Cutter tooth assembly for an excavating tool

A cutter tooth assembly, comprising:

• a cutter tooth having a shank portion and a cutting portion, the cutter tooth comprising a top surface, a bottom surface opposite the top surface, a first planar front surface extending from the top surface and a second planar front surface extending from the first planar front surface to the shank portion, the second planar front surface formed at an angle with respect to a central, vertical axis of the cutter tooth, the cutter tooth further comprising a convex-shaped side surface extending from the top surface, a first planar side surface extending from the convex-shaped side surface and a second planar side surface extending from the first planar side surface, the second planar side surface formed at an angle with respect to the central, vertical axis of the cutter tooth;
• and
• a cutter tooth holder having a pocket for receiving at least a portion of the cutter tooth, the cutter tooth holder including a first planar side surface with a centrally located opening for cleaning the cutter tooth and for providing additional clearance when mounting the cutting tooth assembly, the pocket having a first tapered surface formed at an angle with respect to the central, vertical axis of the cutter tooth corresponding to the angle of the second planar front surface of the cutter tooth, and a second tapered surface formed at an angle with respect to the central, vertical axis of the cutter tooth,
• wherein the second planar front surface of the cutter tooth cooperates with the first tapered surface of the pocket of the cutter tooth holder, and the second planar side surface of the cutter tooth cooperates with the second tapered surface of the pocket of the cutter tooth holder, thereby minimizing tolerances between the cutter tooth and the pocket of the cutter tooth holder during wear of the cutter tooth assembly during operation.

A cutter tooth assembly, comprising:

• a cutter tooth having a top surface, a bottom surface opposite the top surface, a shank portion and a cutting portion, the cutter tooth comprising a top surface, a bottom surface opposite the top surface, a first planar front surface extending from the top surface and a second planar front surface extending from the first planar front surface to the shank portion, the second planar front surface formed at an angle with respect to a central, vertical axis of the cutter tooth, the cutter tooth further comprising a convex-shaped side surface extending from the top surface, a first planar side surface extending from the convex-shaped side surface and a second planar side surface extending from the first planar side surface, the second planar side surface formed at an angle with respect to the central, vertical axis of the cutter tooth;
• and
• a cutter tooth holder having a top surface, a bottom surface opposite the top surface, and a pocket for receiving at least a portion of the cutter tooth, the pocket having a first tapered surface formed at an angle with respect to the central, vertical axis of the cutter tooth corresponding to the angle of the second planar front surface of the cutter tooth, and a second tapered surface formed at an angle with respect to the central, vertical axis of the cutter tooth,
• wherein the a width of the cutter tooth is largest proximate the top surface of the cutter tooth and narrowest proximate the bottom surface of the cutter tooth,
• wherein the pocket of the cutter tooth holder has a bottom wall, and
• wherein a cross-sectional area of the pocket is largest proximate the top surface of the cutter tooth holder and smallest proximate the bottom wall of the cutter tooth holder.