PROBLEM TO BE SOLVED: To provide a junction unit for a farm working machine, with a hooking member hardly coming off a hitch pin.SOLUTION: The junction unit includes: a junction frame 41 to be connected to a three-point-link unit 91 provided in the rear part of a tractor 90 a hanger hook 45 provided on the center top in the cross direction of the tractor engagement plates 49 set on both sides of the width direction of a junction frame 41 therebelow, connected with the three-point-link unit 91 and each having a fit hole with the hitch pin 26 of a tilling working machine 1 fittable into/detachable from and a hooking member 55 having an engagement recessed part engageable with the hitch pin 26 provided turnably and vertically on the flank, wherein the engagement recessed part has an opening on one side of the turning direction of the hook member on the tip side of the hooking member 55, and the tangential line S of the inner face flank of the engagement recessed part is formed as a tapered slope tilted toward the tip side of the hooking member 55 as going from the one side of the turning direction of the hooking member 55 to the other side.COPYRIGHT: (C)2011,JPO&INPIT【課題】フック部材がヒッチピンから外れ難くい農作業機の連結装置を提供する。【解決手段】 トラクタ90後部に設けられた三点リンク連結機構91に連結される連結枠41と、このトラクタ幅方向中央上部に設けられたハンガーフック45と、これより下方の連結枠41の幅方向両側に配設されて三点リンク連結機構91に連結され、耕耘作業機1のヒッチピン26が嵌合・離脱可能な嵌合孔を有した係合プレート49と、この側面に上下方向に回動自在に設けられヒッチピン26を係止可能な係合凹部を有したフック部材55を備え、係合凹部は、フック部材55の先端側のフック部材回動方向一方側に開口部を有し、係合凹部の内面側部の接線Sは、フック部材55の回動方向一方側から他方側に進むに従ってフック部材55の先端側に傾くテーパ状の傾斜面として形成される。【選択図】 図1
