TILLAGE BLADE CONFIGURED TO STAY SHARP LONGER

摘要

A tillage blade having a sharpened outer peripheral edge on a blade body has a predetermined thickness. An annular portion of the blade is disposed between the outer peripheral edge and the body having a thickness which is less than the thickness of the body of the blade, the annular portion having a radially outer part and a radially inner part. The blade is tapered from the sharpened peripheral edge to the radially outer part of the annular portion and the blade is tapered from the radially inner part of the annular portion to the body. By making the sharpened bevels on out outer periphery of the blades taper in steps instead of just sharpening them by making either one bevel on one side, or a bevel on each side of the outer periphery of the blade, the blade will last longer than prior art tillage blades.