IT1059711B - Percussion drill bit with one or more cutting edges - has bottomed central hole with conical surface to match rod taper portion - Google Patents
Percussion drill bit with one or more cutting edges - has bottomed central hole with conical surface to match rod taper portionInfo
- Publication number
- IT1059711B IT1059711B IT2220276A IT2220276A IT1059711B IT 1059711 B IT1059711 B IT 1059711B IT 2220276 A IT2220276 A IT 2220276A IT 2220276 A IT2220276 A IT 2220276A IT 1059711 B IT1059711 B IT 1059711B
- Authority
- IT
- Italy
- Prior art keywords
- bit
- central hole
- conical surface
- drill bit
- cutting edges
- Prior art date
Links
Abstract
The drill bit for use in percussion drilling comprises a solid drill bit having one or more cutting edges at its front end and a centrally provided hole, and a rod having a forwardly tapering conical portion. The central hole in the bit has a matching conical internal surface for supporting the bit on the rod by engagement between the conical surfaces. The central hole is bottomed in the bit and comprises a cylindrical internal surface in front of the conical surface. The cylindrical surface having an internal thread matching an external thread on the foremost part of the od. The external thread on the rod being positioned axially in front of the internal thread and at a distance from the bottom of the bit hole when the bit is in operating position having its conical surface engaged with the conical surface of the rod.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT2220276A IT1059711B (en) | 1976-04-12 | 1976-04-12 | Percussion drill bit with one or more cutting edges - has bottomed central hole with conical surface to match rod taper portion |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT2220276A IT1059711B (en) | 1976-04-12 | 1976-04-12 | Percussion drill bit with one or more cutting edges - has bottomed central hole with conical surface to match rod taper portion |
Publications (1)
Publication Number | Publication Date |
---|---|
IT1059711B true IT1059711B (en) | 1982-06-21 |
Family
ID=11192978
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IT2220276A IT1059711B (en) | 1976-04-12 | 1976-04-12 | Percussion drill bit with one or more cutting edges - has bottomed central hole with conical surface to match rod taper portion |
Country Status (1)
Country | Link |
---|---|
IT (1) | IT1059711B (en) |
-
1976
- 1976-04-12 IT IT2220276A patent/IT1059711B/en active
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