JPS644949Y2 - - Google Patents
Info
- Publication number
- JPS644949Y2 JPS644949Y2 JP1983182082U JP18208283U JPS644949Y2 JP S644949 Y2 JPS644949 Y2 JP S644949Y2 JP 1983182082 U JP1983182082 U JP 1983182082U JP 18208283 U JP18208283 U JP 18208283U JP S644949 Y2 JPS644949 Y2 JP S644949Y2
- Authority
- JP
- Japan
- Prior art keywords
- bit
- excavation
- claw
- expanding
- wings
- 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
- 238000009412 basement excavation Methods 0.000 claims description 29
- 210000000078 claw Anatomy 0.000 claims description 25
- 238000005553 drilling Methods 0.000 claims description 13
- 230000002441 reversible effect Effects 0.000 description 5
- 239000012530 fluid Substances 0.000 description 4
- 238000007599 discharging Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Landscapes
- Earth Drilling (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18208283U JPS6091691U (ja) | 1983-11-28 | 1983-11-28 | 掘削ビツト |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18208283U JPS6091691U (ja) | 1983-11-28 | 1983-11-28 | 掘削ビツト |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6091691U JPS6091691U (ja) | 1985-06-22 |
| JPS644949Y2 true JPS644949Y2 (US08063081-20111122-C00044.png) | 1989-02-08 |
Family
ID=30394409
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18208283U Granted JPS6091691U (ja) | 1983-11-28 | 1983-11-28 | 掘削ビツト |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6091691U (US08063081-20111122-C00044.png) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4728164U (US08063081-20111122-C00044.png) * | 1971-04-12 | 1972-11-30 |
-
1983
- 1983-11-28 JP JP18208283U patent/JPS6091691U/ja active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4728164U (US08063081-20111122-C00044.png) * | 1971-04-12 | 1972-11-30 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6091691U (ja) | 1985-06-22 |
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