E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/13
E21B 1/00 (2006.01)
Patent
CA 1255289
- 10 - DEVICE FOR MAKING HOLES IN SOIL ABSTRACT The invention relates to the construction equipment. A device comprises a body internally accommodating a per cussion member with ports, an air distributing sleeve, an elastic element and a threaded bushing. Grooves are made on an external surface of the threaded bushing at an angle to the axis of the device. When the device is moving soil gets in the grooves of the threaded bushing and develops a circumferential force fixing the threaded bushing relative to the body.
510864
Kostylev Alexandr D.
Plavskikh Vladimir D.
Skachkov Konstantin B.
Terskov Alexei D.
Institut Gornogo Dela Sibirskogo Otdelenia Akademii Nauk Sssr
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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