PNEUMATIC IMPACT MECHANISM Russian patent published in 2016 - IPC E21B1/30 E21B1/38 E21C37/24 

FIELD: construction.

SUBSTANCE: invention relates to construction and mining industry, in particular to pneumatic devices of impact action. Device includes cylindrical housing with bushing and outlet channels, working tool with shank, stepped striker dividing cavity of cylindrical housing to circular distribution chamber within bushing of cylindrical housing at side of striker rod part, chamber of idle stroke at side of working tool shank, and annular chamber of working stroke at side of bushing, annular flange with holes to feed air into annular distributing chamber and through axial channel for passage of rod with shutoff valve, fastening shell fixed relative to cylindrical case, chamber of circuit air formed by fastening shell with air feed channel and annular flange. Inner surface of cylindrical housing bushing is equipped with bypass channel, in form of slot without output to end of bushing from annular chamber of working stroke, and on side surface of rod part of stepped striker at side of annular chamber of working stroke has screw slot channel without output to end of rod part of stepped striker. Bypass channel of bushing and screw slot channel are separated between each other, when annular chamber of working stroke is open to atmosphere via outlet channel.

EFFECT: higher energy of single impact and avoiding air wastage in annular chamber of working stroke.

1 cl, 1 dwg