| 摘要 |
FIELD: drilling equipment, particularly guiding tubes and drilling strings to provide mechanical feed in drilling equipment. ^ SUBSTANCE: guiding pipe comprises outer diameter substantially constant along longitudinal axis thereof and has inner thread formed in orifice in the first pipe end. The pipe is also provided with outer thread formed on the second pipe end and through flushing channel to transfer flushing medium to drilling bit for percussive hammer drilling. The orifice is located along guiding pipe and has the first axial length. The guiding pipe has cylindrical neck located near the first end thereof. The neck has axial length exceeding that of the orifice. ^ EFFECT: simplified thread disconnection and increased service life of the connections. ^ 10 cl, 10 dwg |
