JPS53147601A - Device of varying diameter of bit for total section raise excavation - Google Patents
Device of varying diameter of bit for total section raise excavationInfo
- Publication number
- JPS53147601A JPS53147601A JP6364377A JP6364377A JPS53147601A JP S53147601 A JPS53147601 A JP S53147601A JP 6364377 A JP6364377 A JP 6364377A JP 6364377 A JP6364377 A JP 6364377A JP S53147601 A JPS53147601 A JP S53147601A
- Authority
- JP
- Japan
- Prior art keywords
- bit
- varying diameter
- total section
- section raise
- excavation
- 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.)
- Granted
Links
Landscapes
- Earth Drilling (AREA)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6364377A JPS53147601A (en) | 1977-05-31 | 1977-05-31 | Device of varying diameter of bit for total section raise excavation |
DE2815149A DE2815149C3 (en) | 1977-04-28 | 1978-04-07 | Method and device for breaking up a shaft by drilling upwards from a solid |
US06/895,103 US4248312A (en) | 1977-04-28 | 1978-04-10 | Method and apparatus for upwardly cutting full cutting face of a shaft without requesting workmen's hands |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6364377A JPS53147601A (en) | 1977-05-31 | 1977-05-31 | Device of varying diameter of bit for total section raise excavation |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS53147601A true JPS53147601A (en) | 1978-12-22 |
JPS577280B2 JPS577280B2 (en) | 1982-02-09 |
Family
ID=13235231
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6364377A Granted JPS53147601A (en) | 1977-04-28 | 1977-05-31 | Device of varying diameter of bit for total section raise excavation |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS53147601A (en) |
-
1977
- 1977-05-31 JP JP6364377A patent/JPS53147601A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS577280B2 (en) | 1982-02-09 |
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