The male section for the bombardment type rotary rock, being the male section for the bombardment type rotary rock

摘要

According to this invention, the male type section for the shocking type rotary rock which has the part of the reduction decrease cross-sectional area (10) is offered, at least the part where one end of the male type section it has the screw thread for one shocking type rotary rock (16) is provided. The end of the male type section has this contact surface in order to transmit the sonic boom (14). The aforementioned part (16) length (L), it is defined major diameter of the screw thread (Dy) the cylinder which touches (C) shocking transmission surface plane surface (P) from as length. The aforementioned length (L) as for the value which is divided at major diameter of the cylinder it is inside the range 1 - 2. This invention, furthermore, regards the drill bit and the screw terminal.