Patent ID: 7063165

Claim:
A turf aerator comprising: (a) a horizontal disc cutter shaft having first and second ends that are supported in a disc carrier frame; (b) a plurality of rotating aerator planar discs, spaced along the horizontal disc cutter shaft, each planar disc having: (i) a central part of a first diameter and a centrally-located axis of rotation, said central part including a hole, centered on the axis of rotation and through which the disc cutter shaft extends, and (ii) a plurality of substantially planar cutting teeth distributed around the circumference of the planar disc and extending outwardly from and co-planar with the central part, and (1) each of the cutting teeth having a leading cutting edge formed by first and second straight cutting edge segments; (2) the first straight cutting edge segment being a first straight length of material that extends between first and second points that lie along a first line segment, the first and second points being outside the first diameter, the first line segment extending radially along a ray that originates at a first origin point that is inside the first diameter, away from the hole and on a first side of the axis of rotation, such that the ray is offset from the axis of rotation, (3) a second straight cutting edge segment being a second straight length of material that extends between the second point and a third point, in a direction of rotation, that both lie along a second line segment, the second line segment extending radially along a ray that originates at a second origin point that is inside the first diameter, away from the hole and on a second side of the axis of rotation, and (4) each cutting blade having an elliptical convex trailing edge that extends from the third point back to a fourth point outside the central part; and (c) an arm, extending from and orthogonal to the disc carrier frame.