PROBLEM TO BE SOLVED: To provide a rotary tiller which eliminates the need to use another member when a lateral center portion of a lower side part of a flat plate is latched to a regulating member during a ridging operation.SOLUTION: A support plate 25 is provided with an engaging portion 25h which engages with the regulating member 15 when the support plate 25 is set in a vertical attitude to regulate movement of the lateral center portion 21 of the flat plate toward the rear of a cover and which is disengaged from the regulating member 15 when the support plate 25 is set in a horizontal attitude to permit movement of the lateral center portion 21 of the flat plate toward the rear of the cover.COPYRIGHT: (C)2012,JPO&INPIT【課題】畝立て作業時において平板の下辺部の横方向中央部を規制部材に掛止させる際に別部材を使用する必要のないロータリ耕耘装置を提供すること。【解決手段】支持板25を縦向き姿勢に設定すると、規制部材15に係合して平板の横方向中央部21のカバー後方への移動を規制し、且つ支持板25を横向き姿勢に設定すると規制部材15との係合が解除されて平板の横方向中央部21のカバー後方への移動を許容する係合部25hを支持板25に備えてある。【選択図】図11
