Patent ID: 8517473

Claim:
An adapter board for a moldboard of a piece of road grading equipment, the adapter board comprising: an elongated planar housing including a first edge for mounting to the moldboard; and a plurality of road grading picks mounted on a second edge of the housing, the second edge opposing the first edge, wherein the plurality of road grading picks include a cutting head with a cutting tip at a front end, a shank at a rear end, a shoulder at a transition between the cutting head and the shank, the shoulder including a rearward-facing surface, a friction retainer positioned about at least a portion of the shank, and a washer including an opening in a body extending from a first surface to a second surface, wherein the plurality of road grading picks are rotatably mounted in a bore in the second edge by the friction retainer, wherein the shank is positioned in the opening of the washer with the first surface of the washer contacting the rearward-facing surface of the shoulder and the second surface of the washer contacting the second edge of the adapter board, wherein the opening of the washer is chamfered or countersunk from the first surface and includes an extruded cone projecting from a plane of the second surface, wherein the extruded cone projecting from the plane of the second surface of the washer mates in the bore in the second edge of the adapter board, and wherein edges of washers of adjacent road grading picks contact each other to prevent rotation of the washer greater than 180 degrees.