Title:
穴あけ工具に用いられる装置
Document Type and Number:
Japanese Patent JP4708419
Kind Code:
B2
Abstract:
An apparatus for a drilling tool includes a pilot drilling bit, a reamer, and a pilot body which is disposed to support the reamer and the pilot drilling bit at the end of a casing tube. The reamer includes a closed position in which the parts of the tool are concentric with one another and displaceable through the casing tube, and an open position in which at least a part of the reamer is located radially outside the casing tube. The pilot body includes a male portion which extends through the reamer, the male portion of the pilot body forming a cam surface for transferring rotation energy to the reamer and for switching the reamer between the closed and open positions, and the male portion of the pilot body being insertable in a recess in the pilot drilling bit.
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| JP6751643 | Drilling tool |
Inventors:
OVE GOTING
Application Number:
JP2007507276A
Publication Date:
June 22, 2011
Filing Date:
April 06, 2005
Export Citation:
Assignee:
OVE GOTING
International Classes:
E21B10/26; E21B7/20; E21B10/40; E21B10/66; E21B
Domestic Patent References:
| JP8004465A | ||||
| JP1280195A | ||||
| JP59004789A |
Attorney, Agent or Firm:
Hirohito Katsunuma
Hiroyuki Nagai
Katsuomi Isogai
Satoshi Nazuka
Junpei Okada
Hideyuki Mori
Yukihiro Hotta
Hiroki Kashima
Hiroyuki Nagai
Katsuomi Isogai
Satoshi Nazuka
Junpei Okada
Hideyuki Mori
Yukihiro Hotta
Hiroki Kashima