PNEUMATIC PERCUSSION MECHANISM Russian patent published in 2015 - IPC E21B1/30 E21C37/22 

FIELD: machine building.

SUBSTANCE: invention relates to building industry and mining, in particular to the pneumatic devices with impact action. The percussion mechanism includes cylindrical casing with inlet channels, ring flange with through central hole, work tool with shank, step striker with stock part, rod with piston part installed in the central hole of the ring flange, piston part is permanently in the through axial hole of the step striker, ring chamber of the pneumatic buffer, bushing of the cylindrical casing with hole for the stock part passage, creating from side of the ring chamber of the pneumatic buffer a ring bridge limiting movement of the step striker, secured relatively to the cylindrical casing of the sleeve with channel for ail feeding, ring distributing chamber in the bushing of the cylindrical casing, chamber of network air from the side of the ring flange, idle stroke chamber at side of the work tool shank, held by the spring relatively to the cylindrical casing. Channel-slot on the side surface of the rod piston part interacting with the through axial hole in the step striker is made helical.

EFFECT: reduced air backpressure in the idle stroke chamber at and of the work stroke, increased impact energy, and frequency of impact of the pneumatic striker.

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