DEVICE FOR GENERATION OF DIRECTED FRACTURES IN HOLES Russian patent published in 2009 - IPC E21C37/06 

FIELD: mining.

SUBSTANCE: invention refers to mining and can be implemented for separation of blocks from massifs, for extraction of valuable crystal raw material and building stone and for destruction of lumps. The device includes a hollow cylinder body with an end channel for working liquid supply, with apertures in walls, and working members on the exterior surface; the device further includes an elastic sleeve coaxial to the body, and a valve installed at the end of the body. The body is made out of elastic material; the apertures in the walls of the body are made in form of lengthwise slots wherein between the working members in form of rock cutters are installed on the surface of the body. The elastic sleeve is assembled inside the body; one end of the sleeve is connected to a working fluid supply channel, while another is connected to the valve. Tube out of elastic material is installed between the elastic sleeve and the body; the tube has lengthwise slots and is installed so, as to overlap the lengthwise slots of the body.

EFFECT: increased efficiency of device due to generation of directed fractures with even surfaces and in rock of any hardness.

2 cl, 2 dwg