Title:
【発明の名称】削岩機装置
Document Type and Number:
Japanese Patent JP3382641
Kind Code:
B2
Abstract:
Rock drilling device comprising a drilling tool with a set of tubes (7) and a set of rods (9) arranged therein. The drilling tool comprises a number of sections which each comprises a tube (7), a rod (9) and an end piece (11). The rod is provided with projections (10) at least near one of its ends for cooperation with parts (13,14) with reduced diameter in the tube and end piece respectively. The part (13) in the tube limits the movement of the rod in a direction away from the end piece. The part (14) in the end piece limits the movement of the rod in a direction towards the end piece. All thread connections (12) between different sections of the drilling tool and between tube and end piece within each section are made in the same way and thus equally easy to break.
Inventors:
Jergen Rodart
Kurt Anderson
Kurt Anderson
Application Number:
JP22840592A
Publication Date:
March 04, 2003
Filing Date:
August 27, 1992
Export Citation:
Assignee:
Unilock Activrag
International Classes:
E21B7/20; E21B17/00; E21B3/00; E21B17/042; (IPC1-7): E21B17/042; E21B3/00
Domestic Patent References:
| JP216287A | ||||
| JP5890290U |
Attorney, Agent or Firm:
Shigeru Yagita (4 outside)