CORE BARREL FOR EXTRACTING ROCK-CORE, DRILL ROD AND SWIVEL JOINT

Title:

CORE BARREL FOR EXTRACTING ROCK-CORE, DRILL ROD AND SWIVEL JOINT

Document Type and Number:

Japanese Patent JP3971015

Kind Code:

B2

Abstract:

PROBLEM TO BE SOLVED: To provide a rock-core extracting core barrel not to roughen an excavated hole wall by the flow of a sludge.
SOLUTION: A second outer tube assembly 12 is unitedly provided through water passing gaps 23, 25 inside a first outer tube assembly 11 to axially move as it rotates. An inner tube assembluy 13 is slidably fitted inside the second outer tube assembly 12 through water passing gaps 24, 26. The inner tube assembly 13 is engaged with or disengaged from the second outer tube assembly 12 by a latch device 14.

Inventors:

Masaki Kawahara
Yasuo Kitani

Application Number:

JP5667098A

Publication Date:

September 05, 2007

Filing Date:

March 09, 1998

Export Citation:

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Assignee:

NLC Inc.
Geo Engineering Co., Ltd.

International Classes:

E21B25/00; E21B17/00; E21B17/05; (IPC1-7): E21B25/00; E21B17/00; E21B17/05

Domestic Patent References:

JP9242459A
JP7011860A
JP53006081B1
JP9256767A
JP6031722A
JP5033340A
JP1036893A

Attorney, Agent or Firm:

樺澤襄
Shimamune Masami
Satoshi Kabazawa

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