Keilausrichtung für Dth-Hammeranordnung

Details

Veröffentlichungs-Nr.

EP4667703

Aktenzeichen

EP24182804

Anmeldetag

18. Juni 2024

Veröffentlichung

24. Dezember 2025

Rechtsraum

EP

IPC

E21B4/14E21B10/36E21B17/07

Abstract

A hammer drill assembly (2) for coupling to a drill string having a drill bit (12) positioned at the forward end (8) having a drill head (16) and a bit shaft (14); wherein a plurality of axially extending bit splines (28) project radially outwards from a radially outward facing surface of the bit shaft; wherein each of the bit splines comprises a bit spline tip (30) at its axially rearward end having a rearward axially outer edge (48) and a central bit spline longitudinal axis (32); and a driver sub (26) provided axially rearward of the drill bit comprising a plurality of axially extending driver sub splines (34) projecting radially inwards from an inward facing surface of the driver sub; characterised in that: the rearward axially outer edge on at least of one of bit spline tips is non-perpendicular to the bit spline longitudinal axis along at least 25% of the width of the bit spline tip.

Anmelder

Firma

Sandvik Mining and Construction Oy

Land

🇫🇮 Finnland

Fachgebiete