发明授权
- 专利标题: Earth-boring bit having an improved hard-faced tooth structure
- 专利标题(中): 钻头具有改进的硬面齿结构
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申请号: US76029申请日: 1993-06-14
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公开(公告)号: US5351769A公开(公告)日: 1994-10-04
- 发明人: Danny E. Scott , Anton F. Zahradnik , Rudolf C. O. Pessier
- 申请人: Danny E. Scott , Anton F. Zahradnik , Rudolf C. O. Pessier
- 申请人地址: TX Houston
- 专利权人: Baker Hughes Incorporated
- 当前专利权人: Baker Hughes Incorporated
- 当前专利权人地址: TX Houston
- 主分类号: E21B10/50
- IPC分类号: E21B10/50 ; E21B10/16
摘要:
An earth-boring bit has a bit body and at least one cutter rotatably secured to the bit body. The cutter has a plurality of teeth formed integrally thereon and arranged in circumferential rows. Each of the teeth includes an inner end, an outer end, a pair of flanks and a crest substantially transversely connecting the ends and flanks. The crests of the at least one of the plurality of teeth has a depression formed therein that extends from the outer end of the tooth to an intermediate point along the crest, a remainder of the crest defines a raised crest portion. A wear-resistant material is applied over at least the crest and a portion of at least the ends and flanks of the at least one of the plurality of teeth, wherein the thickness of the wear-resistant material over the depression is substantially greater than elsewhere on the tooth.
公开/授权文献
- USD410195S Door stop plate 公开/授权日:1999-05-25
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