Keilschmierung für Dth-Hämmer

Details

Veröffentlichungs-Nr.

EP3913184

Aktenzeichen

EP20175331

Anmeldetag

19. Mai 2020

Veröffentlichung

12. Juli 2023

Erteilung

12. Juli 2023

Rechtsraum

EP

IPC

E21B4/14E21B10/36

Abstract

A down the hole drilling assembly comprising: an elongate casing (15); a fluid powered piston (19) arranged moveably inside the casing (15) having a piston nose (24); a driver sub (34) provided with a set of axially extending driver sub splines (30) on its internal surface; a drill bit (14) comprising an elongate shank (29) provided with a set of axially extending shank splines (31) for engagement with the driver sub splines (29) to form a spline area (32); a guide sleeve (23) for forming a first seal (25) with the piston nose (24); wherein, the guide sleeve (23) forms a second seal with the outer surface of the shank (29) and there is at least one air passageway (55) extending through the guide sleeve (23) and / or the casing (15) for fluidly connecting the bottom chamber (22) to the spline area (32) to provide lubrication thereto.

Anmelder

Firmen

Sandvik Mining and Construction Tools AB
Sandvik Mining and Construction Oy

Land

🇸🇪 Schweden

Fachgebiete