JPS622112B2 - - Google Patents

Info

Publication number
JPS622112B2
JPS622112B2 JP18500480A JP18500480A JPS622112B2 JP S622112 B2 JPS622112 B2 JP S622112B2 JP 18500480 A JP18500480 A JP 18500480A JP 18500480 A JP18500480 A JP 18500480A JP S622112 B2 JPS622112 B2 JP S622112B2
Authority
JP
Japan
Prior art keywords
excavation
bit
tool
load
control device
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
JP18500480A
Other languages
English (en)
Japanese (ja)
Other versions
JPS57112591A (en
Inventor
Hiroshi Kusumi
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 JP18500480A priority Critical patent/JPS57112591A/ja
Publication of JPS57112591A publication Critical patent/JPS57112591A/ja
Publication of JPS622112B2 publication Critical patent/JPS622112B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Earth Drilling (AREA)
JP18500480A 1980-12-27 1980-12-27 Automatic fall controller for excavating device of vertical hole excavator Granted JPS57112591A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18500480A JPS57112591A (en) 1980-12-27 1980-12-27 Automatic fall controller for excavating device of vertical hole excavator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18500480A JPS57112591A (en) 1980-12-27 1980-12-27 Automatic fall controller for excavating device of vertical hole excavator

Publications (2)

Publication Number Publication Date
JPS57112591A JPS57112591A (en) 1982-07-13
JPS622112B2 true JPS622112B2 (enrdf_load_stackoverflow) 1987-01-17

Family

ID=16163087

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18500480A Granted JPS57112591A (en) 1980-12-27 1980-12-27 Automatic fall controller for excavating device of vertical hole excavator

Country Status (1)

Country Link
JP (1) JPS57112591A (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
JPS57112591A (en) 1982-07-13

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