IMMERSED PNEUMATIC PERCUSSION TOOL Russian patent published in 2009 - IPC E21B4/14 

FIELD: mining.

SUBSTANCE: immersed pneumatic percussion tool consists of case with journal box arranged in its upper part and equipped with lengthwise channels communicated with pressure duct, of stepped striker with boring in its through central cavity, of cone bit with central exhaust channel and of distributing rod with pressure and exhaust channels containing two coaxially assembled pipes; distributing rod is installed in journal box and stepped striker forming working chambers of direct and reverse run in case. Between external surface of the journal box and internal surface of the case there is formed a circular exhaust chamber, which is connected with exhaust channels of the distributing rod via radial apertures made in the upper part of the journal box and is periodically communicated with the chamber of direct run via the radial apertures made in the lower part of the journal box.

EFFECT: increased efficiency of machine operation due to increased percussion power and reduced noise level of exhaust gases facilitated by dispersion of exhaust flow jets.

3 cl, 3 dwg