Patent ID: 8678516

Claim:
A mining machine, comprising: a rotatable member; and one or more pick and holder assemblies mounted on the rotatable member, each pick and holder assembly comprising: a pick holder having a bore therethrough and a polygonal shaped barrel at a frontward end; a tool pick having a shoulder, a cutting tip extending frontwardly with respect to the shoulder, and a shank extend rearwardly with respect to the shoulder; and a polygonal shaped shield washer mating with the polygonal shaped barrel of the pick holder, the washer being located rearwardly adjacent to the shoulder of the tool pick, the washer including a top having an interior opening and outer periphery defined by plurality of edges, each pair of adjacent edges being joined at a corner, the washer further including a skirt extending rearwardly from the outer periphery of the top, the skirt having a plurality of edges and corners aligned with the edges and corners of the top.