Title:
KELLY-BAR GUIDE DEVICE FOR EARTH DRILL
Document Type and Number:
Japanese Patent JP2000145347
Kind Code:
A
Abstract:
To provide a guide device for preventing the bending of kelly-bar of earth drill, which has a simple construction and is low in cost.
A reel table is attached to the lower part of a kelley drive device 5 through a center joint 9. A joint pipe 6 is provided in order to rotate the inner housing 7 of the center joint 9 together with a shaft 32 of a kelly drive device 5 as one united body. A liner 52 is provided inside a joint pipe 6 for preventing the deflection of the kelly bar 21.
Inventors:
KIUE AKIO
Application Number:
JP31561298A
Publication Date:
May 26, 2000
Filing Date:
November 06, 1998
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACHINERY
International Classes:
E21B3/06; E21B11/00; (IPC1-7): E21B11/00; E21B3/06
Attorney, Agent or Firm:
Shoichi Wakata
Previous Patent: BIT STRUCTURE FOR AUGER
Next Patent: DETECTION DEVICE FOR DEPOSITED SAND LAYER LEVEL IN DEEP WELL
Next Patent: DETECTION DEVICE FOR DEPOSITED SAND LAYER LEVEL IN DEEP WELL