PROBLEM TO BE SOLVED: To make an extension leveler freely rotatable against an extension apron according to an external force that the extension leveler receives by itself in a folded state of the extension implement in a folding implement which is equipped with a body implement positioned behind a tractor and an extension implement foldably connected to the body implement and has the extension apron and the extension leveler shakably connected to the rear of the extension apron.SOLUTION: The extension leveler 11 is equipped with a connection member that shakes the extension leveler 11 in cooperation with the shake of a body leveler 6 in a state in which the extension implement 7 is connected to the body implement 2. The connection member is equipped with a part to be fastened for fastening the extension leveler 11 to the body leveler 6 in connection of the extension implement 7 to the body implement 2 and a fastening part for fastening the extension leveler 11 to the extension apron 10 in folding of the extension implement 7. When the extension leveler 11 receives an external force in any shake direction in folding of the extension implement 7, the fastening part is disengaged from the extension apron 10.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、延長作業機の折り畳み状態で、延長レベラを自らが受ける外力に応じて延長エプロンに対して自由に回転自在にする。【解決手段】延長レベラ11に、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の揺動に連係させて揺動させる連係部材を設置する。連係部材に、延長作業機7の本体作業機2への連結時に、延長レベラ11と本体レベラ6が係止する被係止部と、延長作業機7の折り畳み時に延長レベラ11と延長エプロン10に係止する係止部を与え、延長作業機7の折り畳み時に延長レベラ11がいずれかの揺動の向きに外力を受けたときに、係止部が延長エプロン10から離脱可能にする。【選択図】図1
