Abstract: A nonrotatable excavating bit comprising a forward working portion and hard wear resistant material attached thereto and having a rearward shank portion which is circular in cross section and is adapted to fit into a circular bore of a support block. An abutment shoulder is formed at the juncture of the forward working portion and rearward shank portion and a tang extends from the shoulder and is adapted to fit down over and mate with a surface of said support block so as to hold the bit nonrotatable in the support block.

Abstract: A stump cutter is disclosed having a rotatable shank upon which a transverse support bar is attached. Tool holders are mounted in a distributed relation on the support bar and replaceable cutter bits are mounted in the tool holders. Mounted on the forward end of either the shank or support bar is a pilot member that holds the stump cutter engaged to the stump during cutting operations.

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.

Abstract: An impact or demolition tool consisting of a rod-like steel holder with one end adapted for being gripped by an impact tool while the other end has inserts of hard wear resistant material, such as a cemented hard metal carbide, imbedded therein in distributed relation.