JPH0379518B2 - - Google Patents

Info

Publication number
JPH0379518B2
JPH0379518B2 JP58222236A JP22223683A JPH0379518B2 JP H0379518 B2 JPH0379518 B2 JP H0379518B2 JP 58222236 A JP58222236 A JP 58222236A JP 22223683 A JP22223683 A JP 22223683A JP H0379518 B2 JPH0379518 B2 JP H0379518B2
Authority
JP
Japan
Prior art keywords
enlarged
excavation
bit
digging
diameter
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 - Lifetime
Application number
JP58222236A
Other languages
English (en)
Japanese (ja)
Other versions
JPS60115792A (ja
Inventor
Tomoyuki Hayakawa
Ikuo Yanajima
Shigeru Yoshida
Tomio Shishido
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.)
Asahi Kasei Corp
Original Assignee
Asahi Kasei Kogyo KK
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 Asahi Kasei Kogyo KK filed Critical Asahi Kasei Kogyo KK
Priority to JP22223683A priority Critical patent/JPS60115792A/ja
Publication of JPS60115792A publication Critical patent/JPS60115792A/ja
Publication of JPH0379518B2 publication Critical patent/JPH0379518B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Earth Drilling (AREA)
JP22223683A 1983-11-28 1983-11-28 掘削ビット Granted JPS60115792A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP22223683A JPS60115792A (ja) 1983-11-28 1983-11-28 掘削ビット

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22223683A JPS60115792A (ja) 1983-11-28 1983-11-28 掘削ビット

Publications (2)

Publication Number Publication Date
JPS60115792A JPS60115792A (ja) 1985-06-22
JPH0379518B2 true JPH0379518B2 (pt) 1991-12-19

Family

ID=16779240

Family Applications (1)

Application Number Title Priority Date Filing Date
JP22223683A Granted JPS60115792A (ja) 1983-11-28 1983-11-28 掘削ビット

Country Status (1)

Country Link
JP (1) JPS60115792A (pt)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5149123A (ja) * 1974-10-28 1976-04-28 Hitachi Metals Ltd Funryutaireikyakusochi
JPS5314481U (pt) * 1976-07-20 1978-02-06

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4969903U (pt) * 1972-10-02 1974-06-18
JPS6141833Y2 (pt) * 1981-06-04 1986-11-27

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5149123A (ja) * 1974-10-28 1976-04-28 Hitachi Metals Ltd Funryutaireikyakusochi
JPS5314481U (pt) * 1976-07-20 1978-02-06

Also Published As

Publication number Publication date
JPS60115792A (ja) 1985-06-22

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