JPS60115792A - 掘削ビット - Google Patents

掘削ビット

Info

Publication number
JPS60115792A
JPS60115792A JP22223683A JP22223683A JPS60115792A JP S60115792 A JPS60115792 A JP S60115792A JP 22223683 A JP22223683 A JP 22223683A JP 22223683 A JP22223683 A JP 22223683A JP S60115792 A JPS60115792 A JP S60115792A
Authority
JP
Japan
Prior art keywords
blade
excavation
rotation
reverse rotation
enlarged
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
JP22223683A
Other languages
English (en)
Japanese (ja)
Other versions
JPH0379518B2 (enrdf_load_stackoverflow
Inventor
智之 早川
梁島　郁夫
茂 吉田
宍戸　富雄
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
Nippon Concrete Industries Co Ltd
Asahi Chemical Industry Co Ltd
Original Assignee
Nippon Concrete Industries Co Ltd
Asahi Chemical Industry Co Ltd
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 Nippon Concrete Industries Co Ltd, Asahi Chemical Industry Co Ltd, Asahi Kasei Kogyo KK filed Critical Nippon Concrete Industries Co Ltd
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 true JPS60115792A (ja) 1985-06-22
JPH0379518B2 JPH0379518B2 (enrdf_load_stackoverflow) 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 (enrdf_load_stackoverflow)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4969903U (enrdf_load_stackoverflow) * 1972-10-02 1974-06-18
JPS5149123A (ja) * 1974-10-28 1976-04-28 Hitachi Metals Ltd Funryutaireikyakusochi
JPS5314481U (enrdf_load_stackoverflow) * 1976-07-20 1978-02-06
JPS57193783U (enrdf_load_stackoverflow) * 1981-06-04 1982-12-08

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4969903U (enrdf_load_stackoverflow) * 1972-10-02 1974-06-18
JPS5149123A (ja) * 1974-10-28 1976-04-28 Hitachi Metals Ltd Funryutaireikyakusochi
JPS5314481U (enrdf_load_stackoverflow) * 1976-07-20 1978-02-06
JPS57193783U (enrdf_load_stackoverflow) * 1981-06-04 1982-12-08

Also Published As

Publication number Publication date
JPH0379518B2 (enrdf_load_stackoverflow) 1991-12-19

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