REVERSE PERCUSSION DEVICE Russian patent published in 2006 - IPC E02F5/18 

FIELD: mining and building equipment, particularly to drive pipes and form holes in ground for following underground service pipeline laying.

SUBSTANCE: device comprises body, reciprocating hammer arranged in the body and having throttle channel and orifices for air inlet and discharge, as well as elastic valve. Body and hammer define forward stroke and reverse stroke chambers communicating with air supply pipeline through connection pipe. Collar with longitudinal slots is created on rear hammer end and adapted to communicate reverse stroke chamber with atmosphere. Body interior has several ledges. Elastic valve is installed on hammer between collar and above orifices. When the hammer is in its extreme front position inner cylindrical surface of body ledge having lesser diameter is in contact with outer cylindrical surface of elastic valve.

EFFECT: reduced compressed air consumption and increased stroke power due to decreased reverse stroke chamber size and prevention of air compression inside the reverse stroke chamber during forward hammer movement.

2 cl, 1 dwg