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 portion

Info

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
Application number
IT2220276A
Other languages
Italian (it)
Original Assignee
Sandvik Ab
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sandvik Ab filed Critical Sandvik Ab
Priority to IT2220276A priority Critical patent/IT1059711B/en
Application granted granted Critical
Publication of IT1059711B publication Critical patent/IT1059711B/en

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.
IT2220276A 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 IT1059711B (en)

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)

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