Mixer knife and apparatus with mixer knife

A system comprising:

• an agricultural mixer apparatus comprising:
• a frame;
• a tub mounted on the frame and defining an interior for receiving ingredients of animal feed;
• an auger positioned in the interior of the tub and being rotatable with respect to the frame, the auger including a central mast rotatably mounted on the frame and flighting mounted on the central mast to rotate with the mast, the flighting having an outer edge;
• and
• a mixer knife mounted on the auger and positioned to extend from the auger to engage ingredients of animal feed in the interior of the tub, the knife comprising:
• a plate having a first side and a second side, a portion of the first side forming a first face and a portion of the second side forming a second face, the plate having a perimeter positioned between the first and second sides, the perimeter having a leading extent for being moved by the auger toward the material to be cut and a trailing extent opposite of the leading extent;
• wherein the plate has a cutting edge located on the leading extent of the perimeter, the cutting edge being serrated with a plurality of edge sections arranged in a stepped contiguous relationship along the cutting edge, the plurality of edge sections including primary edge sections and secondary edge sections;
• the primary edge section having a sharp tip formed by a pair of converging surfaces, the pair of converging surfaces comprising a first converging surface and a second converging surface, the first converging surface being adjacent to the first face of the plate and the second converging surface being adjacent to the second face;
• wherein the second converging surface has a first region and a second region, the first region being concave and depressed into the plate with respect to the second region;
• and
• wherein the first region is elongated along a first axis extending substantially parallel to the primary edge section of the cutting edge.

An agricultural mixer knife for mounting on an auger of an agricultural mixer apparatus, the knife comprising:

• a plate having a first side and a second side, a portion of the first side forming a first face and a portion of the second side forming a second face, the plate having a perimeter positioned between the first and second sides, the perimeter having a leading extent for being moved by the auger toward the material to be cut and a trailing extent opposite of the leading extent;
• and
• wherein the plate has a cutting edge located on the leading extent of the perimeter, the cutting edge being serrated with a plurality of edge sections arranged in a stepped contiguous relationship along the cutting edge, the plurality of edge sections including primary edge sections and secondary edge sections;
• the primary edge section having a sharp tip formed by a pair of converging surfaces, the pair of converging surfaces comprising a first converging surface and a second converging surface, the first converging surface being adjacent to the first face of the plate and the second converging surface being adjacent to the second face;
• wherein the second converging surface has a first region and a second region, the first region being concave and depressed into the plate with respect to the second region, the first region being elongated along a first axis extending substantially parallel to the primary edge section;
• and
• wherein the first regions of the second converging surfaces of the primary edge sections are arranged with respect to the cutting edge of the plate so that the first axes of the first regions are oriented substantially parallel to each other in spaced relationships to each other.