Patent ID: 8333435

Claim:
A cutting blade for cutting rock or hard earth formations, the cutting blade comprising: a body having an attachment surface at an outer peripheral surface portion of the body, and a plurality of tooth holders for holding teeth in a plurality of directions, each tooth holder holding one tooth and the plurality of tooth holders being oriented and attached on the body of a cutting blade within a common plane, each holder comprising: a portion for holding the tooth in a manner such that a portion of the tooth projects from the holder, and a base surface at which the holder is welded to the attachment surface of the body, the base surface being located opposite the portion for holding the tooth and the holder being attachable by welding in a plurality of different orientations in which the tooth projects from the body in a predetermined direction, wherein the base surface has within an area over the attachment surface of the body of the cutting blade a rounded convex shape whereby a region defined between the base surface and the attachment surface is, for at least one of the plurality of different orientations, smaller than a region that would be defined if the base surface would have a flat shape.