Title:
METHOD OF TAKING OUT CORE AND PUSHING-IN DEVICE USED THEREFOR
Document Type and Number:
Japanese Patent JP3785340
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To integrally take the whole body of a core including its front end in an inner tube by releasing the core from a state where the front end of the core is pinched by means of a core lifter.
SOLUTION: The core 10 is made to enter into the inner tube 7 during the boring operation by means of a core collecting device 100 which nonrotatably holds the inner tube 7 while an outer tube 3 is rotated and pulled up to the ground surface by means of the core lifter 9 housed in a core lifter case 8 provided at the front end of the inner tube 7 while the lifter 9 prevents the falling of the core 10 by pinching the front end section of the core 10. After the core 10 is pulled up, the front end section of the core 10 is released from the pinched state by pushing the core 10 into the interior of the inner tube 7 deeper than the core lifter 9 along the axial line of the tube 7 by means of a pushing-in device 101.
More Like This:
Inventors:
Komiya Kunimori
Application Number:
JP2001250443A
Publication Date:
June 14, 2006
Filing Date:
August 21, 2001
Export Citation:
Assignee:
Hi-Tech Co., Ltd.
International Classes:
E21B25/02; E02D1/04; (IPC1-7): E21B25/02; E02D1/04
Domestic Patent References:
| JP11173054A |
Attorney, Agent or Firm:
Nobumichi Miyata