EP 0771934 B1 20030423 - Coupling for percussion rods
Title (en)
Coupling for percussion rods
Title (de)
Bohrwerkzeug, insbesondere zur Bearbeitung von Gestein
Title (fr)
Accouplement pour tiges de forage à percussion
Publication
Application
Priority
DE 19541163 A 19951104
Abstract (en)
[origin: EP0771934A2] The drilling tool has parts which can be connected to one another using a thread (8,8'). The thread connection is in the form of a modified round thread. In order to avoid high wedge forces on the external thread of a threaded spigot (6) and/or on the internal thread of a threaded nut (7), threaded sections (14,15,15') are arranged with parallel axes on each shaft raised surface (11,11') and/or in each shaft depression (12,12'). The region (18,18') between the threaded sections is formed by a continuous curved groove.
IPC 1-7
IPC 8 full level
E21B 17/042 (2006.01)
CPC (source: EP)
E21B 17/0426 (2013.01)
Designated contracting state (EPC)
CH DE FR GB IT LI
DOCDB simple family (publication)
EP 0771934 A2 19970507; EP 0771934 A3 19980617; EP 0771934 B1 20030423; DE 19541163 A1 19970507; DE 59610370 D1 20030528
DOCDB simple family (application)
EP 96116533 A 19961016; DE 19541163 A 19951104; DE 59610370 T 19961016