IMPACT DEVICE Russian patent published in 1994 - IPC

FIELD: compaction of earth. SUBSTANCE: impact device comprises casing with exhaust holes, power chambers of forward and reverse strokes formed by flexible circular cups, working impact member whose channel communicates with reverse stroke power chamber, valve device installed in a seat , compressed air supply system, perforated post with support disc. Casing has base in the lower part and a separating partition which forms, together with upper part of casing , a receiver communicating with compressed gas supply system. Working member carries perforated post with support disc, forward stroke power chamber is arranged between said support disc and separating partition, said chamber communicating with receiver, while reverse stroke power chamber is disposed between base and working member. Channel is of the through type and communicates with reverse stroke power chamber by radial channels disposed in its lower part while the upper part of the channel has a seat. Active area of the reverse stroke power chamber is larger than that of the forward stroke power chamber. Casing may have adjusting rod, valve device has the form of flexible diaphragm one end of which is secured in spring-loaded valve with holes, while the other end is secured between ring and cover, constituting a power chamber in the latter. Cover may communicate through a hole with under-valve box which has a spring-loaded button for discharge of compressed gas, said button contacting with rod. Casing may have stops inside for limiting the upper stroke of working member. Flexible circular cups of power chamber may be made from autotires. EFFECT: improved design. 4 cl, 1 dwg