Patent ID: 7172146

Claim:
A grinding and impeller clip for attaching to a wheel assembly mounted on a center shaft defining an axis of rotation and configured for rotational motion within a process chamber of a material size reducing system, the clip comprising: a) a clip body defining a base portion, the base portion being configured to facilitate the engagement of the clip body to the wheel assembly; and b) an elongated wing portion, the wing portion extending outwardly from the base portion along a first axis and defining a length generally parallel to the first axis, the wing portion including upper and lower surfaces, wherein the upper surface includes a protective outer layer of a material having greater resistance to damage from the material size reducing system than another portion of the wing portion, wherein the cross section of the wing generally perpendicular to the first axis gradually reduces from each outer edge of the cross section toward a center of the cross section along the lower surface along a majority of the length of the wing portion.