Abstract: A cutter bit is disclosed having a shank with a forward working portion and multiple inserts mounted on the forward working portion. One of the inserts is a lead insert facing and projecting foremost in the direction of rotation or travel of the bit. A clearance face is provided rearwardly of the lead insert so as to reduce the rubbing action that occurs between the cutter bit and the material formation to be removed. The lead insert can be a laminated insert with a metal shim between individual inserts. Another insert is located rearwardly of the lead insert in the clearance face of the bit and projects out of said clearance face to control the wear of the clearance face during the life of the cutter bit. A cutting edge may be formed on the wear controlling insert projecting from the clearance face.

Abstract: A rotary tool is disclosed which is adapted to be mounted on a machine having power drive means and movable over a field surface to produce furrows therein. The rotary tool comprises bit elements mounted in abutting relation from a peripheral surface of a disc and having compacts of hard wear resistant material which form the leading edge of the bit elements that are to engage the earth.

Abstract: A rotary tool is disclosed which is adapted to be mounted on a machine having power drive means and movable over a field surface to produce furrows therein. The rotary tool comprises bit elements mounted in abutting relation from a peripheral surface of a disc and having compacts of hard wear resistant material which form the leading edge of the bit elements that are to engage the earth.

Abstract: A ripper tooth design is disclosed herein for use with a ripper machine wherein the ripper tooth comprises a generally U-shaped steel body when viewed in side view having a forward working end for engagement with rock formations to be broken and a rearward portion having a recess therein which is adapted for attachment to a shank, which is supported by the ripper machine. The ripper tooth according to the present invention has generally parallel side walls near its rearwardmost portion when viewed in plan, the side walls near the forward portion tapering inwardly toward the center axis of the ripper tooth. A blunt section is formed which extends generally around the front working portion of the generally U-shaped tooth and compacts of hard wear resistant material are imbedded therein to provide a longer working life for the ripper tooth.