JPS63877Y2 - - Google Patents
Info
- Publication number
- JPS63877Y2 JPS63877Y2 JP1271679U JP1271679U JPS63877Y2 JP S63877 Y2 JPS63877 Y2 JP S63877Y2 JP 1271679 U JP1271679 U JP 1271679U JP 1271679 U JP1271679 U JP 1271679U JP S63877 Y2 JPS63877 Y2 JP S63877Y2
- Authority
- JP
- Japan
- Prior art keywords
- chip
- tip
- pieces
- shank
- drilling bit
- 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
- 238000005553 drilling Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 7
- 238000009412 basement excavation Methods 0.000 description 12
- 238000005219 brazing Methods 0.000 description 5
- 238000005520 cutting process Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 229910000679 solder Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 239000007779 soft material Substances 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000003491 array Methods 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1271679U JPS63877Y2 (enEXAMPLES) | 1979-02-02 | 1979-02-02 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1271679U JPS63877Y2 (enEXAMPLES) | 1979-02-02 | 1979-02-02 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55113791U JPS55113791U (enEXAMPLES) | 1980-08-11 |
| JPS63877Y2 true JPS63877Y2 (enEXAMPLES) | 1988-01-11 |
Family
ID=28829485
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1271679U Expired JPS63877Y2 (enEXAMPLES) | 1979-02-02 | 1979-02-02 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63877Y2 (enEXAMPLES) |
-
1979
- 1979-02-02 JP JP1271679U patent/JPS63877Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55113791U (enEXAMPLES) | 1980-08-11 |
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