PERCUSSION DEVICE Russian patent published in 2008 - IPC E21C37/00 E02F5/30 

FIELD: mining industry.

SUBSTANCE: said invention relates to mining industry, building and construction, and metallurgy, in particular, to percussion devices for disintegration of rock and concrete, ripping of frozen soil and filled ground compaction. The percussion device incorporates body 1 with located therein coaxial straight case 6, the lower end of which is rigidly secured to the bottom end of body 1; in its axial bore 26, together with body 1, travelling generatrixes of arming 7, overflow 8, drain and gas 11 cavities are installed, as well as knocker 4 with piston hook 5 in the middle section, stationary interfaced with inner side of straight case 6 and coaxial annular step valve 12 encircling knocker 4 and straight case 6. The said valve 12 has four outer and three inner steps on side surfaces. Valve 12, along the side of the smallest upper step, is stationary interfaced with body 1 and has a circular groove 15. Circular groove 15 is located between two upper outer steps 13, 14 and, together with body 1, forms a ring channel, which interconnects arming cavity 7 with pressure line in the lowermost position of valve 12, in which the bottom end of the smallest inner step of the latter contacts the free end of straight case 6, and is interfaced with it along the side surface of the medium inner step. The largest inner step of valve 12, together with straight case 6, forms annular slot 25 of specified size, which connects arming cavity 7 of the device with isolated cavity between straight case 6 and valve 12 and connected to the said ring channel by means of radial openings 9 in the side wall of the largest step of valve 12.

EFFECT: improved efficiency and reliability of the percussion device.

5 cl, 3 dwg