发明名称 |
Spade drill bit construction |
摘要 |
A spade in a bit body is disclosed to have a planar body shaped with two intersecting cutting faces. The cutting faces extend to side faces defining spade width for cutting a hole to gauge. Inserts positioned in the body are at the comer of the spade. The inserts are formed of very hard material, and provide longer life.
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申请公布号 |
US5458211(A) |
申请公布日期 |
1995.10.17 |
申请号 |
US19940197158 |
申请日期 |
1994.02.16 |
申请人 |
DENNIS, THOMAS M.;HUNT, MARK |
发明人 |
DENNIS, THOMAS M.;HUNT, MARK |
分类号 |
B23B51/00;E21B10/54;E21B10/56;E21B10/567;E21B10/58;(IPC1-7):E21B10/58 |
主分类号 |
B23B51/00 |
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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