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Patent Searching and Data


Title:
DEVICE FOR COLLECTING CORE WITH KNOWN DIRECTION AND METHOD THEREFOR
Document Type and Number:
Japanese Patent JP2012012928
Kind Code:
A
Abstract:

To eliminate a displacement in the direction of a collected core, which is caused by a twist in an inner pipe due to co-rotation with an rotating outer pipe, when it is intended to collect a core with a known direction by use of a double-pipe system.

A double-pipe system is configured of: a rotary outer pipe 12; and an inner pipe which is placed coaxially and at a free-rotation state inside the rotary outer pipe. The inner pipe is a member whose center of gravity is eccentric with respect to the axis, so that the inner pipe, when the double-pipe is in a horizontal or a slightly slant position, maintains a vertically consistent posture under the effect of a gravitational downward force working on it.


Inventors:
MURATA SEIICHI
Application Number:
JP2011000136756
Publication Date:
January 19, 2012
Filing Date:
June 01, 2011
Export Citation:
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Assignee:
KOCHI CHISHITSU CHOSA CO LTD
International Classes:
E21B25/16; E21B49/02; G01N1/08