JPS6073993A - 竪孔掘削機のケリ−バ落下衡撃吸収装置 - Google Patents

竪孔掘削機のケリ−バ落下衡撃吸収装置

Info

Publication number
JPS6073993A
JPS6073993A JP18069183A JP18069183A JPS6073993A JP S6073993 A JPS6073993 A JP S6073993A JP 18069183 A JP18069183 A JP 18069183A JP 18069183 A JP18069183 A JP 18069183A JP S6073993 A JPS6073993 A JP S6073993A
Authority
JP
Japan
Prior art keywords
kelly bar
bar
kelly
drive device
hole
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
Application number
JP18069183A
Other languages
English (en)
Japanese (ja)
Other versions
JPS635552B2 (en]
Inventor
久住　宏
平野　信孝
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Construction Machinery Co Ltd
Original Assignee
Hitachi Construction Machinery Co Ltd
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 Hitachi Construction Machinery Co Ltd filed Critical Hitachi Construction Machinery Co Ltd
Priority to JP18069183A priority Critical patent/JPS6073993A/ja
Publication of JPS6073993A publication Critical patent/JPS6073993A/ja
Publication of JPS635552B2 publication Critical patent/JPS635552B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Earth Drilling (AREA)
JP18069183A 1983-09-30 1983-09-30 竪孔掘削機のケリ−バ落下衡撃吸収装置 Granted JPS6073993A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18069183A JPS6073993A (ja) 1983-09-30 1983-09-30 竪孔掘削機のケリ−バ落下衡撃吸収装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18069183A JPS6073993A (ja) 1983-09-30 1983-09-30 竪孔掘削機のケリ−バ落下衡撃吸収装置

Publications (2)

Publication Number Publication Date
JPS6073993A true JPS6073993A (ja) 1985-04-26
JPS635552B2 JPS635552B2 (en]) 1988-02-04

Family

ID=16087617

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18069183A Granted JPS6073993A (ja) 1983-09-30 1983-09-30 竪孔掘削機のケリ−バ落下衡撃吸収装置

Country Status (1)

Country Link
JP (1) JPS6073993A (en])

Also Published As

Publication number Publication date
JPS635552B2 (en]) 1988-02-04

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