PNEUMATIC IMPACT MECHANISM Russian patent published in 2018 - IPC E21C37/24 E21B4/14 E21B1/30 B25D9/14 

FIELD: construction; mining.

SUBSTANCE: invention relates to construction and mining industry, in particular to pneumatic devices of impact action. Impact mechanism includes the cylindrical body with the discharge channels, the annular flange with the through center opening, the working tool with the shank, the step-type striker with the stem portion, the rod in the central hole of the annular flange with the piston portion, which is permanently located in the through-going axial hole of the step-type striker, the annular chamber of the pneumatic buffer, the sleeve of the cylindrical body with the opening for passage of the rod part forming the annular neck on the side of the annular chamber of the pneumatic buffer limiting the movement amount of the step-type striker, which is fixed with respect to the cylindrical body, the glass with the air supply channel, the annular distribution chamber in the sleeve of the cylindrical body, the chamber of network air from the side of the annular flange, the idling chamber from the side of the tool shank, which is held by the spring relative to the cylindrical body, the screw channel-groove on the lateral surface of the piston part of the rod, which interacts with the through axial hole in the step-type striker. Outer surface of the rod part of the step-type striker and the inner surface of the sleeve of the cylindrical body are made in the form of truncated cones with mating surfaces with the minimum possible clearance excluding mutual jamming.

EFFECT: reduced air back pressure in the idling chamber at the end of the working stroke, increased impact energy and the impact frequency of the pneumatic impact mechanism.

1 cl, 2 dwg