PNEUMATIC IMPACT MECHANISM OF SOIL INTAKE DEVICE Russian patent published in 2015 - IPC E02F5/16 E21B4/14 

FIELD: construction.

SUBSTANCE: pneumatic impact mechanism comprises a pneumatic impact mechanism with outlet holes enclosed into a cylindrical cavity of the body, an air supply box with a precombustion chamber of network air and an anvil, a striker with a slide valve in the form of a stepped tube with a larger step, which controls air outlet, a stepless tube for a soil core stretched via the body, a striker and a slide valve. The striker separates the cylindrical cavity of the body into a discharge chamber at the side of the air supply box and an idle running chamber at the side of the anvil, is made with outlet side holes and an inner circular chamber of operating cycle connected with the slide valve, and is installed with a gap relative to the body. The large step of the stepped tube continuously closes outlet side holes of the striker at the side of the inner circular chamber of operating cycle. Coaxially with a gap between the stepless and stepped tubes there is an additional stepless tube forming a circular channel that connects continuously an antechamber of network air in an air-distributing box with the chamber of idle running by means of a side hole in a wall of the additional stepless tube with its rest in the anvil.

EFFECT: increased energy of impact of a pneumatic impact mechanism.

1 dwg