PROBLEM TO BE SOLVED: To provide a tilling claw that is reduced in tilling resistance to enable accelerating a tilling speed and never decrease soil crushing properties and plowing-in performance even if the tilling speed increases.SOLUTION: A tilling claw is provided by integrally forming a mounting base 2, a vertical blade part 3, a horizontal blade part 4 continuously curved from the vertical blade part 3 in the reverse direction to the rotating direction and curved laterally, and has a blade part 5 in the end edge side facing a rotary outer circumferential side. The tilling claw is configured as follows: the blade part 5 has a blade width becoming gradually wider from the vertical blade part 3 side toward the horizontal blade part 4 and becoming the maximum width at the tip of the horizontal blade part 4； a curve beginning line 7 of the horizontal blade part 4 is inclined by 10-15 degrees in angles to the opposite side from the mounting base 2 to the mounting base central line 20； and a curve height H to the tip of the horizontal blade part 4 is substantially the same as the size from the mounting base central line 20 to a curve beginning line position P of a blade end edge 51, and is the size of 1.7-1.9 times of a folding inner side radius r1.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】耕耘抵抗が少なく耕耘作業速度を早くすることを可能とし、耕耘速度が増加しても砕土性やすき込み性能が低下することがない耕耘爪を提供する。【解決手段】取付基部２と、縦刃部３と、縦刃部３から連続して回転方向と逆方向に向けて湾曲するとともに側方に湾曲された横刃部４とが一体となって形成され、回転外周側に面した端縁側に刃部５を有する耕耘爪において、刃部５は、縦刃部３側から横刃部４に向け徐々に刃幅が広くなり、横刃部４先端で最大幅となり、横刃部４の湾曲開始線７は、取付基部中心線２０に対し、取付基部２の反対側に１０度乃至１５度角傾いていて、横刃部４先端までの湾曲高さＨは、取付基部中心線２０から刃部端縁５１の湾曲開始線位置Ｐまでの寸法と略同一であるとともに、折り曲げ内側半径ｒ１の１．７倍乃至１．９倍の寸法である耕耘爪による。【選択図】 図１
