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Patent Searching and Data


Title:
DEVICE FOR COLLECTING CORE WITH KNOWN BEARING AND METHOD THEREFOR
Document Type and Number:
Japanese Patent JP2012012918
Kind Code:
A
Abstract:

To solve the problem that, when it is intended to collect a core with a known bearing during a soil investigation boring, a twist in a non-rotary rod as accumulation of machining errors in members and co-rotation with a rotating boring rod results in an error in the bearing of the collected core.

A double-pipe device is configured of: a rotating outer pipe ; and an inner pipe which is placed coaxially and in a free-rotating position inside the outer pipe. The inner pipe has a continuous rotation-producing system that converts the axial-flow fluid motion of a fluid passing inside the outer pipe or the inner pipe to a rotary motion in an reverse rotation to the rotary direction of the outer pipe, so that a twist in the inner pipe due to machining errors in members and co-rotation with the rotating outer pipe can be reduced.


Inventors:
MURATA SEIICHI
Application Number:
JP2010000165331
Publication Date:
January 19, 2012
Filing Date:
July 05, 2010
Export Citation:
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Assignee:
KOCHI CHISHITSU CHOSA CO LTD
International Classes:
E02D1/04