TILLING CLAW

PROBLEM TO BE SOLVED: To provide a tilling claw that suppresses an angular variation of an elevation angle in a cutting edge until the time of application limit, and exhibits the tilling performance superior in inversion properties, plowing properties and clod breaking properties.SOLUTION: A tilling claw includes: a base part (1) attached to a rotary claw shaft (S); a vertical blade part (2) continuously extending from the base part (1) to a vertical lower part, and comprising a flat plate to a horizontal blade curve starting part (F); and a horizontal blade part (3) curved from the vertical blade part (2) in the direction opposite to the rotation direction, and comprising a curved plate curved in one direction to the base part (1) and continuously extending by using the horizontal blade curve starting part (F) as a boundary. The tilling claw is characterized in that the horizontal blade curve starting part (F) is constituted of a circular arc-shape of a folding radius (R1) centering on a folding center (R0), and an angular variation between a first elevation angle (α) in the tilling start in the horizontal blade part (3) and a second elevation angle ( ) in the application limit is set within 5 degrees. 【課題】使用限界時までの刃縁部における仰角の角度変化を抑え、反転性、すきこみ性、砕土性に優れた耕耘性能を発揮する耕耘爪を提供する。【解決手段】回転爪軸（Ｓ）に装着される基部（１）と、前記基部（１）から鉛直下方に連なって伸びる横刃部湾曲開始部（Ｆ）までの平面板からなる縦刃部（２）と、前記縦刃部（２）から回転方向と逆方向に湾曲するとともに、前記基部（１）に対して一方向に湾曲してなり、前記横刃部湾曲開始部（Ｆ）を境として連なって伸びる湾曲板からなる横刃部（３）とを備える耕耘爪において、前記横刃部湾曲開始部（Ｆ）は、折曲中心（Ｒ０）を中心とした折曲半径（Ｒ１）の円弧状からなり、前記横刃部（３）における耕耘開始時の第１仰角（α）と、使用限界時の第２仰角（ ）との角度変化を５度以内に設定することを特徴とする耕耘爪。【選択図】 図１