Patent ID: 7802631

Claim:
An apparatus for working soil, comprising: a frame having a hitch to be pulled behind a tractor in a direction of travel; at least two gang assemblies mounted to said frame, wherein one of said at least two gang assemblies is offset a distance in a direction of travel from a second of said at least two gang assemblies, and wherein each gang assembly extends in a forwardly inclined direction converging from an outside of said frame toward a centerline of said frame in the direction of travel; wherein each gang assembly includes a plurality of tine units slidable onto a shaft to mount said tine units in series for rotation in unison across the width of said shaft, each of said tine units is rotatable about said shaft, each of said tine units having a hub and a plurality of tines extending from said hub; wherein said hub has a first surface defining a first set of indexing features and a second surface defining a second set of indexing features, said first set of indexing features is different in number than said second set of indexing features; and a plurality of indexing spacers slidable onto said shaft for mounting thereon, said plurality of indexing spacers is rotatable about said shaft, said plurality of indexing spacers having a third set of indexing features thereon, at least one indexing spacer of said plurality of indexing spacers separating each tine unit from the next tine unit in said series of tine units, and for assembling said tine units and said spacers on said shaft with said third set of indexing features of said indexing spacers interlocked with selected ones of said first set of indexing features or said second set of indexing features.