发明名称 |
IMPROVEMENTS IN OR RELATING TO CUTTING ELEMENTS FOR ROTARY DRILL BITS |
摘要 |
A cutting element, for a rotary drill bit, comprises a tablet having a front face, a rear face and a peripheral edge, at least the front face of the tablet being provided by a layer of superhard material, such as polycrystalline diamond. The peripheral edge of the tablet is formed with one or more re-entrant portions so as to define projecting cutting portions to the sides of the re-entrant portions. The element may be cut from a blank which is initially circular. |
申请公布号 |
EP0186408(A3) |
申请公布日期 |
1987.07.01 |
申请号 |
EP19850309156 |
申请日期 |
1985.12.16 |
申请人 |
NL PETROLEUM PRODUCTS LIMITED |
发明人 |
SHIRLEY-FISHER, DAVID NEIL |
分类号 |
E21B10/56;E21B10/567;(IPC1-7):E21B10/56;B23K9/00 |
主分类号 |
E21B10/56 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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