PROBLEM TO BE SOLVED: To smoothly perform the engagement connection of engagement pins at a sulky working vehicle side and engagement members at a working device side by a simple constitution, and to surely keep their engagement connection states.SOLUTION: There are formed, at left and right engagement members 45 at a working device side, first recesses 45A which are recessed frontward from rear ends of the engagement members, second recesses 45B which are recessed upward at front end points of the first recesses 45A, and third recesses 45C which are recessed downward at the front end points of the first recesses 45A at depths shallower than the second recesses 45B. First engagement pins 64 which are arranged at free ends of left and right oscillating links 24 of a vehicle body side and oriented in left and right directions are fit in the first recesses 45A, and abut on the front ends of the first recesses by the forward traveling of left and right front wheels 4 after straddling a working device 21, and after that, the first engagement pins are fit in the second recesses 45A, and abut on upper end edges of the second recesses. Furthermore, the second engagement pins 65 which are connected to the first engagement pins 64 via oscillating arms 63 and oriented in left and right directions are fit in the first recesses 45A, and abut on the front end edges of the fright recesses.COPYRIGHT: (C)2014,JPO&INPIT【課題】簡単な構成で、乗用作業車側の係合ピンと作業装置側の係合部材との係合連結を円滑に行える上に、それらの係合連結状態での保持を確実に行えるようにする。【解決手段】作業装置側の左右の係合部材45に、それらの後端から前向きに凹入する第1凹部45Aと、第1凹部45Aの前端箇所で上向きに凹入する第2凹部45Bと、第1凹部45Aの前端箇所で第2凹部45Bよりも浅い深さで下向きに凹入する第3凹部45Cとを形成し、左右の前輪4が作業装置21を乗り越えた後の前進走行により、車体側の左右の揺動リンク24の遊端部に備えた左右向きの第1係合ピン64が、第1凹部45Aに係入してその前端縁に当接した後、第2凹部45Bに係入してその上端縁に当接し、かつ、第1係合ピン64に揺動アーム63を介して連結した左右向きの第2係合ピン65が第1凹部45Aに係入してその前端縁に当接するように構成した。【選択図】図4
