EP 0220147 A2 19870429 - Thread coupling for percussion drilling.
Title (en)
Thread coupling for percussion drilling.
Title (de)
Schraubverbindung zum Schlagbohren.
Title (fr)
Accouplement fileté pour forage à percussion.
Publication
Application
Priority
SE 8504842 A 19851017
Abstract (en)
A thread coupling for drill rods for percussion rock drilling comprising a male thread (15) and a co-operating female thread (12). The threads (12, 15) are designed internally in such a way that an essentially unchanged contact surface is maintained between the contact shoulders (16) of the threads adjacent to the thread clearance of the female thread (12) or the thread outlet of the male thread (15).
IPC 1-7
IPC 8 full level
E21B 17/042 (2006.01)
CPC (source: EP)
E21B 17/0426 (2013.01)
Designated contracting state (EPC)
AT DE FR GB SE
DOCDB simple family (publication)
EP 0220147 A2 19870429; EP 0220147 A3 19881117; AU 6367286 A 19870430; BR 8605070 A 19870721; CN 86107149 A 19870520; FI 864185 A0 19861016; FI 864185 A 19870418; JP S62125192 A 19870606; SE 8504842 D0 19851017; SE 8504842 L 19870418; ZA 867682 B 19870527
DOCDB simple family (application)
EP 86850341 A 19861008; AU 6367286 A 19861008; BR 8605070 A 19861016; CN 86107149 A 19861016; FI 864185 A 19861016; JP 24429486 A 19861016; SE 8504842 A 19851017; ZA 867682 A 19861008