DEVICE FOR FORMATION OF DIRECTED FRACTURES IN BOREHOLES Russian patent published in 2001 - IPC

Abstract RU 2168018 C1

FIELD: mining; applicable in separation of blocks from rock mass, cutting of valuable crystalline raw materials and building stone. SUBSTANCE: device has a cylindrical body with circular projection and working members in the form of wedges on external surface. According to the invention, at least one longitudinal slot is made in the body which ring of flexible material is installed with outer diameter larger than that of borehole. EFFECT: higher reliability of device due to simplification of its design. 4 cl, 2 dwg

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RU 2 168 018 C1

Authors

Kju N.G.

Lekontsev Ju.M.

Frejdin A.M.

Chernov O.I.

Dates

2001-05-27—Published

1999-12-02—Filed