PROBLEM TO BE SOLVED: To improve operability, when the lowering limit position of an implement is changed into an arbitrary working height position or a moving or transporting height position.SOLUTION: The implement lowering limiting structure of the working vehicle, which is formed so that the lowering operation of the implement 5 connected liftably to a travel vehicle body 1 via a link mechanism 4 is performed by the self weight of the implement 5, and is equipped with a lowering limiting means 45 for limiting the self-weight lowering of the implement 5 on the lowering operation of the implement 5 and with a lowering limit-setting means 46 for changing a lowering limiting position for limiting the self weight lowering of the implement 5 with the lowering control means 45, on the basis of the operation of an operation tool 40, is characterized to have a receiving tool 41 for receiving a contact member 44 to limit the self-weight lowering of the implement 5 from a height position on an upper limit side, and an auxiliary operation tool 43 for changing the position of the receiving tool 41 to a receiving position (a), capable of receiving the contact member 44 or to an escape position (b) which is incapable of receiving the contact member 44.COPYRIGHT: (C)2009,JPO&INPIT【課題】 作業装置の下降限界位置を、任意の作業高さ位置と移動・輸送用の高さ位置とに変更する際の操作性の向上を図れるようにする。【解決手段】 走行車体1にリンク機構4を介して昇降可能に連結した作業装置5の下降操作を作業装置5の自重で行うように構成し、作業装置5の下降操作時に作業装置5の自重下降を規制する下降規制手段45と、操作具40の操作に基づいて、下降規制手段45が作業装置5の自重下降を規制する下降限界位置を変更する下限設定手段46を備えてある作業車の作業装置下降規制構造において、接当部材44を受け止めることにより上限側の高さ位置からの作業装置5の自重下降を規制する受止具41と、受止具41を、接当部材44の受け止めが可能な受止位置aと、接当部材44の受け止めが不能な退避位置bとにわたって、変位操作する補助操作具43とを装備してある。【選択図】 図4
