| 摘要 |
A device for making holes in the ground comprises a casing (1), a drive and a casing part (2) conjugating with the casing through a thread (4) and provided on its external lateral surface (6) with a protrusion (7) serving as a means to stop the casing part in relation to the casing and protruding beyond the limits of the casing. One of the lateral faces (10) of the protrusion (7) is inclined in relation to the generatrix of the lateral surface (6) of the casing part in the direction of screwing up the joining thread. An additional protrusion (12) is provided on the lateral surface of the casing part, which serves to create a screwing up torque on the joining thread when the device is reversed. |
