GB427654A - Improvements in and relating to rotary drills - Google Patents
Improvements in and relating to rotary drillsInfo
- Publication number
- GB427654A GB427654A GB3171133A GB3171133A GB427654A GB 427654 A GB427654 A GB 427654A GB 3171133 A GB3171133 A GB 3171133A GB 3171133 A GB3171133 A GB 3171133A GB 427654 A GB427654 A GB 427654A
- Authority
- GB
- United Kingdom
- Prior art keywords
- drill
- cut
- saw
- relating
- drills
- 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
- B23B2251/00—Details of tools for drilling machines
- B23B2251/18—Configuration of the drill point
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/46—Drills having a centre free from cutting edges or with recessed cutting edges
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Drilling Tools (AREA)
Abstract
427,654. Drills. ESCARE, C. M., 14, Bardwell Street, Holloway, London. Nov. 14, 1933, No. 31711. [Class 83 (iii)] A rotary drill for making holes in brick, concrete, tiles, &c., for the reception of bushes to receive screws &c., comprises a twist drill a with double threaded flutes b, b<1> and having a central saw-cut e in the end. The saw-cut is preferably made through the web of the drill to a depth of about the diameter of the drill. The end of the drill is sharply chamfered at c and is grooved at d to provide serrations on the cutting edges. Subsidiary cuts may also be made in the end of the drill, either parallel to the drill axis or at an angle thereto.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3171133A GB427654A (en) | 1933-11-14 | 1933-11-14 | Improvements in and relating to rotary drills |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3171133A GB427654A (en) | 1933-11-14 | 1933-11-14 | Improvements in and relating to rotary drills |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB427654A true GB427654A (en) | 1935-04-29 |
Family
ID=10327262
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3171133A Expired GB427654A (en) | 1933-11-14 | 1933-11-14 | Improvements in and relating to rotary drills |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB427654A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2673714A (en) * | 1950-08-05 | 1954-03-30 | John M Hargrave | Rock or masonry drill |
| CN108098023A (en) * | 2016-11-24 | 2018-06-01 | 丹阳市宏光机械有限公司 | A kind of double end diamond bit |
-
1933
- 1933-11-14 GB GB3171133A patent/GB427654A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2673714A (en) * | 1950-08-05 | 1954-03-30 | John M Hargrave | Rock or masonry drill |
| CN108098023A (en) * | 2016-11-24 | 2018-06-01 | 丹阳市宏光机械有限公司 | A kind of double end diamond bit |
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