APPARATUS FOR DIRECTED DRILLING BY PERCUSSION-ROTARY METHOD Russian patent published in 1995 - IPC

FIELD: mining. SUBSTANCE: apparatus has plunger with displaced center of gravity, on lower butt of which there is a pivot, mounted coaxially to plunger and so as to be capable for adjustable turning in respect to plunger. Lower butt of pivot has eccentrically made bulge. Plunger displaced center of gravity makes it to line up strictly with apsidal plane during mechanism operation in inclined borehole, and pivot with bulge, fixed at any given angle in respect to plunger's center of gravity, ensures delivery of oriented in accordance with required direction of curvature, eccentric strokes on rock crushing tool. Adjustment of curvature rate is carried out by pivot bulge motion in limits of space from geometric center to its edge. EFFECT: apparatus for directed drilling by percussion-rotary method is used in mining. 8 dwg