Rock drilling apparatus

Details Rock drilling apparatus Rock drilling apparatus

E - Fixed Constructions

21

B

255/57

E21B 21/00 (2006.01) B25D 17/08 (2006.01) E21B 17/18 (2006.01)

Patent

CA 1167435

Abstract: Rock drilling apparatus including a pressure fluid driven rock drill- ing machine (10) and a drill unit (11). Said unit (11) including a drill rod (18), a drill bit (16) and a tube (20) surrounding said drill rod (18). Said drill rod (18) having a collar (22) in front of a shank (21), said collar (22) maintaining said tube (20) rotatably therebetween and between said drill bit (16). Said rock drilling machine (10) including coupling device (46; 57), a socket means (42) and a rotation chuck (44) for receiving and holding said tube (20) and shank (21) connected to the machine (10), the tube (20) being radially spaced around said drill rod (18) and non-rotatably connected to said socket means (42).

374530

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