JPS6315422Y2 - - Google Patents

Info

Publication number
JPS6315422Y2
JPS6315422Y2 JP784383U JP784383U JPS6315422Y2 JP S6315422 Y2 JPS6315422 Y2 JP S6315422Y2 JP 784383 U JP784383 U JP 784383U JP 784383 U JP784383 U JP 784383U JP S6315422 Y2 JPS6315422 Y2 JP S6315422Y2
Authority
JP
Japan
Prior art keywords
oil
hydraulic
check valve
bit
expansion
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
Application number
JP784383U
Other languages
English (en)
Japanese (ja)
Other versions
JPS59116489U (ja
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 filed Critical
Priority to JP784383U priority Critical patent/JPS59116489U/ja
Publication of JPS59116489U publication Critical patent/JPS59116489U/ja
Application granted granted Critical
Publication of JPS6315422Y2 publication Critical patent/JPS6315422Y2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Earth Drilling (AREA)
JP784383U 1983-01-25 1983-01-25 油圧拡大掘削装置における拡大ビツト等の作動装置 Granted JPS59116489U (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP784383U JPS59116489U (ja) 1983-01-25 1983-01-25 油圧拡大掘削装置における拡大ビツト等の作動装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP784383U JPS59116489U (ja) 1983-01-25 1983-01-25 油圧拡大掘削装置における拡大ビツト等の作動装置

Publications (2)

Publication Number Publication Date
JPS59116489U JPS59116489U (ja) 1984-08-06
JPS6315422Y2 true JPS6315422Y2 (enrdf_load_stackoverflow) 1988-04-28

Family

ID=30139357

Family Applications (1)

Application Number Title Priority Date Filing Date
JP784383U Granted JPS59116489U (ja) 1983-01-25 1983-01-25 油圧拡大掘削装置における拡大ビツト等の作動装置

Country Status (1)

Country Link
JP (1) JPS59116489U (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4638717B2 (ja) * 2004-11-19 2011-02-23 三和機材株式会社 掘削作業ロッドの流体圧式作業具駆動装置における作業具最大進出確認装置

Also Published As

Publication number Publication date
JPS59116489U (ja) 1984-08-06

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