EP 1382794 A1 20040121 - STEP TUBE ROD, AND DRILLING MACHINE
Title (en)
STEP TUBE ROD, AND DRILLING MACHINE
Title (de)
ABGESTUFTES ROHR UND BOHRMASCHINE
Title (fr)
TIGE TUBULAIRE A ETAGES ET MACHINE DE FORAGE
Publication
Application
Priority
- JP 0204149 W 20020425
- JP 2001130084 A 20010426
- JP 2001130085 A 20010426
Abstract (en)
In the present invention, in a drill rod for a boring machine, a rod outside diameter is large so as to be approximately equal to a bore diameter, external threads are provided at one end and internal threads are provided at the other end, and at least one small-diameter portion is formed near an internally threaded portion. This step tube rod can reduce a bore bend. <??>Also, for the boring machine using this step tube rod, the drill rod can be positioned easily, so that the connection and recovery work can be performed efficiently and safely. <IMAGE>
IPC 1-7
IPC 8 full level
E21B 17/042 (2006.01); E21B 19/24 (2006.01)
CPC (source: EP KR US)
E21B 17/00 (2013.01 - KR); E21B 17/0426 (2013.01 - EP US); E21B 19/24 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR
DOCDB simple family (publication)
US 2003132035 A1 20030717; CA 2411253 A1 20021028; CN 1460145 A 20031203; EP 1382794 A1 20040121; EP 1382794 A4 20050720; JP WO2002088511 A1 20040819; KR 20040002377 A 20040107; WO 02088511 A1 20021107
DOCDB simple family (application)
US 27676302 A 20021119; CA 2411253 A 20020425; CN 02800916 A 20020425; EP 02720600 A 20020425; JP 0204149 W 20020425; JP 2002585777 A 20020425; KR 20027014169 A 20021022