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Patent Searching and Data


Title:
GUIDE BORING TECHNIQUE AND DRILLING DEVICE USED THEREFOR
Document Type and Number:
Japanese Patent JP3790566
Kind Code:
B2
Abstract:

PROBLEM TO BE SOLVED: To drill an large hole at a high speed in a good rectileanear manner.
SOLUTION: A pilot hole (d) is drilled from a start vertical hole B to an arrival vertical hole C with a pilot hole bit or a non-core bit. Then, a pilot bit 51 as a large bit 50 is inserted from the start vertical hole B into the pilot hole (d) to be used as a guide, so that a large hole can be drilled by the rotation, blow and propulsion of a reaming bit 57 connected backward. The rotating and blowing force is granted from a rotary percussion 21.


Inventors:
Hayashi, Takeshi
Saburi, Akihiro
Tsuruta, Michio
Koga, Shigeyuki
Application Number:
JP1995000180435
Publication Date:
June 28, 2006
Filing Date:
July 17, 1995
Export Citation:
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Assignee:
MITSUBISHI MATERIALS CORP
NISHISUI:KK
Y B M HANBAI KK
International Classes:
E21B7/04; (IPC1-7): E21B7/04
Domestic Patent References:
JP7158368A
JP4083083A
JP3026278B2
JP62114986U
JP2042792Y2
JP533589A
JP3119288A
Attorney, Agent or Firm:
志賀 正武
渡邊 隆
成瀬 重雄