so that the ring bit 3 can be drawn toward the tip side.
    • 要解决的问题:通过使环钻头可插入/拉伸而不需要第二内钻头来有效地拉制套管。 解决方案:以轴线O为中心的圆筒形套管1的顶端内周部形成台阶部1B。 形成有能够抵接在台阶部1B上的接触部2B的内部钻头2从轴线O方向的后端侧插入到套管1内,内钻头2的前端2C从 套管1的顶端和环形圈3围绕尖端2C布置。 可滑动地设置在尖端2C的外周上的接合突起6突出并与环形钻头3的内周部的接合凹部10接合,从而环钻头3沿着挖掘的旋转方向一体地旋转 相对于内钻头2的轴线O并且在轴线O方向上被锁定到尖端侧。 接合突起6朝向内周侧缩回,使得环钻头3能够朝向尖端侧拉出。 版权所有(C)2013,JPO&INPIT