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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
---|---|
국제특허분류(IPC7판) |
|
출원번호 | US-0539831 (2009-08-12) |
등록번호 | US-8740515 (2014-06-03) |
발명자 / 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 | 피인용 횟수 : 7 인용 특허 : 16 |
A combination drill bit for use in both hand held drills and stationary drill presses has a shanking end, a working end and a helical flute portion between the shanking and working ends. The helical portion has a helix length (L) of L=(D×πtanα). The drill bit has a core that is tapered from the wo
1. A drill bit comprising: a shanking end;a working end;a helical flute portion between said shanking end and said working end, said helical flute portion having a web tapered from said working end to said shanking end such that a web thickness at said working end is from 10% to 35% of the drill bit
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