PROBLEM TO BE SOLVED: To provide a tillage tine which enables to perform the soil-removing work of an elastic cover by the reverse rotation of a tillage tine shaft for a long period.SOLUTION: The tillage tine 101 is so designed that the degree of curve from a longitudinal blade portion to a latitudinal blade portion in a direction reverse to a rotation direction from a longitudinal blade portion to a latitudinal blade portion is enhanced to reduce the distance between a tillage tine shaft O and a top portion X which is the tip of the tillage tine 101. Consequently, the distance of the tillage tine shaft O from the top portion X which is the tip of the tillage tine 101 is reduced, and the affect of wear at the tine tip is reduced, even when tillage work is repeatedly performed. Therefore, the curved portion of a head edge portion 160 can much be left (maintained). Hence, even when the wear of the tillage tine 101 is advanced with the repeated tillage work, the soil-removing work of an elastic cover by the reverse rotation of the tillage tine shaft can be carried out for a long period.COPYRIGHT: (C)2013,JPO&INPIT【課題】耕耘爪軸の逆回転による弾性体カバーの土除去作業を長期的に行うことが可能となる耕耘爪を提供する。【解決手段】耕耘爪101は、縦刃部から横刃部にかけた回転方向と逆向きの湾曲の度合いを高くすることで、耕耘爪101の爪先である頂部Xと耕耘爪軸Oとの距離が近くなるように設計してある。この結果、耕耘爪101の爪先である頂部Xと耕耘爪軸Oとの距離が近くなっており、度重なる耕耘作業を行った場合でも、爪先における摩耗の影響が低減されるようになることから、頭縁部160における曲線形状の部分を多く残す(維持する)ことが可能となる。このため、度重なる耕耘作業に伴い、耕耘爪101の摩耗が進行した状況であっても、耕耘爪軸の逆回転による弾性体カバーの土除去作業を長期的に行うことが可能となる。【選択図】図5
