GB1194157A - Improvements in or relating to Drills. - Google Patents
Improvements in or relating to Drills.Info
- Publication number
- GB1194157A GB1194157A GB22425/68A GB2242568A GB1194157A GB 1194157 A GB1194157 A GB 1194157A GB 22425/68 A GB22425/68 A GB 22425/68A GB 2242568 A GB2242568 A GB 2242568A GB 1194157 A GB1194157 A GB 1194157A
- Authority
- GB
- United Kingdom
- Prior art keywords
- drill
- points
- lines
- point
- radius
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B51/00—Tools for drilling machines
- B23B51/02—Twist drills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B51/00—Tools for drilling machines
- B23B51/0002—Drills with connected cutting heads, e.g. with non-exchangeable cutting heads; Drills with a single insert extending across the rotational axis and having at least two radially extending cutting edges in the working position
- B23B51/0003—Drills with connected cutting heads, e.g. with non-exchangeable cutting heads; Drills with a single insert extending across the rotational axis and having at least two radially extending cutting edges in the working position with exchangeable heads or inserts
- B23B51/00035—Spade drills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2200/00—Details of cutting inserts
- B23B2200/20—Top or side views of the cutting edge
- B23B2200/202—Top or side views of the cutting edge with curved cutting edge
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/18—Configuration of the drill point
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Drilling Tools (AREA)
Abstract
1,194,157. Drills. RADIAL LIP DRILL CORP. 10 May, 1968 [11 May, 1967; 14 Feb., 1968], No. 22425/68. Heading B3C. A drill comprises cutting lips 34, 36, Fig. 3, formed by continuous curves which merge tangentially with the periphery 42, 43 of the drill, and also with the lines 40, 41, which form the point angle of a conventional drill. To construct each of the curves 34, 36, angle α is bisected, and point D lies on this line. Radius R is drawn from point A, and equals the length AB, and this radius crosses lines 42 and 43 at points C. A line drawn between points C intersects the bisectors at points D. Radius R1, which is equal to the length CD is drawn, from each point D, tangential with lines 41, 43, and 40, 42, to thus form cutting lips 34, 36. In a modification, the cutting lips are tangential to lines 40, 41 at points remote from points B. In a further modification, the curves are ellipsoidal. The rounded outer edge 25, Fig. 6, of the lips may be removed to form flats 29. The drill may be a spade drill, Figs. 7, 8, with a carbide or steel tip, and may have cutting clearances 70. The drill 80, Fig. 15, may have first, second, and third relief 90, 92, 95, or four reliefs may be provided.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US63782067A | 1967-05-11 | 1967-05-11 | |
US71439368A | 1968-02-14 | 1968-02-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1194157A true GB1194157A (en) | 1970-06-10 |
Family
ID=27092929
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB22425/68A Expired GB1194157A (en) | 1967-05-11 | 1968-05-10 | Improvements in or relating to Drills. |
Country Status (5)
Country | Link |
---|---|
CH (1) | CH497229A (en) |
DE (1) | DE1752261A1 (en) |
FR (1) | FR1581521A (en) |
GB (1) | GB1194157A (en) |
SE (1) | SE334791B (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2184046A (en) * | 1985-12-13 | 1987-06-17 | Skf & Dormer Tools | Twist drill |
DE4205059A1 (en) * | 1991-04-06 | 1992-10-08 | Yamahiro Kawachinagano Kk | Self-tapping screw with two=stage cutting edge - has end of shank formed as drill bit with stepped cutting edges |
EP2265402A2 (en) * | 2008-03-10 | 2010-12-29 | Kennametal Inc. | Cutting tool with chisel edge |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE504312C2 (en) * | 1994-10-28 | 1997-01-13 | Sandvik Ab | Method of working composites |
JP3874774B2 (en) | 2004-08-19 | 2007-01-31 | オーエスジー株式会社 | Cast hole drill |
-
1968
- 1968-04-24 CH CH616868A patent/CH497229A/en not_active IP Right Cessation
- 1968-04-26 DE DE19681752261 patent/DE1752261A1/en active Pending
- 1968-04-29 SE SE05790/68A patent/SE334791B/xx unknown
- 1968-05-06 FR FR1581521D patent/FR1581521A/fr not_active Expired
- 1968-05-10 GB GB22425/68A patent/GB1194157A/en not_active Expired
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2184046A (en) * | 1985-12-13 | 1987-06-17 | Skf & Dormer Tools | Twist drill |
GB2184046B (en) * | 1985-12-13 | 1990-01-24 | Skf & Dormer Tools | Twist drill |
DE4205059A1 (en) * | 1991-04-06 | 1992-10-08 | Yamahiro Kawachinagano Kk | Self-tapping screw with two=stage cutting edge - has end of shank formed as drill bit with stepped cutting edges |
EP2265402A2 (en) * | 2008-03-10 | 2010-12-29 | Kennametal Inc. | Cutting tool with chisel edge |
EP2265402A4 (en) * | 2008-03-10 | 2014-05-07 | Kennametal Inc | Cutting tool with chisel edge |
Also Published As
Publication number | Publication date |
---|---|
SE334791B (en) | 1971-05-03 |
DE1752261A1 (en) | 1971-09-30 |
CH497229A (en) | 1970-10-15 |
FR1581521A (en) | 1969-09-19 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB825308A (en) | A rotary drill | |
GB1463785A (en) | Spade drill bit | |
GB1140844A (en) | Improved cutting tool bit | |
GB1144035A (en) | Twist drill | |
GB1395855A (en) | Twist drill | |
GB1163371A (en) | Improvements in and relating to Screws | |
GB1194157A (en) | Improvements in or relating to Drills. | |
GB1432546A (en) | Twist drills | |
GB1218336A (en) | Fluted coulter disc blade and method of making same | |
JPS57127608A (en) | Cutting tool | |
GB1107944A (en) | Ball-point pens | |
GB1219119A (en) | Method for cutting sharp angles in material | |
GB1146403A (en) | Improvements in drill bits | |
GB1388715A (en) | Structural element | |
GB1418273A (en) | Hole-making tool | |
GB765651A (en) | Improvements in or relating to drills | |
GB1344053A (en) | Milling cutters and milling cutter blanks | |
USD261981S (en) | Fastener rotating tool | |
GB940206A (en) | Improvements relating to drills | |
GB1062158A (en) | Improvements relating to drills | |
GB1149425A (en) | Improvements in or relating to externally pressurised bearings | |
GB1022247A (en) | Drill | |
GB1210963A (en) | Improvements relating to nuts and bolts | |
GB835244A (en) | A drill grinding machine | |
GB1349873A (en) | Mining machine rotary cutting head |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PLE | Entries relating assignments, transmissions, licences in the register of patents | ||
PLNP | Patent lapsed through nonpayment of renewal fees |