PNEUMATIC IMPACT DEVICE FOR DRIVING LENGTHY ELEMENTS INTO SOIL Russian patent published in 2010 - IPC E02D7/10 

FIELD: construction.

SUBSTANCE: device has a striker at working end, impact mass at the opposite end, guide unit for moving of impact mass up and down, lifting unit. Lifting unit has a frame, at side of which there are holes arranged - inlet and outlet ones to air line. Inside body there are pneumatic chambers - accumulating one and working one, arranged with the possibility for piston under the weight to enter it, and distributing element in the centre of body in the form of stem, where valve is located, which closes exhaust hole between working and accumulating chambers, which is located in central upper part of body. The difference of proposed device is availability of additional damper and control pneumatic chambers, arranged one over the other - damper one is higher, control one is below, and availability of partition in damper chamber, which divides chamber into upper and lower parts. Partition has a vertical channel for passage of stem and connection of damper chamber parts over and under partition. The difference is also availability of two pistons: upper and lower ones, with arrangement of the lower one under damper chamber, upper one - under accumulating chamber.

EFFECT: possibility to accurately select impact force with account of soil density and gravity.

1 dwg