PNEUMATIC PERCUSSION MECHANISM Russian patent published in 2025 - IPC E21B1/30 E21B4/14 E21C37/24 B25D9/14 

FIELD: construction; mining.

SUBSTANCE: invention relates to construction and mining, in particular to pneumatic percussion devices. Pneumatic percussion mechanism comprises a cylindrical housing with outlet channels, an annular flange with a through central hole, working tool with a shank, a stepped striker with a rod part, a rod with a piston part installed in the central hole of the annular flange with a screw channel-slot permanently located in the axial channel of the stepped striker, annular chamber of the pneumatic buffer, a bushing of the cylindrical housing with an opening for the rod part of the striker, forming an annular isthmus on the side of the annular chamber of the pneumatic buffer, limiting the movement of the stepped striker, fixed relative to the cylindrical housing a sleeve with an air supply channel, an annular distribution chamber in the bushing of the cylindrical housing, network air chamber on the side of the annular flange with a bypass channel constantly communicating it with the annular distribution chamber, idle stroke chamber on the side of the shank of the working tool, held by a spring relative to the cylindrical housing, wherein the outer side surface of the stock part of the stepped striker and the inner side surface of the bushing of the cylindrical housing are made in the form of truncated cones with mating surfaces with the minimum possible gap, which excludes mutual jamming, between the cylindrical housing and the bushing there is an annular supercharging chamber, which is constantly interconnected by through bypass channels in the bushing wall with an annular distribution chamber and a bypass channel in the annular flange with a network air chamber. Cylindrical housing on the side of the idle stroke chamber is equipped with an annular pad with a recess, which is tightly connected to the outer surface of the cylindrical housing with the formation of an annular supercharging chamber on the side of the idle stroke chamber, which is constantly connected to the idle stroke chamber by radial channels crossing the longitudinal bypass channel in the wall of the cylindrical housing, and radial bypass channels in the cylindrical housing.

EFFECT: reduced air backpressure in the idle stroke chamber and at the end of the working stroke, increased energy and frequency of impacts of the pneumatic percussion mechanism, possibility of using a large amount of air in order to increase the energy of a single impact while maintaining the value of displacement of the striker without increasing the overall size along the length of the body and the cross-sectional area of its working area.

1 cl, 2 dwg