3. The blade of the '570 patent is adapted to be mounted on a drive shaft 58 and is
comprised of a circular disk having teeth 18 formed on the periphery and a
center mount 38 for mounting a drive shaft 58 (col. 8, lines 17 to 43; Figs. 1 and
3b).
4. The '570 blade further has at least one cutting segment 24 formed out of the disk
body. The cutting segment is disposed radially outward of the center mount 38
and radially inward of the peripheral edge (Fig. 1).
5. The cutting segment has a generally triangular shape (Fig. 1).
6. At least one side of each cutting segment 24 is unsevered and forms a juncture
with the disk body (Fig. 1).
7. The cutting segment 24 is deflected outwardly of the plane of the disk body at an
angled orientation relative to the disk body between positions of co-planar and
normal relative to the plane of the disk body and form an opening through the
disk body that is radially inward of the juncture (Figs. I and 3b) .
8. The '570 patent teaches that the cutting segment 24 is created using extrusion
or welding (col. 7, lines 49 to 52).
9. Figure 2 of the '570 patent depict the blade of the '570 patent and appears
below:
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Last modified: November 3, 2007