Insert teeth for a material breaker machine

An insert tooth assembly which provides a reversibly mounted insert tooth in a durable construction for a material breaker machine, comprising:

• an elongated insert tooth holder having a front face with a recess, said front face extending at an angle to the longitudinal axis of said tooth holder;
• an insert tooth member having a pair of edges, either of which may serve as a cutting edge, each of said pair of edges being formed by two intersecting insert tooth faces including one face which is common to both of said pair of edges, said insert tooth member being positioned in said recess;
• said insert tooth and insert tooth holder having interengaging parts including at least one face extending parallel and at least one face extending perpendicular to said front face of the tooth holder, said interengaging parts being symmetrically positioned about a central insert tooth axis, thus allowing said insert tooth cutting edges to be reversed when said insert tooth is rotated 180 degrees about said central axis, and with one face of the edge which is not in use as the cutting edge being positioned in said recess so as to provide a curable construction, wherein a portion of said angled front face of the tooth holder is coplanar with said common face of the insert tooth member and wherein the other intersecting insert tooth face which forms the cutting edge with said common face is coplanar with another face of said tooth holder;
• and
• means for securing said insert tooth on said tooth holder.