DEVICE FOR PNEUMATIC IMPACT MECHANISM WITH THROTTLING AIR DISTRIBUTION Russian patent published in 2021 - IPC E21C37/24 B25D9/04 B25D9/26 B25D17/02 

FIELD: construction; mining industry.

SUBSTANCE: invention relates to pneumatic impact devices. Device comprises a cylindrical housing with outlet channels, an annular flange with a through central hole, a cover with an inlet, a working tool with a shank, step striker with rod and piston parts, rod in central hole of annular flange with piston part with inclined channel groove, constantly located in through axial hole of stepped striker, sleeve of cylindrical housing with hole in sleeve, annular neck, limiting the movement value of stepped striker, barrel fixed to cylindrical housing with air supply channel, annular distribution chamber in cylindrical housing bushing, network air chamber between shell and cover, between the cover plate and the annular flange, the idle stroke chamber on the side of the annular flange, the idle stroke chamber on the side of the working tool shank retained by the spring relative to the cylindrical body. Channel-groove on side surface of piston part of rod has variable geometrical cross-section, increasing from the side surface of the piston part from the side of the rod to the end of its piston part from the side of the through axial bore of the stepped drummer. Between the rod part of the stepped impactor and the cylindrical body, on the side of the annular isthmus of the sleeve, an annular controlled working stroke chamber is formed, and on the side surface of the rod part of the stepped striker there is an air bypass channel in the form of a tier of annular cylindrical controlled channel-recesses, separated by bridges along generatrix of stock part of step striker with varying geometrical cross-section area and so that length of tier cylindrical controlled air bypass channel-recesses, separated by bridges, depending on the position of stepped hammer, sufficient for periodic communication of annular distribution chamber and circular controlled chamber of working stroke between each other.

EFFECT: higher efficiency of using internal air energy of annular controlled chamber of working stroke.

1 cl, 1 dwg