PNEUMATIC DEVICE OF IMPACT ACTION TO FORM WELLS IN SOIL Russian patent published in 2011 - IPC E02F5/16 

FIELD: construction.

SUBSTANCE: device comprises hollow body with stepless striker arranged in it with central through channel, which separates cavity of body into chambers of working and idle stroke, tube interacting with central through channel of striker, threaded bushing with permanently open channel of inlet and hose for supply of compressed air from the network, cover with radial channel of overflow and through central hole for tube passage, service air prechamber formed between threaded bushing and cover, tail that forms a soil chamber with body and entering idle stroke chamber, tail and threaded bushing arranged with through channels for tube passage, cover installed in central hole with circular gap forming throttle channel of inlet into working stroke chamber. Additional holes are provided in body at tail side with outlet to soil chamber. Between tail and body there is an additional circular service chamber, which is permanently communicated to main service chamber, idle stroke chamber and soil chamber, besides, channel that communicates additional circular service chamber and soil chamber between each other is arranged in the form of nozzle expanding at side of additional circular service chamber.

EFFECT: additional holes in body at side of tail make it possible to reduce front resistance of soil by partial soil take-off, and air arriving through nozzle from additional circular service chamber is used to transport soil via through channel in tube, and exhausted spent air of chambers of working and idle strokes also helps.

1 dwg