| 发明名称 |
DRILL BIT, HARD MEMBER, AND BIT BODY |
| 摘要 |
A rotary drill bit for penetrating earth strata wherein the drill bit includ es a drill bit body (22) that has an axial forward end (24). The drill bit body has a hard insert (56), which is preferably monolithic, that is affixed to the drill bi t body at the axial forward end thereof. The hard insert presents at least three discrete leadin g cutting edges for cutting the earth strata. <IMG>
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| 申请公布号 |
CA2406731(C) |
申请公布日期 |
2009.03.03 |
| 申请号 |
CA20012406731 |
申请日期 |
2001.01.26 |
| 申请人 |
KENNAMETAL INC. |
发明人 |
HAGA, PHILLIP W.;DUNN, CURNIE A.;MASSA, TED R.;RUTHERFORD, JAMES E.;BISE, DOUGLAS E.;BELSHEIM, STEPHEN T.;CONDON, GARY J. |
| 分类号 |
E21B10/58;B23B31/00;B23B51/00;B23B51/02;B23Q11/00;E21B10/44;E21B10/54;E21B10/55;E21B10/60 |
主分类号 |
E21B10/58 |
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