Patent ID: 7575064

Claim:
An apparatus for aerating soil, comprising: first and second shafts rotatably coupled to a carrier, the first and second shafts being substantially parallel and being radially spaced apart by a separation distance; a first set of soil aeration tines attached to the first shaft, each tine in the first set rotating relative to a ground surface in one of a first set of rotation planes, wherein each tine in the first set fully rotates about the first shaft relative to the carrier without interference from the second shaft; a second set of soil aeration tines attached to the second shaft, each tine in the second set rotating relative to the ground surface in one of a second set of rotation planes, wherein none of the second set of rotating planes overlap any of the first set of rotating planes; and a planetary gear system coupled to the first and second shafts so as to drive the first set of tines to rotate fully about the first shaft and to drive the second set of tines to rotate fully about the second shaft.