EP 0771388 A1 19970507 - THREAD COUPLING
Title (en)
THREAD COUPLING
Title (de)
SCHRAUBVERBINDUNG
Title (fr)
RACCORD FILETE
Publication
Application
Priority
- SE 9500852 W 19950713
- SE 9402517 A 19940719
Abstract (en)
[origin: WO9602729A1] Thread coupling for percussive drilling including at least one male thread (10), arranged on a spigot (11), and one female thread (17), arranged within a sleeve. The threads are cylindrical and include an external stop surface (20) at a free end of the sleeve, and a contact surface (14) on the spigot. Further, they include an internal stop surface (21) in the sleeve, and an end surface (16) on the free end of the spigot. Initially, there is a play ( delta ) between the end surface (16) of the spigot and the internal stop surface (21) of the sleeve, this initial play being eliminated after wearing-in of the thread coupling. By increasing the pitch angle ( alpha ) of the threads (19, 17), a less tightening coupling is achieved, that due to the shoulder-bottom stop, still has an acceptable length of life.
IPC 1-7
IPC 8 full level
E21B 17/042 (2006.01); F16L 15/02 (2006.01)
CPC (source: EP)
E21B 17/0426 (2013.01)
Citation (search report)
See references of WO 9602729A1
Designated contracting state (EPC)
AT DE FR GB IE SE
DOCDB simple family (publication)
WO 9602729 A1 19960201; AU 3089395 A 19960216; AU 684380 B2 19971211; BR 9508260 A 19971223; CA 2192204 A1 19960201; EP 0771388 A1 19970507; FI 970181 A0 19970116; FI 970181 A 19970116; JP H10504077 A 19980414; SE 505073 C2 19970623; SE 9402517 D0 19940719; SE 9402517 L 19960120
DOCDB simple family (application)
SE 9500852 W 19950713; AU 3089395 A 19950713; BR 9508260 A 19950713; CA 2192204 A 19950713; EP 95926562 A 19950713; FI 970181 A 19970116; JP 50495096 A 19950713; SE 9402517 A 19940719