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Patent Searching and Data


Title:
METHOD AND DEVICE FOR SAMPLING, GROUND SAMPLING BIT, AND CORE LIFTER CASE
Document Type and Number:
Japanese Patent JP2000291370
Kind Code:
A
Abstract:

To provide a device and a method for sampling, a ground sampling bit, and a core lifter case capable of sampling easily and surely even on grounds high in collapsibility such as those where much water wells up.

The tip part of a bit 1 comprises a portion for cutting a ground and a first inwardly open taper 12 formed on the inner peripheral surface thereof. The tip part of a core lifter case 2 comprises a second convergent taper 22 forming a tapered clearance between that tip part and the first taper 12. The angles of the tapers 12 and 22 are 70 deg. relative to the cross-section of a sampling device, respectively. Though this angle is best at 70 deg., an angle of 60 deg. or more to 80 deg. or less may be selected, and an angle of 65 deg. or more to less than 75 deg. is specially desirable. The tip part of the core lifter case 2 is provided at a position shorter 5 mm from the tip of the bit 1.


Inventors:
TSUKADA MOTOHARU
Application Number:
JP1999000104270
Publication Date:
October 17, 2000
Filing Date:
April 12, 1999
Export Citation:
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Assignee:
NIPPON KISO GIJUTSU KK
International Classes:
E21B25/10; (IPC1-7): E21B25/10
Attorney, Agent or Firm:
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