Device for making holes in soil

摘要

PCT No. PCT/SU86/00043 Sec. 371 Date Dec. 11, 1987 Sec. 102(e) Date Dec. 11, 1987 PCT Filed Apr. 30, 1986 PCT Pub. No. WO87/06638 PCT Pub. Date Nov. 5, 1987.The invention relates to the construction equipment. A device comprises a body (1) internally accommodating a percussion member (2) with ports (5), an air distributing sleeve (6), an elastic element (7) and a threaded bushing (8). Grooves (9) are made on an external surface of the threaded bushing (8) at an angle to the axis of the device. When the device is moving soil gets in the grooves (9) of the threaded bushing (8) and develops a circumferential force fixing the threaded bushing (8) relative to the body (1).