Elliptisches Design für Aussengewindeabstand

Details

Veröffentlichungs-Nr.

EP3879065

Aktenzeichen

EP20162266

Anmeldetag

11. März 2020

Veröffentlichung

16. November 2022

Erteilung

16. November 2022

Rechtsraum

EP

IPC

E21B17/00E21B17/042

Abstract

A drill string rod comprising:an elongate hollow main length section (101);a male spigot portion (108) provided at the second end (106) having an externally threaded section (107) and a non-threaded shank (109) positioned axially intermediate the main length section (101) and the threaded section (107);the shank (109) having a transition section (206) positioned adjacent the main length section (101) or a radially projecting shoulder (110) at the second end (106), the transition section (206);wherein the cross-sectional shape profile of the outer surface of the transition section (206) in the plane of the longitudinal axis (204) comprises a segment of an ellipse having semi-major axis (a); a semi-minor axis (b) wherein the ratio of the semi-major to semi-minor axes (a:b) is within the range 2b<a<8b.

Anmelder

Firma

Sandvik Mining and Construction Tools AB

Land

🇸🇪 Schweden

Fachgebiete