Patent ID: 7325882
Filing Date: 2008-02-05
Classification: E21C,E21D

Abstract:
1. A rock cutting machine including: a boom rotatably mounted at a proximal end to a chassis adapted to be placed adjacent a rock face to be cut such that the boom extends from the chassis to a distal end adjacent the rock face, the boom having a longitudinal boom axis extending between the proximal and the distal ends, and a cutting device including an oscillating disc cutter, said cutter having an oscillation axis, said device being pivotally mounted to the boom about a pivot axis at or adjacent the distal end of the boom and caused to pivot in use about the pivot axis by a drive mechanism, the pivot axis being offset from the longitudinal oscillation axis of the cutting device, wherein the pivot axis is offset from the oscillation axis of the cutting device by a distance sufficient to cause a cutting disc on the oscillating disc cutter to withdraw slightly from the rock face in use during pivoting of the device about the pivot axis.