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1. (WO2018158503) A DRILL BIT FOR PERCUSSIVE DRILLING, A DRILL BIT ASSEMBLY, AND A METHOD FOR MANUFACTURING SUCH A DRILL BIT

Pub. No.:    WO/2018/158503    International Application No.:    PCT/FI2018/050147
Publication Date: Sat Sep 08 01:59:59 CEST 2018 International Filing Date: Thu Mar 01 00:59:59 CET 2018
IPC: E21B 10/38
Applicants: ROBIT OYJ
Inventors: KORTE, Pasi
LEINO, Antti
Title: A DRILL BIT FOR PERCUSSIVE DRILLING, A DRILL BIT ASSEMBLY, AND A METHOD FOR MANUFACTURING SUCH A DRILL BIT
Abstract:
A drill bit (1) is provided, comprising a head portion (2) having a circumference (2a) and a face surface (2b), and a shank portion (3) extending longitudinally from a side of the head portion opposite to the face surface. A central flushing channel (4) extends longitudinally through the shank portion (3) and a distance within the head portion (2), and a lateral flushing channel (5) extends from the central flushing channel (4) to the circumference (2a) of the head portion (2). A first portion (5a) of the lateral flushing channel is inclined, in a flushing fluid flowing direction, towards the face surface (2b) with respect to said second portion (5b), and correspondingly, a second portion (5b) is inclined, in a flushing fluid flowing direction, towards the shank portion (3). A drill bit assembly and method of manufacturing such a drill bit is also disclosed.