Title:
IMPROVED DOUBLE-CORE TUBE SAMPLER
Document Type and Number:
Japanese Patent JP2005113383
Kind Code:
A
Abstract:
To provide an improved double-core tube sampler which enables efficient coring.
In this double-core tube sampler, a drain hole (12c) for discharging water, supplied in excavation, to the outside is provided in a side wall slightly above the tip of a bit (12); the tip of the bit has such a stepped shape that an inner peripheral part (12a) is elongated in the direction of the tip with respect to an outer peripheral part (12b); and the inner peripheral part is formed of a dry diamond. Preferably, a reamer (12d) serving as a diameter-enlarged part is provided in a part below the weep hole of the side wall of the bit.
Inventors:
HOSONO TAKAYUKI
KOBAYASHI MASAHIRO
NAGAOKA DAISUKE
KOBAYASHI MASAHIRO
NAGAOKA DAISUKE
Application Number:
JP2003345214A
Publication Date:
April 28, 2005
Filing Date:
October 03, 2003
Export Citation:
Assignee:
HOSONO TAKAYUKI
KOBAYASHI MASAHIRO
NAGAOKA DAISUKE
KOBAYASHI MASAHIRO
NAGAOKA DAISUKE
International Classes:
E21B25/00; E02D1/04; E21B25/10; (IPC1-7): E21B25/00; E02D1/04; E21B25/10
Attorney, Agent or Firm:
Seiji Sugiyama