公开(公告)号：EP4339416A3

公开(公告)日：2024-05-29

申请号：EP24155400.5

申请日：2021-03-25

申请人： Mincon International Limited

发明人： KESKINIVA, Markku ,  SEXTON, Ben

IPC分类号： E21B1/30 ,  E21B1/38 ,  E21B4/14 ,  E21B10/36

CPC分类号： E21B10/36 ,  E21B4/14 ,  E21B1/38 ,  E21B1/30

摘要： The present invention relates to a fluid-operated percussion drill tool (1) comprising an outer wear sleeve (2) comprising a substantially cylindrical wall (3) and having inner (4) and outer (5) surfaces. The tool also comprises a percussion bit (6) having a head portion (7) and a bit retaining portion (8) and located at a forward end (9) of the outer wear sleeve. The tool further comprises a sliding piston (10) mounted for reciprocating movement within the outer wear sleeve to strike the percussion bit. The tool also includes a drive ring (11) having a substantially cylindrical wall (12) and comprising connection means (13) adapted for connecting the drive ring to a drive means of the fluid-operated percussion drill tool. At least one flushing channel (31) provides a fluid path to the cutting face of the bit for a flushing medium. A first portion (32) of the at least one flushing channel extends longitudinally within the wall (3) of the wear sleeve, a second portion (36) of the at least one flushing channel extends longitudinally within the wall (12) of the drive ring and a third portion (40) of the at least one flushing channel extends through the head portion (7) of the percussion bit to the cutting face (43) of the bit.