PROBLEM TO BE SOLVED: To aim at the improvement of cost with the reduction in number of components by simplifying the folding structure of extended ground-leveling bodies.SOLUTION: This rotary tiller including a main cover 11 for covering the upper side of tilling claws 8, a rear cover 13 pivoted at the rear end of the main cover 11 as vertically freely rotatable, and extended ground-leveling bodies 17L, 17R attached to a ground-leveling body attached to the rear cover 13 or the rear end of the rear cover 13, as freely foldable is provided by installing/fixing brackets 18 at the right and left both ends of the ground-leveling body attached to the rear cover 13 or the rear end of the rear cover 13 to pivot the extended ground-leveling bodies 17L, 17R as freely rotatable, also installing as extending springs 16 over pins 25 installed as fixed on the brackets 18 and the extended ground-leveling bodies 17L, 17R to make the extended ground-leveling bodies 17L, 17R as capable of freely switching to a working posture B and a housed posture A, and further in the housed posture A, constituting so that the base part 21 of the extended ground-leveling bodies 17L, 17R is positioned at the housed posture A by making a contact with the pins 25.COPYRIGHT: (C)2011,JPO&INPIT【課題】延長整地体の折畳み構造を簡潔化して部品点数の低減によるコストの改善を図る。【解決手段】耕耘爪8の上方を覆うメインカバー11と、メインカバー11の後端に上下回動自在に軸支されるリヤカバー13と、該リヤカバー13、又はリヤカバー13の後端に装着される整地体に折畳み自在に装着される延長整地体17L,17Rとを備えるロータリ耕耘装置において、前記リヤカバー13、又はリヤカバー13の後端に装着される整地体の左右両端にブラケット18を固設して、延長整地体17L,17Rを回動自在に枢支すると共に、当該ブラケット18に固設したピン25と延長整地体17L,17Rとに亘ってスプリング16を張設して、延長整地体17L,17Rを作用姿勢Bと収納姿勢Aとに切替え自在になし、さらに、この収納姿勢Aにおいて延長整地体17L,17Rの基部21は、前記ピン25に接当して、収納姿勢Aに位置決めされるように構成した。【選択図】図3
