PROBLEM TO BE SOLVED: To provide a tilling claw that is mainly superior in reversibility.SOLUTION: The tilling claw is provided in which a fitting base, a longitudinal blade part extending from the fitting base, and a transverse blade part extending from the longitudinal blade part and having a curved portion are integrally constituted. The tilling claw is constituted in such a way that a transverse blade tip is formed which has a transverse blade tip curvature starting part being intersected with a transverse blade curvature starting part at approximately 90 degrees, and provided on a lateral tip position or upward more than the lateral tip position, and curved at a second curvature radius in the direction being apart from a reference surface as going to the tip side of the transverse blade part. The tilling claw has a cutting edge distance from a rotation axis continuously changing so as to become the maximum cutting edge distance in the halfway position of the cutting edge of the transverse blade part in a cutting edge shape from a cutting edge starting end to the lateral tip position, and the tilling claw is formed of a vertical side substantially perpendicular to the transverse blade tip curvature starting part and having linear part and extending from lateral tip position, and has a side edge substantially perpendicular to the vertical side and having linear part and extending to the back, and a top for connecting the vertical side and the side edge.SELECTED DRAWING: Figure 1【課題】主として反転性に優れた耕耘爪を提供する。【解決手段】取付け基部と、取付け基部から延びる縦刃部と、縦刃部から延び湾曲部を有してなる横刃部とが一体的に構成される耕耘爪において、横刃部湾曲開始部と略９０度で交わり、且つ横方向先端位置上又は横方向先端位置より上方に設けられる横刃先端部湾曲開始部を有し、横刃部の先端側に向かうに従って基準面から離れる方向に第２湾曲曲率半径にて湾曲されてなる横刃先端部を形成し、刃縁始端から横方向先端位置までにわたる刃縁形状において、回転軸線からの刃縁距離が、横刃部の刃縁の中途位置において最大刃縁距離となるように連続的に変化してなり、横刃先端部湾曲開始部と略直交して直線部を有して横方向先端位置から延びる縦辺と、縦辺と略直交して直線部を有し背部に延びる横辺と、縦辺及び横辺を繋ぐ頂部とによって形成されることを特徴とする耕耘爪。【選択図】図１
