Title:
DRILLING METHOD
Document Type and Number:
Japanese Patent JP3464947
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To efficiently drill by facilitating operability, and to provide a drilling pressure regardless of a work radius of a derricking boom.
SOLUTION: At a tip part of a telescopic boom 3b of the derricking boom 3, an auger screw 5 is run by a rotary drive unit 4 installed to be oscillated and displaced to constantly keep verticality to the ground regardless of derricking action of the derricking boom 3 while it is unrotatable around a vertical axis center, and a drawing cable device 6 is provided between the tip part of the telescopic boom 3b and a vehicle 1, so the auger screw 5 is run by drawing operation by the drawing cable device 6 and falling and derricking and contraction operation of the derricking boom 3.
Inventors:
Kawahara Ayao
Application Number:
JP23888099A
Publication Date:
November 10, 2003
Filing Date:
August 25, 1999
Export Citation:
Assignee:
Kawahara Ayao
International Classes:
E21B7/00; E21B7/02; (IPC1-7): E21B7/00
Domestic Patent References:
| JP55142826A | ||||
| JP6236088B1 | ||||
| JP5751785Y1 |
Attorney, Agent or Firm:
Tadashi Fujikawa
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