PROBLEM TO BE SOLVED: To return an extension leveler to a state before rotation when the extension leveler receives an external force from a ridge, etc., and is rotated relative to an extension apron in a folding implement that is equipped with a body implement positioned behind a tractor and an extension implement foldably connected to the body implement in which the extension implement has the extension apron covering an extension rotor to be connected to a body rotor of the body implement and the extension leveler to be swingably connected to the rear of the extension apron.SOLUTION: The extension leveler 11 is interlocked with shake of a body leveler 6 and shakable in a state in which the extension implement 7 is connected to the body implement 2. When the extension implement 7 is in a folded state and the extension leveler 11 receives an external force, the folding implement is rotatable relative to the extension apron 5. The folding implement is equipped with an urging member 23 that directly or indirectly urges the extension leveler 11 to a side in which the extension leveler 11 is interlocked with the body leveler 6.COPYRIGHT: (C)2010,JPO&INPIT【課題】トラクタの後方に位置する本体作業機とそれに対して折り畳み自在に連結される延長作業機を備え、延長作業機が本体作業機の本体ロータに連結可能な延長ロータを覆う延長エプロンとその後方に揺動自在に連結される延長レベラを有する折り畳み作業機において、延長レベラが畦等から外力を受けて延長エプロンに対して回転したときに、延長レベラを回転前の状態に復帰させる。【解決手段】延長作業機7の本体作業機2との連結状態のときに、延長レベラ11を本体レベラ6の揺動に連動させて揺動自在とする。延長作業機7が折り畳み状態にあり、延長レベラ11が外力を受けたときに延長エプロン5に対して回転可能とする。延長レベラ11が本体レベラ6に連動し得る状態となる側へ延長レベラ11を直接、もしくは間接的に付勢する付勢部材23を備える。【選択図】図1
