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 flute portion has at least one flute with a helix angl
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 flute portion has at least one flute with a helix angle between approximately 30° and 35°. The working end has a pilot tip with a cutting portion. A tapered web is formed in the flute portion, a thickness of the web at the tip of the working end is about 9% to 15% of the nominal diameter.
대표청구항▼
1. An elongated drill bit with a longitudinal axis comprising: a shank at a first end having a nominal diameter that is between 13/64 inch and ¼ inch, between 17/64 inch and 21/64 inch, or between 11/32 inch and ½ inch;a working end at a second end;a flute portion between the shank and the working e
1. An elongated drill bit with a longitudinal axis comprising: a shank at a first end having a nominal diameter that is between 13/64 inch and ¼ inch, between 17/64 inch and 21/64 inch, or between 11/32 inch and ½ inch;a working end at a second end;a flute portion between the shank and the working end, with the shank, the working end and the flute portion continuous with one another, the flute portion including at least one flute at a helix angle of approximately 30° to 35°,the working end comprises a pilot tip with a first cutting portion and a second cutting portion axially spaced from the first cutting portion, at a terminus of the flute portion, and including a pair of cutting edges on opposing sides of the pilot tip; anda tapered web formed in the flute portion, where a thickness of the web at the tip of the working end is between 13% and 14% of the nominal diameter if the nominal diameter is between 13/64 inch and ¼ inch, is between 11% and 12% of the nominal diameter if the nominal diameter is between 17/64 inch and 21/64 inch, or is between 9% and 10% of the nominal diameter if the nominal diameter is between 11/32 inch and ½ inch. 2. The drill bit of claim 1, wherein a thickness of the web at the shank is approximately 55% to 76% of the nominal diameter. 3. The drill bit of claim 2, wherein the drill bit has a nominal diameter of 17/64 inch or less and the web thickness at the shank is approximately 68% to 76% of the nominal diameter. 4. The drill bit of claim 2, wherein the drill bit has a nominal diameter between 9/32 inch and ⅜ inch and the web thickness at the shank is approximately 61% to 65% of the nominal diameter. 5. The drill bit of claim 2, wherein the drill bit has a nominal diameter 25/64 inch or larger and the web thickness at the shank is about 55% to 60% of the nominal diameter. 6. The drill bit of claim 1, wherein the web taper rate is approximately 0.070 to 0.074. 7. The drill bit of claim 1, wherein the helix angle is approximately 34.5°. 8. The drill bit of claim 1, wherein the working end and at least a portion of the flute portion is formed of a first metal section, and the shank is formed of a second metal section that is welded to the first metal section, the second metal section having a hardness that is lower than a hardness of the first metal section. 9. The drill bit of claim 8, wherein a length to diameter ratio of the first metal section is between approximately 0.7 and 3.0. 10. The drill bit of claim 8, wherein the hardness of the first metal section is at least approximately 65 HRc. 11. The drill bit of claim 10, wherein the hardness of the second metal section is approximately 45-55 HRc. 12. The drill bit of claim 8, wherein at least one of the first and second metal sections is heat treated so as to have a recognizable different appearance than the other of the first and second metal sections. 13. A set of drill bits comprising: a first drill bit having a first nominal diameter, a second drill bit having a second nominal diameter, and a third drill bit having a third nominal diameter, each of the drill bits having a shank at a first end, a working end at a second end, and a flute portion between the shank and working end, where the shank, the flute portion, and the working end are continuous with one another, and the flute portion has at least one flute with a helix angle of approximately 30° to 35° and a tapered web,wherein the first drill bit has a nominal diameter of 13/64 inch to ¼ inch and a thickness of the web at the working end of approximately 13% to 14% of the nominal diameter,wherein the second drill bit has a nominal diameter between 17/64 inch and 21/64 inch and a thickness of the web at the working end of approximately 11% to 12% of the nominal diameter, andwherein the third drill bit has a nominal diameter greater than or equal to 11/32 inch and a thickness of the web at the working end of approximately 9% to 10% of the nominal diameter. 14. The set of drill bits of claim 13, wherein the first drill bit has a web thickness at the shank of approximately 68% to 76% of the nominal diameter, the second drill bit has a web thickness at the shank is approximately 61% to 65% of the nominal diameter, and the third drill bit has a web thickness at the shank is about 55% to 60% of the nominal diameter. 15. The set of drill bits of claim 13, wherein the web of each drill bit has a web taper rate of approximately 0.070 to 0.074. 16. The set of drill bits of claim 13, wherein the helix angle of each drill bit is approximately 34.5°. 17. The set of drill bits of claim 13, wherein at least one of the drill bits has the working end and at least a portion of the flute portion formed of a first metal section, and has the shank formed of a second metal section that is welded to the first metal section, the first metal section having a first material hardness that is higher than a second material hardness of the second metal section. 18. An elongated drill bit with a longitudinal axis comprising: a shank at a first end having a nominal diameter that is between 17/64 inch and 21/64 inch or that is 11/32 inch or greater;a working end having a cutting portion at a second end;a flute portion between the shank and the working end, with the shank, the working end and the flute portion continuous with one another, the flute portion including at least one flute at a helix angle of approximately 30° to 35°; anda tapered web formed in the flute portion, where a thickness of the web at the working end is between 11% and 12% of the nominal diameter if the nominal diameter is between 17/64 inch and 21/64 inch, or is between 9% and 10% of the nominal diameter if the nominal diameter is 11/32 inch or greater,wherein the working end and at least a portion of the flute portion is formed of a first metal section, and the shank is formed of a second metal section that is resistance welded to the first metal section, the second metal section having a second hardness that is lower than a first hardness of the first metal section.
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (79)
Brace Regie P. (Lot 33 ; Bert\s Trailer Park ; 401 S. Rte. 7 Milton VT 05468), Axe maul apparatus.
Choe, Heeman; Stevens, John H.; Overstreet, James L.; Westhoff, James C.; Eason, Jimmy W., Earth-boring rotary drill bits including bit bodies comprising reinforced titanium or titanium-based alloy matrix materials, and methods for forming such bits.
Choe, Heeman; Stevens, John H.; Westhoff, James C.; Eason, Jimmy W.; Overstreet, James L., Earth-boring rotary drill bits including bit bodies having boron carbide particles in aluminum or aluminum-based alloy matrix materials, and methods for forming such bits.
Choe, Heeman; Stevens, John H.; Westhoff, James C.; Eason, Jimmy W.; Overstreet, James L., Methods of forming earth-boring rotary drill bits including bit bodies having boron carbide particles in aluminum or aluminum-based alloy matrix materials.
Turri, Achille, Security device comprising a stop member for drilling instrument used in particular in dental surgery and device pre-calibrating and storing drilling depth.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.