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1. 发明授权

US07891443B2 Hardfacing around ball loading hole for earth-boring bit 有权
标题翻译：围绕钻孔加载孔的地面钻孔位置
公开(公告)号：US07891443B2
公开(公告)日：2011-02-22
申请号：US12032334
申请日：2008-02-15
申请人： Alan J. Massey , David K. ‘Keith’ Luce , Keith L. Nehring
发明人： Alan J. Massey , David K. ‘Keith’ Luce , Keith L. Nehring
IPC分类号： E21B10/46
CPC分类号： E21B10/08 , E21B10/22 , E21B10/46
摘要： A rotary cone earth boring bit has at least one bit leg with a cone retaining ball passage that intersects an outer surface of the bit leg and is closed by a ball plug. An upwardly curved lower hardfacing bead is on the outer surface of the bit leg at least partially below the ball plug. A downwardly curved upper hardfacing bead is on the outer surface of the bit leg at least partially above the ball plug. The upper hardfacing bead has leading and trailing ends that join the lower hardfacing bead. The upper and lower hardfacing beads define a generally elliptical perimeter surround the ball plug. At least one transverse bead is above the upper hardfacing bead and leads generally upwardly and circumferentially from a leading edge of the bit leg to a trailing edge of the bit leg.
摘要翻译：旋转圆锥钻头具有至少一个具有锥形保持球通道的钻头，其与钻头腿的外表面相交并且由球塞封闭。向上弯曲的下部表面硬化的胎圈至少部分地位于球塞的下方的位腿的外表面上。一个向下弯曲的上部硬质合金焊道至少部分地位于球塞上方的位腿的外表面上。上部表面硬化珠具有连接下部表面硬化珠的前端和后端。上部和下部表面硬化珠围绕球塞限定一般为椭圆形的周边。至少一个横向胎圈在上部硬化胎圈上方，并且大体向上并周向地从钻头腿的前缘引导到钻头刀腿的后缘。

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