PERCUSSION DEVICE Russian patent published in 2005 - IPC

FIELD: dislodging equipment for cutting rock, artificial frangible materials, for loosening frozen ground and for compacting fill-up soil, particularly replaceable tool adapted to be connected to shovel boom and operative tool of fixed high-strength rock dislodging plant.

SUBSTANCE: device has resilient seals, hydropneumatic accumulator piston movably installed in device body and comprising cylindrical shaft connected to piston end facing hydraulic chamber thereof and mating device body. Cylindrical shaft has annular groove formed in medium part thereof and brings end chamber of distribution means having larger diameter into communication with draining pipeline or with working liquid source through body channels. End chamber having lesser diameter permanently communicates with working liquid source. Rear cavity of working stroke chamber located behind working end of percussion piston communicates with working liquid source or with working stroke chamber through body channels and two check valves.

EFFECT: increased efficiency, simplicity and reliability, reduced cost and size, improved manufacturability, prevention of working fluid flow between working stroke chamber and idle stroke chamber, increased impact frequency with a given pump capacity and impact energy.

2 cl, 1 dwg