Title:
EARTH DRILL MACHINE
Document Type and Number:
Japanese Patent JP3466380
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To conduct auxiliary suspension works smoothly after excavation works, and to bear thrust-up force at the time of excavation and perform accurate excavation.
SOLUTION: In this earth drill machine, a kelly bar 3 is lowered while being rotated and driven by a kelly-bar rotating driving device 5, and a pit is excavated by an excavation bucket 4. A front frame 6 for loading the kelly-bar rotating driving device 5 is pivoted rotatably to the lower section of a boom 2 while a derricking cylinder 7 for bearing and derricking the front frame 6 is supported pivotally to a self-propelled car body 1, and the upper side of the derricking cylinder 7 is journalled rotatably to the front frame 6 through a slidable slider 21 capable of locking the stop of the sliding of the slider 21 at that time.
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Inventors:
Hidekazu Ajiro
Application Number:
JP12581796A
Publication Date:
November 10, 2003
Filing Date:
May 21, 1996
Export Citation:
Assignee:
Hitachi Construction Machinery Co., Ltd.
International Classes:
E21B3/02; E21B7/02; (IPC1-7): E21B7/02; E21B3/02
Domestic Patent References:
| JP6223904Y1 | ||||
| JP447276Y2 |
Attorney, Agent or Firm:
Kenjiro Take (1 person outside)
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