发明授权
- 专利标题： Drilling assembly for making boreholes with undercuts
- 专利标题（中）： 钻孔组件用于制作带有切口的钻孔
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申请号： US174094申请日： 1988-03-28
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公开(公告)号： US4815904A公开(公告)日： 1989-03-28
- 发明人: Artur Fischer
- 申请人： Artur Fischer
- 申请人地址： DEX Tumlingen
- 专利权人： fischerwerke Artur Fischer GmbH & Co., KG
- 当前专利权人： fischerwerke Artur Fischer GmbH & Co., KG
- 当前专利权人地址： DEX Tumlingen
- 优先权： DEX3711903 19870408
- 主分类号： B23B41/06
- IPC分类号： B23B41/06 ; B23B51/00 ; B28D1/14 ; B23C1/00
摘要：
A drilling assembly for making boreholes with undercuts comprises a housing receiving a drill receiver driven by a drilling machine, a drill, the shaft of which is connected to the drill receiver, and a sleeve-shaped centering insert protruding from the housing and surrounding the shaft of the drill with a play and having a conical portion the outer diameter of which increases towards the housing.
公开/授权文献
- US5381505A Optical fibers with a light absorbing coating 公开/授权日：1995-01-10
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