Patent ID: 7992651

Claim:
A tillage blade comprising: (a) a blade disposed about a rotational axis and having an outer periphery disposed radially outwardly from the rotational axis; (b) a plurality of waves formed by deviating the entire outer periphery of the blade from a flat plane; (c) a plurality of crests and a plurality of valleys, wherein each of said plurality of waves comprises a first and a second crest and one valley between the first and second crests at the outer periphery thereof; (d) a plurality of amplitudes, wherein at least one of said plurality of waves exhibits a maximum deviation of each of the plurality of amplitudes from the flat plane at the outer periphery thereof; and (e) a notch being disposed in each respective wave on the outer periphery of the blade so that a radius of the blade from the rotational axis to the outer periphery of the blade at the notch is less than a radius taken on the blade at an outer periphery where there is no notch, and wherein at least a majority of the notch is disposed between the first one of the respective crests and the respective valley, such majority of the notch being closer to the first respective crest than to the second respective crest, the notch being formed about a radius that is located radially outwardly from the outer periphery of the blade, the outer periphery where there is no notch is disposed between adjacent notches and wherein there is only one notch between adjacent crests.