IMMERSIBLE PNEUMATIC PERCUSSION TOOL Russian patent published in 1995 - IPC

FIELD: mining equipment. SUBSTANCE: immersible pneumatic percussion tool has a body with connecting coupling, a distributing sleeve with a rod, having an axial duct, a non-return valve, arranged between the rod and the coupling, a stepped striker with a central outlet duct, dividing a cavity of the body to a chamber of a supply-line pressure and controllable chambers of working and idle strokes between the distributing sleeve and the non-return valve. A supplying-discharging unit is mounted on the rod, the unit being in the form of a stepped valve, whose cavity after a valve member, formed by a small and a large steps of the valve and the rod, is joined with the outlet duct of the striker through an axial and a radial ducts of the rod. An annular turning is formed on a surface of the rod, being embraced by the small step of the valve; that turning forms an annular duct together with the step of the valve. EFFECT: such structure of the stepped valve provides its lowered operation time period and therefore decreased energy transfer agent consumption. 3 cl, 2 dwg