IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0268701
(2005-11-07)
|
등록번호 |
US-7520703
(2009-07-01)
|
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
Harness, Dickey & Pierce, P.L.C.
|
인용정보 |
피인용 횟수 :
14 인용 특허 :
10 |
초록
▼
An elongated drill bit has a shank at one end and working end at the other. A flute portion is between the working end and the shank. The flute portion is continuous with the shank and working end and is generally unitarily formed with them. The working end has a pilot tip with a first cutting porti
An elongated drill bit has a shank at one end and working end at the other. A flute portion is between the working end and the shank. The flute portion is continuous with the shank and working end and is generally unitarily formed with them. The working end has a pilot tip with a first cutting portion. A second cutting portion is at the terminus of the flute portion and is axially spaced from the pilot tip first cutting portion. The second cutting portion includes a pair of cutting edges on opposing sides of the pilot tip. Each of the second cutting edges is on an angle from about 22° to 27° to a line transverse to the longitudinal axis. The cutting edges are defined by the junction of a rake face, defined by the flute surface, and a primary clearance face. Also, a secondary clearance face may be present which is continuous with the primary face at a different angle. The angle is about 50° to 65° with respect to the longitudinal axis.
대표청구항
▼
What is claimed is: 1. An elongated drill bit with a longitudinal axis comprising: a shank at one end; a working end at one end; a flute portion between said shank and working end, said shank, working end and flute section continuous with one another; the working end comprises a pilot tip with a fi
What is claimed is: 1. An elongated drill bit with a longitudinal axis comprising: a shank at one end; a working end at one end; a flute portion between said shank and working end, said shank, working end and flute section continuous with one another; the working end comprises a pilot tip with a first cutting portion having a rake face and a second cutting portion axially spaced from said pilot tip first cutting portion, said second cutting portion at a terminus of said flute portion, said second cutting portion includes a pair of cutting edges on opposing sides of said pilot tip; said second cutting edge are on an angle of about 22° to about 27° from a line transverse to said longitudinal axis, said second cutting edge is formed at the junction of a rake face defined by a surface of said flute adjacent said cutting edge, and a primary clearance face, adjacent said second cutting edge, a secondary clearance face continuous with said primary clearance face, said rake face of said first cutting portion is co-planar with said secondary clearance face. 2. The drill bit according to claim 1, further comprising said secondary clearance face on an angle of about 50° to 65° with respect to said longitudinal axis. 3. The drill bit according to claim 2, wherein a clearance face of said first cuffing portion is co-planar with said secondary clearance face. 4. The drill bit according to claim 1, wherein said flute surface is on an angle of about 30° to 40° with respect to said longitudinal axis. 5. The drill bit according to claim 4, wherein said primary clearance face is on an angle with respect to a line transverse to said longitudinal axis from about 8° to 12°. 6. An elongated drill bit with a longitudinal axis comprising: a shank at one end; a working end at one end; a flute portion between said shank and working end, said shank, working end and flute section continuous with one another; the working end comprises a pilot tip with a first cutting portion and a second cutting portion axially spaced from said pilot tip first cutting portion and at a terminus of said flute portion, said second cuffing portion includes a pair of cutting edges on opposing sides of said pilot tip; each said second cuffing edge defined by the junction of a rake face, on a surface of said flute, and a primary clearance face, adjacent said second cuffing edge; and a secondary clearance face continuous with said primary clearance face, said secondary clearance face on an angle of about 50° to 65° with respect to said longitudinal axis and said secondary clearance face co-planar with a rake face of said first cutting portion. 7. The drill bit according to claim 6, wherein said first cutting portion includes a pair of inner and a pair of outer cuffing edges. 8. The drill bit according to claim 6, wherein said flute surface is on an angle of about 30° to 40° with respect to said longitudinal axis. 9. The drill bit according to claim 8, wherein said primary clearance face is on an angle with respect to a line transverse to said longitudinal axis from about 80° to 12°. 10. An elongated drill bit with a longitudinal axis comprising: a shank at one end; a working end at one end; a flute portion between said shank and working end, said shank, working end and flute section continuous with one another; the working end comprises a pilot tip with a first cutting portion and a second cutting portion axially spaced from said pilot tip first cutting portion, said second cuffing portion at a terminus of said flute portion, said second cuffing portion includes a pair of cuffing edges on opposing sides of said pilot tip, said second cuffing edges are substantially on a plane passing through said longitudinal axis; said second cuffing edge are on an angle of about 22° to about 27° from a line transverse to said longitudinal axis, said second cuffing edge is formed at the junction of a rake face defined by a surface of said flute adjacent said cutting edge, and a primary clearance face, adjacent said second cuffing edge. 11. An elongated drill bit with a longitudinal axis comprising: a shank at one end; a working end at one end; a flute portion between said shank and working end, said shank, working end and flute section continuous with one another; the working end comprises a pilot tip, with a first cutting portion and a second cutting portion axially spaced from said pilot tip first cuffing portion and at a terminus of said flute portion, said second cuffing portion includes a pair of cutting edges on opposing sides of said pilot tip, both said second cuffing edges are substantially on a plane passing through said longitudinal axis; each said second cuffing edge defined by the junction of a rake face, on a surface of said flute, and a primary clearance face, adjacent said second cutting edge; and a secondary clearance face continuous with said primary clearance face, said secondary clearance face on an angle of about 50° to 65° with respect to said longitudinal axis.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.