Patent ID: 7726597

Claim:
An anvil for use with a vertical shaft impactor rock crusher, the rock crusher having at least one anvil hanger bracket for receiving the anvil, the at least one hanger bracket further having a cam-seating block, wherein the anvil comprises: a) a disk portion having a cross-sectional shape, the disk portion further comprising a front impact surface, a substantially planar rear surface and a side surface extending therebetween; b) a longitudinal shaft having first and second ends defining a longitudinal axis extending therebetween, the first end disposed on the rear surface, the shaft extending away from the rear surface whereby the axis is substantially perpendicular to the rear surface; c) a cam lobe disposed on the second end of the shaft, the cam lobe having a diameter greater than the diameter of the shaft; d) indexing means disposed on the cam lobe for setting one of a plurality of positions of the anvil when the anvil is seated in the at least one anvil hanger bracket; and e) at least one indexing slot disposed on the side surface, whereby the anvil can be rotated by inserting a lever into the at least one indexing slot and applying force to the lever.