IMPACT ACTION DEVICE Russian patent published in 2015 - IPC E21B4/14 E21B1/30 E21B1/38 E02F7/10 

FIELD: mining.

SUBSTANCE: device includes a housing with a branch pipe having an inlet hole and an exhaust hole(s) made in the wall of the rear part, a striker installed in the housing with a possibility of being moved, a forward motion chamber formed with the branch pipe and the striker, and a reverse motion chamber, a channel in the striker for connection of forward and reverse motion chambers, and a shutoff valve. On the outer surface of the striker in its front part there is an annular groove; the housing includes an anvil. On the inner surface of the housing there is the front annular projection and a restraint of reverse motion of the striker. The shutoff valve is made in the form of an elastic ring installed in the specified annular groove of the striker so that is can interact with the inner surface of the housing. The anvil, the front annular projection and the restraint of reverse motion of the striker are made in the middle part of the housing; the elastic ring of the shutoff valve is installed so that it can interact with the inner surface of the middle part of the housing. The front part of the housing is provided with an accumulation chamber of compressed air with an isolation valve arranged in it. The forward motion chamber is interconnected with the reverse motion chamber trough this accumulation chamber; for that purpose, the latter is provided with a central tube passed into the specified channel of the striker through the hole made in the anvil for supply of compressed air from the accumulation chamber to the reverse motion chamber, and the central tube has a hole for supply of compressed air to the accumulation chamber from the main line. The isolation valve is installed on the outer surface of the central tube with a possibility of axial displacement along it and interaction of the upper end face with the striker through the specified hole made in the anvil, and the lower end face with a flange of the outer surface of the specified tube.

EFFECT: reduction of specific flow rate of compressed air by isolation of compressed air discharge to atmosphere from exhaust till end of direct motion of the striker.

6 cl, 2 dwg