Ground working tool with replaceable teeth

A replaceable tooth for use with a ground working tool, the ground working tool having a tooth holder, the tooth holder comprising a recess for receiving at least part of the tooth, the recess having an upper surface and an opposed lower surface, at least one projection of hard material extending from the upper surface or the lower surface of the recess of the tooth holder, the tooth comprising a distal part for engaging or working the ground or earth during use and a proximal part, the proximal part of the tooth being received within the recess of the tooth holder, the proximal part of the tooth having an upper surface and a lower surface, the tooth having at least one recess on the upper surface or the lower surface of the proximal part thereof, the at least one recess being of complementary size and shape to the at least one projection of hard material in the recess of the tooth holder such that the at least one projection is adapted to be positioned within the at least one recess of the tooth when the tooth is fully inserted into the tooth holder, the at least one recess on the tooth and the at least one projection of hard material in the recess of the tooth holder being arranged such that the tooth can only be fully inserted into the recess of the tooth holder in a single orientation to the tooth holder and the hard material of the at least one projection being sufficiently hard to assist in firmly holding the tooth against lateral movement relative to the tooth holder to maintain alignment of the tooth in the ground working tool and prevent the tooth from being inserted into the recess of the tooth holder when the tooth is not in the single orientation, the at least one projection in the recess of the tooth holder comprising a straight projection extending in a direction generally parallel to a side wall of the tooth holder and the at least one recess in the tooth comprising a straight recess extending in a direction generally parallel to a side wall of the tooth, and the at least one recess on the tooth extending from a proximal end of the tooth towards a distal end of the tooth;

• wherein the at least one projection is located on one only of the upper surface or the lower surface of the recess of the tooth holder and the at least one recess of the tooth is located on one only of the upper surface or the lower surface of the tooth.

A tooth holder fora ground working tool, the tooth holder comprising a recess for receiving at least part of a tooth, the recess having an upper surface and an opposed lower surface, at least one projection of hard material extending from the upper surface or the lower surface of the recess of the tooth holder, the tooth comprising a distal part for engaging or working the ground or earth during use and a proximal part, the proximal part of the tooth being received within the recess of the tooth holder, the proximal part of the tooth having an upper surface and a lower surface, the tooth having at least one recess on the upper surface or the lower surface of the proximal part thereof, the at least one recess being of complementary size and shape to the at least one projection of hard material into the recess of the tooth holder such that the at least one projection is adapted to be positioned within the at least one recess of the tooth when the tooth is fully inserted into the tooth holder, the at least one recess on the tooth and the at least one projection of hard material in the recess of the tooth holder being arranged such that the tooth can only be fully inserted into the recess of the tooth holder in a single orientation to the tooth holder and the hard material of the at least one projection being sufficiently hard to assist in firmly holding the tooth against lateral movement relative to the tooth holder to maintain alignment of the tooth in the ground working tool and prevent the tooth from being inserted into the recess of the tooth holder when the tooth is not in the single orientation, the at least one projection in the recess of the tooth holder comprising a straight projection extending in a direction generally parallel to a side wall of the tooth holder and the at least one recess in the tooth comprising a straight recess extending in a direction generally parallel to a side wall of the tooth, and the at least one recess on the tooth extending from a proximal end of the tooth towards a distal end of the tooth;

• wherein the at least one projection is located on one only of the upper surface or the lower surface of the recess of the tooth holder and the at least one recess of the tooth is located on one only of the upper surface or the lower surface of the tooth.

A ground working tool comprising a tooth holder and a replaceable tooth, the tooth holder comprising a recess for receiving at least part of the tooth, the recess having an upper surface and an opposed lower surface, at least one projection of hard material extending from an upper surface or a lower surface of the tooth, the tooth comprising a distal part for engaging or working the ground or earth during use and a proximal part, the proximal part of the tooth being received within the recess of the tooth holder, the proximal part of the tooth having the upper surface and the lower surface, the tooth holder having at least one recess on the upper surface or the lower surface of the recess of the tooth holder, the at least one recess being of complementary size and shape to the at least one projection of hard material on the tooth such that the at least one projection is positioned within the at least one recess provided in the upper surface or the lower surface of the recess of the tooth holder when the tooth is fully inserted in the recess of the tooth holder, the at least one recess on the tooth holder and the at least one projection of hard material on the tooth being arranged such that the tooth can only be fully inserted into the recess of the tooth holder in a single orientation to the tooth holder and the hard material of the at least one projection being sufficiently hard to assist in firmly holding the tooth against lateral movement relative to the tooth holder to maintain alignment of the tooth in the ground working tool and prevent the tooth from being inserted into the recess of the tooth holder when the tooth is not in the single orientation, the at least one projection on the tooth comprising a straight projection extending in a direction generally parallel to a side wall of the tooth and the at least one recess in the tooth holder comprising a straight recess extending in a direction generally parallel to a side wall of the tooth holder, and the at least one recess on the tooth holder extending in a direction from a distal end of the tooth holder towards a proximal end of the tooth holder;

• wherein the at least one projection is located on one only of the upper surface or the lower surface of the tooth and the at least one recess of the tooth holder is located on one only of the upper surface or the lower surface of the tooth holder.

A replaceable tooth for use with a ground working tool, the ground working tool having a tooth holder, the tooth holder comprising a recess for receiving at least part of the tooth, the recess having an upper surface and an opposed lower surface, at least one projection of hard material extending from an upper surface or a lower surface of the tooth, the tooth comprising a distal part for engaging or working the ground or earth during use and a proximal part, the proximal part of the tooth being received within the recess of the tooth holder, the proximal part of the tooth having the upper surface and the lower surface, the tooth holder having at least one recess on the upper surface or the lower surface of the recess of the tooth holder, the at least one recess being of complementary size and shape to the at least one projection of hard material on the tooth such that the at least one projection is positioned within the at least one recess provided on the upper surface or the lower surface of the recess of the tooth holder when the tooth is fully inserted in the recess of the tooth holder, the at least one recess in the tooth holder and the at least one projection of hard material on the tooth being arranged such that the tooth can only be fully inserted into the recess of the tooth holder in a single orientation to the tooth holder and the hard material of the at least one projection being sufficiently hard to assist in firmly holding the tooth against lateral movement relative to the tooth holder to maintain alignment of the tooth in the ground working tool and prevent the tooth from being inserted into the recess of the tooth holder when the tooth is not in the single orientation, the at least one projection on the tooth comprising a straight projection extending in a direction generally parallel to a side wall of the tooth and the at least one recess in the tooth holder comprising a straight recess extending in a direction generally parallel to a side wall of the tooth holder, and the at least one recess on the tooth holder extending in a direction from a distal end of the tooth holder towards a proximal end of the tooth holder;

• wherein the at least one projection is located on one only of the upper surface or the lower surface of the tooth and the at least one recess of the tooth holder is located on one only of the upper surface or the lower surface of the tooth holder.

A tooth holder for a ground working tool, the tooth holder comprising a recess for receiving at least part of a tooth, the recess having an upper surface and an opposed lower surface, at least one projection of hard material extending from an upper surface or a lower surface of the tooth, the tooth comprising a distal part for engaging or working the ground or earth during use and a proximal part, the proximal part of the tooth being received within the recess of the tooth holder, the proximal part of the tooth having the upper surface and the lower surface, the tooth holder having at least one recess on the upper surface or the lower surface of the recess of the tooth holder, the at least one recess being of complementary size and shape to the at least one projection of hard material on the tooth such that the at least one projection is positioned within the at least one recess provided on the upper surface or the lower surface of the recess of the tooth holder when the tooth is fully inserted in the recess of the tooth holder, the at least one recess in the tooth holder and the at least one projection of hard material on the tooth being arranged such that the tooth can only be fully inserted into the recess of the tooth holder in a single orientation to the tooth holder and the hard material of the at least one projection being sufficiently hard to assist in firmly holding the tooth against lateral movement relative to the tooth holder to maintain alignment of the tooth in the ground working tool and prevent the tooth from being inserted into the recess of the tooth holder when the tooth is not in the single orientation, the at least one projection on the tooth comprising a straight projection extending in a direction generally parallel to a side wall of the tooth and the at least one recess in the tooth holder comprising a straight recess extending in a direction generally parallel to a side wall of the tooth holder, and the at least one recess on the tooth holder extending in a direction from a distal end of the tooth holder towards a proximal end of the tooth holder;

• wherein the at least one projection is located on one only of the upper surface or the lower surface of the tooth and the at least one recess of the tooth holder is located on one only of the upper surface or the lower surface of the tooth holder.