Patent ID: 8215414
Filing Date: 2012-07-10
Classification: B25D,E21B

Abstract:
1. Pulse drilling machine for the generation of shock wave pulses in a tool direction (R) including a housing wherein an impulse piston is arranged, and including means for abruptly changing a fluid pressure influencing the impulse piston in order to achieve a force resultant on the impulse piston in the tool direction and thereby generate a shock wave pulse in a drill string which is connected to the machine, wherein inside the housing there is arranged a first fluid chamber inside which pressure fluid in operation is arranged to exert a pressure in the tool direction on the impulse piston, said pulse drilling machine including a fluid flow channel, which includes means for damping a fluid flow flowing from said first fluid chamber through the fluid flow channel obtained when influencing the impulse piston in a direction opposite to the tool direction (R) by rock reflexes in the drill string during drilling.