发明授权
- 专利标题: Multiple-tooth drill bit
- 专利标题(中): 多齿钻头
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申请号: US679750申请日: 1984-12-10
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公开(公告)号: US4645389A公开(公告)日: 1987-02-24
- 发明人: Andreas Maier
- 申请人: Andreas Maier
- 申请人地址: DEX Schwendi-Horenhausen
- 专利权人: Hartmetallwerkzeugfabrik Andreas Maier GmbH & Co.
- 当前专利权人: Hartmetallwerkzeugfabrik Andreas Maier GmbH & Co.
- 当前专利权人地址: DEX Schwendi-Horenhausen
- 优先权: DEX3344620 19831209
- 主分类号: B23B51/00
- IPC分类号: B23B51/00 ; B23B51/02 ; H05K3/00
摘要:
A multiple-toothed drill bit having at least three teeth is provided with front end cutting edges having respective outer and inner cutting edge sections oriented angularly to each other and meeting at respective frontwardmost cutting points located in a common plane, and with an axial centering spur having laterally outwardly and rearwardly inclined center cutting edges merging with the inner front end cutting edge sections via respective frontwardly concave cutting edge sections.
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